Complete Denture Construction
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Questions and Answers

What is the normal facial angle formed by the two lines passing through the lower edge of the nose (the columella) and the edge of the upper lip?

Approximately 90 degrees

What are the two main muscles that make up the cheeks and lips?

Buccinator (cheeks) and orbicularis oris (lips)

The teeth support the muscles of the cheeks and lips.

True

What is the incisal guidance angle formed by?

<p>The path of the lower central incisor along the palatal surface of the upper central incisor, measured against the horizontal plane</p> Signup and view all the answers

What are the two important considerations for setting the anteriors?

<p>Proper lip support, nasolabial angle, and vermilion border</p> Signup and view all the answers

What does the selection of artificial teeth depend on?

<p>The shape of the upper dental arch</p> Signup and view all the answers

What are the three classifications of face forms according to Leon William?

<p>Square, tapered, ovoid</p> Signup and view all the answers

What does the smile line determine?

<p>The height of the teeth</p> Signup and view all the answers

The selection of teeth should be based on the patient's personality.

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

The colour of the face is more important than the colour of the teeth.

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

What are the main factors affecting setting of upper teeth?

<p>Phonetics, esthetics, and functional requirements</p> Signup and view all the answers

Older individuals often have worn teeth which may appear artificial.

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

Tooth colour naturally darkens with age.

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

What are the three main categories of upper posterior teeth according to Lang?

<p>Anatomical, Non-anatomical, Zero-degree teeth</p> Signup and view all the answers

What are the three types of teeth classified by cusp presence?

<p>Cusp teeth, cusp-less teeth, and hybrid teeth</p> Signup and view all the answers

Cusped teeth are preferred for flat, atrophic mandibular ridges.

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

Cuspless teeth tend to look more natural.

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

Cuspless teeth allow for balanced articulation.

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

Hybrid teeth have a worn appearance.

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

What are the advantages of porcelain teeth?

<p>Hard glazed surface unaffected by abrasive food, colour stability</p> Signup and view all the answers

What are the advantages of acrylic teeth?

<p>Greater resilience, cushioning supporting tissues from occlusal loads, chemically united with the denture base resin</p> Signup and view all the answers

What are the five key determinations for setting artificial teeth?

<p>Labial and buccal contours, occlusal plane, vertical dimension, horizontal relation, and reference lines.</p> Signup and view all the answers

What are the two main types of guides used in setting artificial teeth?

<p>Occlusion rims and biometric guides</p> Signup and view all the answers

What is the function of the articulator in denture construction?

<p>To mount the casts and simulate jaw movements</p> Signup and view all the answers

What is the purpose of the mounted master cast?

<p>The base for tooth setting</p> Signup and view all the answers

What is the function of the benzene burner flame or alcohol torch?

<p>To soften wax for tooth placement</p> Signup and view all the answers

What is the function of the wax knife?

<p>To carve and manipulate wax</p> Signup and view all the answers

What is the function of the lacron carver?

<p>To shape and refine tooth positions</p> Signup and view all the answers

What is the function of the occlusal plane?

<p>To guide the horizontal plane of occlusion</p> Signup and view all the answers

What is the function of the piece of wax?

<p>To secure teeth within the wax rim</p> Signup and view all the answers

What is the function of the ruler?

<p>For measurements and alignment</p> Signup and view all the answers

What is the function of pens in setting artificial teeth?

<p>For marking and labeling</p> Signup and view all the answers

What is the most important tooth to set in the dental arch?

<p>The maxillary canine</p> Signup and view all the answers

The mesio-labial surface of the maxillary canine should have a flat setting.

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

What is the main guideline to follow in setting the opposite side of the dental arch?

<p>Arch symmetry</p> Signup and view all the answers

How do you ensure proper midline alignment?

<p>A ruler perpendicular to the midline, touching the distal surface of the left canine, should intersect the distal surface of the right canine</p> Signup and view all the answers

What are the two important principles to follow for setting the maxillary posterior teeth?

<p>Bonwill Triangle and Circle</p> Signup and view all the answers

What are the three key classifications of maxillary posterior teeth?

<p>Anatomic, Semi-anatomic, and Non-anatomic</p> Signup and view all the answers

Anatomic teeth are recommended for patients with well-developed alveolar ridges.

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

Non-anatomic teeth are best for patients with advanced resorption or a negative ridge.

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

What is the buccal corridor width?

<p>The difference between the visible maxillary dentition width and the inner lip commissure width</p> Signup and view all the answers

Maxillary anterior teeth are positioned labial to the mandibular ridge.

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

Maxillary anterior teeth should be positioned below the occlusal plane.

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

What is the typical incisal guidance angle?

<p>15 degrees</p> Signup and view all the answers

The occlusal plane position for the mandibular anterior teeth is the same as the maxillary anteriors.

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

The arrangement of mandibular posterior teeth follows the maxillary setting.

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

The setting of the mandibular first molar is based on Class II Angle's classification.

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

What are the five key factors that influence balanced occlusion?

<p>Condylar guidance, incisal guidance, cusps, occlusal plane, compensating curves</p> Signup and view all the answers

The incisal guidance angle should be greater than the condylar guidance angle.

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

The occlusal plane is considered fixed and cannot be altered.

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

What are the three types of compensating curves?

<p>Anterio-posterior curve (Spee), lateral curve (Wilson), and cusp angle</p> Signup and view all the answers

The relationship between the incisal guidance angle and the articulator is absolute parallelism.

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

What are the two main differences between natural teeth and complete dentures?

