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Biomedical subjects

A Schulman

Publications and source records attributed to A Schulman.

134 records · Page 8Linked to original sources
PubMedDate not supplied

Addition of fresh amalgam to existing amalgam: microleakage study.

The purpose of this in vitro study was to determine whether adhesive lining materials reduce microleakage in amalgam restorations, and to observe the degree of microleakage at the interface between freshly placed (new) and existing (old) amalgam. Forty-eight specimens were used in the experimental groups. The materials used to study microleakage in this investigation were: copal varnish, a dentin bonding agent (Clearfil New Bond), and a 4-META adhesive (Amalgambond). No significant difference in microleakage was found at the interfaces between freshly placed and existing amalgam. Significantly less microleakage was noted in specimens using the 4-META adhesive and the dentin bonding agent as compared to specimens in which no lining material was placed. Significantly less microleakage was noted in specimens using the 4-META adhesive compared to specimens using cavity varnish.

Analysis of Variance↗
PubMedDate not supplied

Addition of fresh amalgam to existing amalgam utilizing various adhesive liners: a SEM study.

The purpose of this study was to observe the interfaces between (1) dentin and amalgam and (2) freshly placed amalgam and existing amalgam using various adhesive liners. Specimens were randomly assigned to four equal groups for liner placement: Group I--control, no liner used; Group II--copal varnish; Group III--4-META adhesive; Group IV--dentin bonding agent. After liner placement and amalgam replacement, specimens set for 24 hours and were then thermocycled in 0.5% basic Fuchsin dye, sectioned, and SEM analyses performed. Microgaps appeared in a disjointed fashion at the interface between freshly placed and existing amalgam. The 4-META adhesive appeared to establish a bond between amalgam and tooth structure and, thus, diminished the microgap between amalgam and dentin.

Composite Resins↗
PubMedDate not supplied

Gold-nickel alloys in dental prostheses.

A gold-nickel master alloy was prepared by arc melting in an inert atmosphere and from it, mechanical test specimens and dental prostheses were made by centrifugal casting. The cast alloy had a yield strength of about 7,400 kg/cm2, with an elongation of 12%. The alloy was clinically tested in the form of partial dentures and crown and bridge materials. For the 32-month period these prostheses have been in use, no tissue reaction, tarnish, or corrosion had been observed.

Crowns↗
PubMedDate not supplied

Halothane induced porcine malignant hyperthermia reversed by dantrolene.

Malignant hyperthermia (MH) was observed in three cases of Halothane anesthesia performed in six littermate pigs. In two pigs, MH was totally reversed by the intravenous administration of Dantrolene 2 or 3 mg/kg. In one pig, an injection of 2 mg/kg reversed the MH symptoms transiently Dantrolene had no effect on the serum lactate values elevated in the MH-positive pigs. The therapeutic use of Dantrolene appears to be indicated in the stress-susceptible pigs.

Animals↗