Dental Restoration: Retentive Structures and Surface Area
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Questions and Answers

According to the text, what are the six basic tooth preparation principles referred to as?

  • Wassell's Rules
  • Shillingburg's Protocols (correct)
  • Fujimoto's Guidelines
  • Rosenstiel's Recommendations

    • What is the most important factor in providing a homogeneous reduction depth?

  • Ensuring resistance
  • Adding retention grooves
  • Making the preparation in accordance with the anatomical form of the tooth (correct)
  • Increasing the amount of reduction

    • What type of margin geometry is generally preferred today and can be applied in almost every indication?

  • Chamfer (correct)
  • Beveled shoulder
  • Shoulder
  • Wide step

    • What is the main disadvantage of the knife-edge application as a finishing line type?

    <p>Overcontoured restoration</p> Signup and view all the answers

    What should be adjusted as supra-gingival as possible to avoid damaging the gingiva?

    <p>Margin level</p> Signup and view all the answers

    What should be prepared as parallel as possible to increase resistance?

    <p>Preparation walls</p> Signup and view all the answers

    What may cause fractures and perforations when exposed to functional forces?

    <p>Thin restoration in functional areas</p> Signup and view all the answers

    What brings along some irreversible problems during tooth preparation?

    <p>Irreversible pulpitis</p> Signup and view all the answers

    What type of restoration should have sufficient thickness to resist occlusal forces?

    <p>Crown to be applied</p> Signup and view all the answers

    Which factor is the most important in keeping a restoration in place?

    <p>Retention and resistance</p> Signup and view all the answers

    What is the specified clinically acceptable taper between opposing walls for retention?

    <p>6 degrees</p> Signup and view all the answers

    Why is it necessary to preserve intact tooth tissue during restoration?

    <p>To protect the remaining tooth structure</p> Signup and view all the answers

    What is the primary purpose of providing a retention form with the correct geometric configuration?

    <p>Preventing dislodgement along the long axis of the tooth</p> Signup and view all the answers

    What is the convergence of two opposite-facing external walls of a crown preparation known as?

    <p>Finish line taper</p> Signup and view all the answers

    How can retention be increased in optimum conditions?

    <p>By increasing surface area</p> Signup and view all the answers

    Why is protection of dental tissues essential during restoration?

    <p>To replace lost tooth tissue</p> Signup and view all the answers

    What is an important factor in preventing a restoration from being displaced under occlusal forces?

    <p>Retention and resistance</p> Signup and view all the answers

    What may cause irreversible pulpitis during full crown preparation?

    <p>All of the above</p> Signup and view all the answers

    In which region should more care be taken when preparing anterior teeth?

    <p>Labial surface</p> Signup and view all the answers

    What type of margin level should be preferred in the anterior region where aesthetics is of primary importance?

    <p>Sub-gingival</p> Signup and view all the answers

    What cases would require the use of sub-gingival margin level in tooth preparation?

    <p>When additional retention and/or resistance is needed</p> Signup and view all the answers

    What tool can be used as the most important reference for controlling the depth of cut during anterior tooth preparation?

    <p>Bur diameter</p> Signup and view all the answers

    What is extremely important when performing the proximal aspect preparation?

    <p>Using a thin flame bur to remove a thin enamel layer</p> Signup and view all the answers

    How should margin preparation on the palatal or lingual surface be carried out?

    <p>With the axis of the bur parallel to the axis of the tooth</p> Signup and view all the answers

    What should be done at the gingival or subgingival level to provide aesthetics in the anterior region?

    <p>Tooth preparation should be carried out at these levels</p> Signup and view all the answers

    When preparing the proximal surface, how far should it be carried out from the non-functional tubercle?

    <p>1 mm</p> Signup and view all the answers

    What should be used to protect the tooth in contact while preparing the proximal surface?

    <p>Both a and b</p> Signup and view all the answers

    What should be done to the margin edges during the preparations on the buccal and lingual/palatal surfaces?

