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Results for “DENTAL MODELS”

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At least 1,711 records · Page 95Linked to original sources
PubMed1987

Comparing effects of tray treatment on the accuracy of dies.

The effects of tray treatments on the accuracy of dies from addition silicone impressions were investigated. Tray treatments included custom acrylic resin tray with adhesive, perforated custom acrylic resin tray without adhesive, and perforated custom acrylic resin tray with adhesive. No appreciable differences were found in the complete crowns among the three tray treatments on the first pours. Significant statistical differences observed in the MOD and occlusal inlays were nonetheless of questionable clinical significance. Adhesives are advisable if the impressions are poured repeatedly, however, to minimize accidental separation of the impression from the tray. The second casts were less accurate with complete crowns and MOD inlays when perforated trays were used without adhesives.

Acrylic Resins↗
PubMed1988

Template for positioning and angulation of intraosseous implants.

Presurgical planning for submerged implant location and angulation within bone relative to the opposing occlusion is important for the prosthodontist. This information is accurately communicated to the surgeon by using a surgical template. A technique for fabrication of the template is described.

Dental Implantation, Endosseous↗
PubMed1991

Retention design for amalgam restorations: pins versus slots.

The use of pins or slots to provide retention for amalgam restorations has been shown to be equally effective by some authors whereas the pin method has been shown to be more effective by others. This study was done to determine whether the different methods would be affected by the outline form of the preparation. One hundred forty melamine teeth were prepared in three outline forms determined by the cusp that was removed: (1) mesiopalatal, (2) mesiopalatal and distobuccal, and (3) mesiopalatal, distobuccal, and mesiobuccal cusps. Each outline form was restored with a uniform volume of hand-condensed amalgam with pin or slot retention and milled to an occlusal angle of 30 degrees. A load was placed on the milled occlusion with a stainless steel ball to the point of fracture with an MTS machine. No significant difference was found between the pin or slot design for the outline forms evaluated.

Dental Amalgam↗
PubMed1992

The effect of a surface disinfectant on a dental cast.

This study determined the effect of a disinfectant solution on dental casts. Stone samples were immersed in a disinfectant solution and in control solutions. The results indicate that a saturated calcium sulfate (clear slurry) solution with 0.525% sodium hypochlorite was an effective disinfectant and acted without damage to the dental cast.

Calcium Sulfate↗
PubMed1992

Making an instrument for smoothing the detailed occlusal anatomy of a wax pattern.

A smooth wax pattern is imperative to reduce the polishing time of the subsequent casting. The detailed occlusal anatomy is often the most difficult portion of the wax pattern to smooth. This article describes a procedure for making a device that can be used to smooth the detailed anatomy of a wax pattern. It also describes how to use the device.

Dental Impression Technique↗
PubMed1992

Use of a scanning laser three-dimensional digitizer to evaluate dimensional accuracy of dental impression materials.

A steel die was machined to represent a dental arch with teeth prepared for complete crowns. Impressions and casts were made from the die, and critical dimensions were measured by two methods--one using micrometers and the other a scanning laser three-dimensional (3-D) digitizer. The digitizer recorded measurements were more precise than the micrometer's and virtually eliminated operator error because the acquisition of data was automatic. The digitizer could also be useful for high-precision analyses of the dimensional accuracy of dental impression materials, but the cost and complexity of the instrument makes it less desirable for low-precision work.

Calibration↗
PubMed1994

A modified impression technique for implant-supported restoration.

An impression technique is proposed for construction of implant-borne restorations that uses a modified autopolymerizing resin custom tray to allow splinting of the impression copings directly to the tray. This method eliminates the use of the dental floss-autopolymerizing resin complex, thus decreasing resin distortion and simplifying the clinical procedures.

Acrylic Resins↗
PubMed2006

Assessment of the amount of remaining coronal dentine in root-treated teeth.

OBJECTIVES: There is currently no standardised technique to measure the amount of coronal dentine remaining in a root-treated tooth after crown preparation. The aim of this study was to develop a method of measuring remaining coronal dentine in root-treated teeth and to propose an index for grading tooth restorability. METHODS: The study recruited 20 patients who had completed molar endodontic treatment at the Eastman Dental Hospital and had been prescribed an amalgam coronal-radicular core with a full coverage cast restoration. Using a series of interlocking special trays and impressions, a method was devised to produce a cast of the amount of remaining dentine coronal to the finish line after crown preparation. This cast was scanned using a laser profilometer and the volume of remaining dentine was calculated. A tooth restorability index (TRI) was developed to assess the strategic value of the remaining dentine. The TRI allowed scores of 0-3 in each sextant with a maximum score of 18 per tooth. RESULTS: Twenty teeth were scored by three examiners and the TRI scores varied from 2 to 13. The volume of coronal dentine varied from 61.73 to 232.22 mm(3). CONCLUSIONS: A tooth restorability index has been devised to assess the strategic value of remaining dentine. A Kappa statistic was calculated to produce values of 0.584, 0.688 and 0.720, giving moderate-good agreement between the examiners.

Crowns↗