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At least 1,135 records · Page 63Linked to original sources
PubMedDate not supplied

A new and indirect working die technique for fabricating temporary restorations.

A time- and labor-saving indirect method for fabricating temporary restorations that features removable dies (coined the indirect working die technique), is introduced and described. It takes advantage of the accuracy of the traditional indirect method, as substantiated in the literature, but employs new methods and uses materials in a novel way.

Acrylic Resins↗
PubMedDate not supplied

Effect of cavity form and setting expansion of refractory dies on adaptability of fired ceramic inlays.

The purpose of this study was to investigate the effect of cavity form and setting expansion of refractory die materials on the adaptability of fired ceramic inlays. Standardized Class I cavities with three kinds of lateral wall divergences (10 degrees, 20 degrees, and 30 degrees) and three kinds of surface roughness were prepared in epoxy resin blocks. A refractory die was prepared from an impression of the epoxy resin cavity, whose setting expansion ranged from 0.01 to 1.13%. A ceramic inlay was fired on each die. The fabricated inlay was inserted into the epoxy resin cavity, and the interfacial distance between the ceramic inlay and the cavity wall at the margin was measured using a reflecting microscope at X100 magnification. The internal fit was measured after sectioning the specimen longitudinally. The results were analyzed by ANOVA and Sheffé's F test. Good adaptation was achieved with the smooth-surface cavity. The adaptability depended on the angle of the cavity divergence, and small gaps were observed in 20 degrees and 30 degrees cavities (P < 0.05). The inlays fabricated on the refractory dies with a small setting expansion demonstrated small internal gaps. Significantly good adaptation was achieved when the setting expansion was less than 0.2% (P < 0.05). The results indicated that the cavity form and the setting expansion of the refractory die material had significant effects on the adaptability of fired ceramic inlays.

Analysis of Variance↗
PubMed2000

Placement of direct composite veneers utilizing a silicone buildup guide and intraoral mock-up.

The indications for direct composite resins have recently been expanded to include predictable and convenient application in the aesthetic zone. The availability of composite materials with improved physical and optical characteristics facilitates the development of enhanced aesthetics while maintaining vital function. This article presents a simplified technique that combines function with aesthetics by utilizing an intraoral composite mock-up for initial communication and a lingual/incisal silicone stent of the mock-up to transfer the information to the definitive restorative buildup.

Acid Etching, Dental↗
PubMed2001

Implant placement in the vertically enhanced ridge--a surgical and restorative interdisciplinary approach.

A diagnostic and therapeutic approach is offered to enable the surgeon and restorative dentist to successfully install endosseous implants into the vertically enhanced ridge. The strategy involves the use of diagnostic and surgical templates to aid in the creation of positive osseous architecture followed by the vertical orientation of the endosseous implant(s). This effort provides optimal hard-tissue and soft-tissue form for the creation of the most favorable crown profiles for implant-supported prostheses.

Alveolar Bone Loss↗
PubMed2002

A simplified impression technique for dental implants.

Dental implants have been considered an acceptable form of dental treatment since the early 1980s. A number of studies have been published describing impression techniques for dental implants. Many of the techniques described are so complex that they may seem daunting to the average restorative dentist. Most general practitioners do not wish to attempt to restore dental implants. This article describes a very simple, yet extremely accurate, technique for making impressions of dental implant fixtures.

Acrylic Resins↗
PubMedDate not supplied

Influence of prosthesis fit and the effect of a luting system on the prosthetic connection preload: an in vitro study.

PURPOSE: It was the aim of this study to evaluate the efficiency of a luting technique that is said to compensate for misfits of implant-supported prostheses by means of a combined screw retained-luted fixation of the prostheses to the supporting abutments. MATERIALS AND METHODS: One three-unit prosthesis was made on cylindric abutments, and one was made on conical abutments. Two more prostheses were made, one on the cylindric and one on the conical abutments, with the luting system. The preload was measured in different fit and misfit situations, with and without the use of the luting system. The preload is a combination of internal preload (positive axial forces), which is a clamping load that keeps the implant-prosthesis components together, and external preload (axial forces and bending moments), which is the result of a deformation of the implant-prosthesis complex during fixation caused by prosthesis misfit. The external preload on the supporting abutments after screw tightening the prostheses was used as an indicator for the quality of fit of the prostheses. RESULTS: The axial forces were lower and the bending moments were higher in cases of misfit in comparison with the optimal fit situation. The luting system generally did not decrease the registered external preload. Except for one test condition, even higher bending moments were registered on the supporting abutments when the luting system was used. CONCLUSION: For the prostheses evaluated in this study, the luting system was not effective in reducing the external preload on the supporting implants caused by prosthesis misfit. Although the luting system could compensate for visual misfit, it failed to really improve the load conditions of the supporting implants.

Cementation↗
PubMed2002

Microleakage and damage to adjacent teeth when finishing Class II adhesive preparations using either a sonic device or bur.

PURPOSE: To detetmine the damage to adjacent tooth surfaces and the quality of the marginal seal of a resin-based composite restoration when a sonic preparation device (Sonicsys) was used to finish the preparation outline. MATERIALS AND METHODS: Three general practitioners prepared 60 Class II box-type cavities in extracted teeth placed in an artificial jaw in a phantom-head. In 30 preparations a bevel was made with a bur, in the other 30 restorations the margins were finished using the sonic preparation device. All preparations were restored with a total-etch technique and a posterior composite (SA primer-Photo Bond-Clearfil PhotoPosterior). Microleakage was tested and the adjacent teeth were inspected for iatrogenic damage. RESULTS: No statistically significant differences in microleakage were observed between the experimental and control groups. In the control group, 80% of the approximal surfaces of adjacent teeth were damaged while only 30% of the adjacent surfaces were damaged in the experimental group (P < 0.05, Chi-square test).

Bicuspid↗