    <p>Lowered to the gingival level</p> Signup and view all the answers

    Why is it important to prepare a tooth in accordance with the form of the central fossa and tubercle crests?

    <p>To increase the chance of success</p> Signup and view all the answers

    What will happen if the occlusal surface of an already short tooth is prepared straightly to ensure adequate restoration?

    <p>Preparation will fail</p> Signup and view all the answers

    What should be used to carry out the preparation without damaging the tooth in contact while preparing the proximal surface?

    <p>1 mm diameter bur</p> Signup and view all the answers

    What increase will occur if a preparation is made in accordance with the form of the central fossa and tubercle crests?

    <p>Lengths of buccal and lingual walls will increase</p> Signup and view all the answers

    What will happen if the margin edges are not lowered to the gingival level during preparations on buccal and lingual/palatal surfaces?

    <p>Restoration will fail</p> Signup and view all the answers

    What is the specified clinically acceptable taper between opposing walls for retention?

    <p>6 degrees</p> Signup and view all the answers

    How can retention be increased in optimum conditions?

    <p>By increasing the tooth preparation surface area</p> Signup and view all the answers

    What should be done at the gingival or subgingival level to provide aesthetics in the anterior region?

    <p>Maintain the margin edges at the gingival level</p> Signup and view all the answers

    What may cause irreversible pulpitis during full crown preparation?

    <p>Inadequate preparation of a functional tubercle</p> Signup and view all the answers

    What is the primary purpose of providing a retention form with the correct geometric configuration?

    <p>To prevent restoration dislocation by horizontal forces</p> Signup and view all the answers

    What will happen if the margin edges are not lowered to the gingival level during preparations on buccal and lingual/palatal surfaces?

    <p>The restoration will be more susceptible to plaque accumulation</p> Signup and view all the answers

    What brings along some irreversible problems during tooth preparation?

    <p>Iatrogenic damage to an adjacent tooth</p> Signup and view all the answers

    Why is it necessary to preserve intact tooth tissue during restoration?

    <p>To protect the remaining tooth structure and adjacent structures</p> Signup and view all the answers

    Which factor is the primary purpose of providing a retention form with the correct geometric configuration?

    <p>Preventing displacement under occlusal forces</p> Signup and view all the answers

    What is the convergence of two opposite-facing external walls of a crown preparation known as?

    <p>Taper</p> Signup and view all the answers

    Why is protection of dental tissues essential during restoration?

    <p>To preserve intact tooth tissue</p> Signup and view all the answers

    What type of margin level should be preferred in the anterior region where aesthetics is of primary importance?

    <p>Supra-gingival margin level</p> Signup and view all the answers

    What should be used to carry out the preparation without damaging the tooth in contact while preparing the proximal surface?

    <p>Protective dental tissues</p> Signup and view all the answers

    What will happen if the margin edges are not lowered to the gingival level during preparations on buccal and lingual/palatal surfaces?

    <p>Aesthetics will be compromised</p> Signup and view all the answers

    What should be prepared as parallel as possible to increase resistance?

    <p>External walls of a crown preparation</p> Signup and view all the answers

    What is the purpose of adding retentive grooves to a restoration?

    <p>To increase the resistance of the restoration</p> Signup and view all the answers

    What type of margin geometry is generally preferred today and can be applied in almost every indication?

    <p>Chamfer</p> Signup and view all the answers

    Why should maximum attention be paid to the protection of periodontal tissues during tooth preparation?

    <p>To avoid various problems caused by damaged periodontal tissues</p> Signup and view all the answers

    What is the main disadvantage of the knife-edge application as a finishing line type?

    <p>Overcontoured restoration</p> Signup and view all the answers

    Why is it important to prepare the occlusal surface of a tooth in accordance with its anatomical form?

    <p>To provide sufficient space for restoration</p> Signup and view all the answers

    What should be adjusted as supra-gingival as possible to avoid damaging the gingiva?

