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At least 199 records · Page 11Linked to original sources
PubMed2006

Effect of pontic height on the fracture strength of reinforced interim fixed partial dentures.

OBJECTIVES: This in vitro study evaluated the fracture load of interim FPDs made with various materials and pontic heights. The hypothesis was that different materials and pontic heights result in different fracture resistance. METHODS: Groups of interim FPDs were fabricated with prosthodontic resin materials on two abutments with two different pontic heights (4.3 and 5.8 mm) and a pontic width of 4 units (19 mm) (n = 3). The following materials were tested: (1) a thermoplastic polymer (Promysan Star), (2) Promysan Star with a veneering composite (Vita Zeta), (3) a non-impregnated polyethylene fiber reinforced resin (Ribbond) with a veneering composite (Sinfony), (4) an impregnated fiber reinforced composite system (Targis/Vectris), and (5) a conventional poly methyl methacrylate (PMMA) (Biodent K+B, control group). After 5000 thermocycles, the FPDs were temporarily fixed with a provisional cement on the corresponding abutments and tested for fracture strength. One-way and two-way ANOVA and Bonferroni-Dunn's multiple comparison tests were performed for the statistical analysis (alpha = 0.05). RESULTS: The mean fracture strength ranged from 83.0 to 625.9 N for a pontic height of 4.3 mm and from 97.2 to 893.7 N for a pontic height of 5.8 mm. Vectris/Targis FPDs of both pontic heights exhibited significantly superior fracture resistance compared to the corresponding Promysan, Promysan/Vita Zeta, Ribbond/Sinfony and Biodent groups. Except Biodent FPDs, fracture resistance of FPDs with a pontic height of 4.3 mm showed no significant differences compared to a pontic height of 5.8 mm for each material. SIGNIFICANCE: Material type of the FPDs has a significant influence on the fracture strength, whereas pontic height has no significant effect (except control group).

Analysis of Variance↗
PubMed1996

Replacement of a fractured unilateral removable partial denture with a nonrigid fixed prosthesis: a clinical report.

Replacement of a fractured unilateral RPD with a five-unit nonrigid FPD was described in this clinical report, with the following advantages. (1) Swallowing or aspiration of a unilateral removable prosthesis will be avoided. (2) Fracture of solid metal connectors is diminished. (3) Metal-ceramic retainers and pontics will improve the patient's esthetic and functional demands.

Adult↗
PubMed1997

Pattern waxes and inaccuracies in fixed and removable partial denture castings.

It is the desire of every dentist and dental technician to produce a restoration that will fit the patient with a minimum of adjustments and certainly one that does not require remaking. Yet many abuse the materials with which they work, either through improper manipulation, lack of familiarity with their properties, or by attempting to reduce laboratory time by taking short cuts. Wax is one of the materials that requires more knowledge and skill to manipulate accurately because it has a considerably higher coefficient of thermal expansion (and contraction) than any other dental material. It often contributes considerably to the inaccuracies of cast dental restorations. This article provides a review of dental waxes used to make prosthodontic castings and points out some of the properties of waxes that must be controlled to make accurate restorations.

Dental Casting Investment↗