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Results for “DENTAL IMPRESSION MATERIALS”

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At least 163 records · Page 9Linked to original sources
PubMed1991

Defects in automixed addition silicone elastomers prepared by putty-wash impression technique.

Voids presenting in impressions of five automixed addition silicone elastomers were investigated. Impressions were prepared with the putty-light body impression technique on stainless-steel cylinders with acrylic spacers. The number of voids was counted at a predetermined site on three separate days using a stereomicroscope at x7 magnification. Impression specimens of a hand-mixed addition silicone, and from hand-mixing of the automixed materials, were made for comparison. Express gave a significantly higher number of voids than other automixed materials, with President Jet having the lowest void count. Automixed materials generally produced impressions with significantly fewer voids than the hand-mixed material. Automixing was effective in reducing void defects in elastomeric impressions.

Dental Impression Materials↗
PubMedDate not supplied

The effect of custom tray material type and surface treatment on the tensile bond strength of an impression material/adhesive system.

The purpose of this investigation was to evaluate the tensile bond strength of one type of impression material adhesive to three different custom tray materials: one autopolymerizing (Fastray) and two light-polymerizing (Triad and Extoral). The effect of different surface treatments was evaluated for each of the materials. No significant difference in impression material adhesive mean tensile bond strengths was exhibited for any of the materials as the result of variations in the surface treatment. It was observed that the Triad tray material groups, with different surface treatments, exhibited significantly higher impression material adhesive mean tensile bond strengths than the autopolymerizing tray resin and the Extoral light-polymerizing material.

Acrylic Resins↗
PubMed1998

The effect of disinfecting alginate and addition cured silicone rubber impression materials on the physical properties of impressions and resultant casts.

Four commercially available disinfectants were tested and the dimensional stability and detail reproduction of impressions and their resultant casts were measured according to ANSI/ISO specifications. Results showed that alginate impressions immersed in chlorhexidine exhibited considerable dimensional change if not poured immediately. Moreover, alginate impressions soaked in a paraldehyde agent (Virkon) for more than 2 minutes produced casts of inferior surface quality whilst those sprayed and left in contact with phenol derivatives (C&J Spray) for 30 minutes resulted in casts which demonstrated statistically and clinically significant dimensional changes. Addition cured silicone impressions exhibited minimal dimensional change regardless of the disinfection regime employed and the resultant casts were accurate with acceptable surface quality.

Alginates↗
PubMed1990

Occlusal accuracy of casts made and articulated differently.

This study evaluated the occlusal accuracy of gypsum casts constructed from irreversible hydrocolloid and selected nonaqueous elastomeric materials. Master metal casts were attached to a vertically moving apparatus that allowed their occlusal surfaces to produce repeatable contacts. Impressions were made with irreversible hydrocolloid, polysulfide, and vinylsiloxane. Resulting maxillary casts were mounted with a constant positioning device and mandibular casts were mounted with zinc oxide-eugenol paste records or by maximum intercuspation. Four specific master occlusal contacts were compared with contacts generated from the mounted gypsum casts; a perfect score was 40 (four contacts x 10 casts). A chi-square linear model for category data was used to compare groups. Results indicated that casts made from irreversible hydrocolloid should not be articulated with the use of a zinc oxide-eugenol paste but are best articulated by using maximum intercuspation (32/40 contacts).

Chi-Square Distribution↗
PubMedDate not supplied

Bond strength of three nonaqueous elastomeric impression materials to a light-activated resin tray.

The bonding of nonaqueous elastomeric impression materials to the impression tray is critical for an accurate impression; mechanical locks and adhesive materials are commonly used to enhance bonding. This study evaluated the bonding of three elastomeric materials to a light-polymerized resin tray. Roughening the tray surface prior to the application of an adhesive enhanced the bond.

Acrylic Resins↗