    <p>Margin level</p> Signup and view all the answers

    What is the purpose of applying a wide bevel to the palatal tubercle slopes of maxillary teeth and the buccal tubercle slopes of mandibular teeth?

    <p>To increase the structural strength of the whole preparation</p> Signup and view all the answers

    What should be done to increase retention in optimum conditions?

    <p>Add retentive grooves parallel to each other</p> Signup and view all the answers

    What is the primary reason for taking particular care to prevent injuries during full crown preparation?

    <p>To prevent direct pulp perforation and irreversible pulpitis</p> Signup and view all the answers

    In which region should more care be taken when preparing anterior teeth?

    <p>Anterior regions which are of primary aesthetic importance</p> Signup and view all the answers

    What is the most important reference tool for controlling the depth of cut during anterior tooth preparation?

    <p>Diameter of the bur</p> Signup and view all the answers

    In which cases should the sub-gingival margin level be preferred in tooth preparation?

    <p>When additional retention and resistance is needed</p> Signup and view all the answers

    What type of margin geometry is generally preferred in areas with no aesthetic concern?

    <p>Supra-gingival margin</p> Signup and view all the answers

    What should be used to protect the cingulum during the lingual aspect preparation?

    <p>Ball bur</p> Signup and view all the answers

    What is extremely important when performing the proximal aspect preparation?

    <p>Parallel alignment of the bur with the tooth axis</p> Signup and view all the answers

    What should be done at the gingival or subgingival level to provide aesthetics in the anterior region?

    <p>$1.5$ mm preparation from the incisal edge and $2$ mm shortening from labial surface</p> Signup and view all the answers

    What is the primary purpose of preparing the occlusal surface of an already short tooth in accordance with the form of the central fossa and tubercle crests?

    <p>To ensure adequate restoration without further shortening the preparation</p> Signup and view all the answers

    What is the specified clinical acceptable taper between opposing walls for retention?

    <p>1 mm</p> Signup and view all the answers

    Why should the margin edges be lowered to the gingival level during preparations on buccal and lingual/palatal surfaces?

    <p>To provide aesthetics in the anterior region</p> Signup and view all the answers

    What is important when performing the proximal aspect preparation?

    <p>Using matrix tape to protect the tooth in contact</p> Signup and view all the answers

    What will happen if a restoration is displaced under occlusal forces?

    <p>Failures will occur</p> Signup and view all the answers

    What brings along some irreversible problems during tooth preparation?

    <p>Preparing a tooth not in accordance with the form of the central fossa and tubercle crests</p> Signup and view all the answers

    What is necessary to preserve during restoration?

    <p>Intact tooth tissue</p> Signup and view all the answers

    How can retention be increased in optimum conditions?

    <p>By providing a retention form with the correct geometric configuration</p> Signup and view all the answers

    What are the consequences of tooth loss that determine the need for tooth preparation?

    <p>Functional and aesthetic problems, loss of alveolar bone, drifting of adjacent teeth, and over-eruption of opposing teeth.</p> Signup and view all the answers

    What are the space requirements, marginal configurations, and margin placements recommended for different restorations and materials?

    <p>The space requirements, marginal configurations, and margin placements recommended depend on the specific restorations and materials being used.</p> Signup and view all the answers

    What are the resistance and retention forms of tooth preparation?

    <p>The resistance and retention forms of tooth preparation refer to the design and shape of the prepared tooth that enhance the retention and resistance of the restoration.</p> Signup and view all the answers

    What are the most common causes of failure related to tooth preparation techniques?

    <p>Inadequate resistance and retention forms, improper margin placement, and excessive removal of tooth structure.</p> Signup and view all the answers

    What is the prosthetic protocol utilizing the six basic tooth preparation principles of Shillingburg aimed at achieving?

    <p>Improving successful, aesthetic, and biological-based dental outcomes for the existing patient base.</p> Signup and view all the answers

    What are the clinical instruments and equipment armamentarium available to aid efficient and predictable tooth preparation?

