Eugene F. Huget

Effects of a warm gutta-percha technique on the lateral periodontium☆

The microanatomy of lateral periodontal tissues was examined after root canal obturation by a warm gutta-percha technique had been accomplished. Inflammatory responses were slight and of shot duration. The use of hot instruments for the condensation of the filling material did not appear to endanger the integrity of the lateral periodontium.

Apparent Cytotoxicity of Base Metal Casting Alloys

The cytotoxic potential of four alloy materials was tested; three were Ni-Cr based alloys and one was a Fe-Cr based alloy. Adverse cellular changes were not found in tissue culture studies of castings of the alloys. Cultures containing Ni-Cr powders did show prominent zones of lysis and cell alteration. The cytologic potential of products obtained from surfaces of casting alloys may offer means for estimating long-term clinical toxicity.

Aluminum Oxide as a Reinforcing Agent for Zinc Oxide-Eugenol-o-Ethoxybenzoic Acid Cements

Substitution of aluminum oxide for fused quartz in zinc oxide-eugenol-o-ethoxybenzoic acid cements improved compressive strength and lessened film thickness. Physical properties were similar to those of zinc phosphate cement. The material is useful clinically for crown and bridge cementation. for insulating bases, and for temporary restorations.

Dimensional stability of temporary restoratives

The effects of thermal cycling on the dimensional stability of temporary restoratives were studied. Stability appeared to be affected significantly by water content. On thermal cycling, Cavit showed less linear dimensional change than two cements containing zinc oxide-eugenol and gutta-percha temporary stopping.

Characterization of Zinc Oxide-Eugenol Cements Reinforced with Acrylic Resin

Zinc oxide-eugenol cements reinforced with poly(methyl methacrylate) have significantly higher strength than unmodified formulations. The degree of reinforcement appears to depend on the particle sizes and uniformity of distribution of the resin constituents.

Evaluation of resin die materials

Some mechanical properties, physical characteristics, and manipulative features of three resin-based die materials were assessed. Advantages afforded by the strength and hardness of the test materials were overshadowed by relatively long setting times, incompatability with certain impression materials, and polymerization shrinkage. All dies aged beyond 24 hours were found to be unsuitable for use in precision fixed phosthodontic procedures.

Effects of Heat Treatment on Mechanical Properties of two Nickel-Chromium-Based Casting Alloys

Mechanical and heat treatment characteristics of two nickel-chromium-based dental casting alloys were investigated. Both alloys showed rapid response to heat treatment. In their softened state the alloys lost 25 to 50% of their as-cast hardness. Elongation was 20 to 45%. Rehardening nearly restored as-cast strength, whereas elongation values remained at 10 to 17%.

The rheologic properties of endodontic sealers

The rheologic properties of seven endodontic sealers were investigated with a rotational viscometer. The effects of time and rate of shear on the measured viscosities were determined. Results indicated that one material exhibited Newtonian behavior, whereas the others were characterized by pseudoplasticity.

Characterization of two ceramic-base-metal alloys

Compositions, microstructures, properties, and heat treatment characteristics of two ceramic-base-metal alloys were studied. The materials displayed significant compositional and structural differences. Both alloys were strengthened by precipitation hardening. Strength and rigidity of the nickel-chromium alloys suggest their potential usefulness in fixed prosthodontic procedures.

Observations on gold-palladium-silver and gold-palladium alloys

Properties, heat treatment response, structure, and composition of three high-fusing crown and fixed partial denture alloys were studied. Except for elongation, the properties of two gold-palladium-silver based materials were compared to those of a gold-palladium alloy. The greater elongation of the latter material was attributed to its intragranular homogeneity.