<p>Attachment to supporting structures and movement under occlusal loading</p> Signup and view all the answers

Balancing contact is considered pathological or deflective for natural teeth.

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

Balancing contact is essential to prevent the denture from tipping.

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

Study Notes

Artificial Teeth Selection for Complete Denture Construction

  • Important considerations include the form of dental arches, height of the occlusal plane, orientation of the occlusal plane, vertical and horizontal relations between maxillary and mandibular casts, and normal facial landmarks.
  • Nasolabial angle: Normally approximately 90-100 degrees, formed by lines passing through the lower edge of the nose and the edge of the upper lip.
  • Corners of the mouth: Variations in lip length, thickness, shape, and mobility affect the visibility of upper and lower teeth.
  • Philtrum of the upper lip: Vermilion borders of upper and lower lips vary in length, thickness, shape, and mobility, impacting tooth visibility.
  • Muscle Support: Cheeks and lips (buccinator and orbicularis oris muscles) need support from denture flange. Teeth support these muscles; upper lip rests on upper anterior teeth and lower lip on lower anterior teeth and incisal edges. Proper lip contour achieved by horizontal overlap.

Guidelines from Jaw Relation for Teeth Setting

  • Guidelines include midline, high lip line, and canine lines; anterior occlusal planes should be parallel to interpupillary line; posterior occlusal planes should be parallel to camper's line.
  • Proper lip support, nasolabial angle, and vermilion border assist in selecting appropriate tooth size and placement. Proper incisal show should also be considered; how much of the incisors are visible at rest.
  • Correct tooth size and placement enable proper lip support.
  • Using facial proportions to determine tooth size: The upper six anterior teeth should extend to the corners of the mouth, and the smile line determines the height of the teeth. Cephalic index, and Berry's formula for determining tooth width should be considered.

Selection of Upper Anterior Teeth Criteria

  • Important criteria include appropriate support for the upper lip, occupying the upper anterior arch, and providing space for individualization (rotation or spacing).
  • Utilizing facial proportions for determining tooth size and shape, such as square, tapered, or ovoid. Shape should ideally harmonize with facial features.

Teeth Selection According to Sex and Personality

  • Female teeth are usually more rounded with less angular features;
  • Male teeth are usually more angular.
  • Vigorous individuals prefer larger, squarish teeth; and delicate individuals prefer smaller, symmetrical teeth in a flat plane.

Factors Affecting Setting of Upper Teeth (Aesthetics, Phonetics)

  • Aesthetic requirements include proper tissue support, color, and size, and the amount of upper anterior teeth showing.
  • Speech is affected by tooth position and the contour of the palate. Incisal edges of upper anterior teeth should contact the junction of oral mucosa and the transitional epithelium of the lower lip when smiling and pronouncing "f" and "v".

Horizontal and Vertical Orientation of Anterior Teeth

  • Anteroposterior tooth position is influenced by lip support and relationship between maxilla and mandible.
  • Vertical orientation depends on lip length and mobility. Cervical third of the anterior teeth is often visible (in 50% of adults), lower teeth are generally more visible in older adults. Inclination of anterior teeth is influenced by bone plate inclination (concave or convex facial profile).

Harmony in the General Composition of Anterior Teeth

  • Harmony between incisal show and patient's age. Incisal edges of upper teeth follow the curvature of the lower lip during a smile.
  • Harmony with dental arch form and the residual ridge shape.

Selection of Posterior Teeth

  • Posterior teeth can be classified anatomically, non-anatomically (cuspless), or semi-anatomically, differing in their cusp angles.
  • Occlusal factors to consider include vertical, ruminatory (lateral) mandibular movement patterns, and balanced articulation.
  • Stability factors include cusp design and width, which affects tooth stability in a denture; and aesthetic factors, such as shape and appearance.

Material of Teeth

  • Porcelain teeth have a hard glazed surface, are unaffected by abrasive food, and exhibit excellent color stability. Disadvantages include mechanical retention, brittleness, and thermal expansion differences with the acrylic base.
  • Acrylic teeth offer greater resilience and cushioning to support tissues from occlusal loads.. Disadvantages include tendency to wear down, resulting in loss of vertical dimension.

Arrangement (Setting) of Artificial Teeth

  • Guides for setting involve occlusal rims and determining the buccolingual position of teeth, defining and establishing the occlusal plane and vertical dimension, establishing horizontal relationship between wax rims, using reference lines (midline, high lip line, canine line). Biometric guides improve tooth positioning
  • A sequence of setting artificial teeth: Maxillary anteriors, maxillary posteriors, mandibular anteriors, and mandibular posteriors should follow the similar sequences and symmetry.

Setting of Mandibular Artificial Teeth

  • Mandibular teeth should be positioned on or slightly labial to the mandibular ridge, incisal edges are lingual to the maxillary anterior teeth, slightly above the occlusal plane to produce an overbite. The angle formed by the connection of the incisal edges and the occlusal plane is called the incisal guidance angle (typically 15 degrees)
  • Achieving an equidistance overjet is also critical for symmetry. Teeth should touch on non-working sides, but there shouldn't be any contact between maxillary and mandibular teeth in centric occlusion. This lack of contact is due to overjet.
  • Setting teeth on the mandibular crest should be determined by drawing a line on crest of the ridge and extending it backward to the retromolar region.

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Artificial Teeth Selection for Complete Denture Construction PDF

Description

Explore the essential factors in selecting artificial teeth for complete denture construction. Understand the significance of dental arch forms, occlusal plane orientation, and facial landmarks that influence aesthetics and functionality. This quiz delves into how variations in lip structure and muscle support affect denture design.

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