    <p>Various instruments and equipment such as burs, handpieces, articulating paper, and articulating forceps.</p> Signup and view all the answers

    What is the specified clinically acceptable taper between opposing walls for retention?

    <p>5 to 10 degrees.</p> Signup and view all the answers

    What is the primary purpose of applying a wide bevel to the palatal tubercle slopes of maxillary teeth and the buccal tubercle slopes of mandibular teeth?

    <p>To provide mechanical resistance and retention for the restoration.</p> Signup and view all the answers

    What is the convergence of two opposite-facing external walls of a crown preparation known as?

    <p>Taper</p> Signup and view all the answers

    What is the specified clinically acceptable taper between opposing walls for retention?

    <p>4-10 degrees</p> Signup and view all the answers

    What type of margin geometry is generally preferred today and can be applied in almost every indication?

    <p>Chamfer</p> Signup and view all the answers

    What is extremely important when performing the proximal aspect preparation?

    <p>Parallelism</p> Signup and view all the answers

    What type of restoration should have sufficient thickness to resist occlusal forces?

    <p>Full crown restoration</p> Signup and view all the answers

    What brings along some irreversible problems during tooth preparation?

    <p>Pulpal injuries</p> Signup and view all the answers

    What may cause fractures and perforations when exposed to functional forces?

    <p>Thin restoration</p> Signup and view all the answers

    What is the main disadvantage of the knife-edge application as a finishing line type?

    <p>Overcontouring</p> Signup and view all the answers

    What is the convergence of two opposite-facing external walls of a crown preparation known as?

    <p>Finish Line Taper</p> Signup and view all the answers

    What is the specified clinically acceptable taper between opposing walls for retention?

    <p>6 degrees</p> Signup and view all the answers

    What is the primary purpose of providing a retention form with the correct geometric configuration?

    <p>To prevent the restoration from being dislodged along the long axis of the tooth or entryway of the restoration.</p> Signup and view all the answers

    What is the most important factor in providing a homogeneous reduction depth?

    <p>Surface area</p> Signup and view all the answers

    What tool can be used as the most important reference for controlling the depth of cut during anterior tooth preparation?

    <p>Diamond bur</p> Signup and view all the answers

    What should be adjusted as supra-gingival as possible to avoid damaging the gingiva?

    <p>Finish Line</p> Signup and view all the answers

    Why should maximum attention be paid to the protection of periodontal tissues during tooth preparation?

    <p>To prevent iatrogenic damage and subsequent susceptibility to plaque accumulation and caries.</p> Signup and view all the answers

    When preparing the proximal surface, how far should it be carried out from the non-functional tubercle?

    <p>To the proximal enamel of the tooth</p> Signup and view all the answers

    What are the six basic tooth preparation principles referred to as?

    <p>The six basic tooth preparation principles are: protection of dental tissues, prevention of irreversible pulpitis, provision of aesthetics, maintenance of tooth structure and integrity, provision of retention and resistance, and achievement of structural durability.</p> Signup and view all the answers

    What is the specified clinical acceptable taper between opposing walls for retention?

    <p>The specified clinical acceptable taper between opposing walls for retention is 4 to 20 degrees.</p> Signup and view all the answers

    What brings along some irreversible problems during tooth preparation?

    <p>Excessive heat, pressure, chemical irritation, microorganisms, and direct pulp perforation can cause irreversible problems during tooth preparation.</p> Signup and view all the answers

    Why is it necessary to preserve intact tooth tissue during restoration?

    <p>Preserving intact tooth tissue during restoration is important to maintain the tooth's strength and integrity, as well as to minimize the risk of irreversible pulpitis.</p> Signup and view all the answers

    What is the primary purpose of providing a retention form with the correct geometric configuration?

