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Biomedical subjects

R L Bertolotti

Publications and source records attributed to R L Bertolotti.

16 recordsLinked to original sources
PubMed1990

Adhesion monomers utilized for fixed partial denture (porcelain/metal) repair.

A technique is presented for repair of fatigue-fractured fixed partial dentures with an overlaid, bonded porcelain/metal repair. The repair techniques utilize recent advances in resin-to-metal and resin-to-porcelain adhesion. Clinical procedures are given for adhesion of repair castings to intraoral porcelain or metal surfaces. Metal surface preparation techniques depend on the chemistry of the metal and include intraoral tin plating of noble metals. Direct adhesion of composite resin luting agents is used for base metals.

Adhesives↗
PubMed1990

Removal of "black-line" margins and improving esthetics of porcelain-fused-to-metal crowns: update in technique.

A repair technique is presented for elimination of "black line" crown margins and extension of margins onto cervical surfaces. A resin bonding agent that adheres simultaneously to metal, porcelain, and dentin is utilized to expedite completion of the repair. The bonding resin is opaqued with a light-curing, filled resin and then covered with a suitable composite resin. This technique updates a previously published technique by eliminating glass-ionomer cement liners and liner etching and improves both efficiency and esthetics of the repair.

Composite Resins↗
PubMed1990

Casting metals, Part I.

The status of casting alloys is presented with regard to metallurgical considerations, clinical properties, sales, and evolution of alloys from a historic perspective. Alloys are classified on the basis of 1) normal-fusing (non-porcelain bonding); and 2) high-fusing (porcelain bonding) and on nobility within these two groups. Part I of this two-part series details normal-fusing alloys. High-fusing alloys will be discussed in Part II.

Dental Alloys↗
PubMed1988

Indirect veneers.

Explore the source record for details and available documents.

Acrylic Resins↗
PubMed1979

Viscosity of dental porcelain as a function of temperature.

A method for viscosity measurement is described and representative data are given for opaque, gingival, and incisal porcelains. The significance of viscosity in annealing and in stress development due to thermal expansion mismatch is discussed. Thermal history of the porcelain is shown to be important only over a relatively small temperature interval in affecting residual stresses.

Dental Porcelain↗
PubMed1978

Inhibition of corrosion during autoclave sterilization of carbon steel dental instruments.

Comparisons were made of several dip-applied corrosion inhibitors for protection of carbon steel dental instruments during autoclaving. Although none were totally effective, several provided significant corrosion inhibition. Sodium nitrite and one proprietary inhibitor were about equally effective and notably superior to the other inhibitors investigated. Because sodium nitrite is a food preservative that is relatively harmless when ingested in small quantities, whereas commercial inhibitors are of proprietary composition and unspecified toxicity, we prefer to use sodium nitrite for corrosion inhibition during autoclaving. Sodium nitritie is readily available from chemical suppliers and is generally much less expensive than most commercial inhibitors. Although the autoclave used in this investigation is typical of many used in clinical situations, minor variations in design, steam impurities, and other unknown factors might effect the results. Further research is needed to determine the corrosive effects of impurities in the steam supply, residual detergents, method of postautoclave drying, steam supply deoxygenation, pH, and possibly the use of oxygen scavengers within the autoclave.

Alloys↗
PubMedDate not supplied

Total etch--the rational dentin bonding protocol.

Phosphoric acid etching of dentin is critically reexamined in view of current adhesive resin development. Research and clinical experience both suggest that "total etch," the simultaneous etching of dentin and enamel, is a rational protocol with many modern adhesive resins.

Acid Etching, Dental↗
PubMedDate not supplied

Posterior composite technique utilizing directed polymerization shrinkage and a novel matrix.

A technique is described for novel placement of posterior composites. Two frequently encountered problems are eliminated with this technique: difficulty in achieving good interproximal contacts and composite shrinkage away from the tooth. The desirability of indirect composites is questioned in view of recent research and the technique for direct composites described.

Bicuspid↗
PubMedDate not supplied

Adhesive monomers for porcelain repair.

The purpose of this investigation was to test the bond strengths of several adhesive systems intended for intraoral resin-to-porcelain and resin-to-metal bonding. All measurements were compared with resin bonding to etched bovine enamel. Based on these data and the authors' own clinical experiences, protocols for intraoral porcelain repair are presented for fractures in porcelain only, fractures with both porcelain and metal exposed, and fractures with all metal exposure.

Dental Bonding↗