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Biomedical subjects

H O Heymann

Publications and source records attributed to H O Heymann.

59 records · Page 4Linked to original sources
PubMedDate not supplied

Finishing of MGC Dicor material.

The occlusal surfaces of inlays and onlays milled by the CEREC system are essentially flat, and surface morphology must be produced with rotary instruments. Six methods of finishing a machinable glass-ceramic material (Dicor MGC) were investigated using laser specular reflectance to assess the relative surface smoothness. The results indicated that all the methods produced a similarly smooth surface.

Analysis of Variance↗
PubMedDate not supplied

Enamel bond strengths of "one-bottle" adhesives.

PURPOSE: Several "one-bottle" dental adhesives recently have been introduced. These contain hydrophilic resin monomers that should readily wet tooth surfaces. Most also contain solvents that could increase enamel bond strengths by driving out residual moisture from enamel and increasing resin penetration. The purpose of this study was to evaluate bond strengths obtained by six one-bottle bonding agents and one conventional unfilled resin (control). METHODS: Seventy bovine teeth were randomly assigned to seven groups of 10. Enamel was etched for 15 s with 35% phosphoric acid. Following application of the adhesive, composite resin was bonded using a gelatin capsule technique. Shear bond strengths to enamel were determined. RESULTS: Mean bond strengths ranged from 14.2 MPa for Syntac Single-Component to 27.8 MPa for Single Bond. The mean for Syntac Single-Component was significantly less than that of all other systems tested. CONCLUSION: The results of this study indicate that one-bottle bonding agents, with the exception of the Syntac material, provide enamel bond strengths at least equal to that of a conventional unfilled resin.

Acid Etching, Dental↗