    <p>The primary purpose of providing a retention form with the correct geometric configuration is to prevent displacement of the restoration under occlusal forces.</p> Signup and view all the answers

    In which cases should the sub-gingival margin level be preferred in tooth preparation?

    <p>The sub-gingival margin level should be preferred in cases where dental caries extend into the subgingival area, the proximal contact area extends apically to the gingival crest, additional retention and/or resistance is needed, and the border of an aesthetic restoration should be hidden behind the labiogingival crest.</p> Signup and view all the answers

    What may cause fractures and perforations when exposed to functional forces?

    <p>Fractures and perforations may occur when exposed to functional forces due to inadequate tooth preparation, excessive heat, and pressure during the procedure.</p> Signup and view all the answers

    What should be used to protect the cingulum during the lingual aspect preparation?

    <p>A ball bur should be used to protect the cingulum during the lingual aspect preparation.</p> Signup and view all the answers

    What should be used to protect the tooth in contact while preparing the proximal surface?

    <p>Matrix tape</p> Signup and view all the answers

    Why should maximum attention be paid to the protection of periodontal tissues during tooth preparation?

    <p>To avoid damage to the surrounding tissues and ensure successful restoration</p> Signup and view all the answers

    What is the main disadvantage of preparing the occlusal surface of an already short tooth straightly to ensure adequate restoration?

    <p>It will further shorten the preparation and result in failures</p> Signup and view all the answers

    What is the primary reason for taking particular care to prevent injuries during full crown preparation?

    <p>To prevent irreversible problems and ensure the success of the preparation</p> Signup and view all the answers

    What is the convergence of two opposite-facing external walls of a crown preparation known as?

    <p>Taper</p> Signup and view all the answers

    What should be used to protect the cingulum during the lingual aspect preparation?

    <p>Matrix tape</p> Signup and view all the answers

    What is the purpose of applying a wide bevel to the palatal tubercle slopes of maxillary teeth and the buccal tubercle slopes of mandibular teeth?

    <p>To increase the lengths of the buccal and lingual walls and the chance of success</p> Signup and view all the answers

    What should be adjusted as supra-gingival as possible to avoid damaging the gingiva?

    <p>Margin edges</p> Signup and view all the answers

    After completion of this course, the student will be able to: List consequences of tooth loss and determine the need for tooth ______

    <p>preparation</p> Signup and view all the answers

    Plan tooth ______ keeping in mind the space requirements, marginal configurations, and margin placements recommended for different restorations and materials

    <p>preparation</p> Signup and view all the answers

    Define resistance and retention forms of tooth ______

    <p>preparation</p> Signup and view all the answers

    Identify the most common causes of failure related to tooth ______ techniques

    <p>preparation</p> Signup and view all the answers

    Describe the clinical instruments and equipment armamentarium that are available to aid efficient and predictable tooth ______

    <p>preparation</p> Signup and view all the answers

    Establish a prosthetic protocol utilizing the six basic tooth ______ principles of Shillingburg to improve successful, aesthetic, and biological-based dental outcomes for the existing patient base

    <p>preparation</p> Signup and view all the answers

    When preparing the proximal surface, it should be carried out without damaging the tooth in contact, using a flame tip or fine fissure ______.

    <p>bur</p> Signup and view all the answers

    The margin edges should be lowered to the ______ level during preparations on the buccal and lingual/palatal surfaces.

    <p>gingival</p> Signup and view all the answers

    Straightly preparing the occlusal surface of an already short tooth to ensure adequate restoration will further shorten the preparation and result in ______.

    <p>failures</p> Signup and view all the answers

    In a preparation made in accordance with the form of the central fossa and tubercle crests, the lengths of the buccal and lingual walls will increase and the chance of ______ will increase.

    <p>success</p> Signup and view all the answers

    The primary purpose of providing a retention form with the correct geometric configuration is to increase ______.

    <p>retention</p> Signup and view all the answers

    The margin edges should be lowered to the gingival level to ensure ______ during preparations on buccal and lingual/palatal surfaces.

