RESUMO
Apicoectomy with retrograde amalgam is an accepted procedure for treating teeth that cannot be treated by nonsurgical methods. Some of these fail to heal for no apparent reason. Evidence is presented that indicates that some of these failures are caused by corrosion of the apical amalgam. Two cases are described in which the sinus tract that was associated with the failing retrograde amalgam was resolved without further surgery. To bring about the resolution, a zinc-enriched amalgam was placed in the crown that through an intervening conductor, reduced the rate of corrosion at the apex.
Assuntos
Apicectomia , Amálgama Dentário/efeitos adversos , Hipersensibilidade a Drogas , Obturação Retrógrada/efeitos adversos , Adulto , Corrosão , Eletroquímica , Eletrogalvanismo Intrabucal , Feminino , Humanos , Masculino , ZincoRESUMO
The minimal inhibitory concentrations of penicillin and six other antibiotics were determined for 66 oral black-pigmented Bacteroides isolates by using the National Committee for Clinical Laboratory Standards proposed standard agar dilution technique. These results plus iodometric determination of beta-lactamase activity showed that oral isolates of black-pigmented Bacteroides are remaining relatively susceptible to commonly used antibiotics.
Assuntos
Antibacterianos/farmacologia , Bacteroides/efeitos dos fármacos , Boca/microbiologia , Placa Dentária/microbiologia , Humanos , Testes de Sensibilidade Microbiana , PigmentaçãoRESUMO
Small, bimetallic couples were manufactured by condensing dental amalgam against a gold post which has been placed in polyethylene tubing. These devices were placed in rat tibias and osseous reactions were evaluated microscopically up to 112 days after surgery. The low current levels generated by the bimetallic couples used in this study did not affect the healing rate of the surgical osseous defect. Statistical analysis demonstrated that there were equal amounts of bone deposited at the anodes and cathodes of the experimental implants at all time intervals studied. The small currents produced by experimental implants did not interfere with the normal healing process, and the implications of this study in clinical situations are discussed.
