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At least 109 records · Page 6Linked to original sources
PubMed2003

The fastest and best provisional restorations.

Many options are available for PRs for teeth prepared for crowns, veneers, inlays, onlays or fixed prosthetic abutments. Dentists and dental assistants (where allowed by law) should know the physical properties of the various types of materials and should be able to select and place the appropriate type of PR based on the needs of specific clinical situations.

Acrylic Resins↗
PubMed2002

Flexural strength of provisional crown and fixed partial denture resins.

STATEMENT OF PROBLEM: Provisional prostheses are subject to flexure under function. Selection of the appropriate material for their fabrication is difficult given the limited evidence-based information on the flexural strength of provisional resins. PURPOSE: This study compared the flexural strength of 5 methacrylate-based resins and 8 bis-acryl resins used to fabricate provisional crowns and fixed partial dentures. MATERIAL AND METHODS: Bar-type specimens were fabricated according to American National Standards Institute/American Dental Association specification 27. After being immersed in artificial saliva at 37 degrees C for 10 days, the specimens were fractured under 3-point loading in a universal testing machine at a crosshead speed of 0.75 mm/min. Maximal loads to fracture in Newtons were recorded. Mean flexural strengths were calculated in MPa (n = 10 per group). Comparisons were made with analysis of variance and Duncan's multiple range test (P<.05). RESULTS: Mean flexural strengths ranged from 56.2 to 123.6 MPa. There were 4 statistically similar groups. The group with the highest strengths consisted of 4 bis-acryl materials (Provipont, Integrity, Protemp 3 Garant, and Luxatemp). CONCLUSION: Within the limitations of this study, flexural strengths were material- rather than category-specific. Some, but not all, bis-acryl resins demonstrated significantly superior flexural strength over traditional methacrylate resins.

Acrylic Resins↗
PubMedDate not supplied

Effect of glass-fiber reinforcement and water storage on fracture toughness (KIC) of polymer-based provisional crown and FPD materials.

PURPOSE: The effect of glass-fiber reinforcement and water storage on the fracture toughness (KIC) of polymer-based provisional crown and fixed partial denture (FPD) materials was investigated. MATERIALS AND METHODS: Five unreinforced single-edged, notched control specimens and five test specimens reinforced with unidirectional E-glass fibers (Stick) were fabricated from three dimethacrylate-based provisional materials and one monomethacrylate-based provisional material. The specimens were stored in water at 37 degrees C for 1, 7, 30, or 60 days. Specimens were loaded in three-point bending at a cross-head speed of 0.1 mm/s. Mode I plane-strain KIC was calculated using the maximum load, and results of the two groups were compared. The water storage effect on KIC with time was also evaluated. RESULTS: The KIC of provisional materials reinforced with glass fibers (range 7.5 to 13.8 MNm(-1.5)) was significantly higher than that of unreinforced materials (range 1.3 to 3.1 MNm(-1.5)), by a factor of 4.4 to 5.5. A small, gradual decrease of KIC in reinforced specimens occurred with aqueous storage, but it was not statistically significant. CONCLUSION: The KIC of polymer-based provisional crown and FPD materials was significantly increased when they were reinforced with unidirectional E-glass fibers. Water storage for up to 2 months still left the reinforced materials with KIC values in excess of 7 MNm(-1.5). Hence, their performance was satisfactory.

Acrylic Resins↗
PubMed1992

[Observations on prosthetic restoration in children].

In young children there are two frequent factors, that cause edentation: the syndrome of the sugar "baby's bottle" or the "honey dummy" and tooth-loss by trauma. Multiple extractions can be programmed in children for reason of general condition, in the major concern to remove present or potential infectious foci. Still less frequently, sometimes lately diagnosed anomalies in number or structure oblige to replacement of missing or deficient tooth. The complexity of these restorations can be related to technical problems, less frequent, in contradiction to the current opinion, to psychological problems. They have to be integrated in structures in growth, the key character of each treatment in children or adolescents. Consequently it is necessary to take account of all this factors, before to attempt this charge, and to foresee adaptations, regular control, succession of the case and interception.

Child↗