    <p>aesthetics</p> Signup and view all the answers

    The preparation form of large teeth is more ______ than the preparation form of small teeth.

    <p>retentive</p> Signup and view all the answers

    Maximum retention occurs in preparations with a single path of insertion and long parallel ______.

    <p>walls</p> Signup and view all the answers

    In order to ensure resistance, the axial walls should be prepared as parallel as possible to increase the ______.

    <p>resistance</p> Signup and view all the answers

    Restoration should have sufficient thickness to resist ______ forces.

    <p>occlusal</p> Signup and view all the answers

    One of the most important measures to increase the structural strength in the occlusal section is to pay attention to functional ______.

    <p>tubercles</p> Signup and view all the answers

    The margin geometry that is generally preferred today and can be applied in almost every indication is ______.

    <p>chamfer</p> Signup and view all the answers

    One of the most important factors for a successful restoration is the tight adaptation of the margins to the preparation finish ______.

    <p>line</p> Signup and view all the answers

    In order not to damage the gingiva, the margin level should be adjusted as supra-gingival as possible, especially in areas that do not require ______.

    <p>aesthetics</p> Signup and view all the answers

    During tooth preparation, maximum attention should be paid to the protection of ______ tissues.

    <p>periodontal</p> Signup and view all the answers

    Pulpal injuries bring along some irreversible ______.

    <p>problems</p> Signup and view all the answers

    The margin geometry that is generally preferred today and can be applied in almost every indication is ______.

    <p>chamfer</p> Signup and view all the answers

    Inadequate preparation may cause mechanical complications (fracture, etc.) in the ______.

    <p>restoration</p> Signup and view all the answers

    The pulp temperature rises during tooth preparation due to the use of different tools and methods. Group I, air turbine, water cooled. Group II, air turbine, ____________.

    <p>dry</p> Signup and view all the answers

    The length of the tooth should be shorter than the length of the bur for controlled cutting. Therefore, the length of the tooth is shortened by ________ mm by making preparations on the incisal edge first.

    <p>2</p> Signup and view all the answers

    In the proximal aspect preparation, in order not to damage the adjacent tooth, a thin flame bur is used to remove a thin enamel layer. It is extremely important that the long axis of the bur is parallel to the long axis of the tooth. The preparation on the lingual aspect is performed with a ball bur in accordance with its ________.

    <p>anatomy</p> Signup and view all the answers

    The preparation on the lingual aspect is performed with a ball bur in accordance with its ________.

    <p>anatomy</p> Signup and view all the answers

    Margin preparation on the palatal or lingual surface should be carried out in a way that protects the cingulum, with the axis of the bur parallel to the axis of the tooth. To provide aesthetics in the anterior region, tooth preparation should be done at the gingival level or at the ________ level.

    <p>subgingival</p> Signup and view all the answers

    The bur diameter can be used as the most important reference tool for controlling the depth of cut. For this purpose, a 1-mm diameter bur can be used for controlled cutting. In order for the preparation to be controlled, the length of the tooth should be shorter than the length of the bur. Therefore, the length of the tooth is shortened by ________ mm by making preparations on the incisal edge first.

    <p>2</p> Signup and view all the answers

    The preparation is started by controlling the depth of reduction from the occlusal surface and with a bur with a diameter of 1 mm. In accordance with the morphological slopes of the tubercles, preparation is made first on the buccal tubercles and then on the lingual/palatal tubercles. It should have sufficient restoration thickness to resist occlusal forces. Although these rates vary according to the type of crown to be applied, in practice it is ideal to prepare ________.

    <p>1</p> Signup and view all the answers

    The bur diameter can be used as the most important reference tool for controlling the depth of cut. For this purpose, a 1-mm diameter bur can be used for controlled cutting. In order for the preparation to be controlled, the length of the tooth should be shorter than the length of the bur. Therefore, the length of the tooth is shortened by ________ mm by making preparations on the incisal edge first.

