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Biomedical subjects

T G Berry

Publications and source records attributed to T G Berry.

At least 19 recordsLinked to original sources
PubMed1998

Amalgam at the new millennium.

Dental amalgam has served as an excellent and versatile restorative material for many years, despite periods of controversy. The authors review its history, summarize the evidence in regard to its performance and offer predictions for the future of this material. For the present, amalgam should remain the material of choice for economical direct restoration of posterior teeth. When esthetic concerns are paramount, tooth-colored materials, placed meticulously, can provide an acceptable alternative.

Biocompatible Materials↗
PubMed1997

Clinical application of a direct placement mercury-free alloy.

This article provides information about a recently introduced, mercury-free restorative alloy. This direct placement alloy uses gallium rather than mercury to mix the alloy particles. The material has recently been approved for use in the United States. Although its handling and physical properties are similar in most ways to amalgam, there are a few differences that require careful attention to assure success for the restoration. This article discusses these handling characteristics, the procedures for placement, and offers specific directions and recommendations to avoid potential problems with its use. Information on recent clinical research is included in the article.

Dental Alloys↗
PubMed1995

Clinical evaluation of high-copper amalgams.

PURPOSE: To compare the clinical performance of two high-copper amalgam alloys with different compositions by evaluating marginal fracture of each restoration over a 2-year period. MATERIALS AND METHODS: Restorations of Valiant PhD and Zenith Premium alloy were placed in Class I and II cavity preparations in patients and evaluated at baseline, 1 and 2 years to determine their degree of marginal breakdown. RESULTS: After 2 years, the Zenith Premium alloy exhibited significantly less marginal breakdown than the Valiant PhD alloy with no significant additional deterioration of the Zenith restorations between the 1st and 2nd year. The data indicate that the Zenith Premium alloy exhibits less marginal deterioration than Valiant PhD so it may be predicted that it will perform better long term. A possible explanation for this better performance may be that the Zenith Premium contains zinc while the Valiant PhD includes palladium but no zinc in its formulation.

Alloys↗
PubMed1994

Almost two centuries with amalgam: where are we today?

Amalgam has provided valuable and comparatively inexpensive service to patients for a longer time than any other restorative material. Despite the excitement surrounding the use of each new restorative material, each has a shortcoming that amalgam hasn't.

Composite Resins↗
PubMed1992

Zinc-containing high copper amalgams: a 3-year clinical evaluation.

Dispersalloy with a 0.9% zinc and a non-zinc composition and Tytin with a 1.0%, 0.33% and a non-zinc formula were evaluated. Thirty-nine patients received 247 amalgam restorations, in which these five formulas were randomly placed. Results after 3 years indicate that the zinc-containing alloys had less fracture at the margins than the non-zinc alloys. The data indicate that small amounts of zinc (approximately 1%) play a beneficial role in the serviceability of high copper amalgams.

Adult↗
PubMed1990

Effectiveness of nitric-NPG as a conditioning agent for enamel.

This in vitro study was designed to measure the bond strength of composite resin to enamel treated with various regimes of HNO3-NPG (N-phenylglycine and glycidylmethacrylate) followed by application of PMDM (pyromellitic dianhydride and 2-hydroxyethyl methacrylate). Forty freshly extracted human teeth were prepared with a flat area entirely in enamel on the proximal surface and then divided into five groups. Group 1 was treated with 37% H3PO4, Group 2 with 2.5% HNO3-NPG while rubbing the enamel with the solution, Group 3 with 2.5% HNO3-NPG without rubbing, Group 4 with 37% H3PO4 plus 2.5% HNO3-NPG with rubbing, and Group 5 with 5% HNO3-NPG without rubbing. After drying, PMDM solution was applied to each specimen for 60 seconds. Unfilled resin was applied, cured for 20 seconds, and the composite resin was placed and cured from all sides for a total of 120 seconds. After water bath storage for 7 days, specimens were tested on an Instron machine at a crosshead speed of 2.0mm/min. The highest shear bond strengths measured were for Group 1 (22.7 MPa), followed by Group 2 (20.92 MPa). The lowest bond strength recorded was for Group 3 (14.43 MPa). The results of this study indicate that enamel surfaces treated with 2.5% HNO3-NPG solution, if the solution is rubbed during application, produce a bond strength comparable to that achieved by H3PO4 conditioning.

Acid Etching, Dental↗
PubMed1990

3-year clinical evaluation of glass ionomer cements as Class III restorations.

Two glass ionomer restorative materials, Chelon and Ketac-Fil were placed in Class III cavity preparations and compared to a conventional composite resin. Patients were recalled at 6 months, 1 year, 2 years, and 3 years for evaluation using the USPHS-Ryge criteria. The glass ionomer cements compared favorably to the composite resin in color match, anatomic form, and caries rate, but did exhibit substancial cavosurface discoloration and marginal deterioration. However, post-operative sensitivity was not evident, and no restorations required replacement during the 3 years.

Bisphenol A-Glycidyl Methacrylate↗
PubMed1989

Dentin bonding vs. enamel bonding of composite restorations: a clinical evaluation.

The effect of dentinal bonding of composite resins was compared with that of enamel bonding. Two operators placed 192 composite resin restorations using enamel bonding or dentinal bonding on the two types of resin chosen for the study. Patients were recalled at the end of one year and two years. The restorations were evaluated clinically in the following categories: color match, cavo-surface discoloration, anatomical form, marginal adaptation, and recurrent caries. It was concluded for the evaluations that dentin bonding is not as effective as enamel bonding in protecting the composite restoration against cavo-surface discoloration and deterioration in marginal adaptation.

Composite Resins↗
PubMed1971

I enjoy teaching.

Explore the source record for details and available documents.

Education, Dental↗
PubMedDate not supplied

Comparing two methods of moisture control in bonding to enamel: a clinical study.

Twelve patients provided a total of 36 teeth to be used in this study. Visible-light-cured composite resin tabs were applied to a flattened, acid-etched surface of each tooth. Half of the teeth were isolated with cotton rolls in conjunction with a saliva ejector; the other conjunction with a saliva ejector; the other half were isolated using a rubber dam. An equal number of teeth were treated in each group for each subject to serve as a self-control. After extraction the teeth were mounted and shear bond strength of the composite resin to enamel was determined on an Instron Testing Machine. There was a significant difference in the shear bond strength between the two experimental groups.

Acid Etching, Dental↗