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Selection of artificial teeth

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Clinical Removable Prosthodontics
Forth Year

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Selection of artificial teeth

  1. 1. Selection of Artificial Teeth Lecture Outline Selection Criteria  Size  Color  Form  Material  Selection Criteria Size  Color  Form  Material  Size of Artificial Teeth .The Mesio-distal dimension .The Bucco-lingual dimension   .The Occluso-gingival dimension  Size of Anterior Teeth :Factors influence selection of the size of anterior teeth Size of the face Size of maxillary arch Maxillary residual ridge contour Skeletal jaw (maxillo-mandibular) relation Vertical distance between the arches -  Size of Anterior Teeth high lip line Teeth visibility with resting lip Teeth to lip relation with phonetic sounds The approximate location of distal surfaces of maxillary canines Size of Posterior Teeth Buccolingual and mesiodistal dimension of artificial posterior teeth less than natural teeth they replace The mesiodistal dimension of posterior teeth is governed by the length and shape of the mandibular ridge Artificial posterior teeth will occupy the distance of mandibular ridge from the distal surface of canine to the anterior border of the retromolar pad
  2. 2. Size of Posterior Teeth A mark on the cast indicate available space for artificial posterior teeth, on the crest of the ridge at the anterior border of the retromolar pad The mold number will represent the total mesiodistal width of the posterior teeth in millimeters Color /Shade of Teeth :Physics of color  .Hue :The quality the which one color is distinguished from another o Chroma: The quality by which a strong color is distinguished from one that is .weak .Value: The quality by which a light color is distinguished from dark color o o Shade Of Anterior Teeth Harmony should exist between the color of the teeth and the color of skin, hair and eyes Color of the teeth must be in harmony with the color of the face Shade guide used should be one from the same manufacturer whose teeth will be used - Shade of Posterior Teeth Should be harmonized with the shade of anterior teeth Shape/Form of Anterior Teeth The shape of the anterior artificial teeth should harmonize with shape of the patient’s face when viewed from frontal, profile and incisal aspects :(Shape of the face (Frontal aspect 0square, tapering, ovoid and combination Shape/Form of Anterior Teeth  Frontal outline; follows the form of the face (square, taper, ovoid or  (combinations (Profile outline; follows the face profile ( convex, flat 0 Age of patient; attrition facets may lead to the loss of well defined outline of the 0 teeth Sex of patient; well defined edges for the male and rounded edges for female 0 patients Shape/Form of Posterior Teeth Posterior teeth are manufctured in with various forms ˚Most commonly used cusp inclines are 33˚ , 20˚ and 0 The cuspal inclination is measured as the angle formed by the incline of the mesiobuccal cusp of the lower first molar with the horizontal plane Shape/Form of Posterior Teeth :Anatomic Teeth  Simulate the natural tooth form, that provide more esthetic appearance -
  3. 3. Offer the maximum opportunity for fully balanced occlusion More esthetic More masticatory efficiency Shape/Form of Posterior Teeth :Anatomic Teeth :Disadvantages  Need eccentric records and required adjustable articulator Lateral torque in eccentric occlusal contacts and higher chance for premature traumatic contacts Difficulty in relining and rebasing Shape/Form of Posterior Teeth :Semi-anatomic (functional) teeth  ˚Cusp inclines are less than 30˚ in general, usually 20 Wider buccoligually compared with anatomic teeth Decreased lateral forces :Disadvantages  Esthetic, chewing efficiency Shape/Form of Posterior Teeth :(Non-anatomic (0˚, cuspless, flat, rational and non-cusp 0 Used in abnormal ridge relation, extremely resorbed ridges and patients with neuromascular disaeses Adapt easily to class II and III jaw relations Patient accommodate easily Simple technique and easier relining and rebasing process Shape/Form of Posterior Teeth Non-anatomic  :Disadvantages  Less esthetic, less masticatory efficiency More vertical forces to underlying tissues :Indications  Reduced ridges Knife-edge ridges Compromised muscle coordination Shape/Form of Posterior Teeth Vertical Length of Buccal Surfaces of Posterior Teeth is determined by the  amount of the inerarch distances, the greater the distance, the longer the teeth It is desirable to select posterior teeth corresponding to the interarch space and to the length of anterior teeth Material for Artificial Teeth :In the past 
  4. 4. Wood Bone Ivory Crowns of natural teeth Material for Anterior Teeth Porcelain  Acrylic  Material for Posterior Teeth Porcelain Acrylic resin Acrylic resin with metal occlusals (Interpenetrating polymer network resin teeth (IPN Material for Posterior Teeth :Porcelain posterior teeth  Durable Chewing efficiency maintained Vertical dimension preserved Free of stains Material for Posterior Teeth :Porcelain posterior teeth  :Disadvantages  Time consuming for occlusal adjustments Mechanically bonded Require adequate arch space May be noisy Will abrade the opposing natural teeth and occlusal gold surfaces Material for Posterior Teeth :Acrylic resin teeth  Easy to set up teeth Easy for occlusal adjustments Reduced interarch space Oppose natural teeth and gold occlusal surfaces Bond chemically with acrylic denture base Material for Posterior Teeth :Acrylic resin teeth  :Disadvantages  Loss of vertical dimension over time Less masticatory efficiency -
  5. 5. Occlusal wear Stained easily - http://trubyte.dentsply.com/professional_home/dentalprofessional.htm
  6. 6. Occlusal wear Stained easily - http://trubyte.dentsply.com/professional_home/dentalprofessional.htm

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