    <p>2</p> Signup and view all the answers

    The bur diameter can be used as the most important reference tool for controlling the depth of cut. For this purpose, a 1-mm diameter bur can be used for controlled cutting. In order for the preparation to be controlled, the length of the tooth should be shorter than the length of the bur. Therefore, the length of the tooth is shortened by ________ mm by making preparations on the incisal edge first.

    <p>2</p> Signup and view all the answers

    The bur diameter can be used as the most important reference tool for controlling the depth of cut. For this purpose, a 1-mm diameter bur can be used for controlled cutting. In order for the preparation to be controlled, the length of the tooth should be shorter than the length of the bur. Therefore, the length of the tooth is shortened by ________ mm by making preparations on the incisal edge first.

    <p>2</p> Signup and view all the answers

    The bur diameter can be used as the most important reference tool for controlling the depth of cut. For this purpose, a 1-mm diameter bur can be used for controlled cutting. In order for the preparation to be controlled, the length of the tooth should be shorter than the length of the bur. Therefore, the length of the tooth is shortened by ________ mm by making preparations on the incisal edge first.

    <p>2</p> Signup and view all the answers

    The bur diameter can be used as the most important reference tool for controlling the depth of cut. For this purpose, a 1-mm diameter bur can be used for controlled cutting. In order for the preparation to be controlled, the length of the tooth should be shorter than the length of the bur. Therefore, the length of the tooth is shortened by ________ mm by making preparations on the incisal edge first.

    <p>2</p> Signup and view all the answers

    In order to achieve success in fixed prosthetic restorations, it is necessary to make an optimum tooth preparation that is most suitable biologically, mechanically, and ______.

    <p>aesthetically</p> Signup and view all the answers

    Retention is the factor that prevents the restoration from being dislodged along the long axis of the tooth or entryway of the restoration. Resistance prevents the restoration from being displaced by horizontal forces and prevents the restoration from moving under ______ forces.

    <p>occlusal</p> Signup and view all the answers

    The most important factor in increasing retention is ______ area.

    <p>surface</p> Signup and view all the answers

    The clinically acceptable taper is specified as 6 degrees between opposing walls. It is difficult to prepare with perfectly parallel walls and without ______.

    <p>undercuts</p> Signup and view all the answers

    The diamond bur held parallel to the entrance path of the preparation creates an angle of 2-3 degrees in the area. The three-degree slopes of the opposing surfaces create a 6-degree slope in total, which is sufficient for optimum preparation. Another important factor in increasing retention is ______ area.

    <p>surface</p> Signup and view all the answers

    The preservation of the adjacent tooth structure is another issue that should be examined under this heading. Iatrogenic damage to an adjacent tooth is a common error in dentistry. No matter how carefully the damaged proximal tooth area is polished, it will be more susceptible to plaque accumulation and therefore to ______ than normal.

    <p>caries</p> Signup and view all the answers

    For the restoration to achieve its purpose, it must stand firmly in the oral cavity. No single cement can resist the dislocation of the restoration on its own. The most important factor that keeps a restoration in place is to provide ______ and resistance.

    <p>retention</p> Signup and view all the answers

    Teeth are 1.5 to 2 mm wider at the contact area than at the cementoenamel junction. Therefore, a thin, tapered diamond can be passed through the interproximal contact area while leaving a slight “lip” or “fin” of enamel without resulting in excessive tooth reduction or necessitating undesirable angulation of the rotary instrument. This is important for protection of the ______ structures.

    <p>adjacent</p> Signup and view all the answers

    Restoration should not only replace lost tooth tissue; It should also protect the remaining tooth structure. In preparing for a successful restoration, intact tooth tissue should be preserved as much as possible. For convenience and efficiency, the entire tooth surface should not be prepared; Unnecessary preparation should be avoided. Within the framework of this basic view (minimally invasive), partial crown applications should also be considered where necessary. Apart from this, it is a very big mistake to make insufficient tooth preparation in order to protect the tooth structure. For example, inadequate preparation of a functional tubercle in a molar tooth preparation may result in a fracture of the restorative material and subsequent clinical failure. The preservation of the adjacent tooth structure is another issue that should be examined under this heading. Iatrogenic damage to an adjacent tooth is a common error in dentistry. No matter how carefully the damaged proximal tooth area is polished, it will be more susceptible to plaque accumulation and therefore to ______ than normal.

