Class 1 Cavity Preparation Flashcards
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Questions and Answers

What is a Class 1 restoration?

Pits, fissures, and occlusal surfaces of posterior teeth.

What is essential for all margins when preparing a Class I prep?

Make sure all margins are caries-free.

What are indications for a Class 1 restoration?

Caries on the occlusal, pits, or fissures of posterior teeth and defective restoration.

What are four advantages of resin-based composites (RBC)?

<p>Esthetics, no mercury in composition, thermally non-conductive, conservation of tooth structure.</p> Signup and view all the answers

What are the two options for materials for restorations? What is the difference?

<p>RBC and Amalgam; RBC is more esthetically pleasing than amalgam.</p> Signup and view all the answers

What factors affect the long-term success of RBC restorations?

<p>Cavity size, tooth position/type, location of occlusal contacts, patient and dentist commitment, and caries risk.</p> Signup and view all the answers

Since our parents' time, how have posterior resin composite restorations improved?

<p>Improved with annual failure rates of 1.8% at 5 years and 2.4% after 10 years of service.</p> Signup and view all the answers

What should be kept in mind when considering RBC?

<p>Technique sensitivity, wear resistance, field isolation, polymerization shrinkage, post-op sensitivity, marginal discoloration, microleakage, and fractures.</p> Signup and view all the answers

What are limitations of RBC restorations?

<p>High caries risk patients, poor field isolation, replacement of supporting cusps, and large restorations in patients with significant parafunction.</p> Signup and view all the answers

What is important regarding shape for RBC restorations?

<p>Restore to proper anatomy.</p> Signup and view all the answers

What are three considerations a clinician should keep in mind for clinical circumstances?

<p>Adequate isolation, preservation of sound tooth structure, treatment should commence only after addressing etiologic factors.</p> Signup and view all the answers

What is the step-by-step operative technique for Class 1 RBC preparation?

<p>Case selection, check occlusion, clean the area, select a composite system and shade, rubber dam isolation, preparation.</p> Signup and view all the answers

What should the wall orientation have in a Class 1 didactic preparation?

<p>Smooth walls, slightly convergent occlusally, D/M walls slightly divergent, rounded internal angles.</p> Signup and view all the answers

What is the shape of a didactic Class 1 upper premolar?

<p>Bow.</p> Signup and view all the answers

What is the shape of a didactic Class 1 lower first premolar?

<p>Snake eyes.</p> Signup and view all the answers

What is the shape of a didactic Class 1 lower second premolar?

<p>Glass slipper.</p> Signup and view all the answers

What is the shape of a didactic Class 1 lower first molar?

<p>Occlusal surface, buccal pits, and lingual grooves.</p> Signup and view all the answers

What is the shape of a didactic Class 1 lower second molar?

<p>Not provided.</p> Signup and view all the answers

What is the shape of a didactic Class 1 upper first molar?

<p>Shape depends on caries.</p> Signup and view all the answers

What is the shape of a didactic Class 1 upper incisor?

<p>Lingual surface or grooves/pits.</p> Signup and view all the answers

What is the difference in the outline form between amalgam and composite restorations?

<p>Not provided.</p> Signup and view all the answers

What is the difference in the pulpal depth between amalgam and composite restorations?

<p>Amalgam requires a flat pulpal floor, 1.5-2mm deep; RBC requires just faulty removal with uneven or rough walls.</p> Signup and view all the answers

What is the difference in the primary retention form between amalgam and composite restorations?

<p>Amalgam converges occlusally; RBC has none as roughness aids in bonding.</p> Signup and view all the answers

What is the difference in the secondary retention form between amalgam and composite restorations?

<p>Amalgam uses grooves, slots, locks, pins; RBC relies on bonding and grooves for large preparations.</p> Signup and view all the answers

What is the difference in the resistance form between amalgam and composite restorations?

<p>Amalgam has flat floors, rounded angles, and box-shaped; RBC has the same for large preparations but none for small to moderate preparations.</p> Signup and view all the answers

What is the difference in the base indications form between amalgam and composite restorations?

<p>Amalgam requires 2mm between pulp and amalgam; RBC has none.</p> Signup and view all the answers

What is the difference in the linear indications form between amalgam and composite restorations?

<p>Amalgam requires Ca(OH)2 over direct or indirect pulp caps; RBC may use RMGI liner on root surface.</p> Signup and view all the answers

What is the difference in the sealer form between amalgam and composite restorations?

<p>Amalgam uses GLUMA desensitizer when not bonding; RBC is sealed by the bonding system used.</p> Signup and view all the answers

What are the indicating lines on the perio probe used when measuring out didactic preps?

<p>Not provided.</p> Signup and view all the answers

What instrument should be used to create the isthmus?

