Tooth Selection For Partial Denture Dr.Mohammad Al Sayed 24/5/2008

Types of teeth 1.Acrylic denture base: Advantages: 1.Good bond with denture base resin. 2.Easily recontoured and polished. 3.May be used with space limited. 4.Reduce wear of opposing restorations and natural teeth. 5.Reduce the stresses transferred to the ridge by its resilience. 6.Good esthetics. Disadvantages: 1.Law abrasion resistance. 2.May stain during use.

2.Porcelain denture teeth Advantages: 1.Increases abrasion resistance. 2.Increased stain resistance. 3.Natural appearance. Disadvantages: 1.Abrade the opposing natural and artificial teeth. 2.Cannot be used in close bite cases. 3.More susceptible to fracture. 4.Mechanical bond is required to denture base resins. 5.Polishing of ground surfaces is difficult. 6.Clicking during function.

Facings 3.Facings In anterior teeth is to be replaced metal packing with porcelain or resin facing may be used. It is usually used with metallic denture bases. Advantages: 1.Metal packing increase strength. 2.Can be used when there is insufficient interocclusal space to use resin denture teeth. Disadvantages: 1.May exhibit flat appearance, lacking of depth. 2.Metal backing may affect shade. 3.Difficulty in fabrication of metal backing due to occlusion and articulation.

4.Tube teeth: It is an acrylic or porcelain teeth in the form of a tube have a channel in its base to fit a post on the metal framework. Advantages: 1.Used as a single anterior or posterior tooth replacement, where space is available, with good esthetics. 2.No need for flasking and processing the denture teeth. The tube teeth are cemented to the metal posts. Disadvantages: 1.It requires enough space mesiodistally and occlusogingivally. 2.It is used with metallic denture base, which cannot be relined.

5.Metal teeth: Advantages: 1.Can be used where space is limited for posterior teeth replacement. 2.Increased resistance to fracture and abrasion. Disadvantages: 1.May be unaesthetic; acrylic or composite veneer will improve it. 2.Difficult to adjust occlusion and articulation.

Factors affecting selection of RPD teeth: 1.The size, form and shade should resemble that of the remaining natural teeth. 2.Amount of available space; artificial teeth are placed within the available space incisogingival and mesiodistal. 3.Mechanical properties; the anterior teeth selection is affected by the opposing occlusion, abrasion resistance, resistance to fracture, bond strength to denture base and ease of adjustment. 4.Cusp height of opposing teeth; cusp height of the artificial teeth should be equal to or slightly greater than the opposing teeth.

5.Condition of the supporting tissues in distal extension base; if it is poor the occlusal forces is reduced by: a. Using a small teeth faciolingually. b. Decreasing the number of posterior teeth. c. Space teeth with diastimas. d. Sharpening of the occlusal surface to increase the masticatory efficiency. e. Using acrylic teeth.