    <p>caries</p> Signup and view all the answers

    To achieve this optimum preparation, tooth preparation must be done by considering certain basic principles stated by Shillingburg. These are: 1. Protection of dental tissues 2. Ensuring retention and resistance 3. Ensuring structural strength 4. Ensuring marginal fit 5. Protection of pulp and periodontal tissues 6. Providing ______.

    <p>aesthetics</p> Signup and view all the answers

    Retention is the factor that prevents the restoration from being dislodged along the long axis of the tooth or entryway of the restoration. Resistance prevents the restoration from being displaced by ______ forces and prevents the restoration from moving under occlusal forces.

    <p>horizontal</p> Signup and view all the answers

    Protection should be used to protect the ______ enamel of the tooth that is being prepared for the protection of the adjacent structures.

    <p>proximal</p> Signup and view all the answers

    Study Notes

    Tooth Preparation Principles

    • The six basic tooth preparation principles are referred to as biological, aesthetic, functional, structural, retention, and periodontal.

    Retention and Resistance

    • The most important factor in providing a homogeneous reduction depth is the use of a uniform cutting instrument.
    • The convergence of two opposite-facing external walls of a crown preparation is known as taper.
    • The specified clinically acceptable taper between opposing walls for retention is 12-15 degrees.
    • Retention can be increased in optimum conditions by providing a retention form with the correct geometric configuration.
    • Resisting occlusal forces requires a sufficient thickness of the restoration.

    Margin Preparation

    • The most preferred type of margin geometry is chamfer, which can be applied in almost every indication.
    • The main disadvantage of the knife-edge application as a finishing line type is that it can cause fractures and perforations when exposed to functional forces.
    • Margin preparation on the palatal or lingual surface should be carried out with a rounded or chamfered margin edge.
    • The margin edges should be lowered to the gingival level during preparations on buccal and lingual/palatal surfaces to prevent aesthetics problems.

    Proximal Aspect Preparation

    • When preparing the proximal surface, it should be carried out 1-2 mm from the non-functional tubercle.
    • The most important reference tool for controlling the depth of cut during anterior tooth preparation is the proximal separator.
    • Protection of the tooth in contact is essential during preparation, and a proximal separator should be used.

    Aesthetics

    • In the anterior region, where aesthetics is of primary importance, a sub-gingival margin level should be preferred.
    • The palatal or lingual surface should be prepared at the gingival or sub-gingival level to provide aesthetics.
    • The purpose of applying a wide bevel to the palatal tubercle slopes of maxillary teeth and the buccal tubercle slopes of mandibular teeth is to provide aesthetics.

    Tooth Preparation Consequences

    • Tooth loss determines the need for tooth preparation.
    • Irreversible problems can occur during tooth preparation, such as pulpitis, fractures, and perforations.
    • Failure of a restoration can occur due to inadequate tooth preparation techniques.

    Clinical Instruments and Equipment

    • The clinical instruments and equipment armamentarium available to aid efficient and predictable tooth preparation includes diamond burs, carbide burs, and proximal separators.

    Prosthetic Protocol

    • The prosthetic protocol utilizing the six basic tooth preparation principles of Shillingburg is aimed at achieving a functional and aesthetically pleasing restoration.

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    Related Documents

    CS2-2 General Principles of Tooth Preparation PDF 2023

    Description

    Learn about the influence of tooth size and retentive structures on the preparation form and surface area for dental cementation. Understand the importance of adding retentive grooves to dental restorations for maximum retention.

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