<p>Hatchet (1, 1.5, 2); if too much is used, a Brendall.</p> Signup and view all the answers

Study Notes

Class 1 Cavity Preparation Overview

  • Class 1 preparations involve treating pits, fissures, and occlusal surfaces of posterior teeth.
  • Treatment may reveal deeper decay than initially visible.

Margin Preparation

  • Ensure all margins are free of caries, which can be either active or inactive.

Indications for Class 1 Restoration

  • Caries found on occlusal surfaces, pits, and fissures of posterior teeth necessitate restoration.
  • Restoration should also be considered if the existing one is defective.

Advantages of Resin-Based Composites (RBC)

  • Aesthetic appeal with no mercury in composition.
  • Thermally non-conductive, reducing sensitivity.
  • Encourages conservation of tooth structure due to adherence properties.

Restoration Material Options

  • Two main materials: Resin-Based Composites (RBC) and Amalgam.
  • RBC provides better aesthetic results and should only be replaced if truly necessary to preserve tooth structure.

Long-Term Success Factors for RBC

  • Success is influenced by cavity size, tooth type, occlusal contact location, commitment from both patient and dentist, and patient's caries risk.
  • High caries risk and clenching leads to lower restoration survival rates.

Success Rates of Composite Restorations

  • Posterior RBC restorations have improved significantly; with failure rates of 1.8% at 5 years and 2.4% at 10 years.

Considerations for RBC Application

  • Technique sensitivity: Follow proper protocols and timing for material application.
  • Durability varies between RBCs; overly hard materials may wear opposing teeth.
  • Proper isolation from saliva and blood is critical to bond quality.
  • Polymerization shrinkage must be managed properly during application.
  • Post-operative sensitivity may arise from improper etching or heating.
  • Marginal discoloration can occur; quality adhesive application is essential to minimize this issue.
  • Microleakage can result in discoloration linked to shrinkage of the material.
  • Selection of materials affects the likelihood of fractures in restorations.

Limitations of RBC Restorations

  • High caries risk patients may not benefit as much from RBC.
  • Difficulties in achieving adequate field isolation affect bonding success.
  • Significant wear on cusps due to parafunctional habits limits effectiveness.
  • Large restorations may compromise structural integrity.

Importance of Proper Anatomy Restoration

  • Aim to restore proper occlusal and proximal anatomy for functional success.

Clinical Considerations for Treatment

  • Effective isolation techniques are mandatory for composite restorations.
  • Preserve sound tooth structure as much as possible through minimally invasive techniques.
  • Information on etiological factors such as caries and periodontal disease should be addressed before treatment begins.

Step-by-Step Technique for Class 1 RBC Preparation

  • Begin with case selection and identification of techniques.
  • Evaluate the patient's occlusion.
  • Clean the area by removing biofilm, caries, and debris.
  • Choose the appropriate composite system and shade pre-isolation.
  • Implement rubber dam isolation for optimal conditions.
  • Proceed with cavity preparation.

Characteristics in Didactic Class 1 Preparations

  • Wall orientation should feature smooth, slightly converging occlusal walls, slightly diverging mesial/distal walls, and rounded internal angles.
  • Cavosurface must be smooth and free from irregularities.
  • Ensure no unsupported enamel is present in walls.

Shapes of Didactic Class 1 Preparations

  • Upper premolar resembles a "bow."
  • Lower first premolar characterized as "snake eyes."
  • Lower second premolar takes the shape of a "glass slipper."
  • Lower first molar presents with an identifiable occlusal surface, buccal pits, and lingual grooves.
  • Shapes for other molars and incisors depend on caries and anatomical variations.

Differences Between Amalgam and Composite Restorations

  • Pulpal depth for amalgam restorations requires a flat floor of 1.5-2mm; composite allows for rough, non-uniform surfaces.
  • Primary retention form: amalgam requires occlusal convergence; RBC relies on surface roughness for bonding.
  • Secondary retention for amalgam includes grooves and pins; RBC uses adhesive bonding primarily.
  • Resistance forms for amalgam have flat floors and rounded angles; composites have less stringent requirements.
  • Base indications for amalgam suggest 2mm clearance from pulp; RBC has no specific requirements.
  • Both use calcium hydroxide for pulp capping, but RBC may include RMGI liners for specific procedures.
  • Sealing differences: amalgam uses GLUMA desensitizer when not bonding, while RBC relies on the bonding system.

Additional Tools and Methods

  • Use hatchets for isthmus creation when preparing cavities; excess removal can be achieved with brendall instruments.

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Test your knowledge on Class 1 cavity preparations with these flashcards. Each card addresses important concepts, definitions, and guidelines related to Class 1 restorations, providing a deeper understanding of dental procedures. Ideal for dental students and professionals seeking to reinforce their learning.

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