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Teeth of Removable Partial Denture


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Teeth of Removable Partial Denture

  1. 1. Selection of teeth according to material •Acrylic resin •* porcelain •*metals •*combination between acrylic resin & teeth
  2. 2. Acrylic resin teeth advantage •Lighter in weight •*can be modified by girding & polishing (less hardness) so can be used in close inter arch space •*chemical union with acrylic denture resilient (absorb the force) •*used in flat & flabby cases •*less noise in use disadvantage Wear easily duo to (less abrasion resistance •Easily distorted by heat •*crazing may occur duo to action of organic solvent if not cross linked •*less perfect esthetic)
  3. 3. Porcelain teeth *difficult to be modified by girding (remove the glaze) & polishing (more hardness) so can not be used in close inter arch space *mechanical union with acrylic denture less ( pins, holes & raised dots resilient (transmitte more force) * not used in flat & flabby cases *more noise in use •brittle •higher in weight * Not wear easily duo to (more abrasion resistance * Not easily distorted by heat *more resistant to the action of organic solvent *more perfect esthetic) advantagedisadvantage
  4. 4. 1(Artificial teeth attached to denture bases by an intermediate layer of acrylic resin: allows for changing the position of teeth in the waxed-up denture to produce natural appearance Porcelain and acrylic resin teeth are produced in a wide variety of shades, colour and forms that could perfectly match the remaining natural teeth resulting in good esthetic Porcelain teeth are mechanically retained to the denture bases. →The posterior porcelain teeth are attached by acrylic resin in their diatoric holes. →The anterior teeth are attached by acrylic resin around retentive pins located on the lingual surfaces of teeth. →Acrylic resin teeth are retained by chemical union with the acrylic resin covering metallic denture bases during laboratory processing
  5. 5. 2(Acrylic resin or porcelain facings cemented to denture bases Acrylic resin or porcelain facings are cemented to metal backings. The metal backing forms the lingual half of the tooth& is an extension from the partial denture framework Tooth replacements in the form of facings are fabricated by the laboratory and cemented by the dentist at the time of denture insertion. This causes difficulty in obtaining satisfactory occlusion and in providing adequate contours Advantages of facings: -Facings are inter-changeable and can be easily replaced. •Disadvantages: 1-Facings have poor esthetic quality as they lack depth& give a flat appearance. 2-The metal backing influences the shade of the plastic facing. 3-The opposing teeth may strike against the metal backings resulting in rapid wear. 4-Adding a labial flange for the denture is difficult. •Indications: 1-In restricted spaces exhibiting little horizontal overlap where strength is of great concern. 2-In cases exhibiting minimal inter-occlusal space
  6. 6. REPLACED TEETH - ANTERIOR Material: Porcelain Acrylic Acrylic denture teeth on classs IV RPD. The standard denture tooth type used for rpd’s and cd’s at the U. Of M. Porcelain denture teeth are rarely used since they are difficult to set. Porcelain facings as shown on left were used for many years but not now. The backing of the facing is framework metal with the facing adjusted to fit the buccal mucosa so no acrylic is associated with this area. The facings can come off during ultrasonic cleaning so beware. Source: Jeff Shotwell, University of Michigan, 2008
  7. 7. 3(Tube teeth& Metal Post: Tube teeth consist of either acrylic resin or porcelain denture teeth which are prepared by drilling a channel from the base of the tooth upwards to form a tube. They are usually used as single tooth replacements, where a maximum of three teeth are used. The metal partial denture framework should contain posts to which tube teeth are cemented. Disadvantages: -Tube teeth are not strong replacements hence, they should not be used when the mesiodistal or occluso-gingival space is restricted
  8. 8. 4(Reinforced acrylic pontic RAP are new replacements which contain the good features of facings and tube teeth and lack their short comings. They are made of modern cross-linked copolymers which enable the dentist to process acrylic resin teeth directly to the framework. The gingival half of the lingual surface consists of metal projections or loops around which the acrylic tooth is processed. The incisal half is a solid, hard plastic which provides good esthetics and shade control. •Advantages: -Better attachment to the metal base compared to cementation. -Long, short, wide or narrow teeth could be created to fill edentulous spaces that cannot be easily filled by commercially available teeth. -Occlusion on resin teeth may be re-established to compensate for wear.
  9. 9. 5(Metal teeth Metal teeth are usually used as replacements of posterior teeth where space is limited for the attachment of an artificial tooth. Second molars may be replaced as part of partial denture casting as a space filler to prevent migration of an opposing second molar. . •Disadvantages: a- Metal teeth are esthetically unsatisfactory. b- Difficult to attain any occlusal adjustment. c- Metal teeth are abrasion resistant, hence occlusal contact should be held to a minimum to avoid damage to the periodontium of the opposing teeth.
  10. 10. Maxillary cast molar designed as integral part of framework. Interocclusal space limitation necessitated using metal rather than another form of artificial posterior teeth. Note overlays on premolar and molar teeth used to resist tooth wear.
  11. 11. mbination between acrylic resin & teeth For decreasing the wear of the resin teeth and preserving a degree of their resiliency and to combine the advantage of both acrylic resin & metal teeth. Porcelain or resin backed with metal
  12. 12. REPLACED TEETH - POSTERIOR - Material: Acrylic posterior denture teeth - standard tooth used on rpd’s and cd’s. Much easier to set and adjust than porcelain. Clinical wear helps dissipate occlusal forces. Gold occlusal surfaces added to acrylic denture teeth opposite fixed partial denture gold occlusal surfaces to even out wear potential Occlusal chrome surfaces on this maxillary class III RPD are an extension of the framework. Acrylic facings are placed on the buccal for esthetics. Note- Not used very Source: Jeff Shotwell, University of Michigan, 2008
  13. 13. 6(Replacements with chemical bonding: Recent developments provide means of direct chemical bonding of acrylic resin to metal frameworks without using loops, mesh or mechanical locks. The section of the metal framework to support the teeth is roughened with abrasives, treated with vaporized silica coating then a resin bonding agent is applied to which a thin film of resin is added for later attachment with acrylic resin teeth