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Results for “DENTAL IMPRESSION MATERIALS”

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At least 1,207 records · Page 67Linked to original sources
PubMed1990

Reversible agar agar hydrocolloid.

Reversible agar agar hydrocolloid remains an excellent, cost-effective impression material. A review of the history of the development of the material and a sound technique for its use are presented.

Agar↗
PubMedDate not supplied

Effects of cavity form and setting expansion of refractory dies on adaptability of Class II (MO and MOD) fired ceramic inlays.

This study investigated the effects of cavity divergence and setting expansion of refractory die material on the adaptability of Class II (MO and MOD) fired ceramic inlays. Standardized Class II (MO and MOD) cavities with two kinds of lateral wall divergence (10 and 20 degrees) were prepared in epoxy resin blocks. A refractory die was prepared from an impression of the epoxy resin cavity in which the setting expansion ranged from 0.04 to 1.14%. 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 indicate that the setting expansion of the refractory die materials and the divergence of the lateral walls had significant effects on the adaptability of Class II (MO and MOD) fired ceramic inlays. The inlays fabricated on the refractory dies with small setting expansion showed small internal gaps in Class II (MO) cavities. Significantly good adaptation was achieved when the setting expansion was 0.32% or less (p < 0.05). The inlays fabricated on the refractory dies with large setting expansion showed small internal gaps in Class II (MOD) cavities. Significantly good adaptation was achieved when the setting expansion was 0.87% and greater (p < 0.05).

Analysis of Variance↗
PubMed1992

Polyvinyl siloxane impression materials: a review of properties and techniques.

Polyvinyl siloxane impression materials have been shown to have excellent properties as impression materials; however, they are sensitive to manipulative variables. Several methods of using very high viscosity (putty) materials to form "trays" to obtain uniform bulk of the wash impression are described, and the disadvantages of each of these techniques is pointed out. It is recommended that for best results acrylic resin custom trays should be used routinely. The interaction of polyvinyl siloxane materials with latex products is also discussed and problems that this inhibition can cause are stated. Suggestions to avoid this interaction are outlined. One of the disadvantages of the impression materials is that it has a relatively short working time. Refrigerating the material will increase working time without affecting accuracy.

Acrylic Resins↗
PubMed1978

[Total prosthesis--a review of the literature].

A review of literature on full denture prosthetics is given with reference to the newest scientific results with clinical relevance. Presently, the accent seems to be on gerontological problems, on basic research of the denture bearing tissues and on the entire masticatory system after loss of teeth and under the influence of prosthetic rehabilitation. Finally research on dental materials and on microbiological problems are raised. An increasing number of investigations critically deals with existing and clinically proven methods and concepts of full denture construction. In the review of literature special fields like hybrid prosthetics and defect prosthetics have not been included, prosthetic materials only in special instances.

Adult↗
PubMed1989

Linear distortion and compatibility of an antimicrobial irreversible hydrocolloid impression material and improved dental stones.

Blueprint Asept Type I irreversible hydrocolloid impression material is claimed by the manufacturers to contain an internal disinfecting agent that is effective within 10 minutes from contact with pathogens. This study examined the accuracy of the material compared with a conventional impression material and its compatibility with two type III and one type IV dental stones. This study did not evaluate the effectiveness of the disinfecting agent.

Alginates↗
PubMed2002

The influence of tray type and other variables on the palatal depth of casts made from irreversible hydrocolloid impressions.

STATEMENT OF PROBLEM: There are conflicting data regarding the effect of various factors on the palatal depth of casts made from irreversible hydrocolloid impressions. PURPOSE: This study examined the influence of tray type, water temperature, pouring technique, and stone expansion on the palatal depth of casts. MATERIAL AND METHODS: Irreversible hydrocolloid impressions were made of a model under simulated oral conditions. Palatal depth was measured relative to a reference plane with a microscope. The reference planes were standardized by subjecting the data to three 2-dimensional mathematic rotations. A 2-factor analysis of variance (alpha=.05) was used to determine whether differences existed among tray types and among palatal locations. RESULTS: The palatal depth of the casts increased approximately 0.06 mm compared with the master model with all but 2 variables. Statistical testing revealed that increased depth was not attributable to water temperature (52 degrees F or 72 degrees F) or tray type (custom resin, perforated metal, metal rimlock, or rimlock with built-up palate). Custom resin tray impressions poured with a lower expansion stone and perforated tray impressions inverted onto a base made from the same mix of stone resulted in casts with palatal depths most similar to that of the master model (P<.001). CONCLUSIONS: Casts with palatal contours of comparable accuracy were obtained with the use of a stock metal or customized tray and the use of differing water temperatures to mix the impression material.

Acrylic Resins↗
PubMed1997

Ocular prosthetics: use of a tissue conditioner material to modify a stock ocular prosthesis.

The custom-made ocular prosthesis contributes to enhanced tissue health of the anophthalmic socket. For this purpose, an acrylic resin ocular prosthesis may be modified, by using an appropriate dental impression material and being adapted closely to the anophthalmic socket. The modeling impression material is subsequently replaced by acrylic resin. This article describes the application of a viscoelastic tissue conditioner material, as an impression medium for prosthetic modification of an ocular prosthesis. The tissue conditioner material exhibits favorable tissue compatibility, adhesion to acrylic resin, and detailed surface registration. These advantages facilitate the clinical procedure and evaluation of modifications made to the ocular prosthesis.

Acrylic Resins↗
PubMed1998

A universal boxing procedure: irreversible hydrocolloid and magnetic strip.

The goal of impression making is an accurate cast. The boxing procedure is a crucial step to preserve the details of the final impression especially of the vestibular area. This article describes an alternative boxing procedure that is compatible with all impression materials, is efficient, simple, inexpensive, and practicable.

Alginates↗