Avaliação in vitro de restaurações indiretas de composito em dentes deciduos : estudo do tratamento do substrato e agentes de fixação

AUTOR(ES)
DATA DE PUBLICAÇÃO

2005

RESUMO

The indirect restorations are an interesting restoration procedure in the pediatric dentistry clinic, because this leads to a reduced chairside time, besides would decrease polymerization shrinkage due to the resin luting agent lower volume. To endodontically treated teeth, the performance of adhesive restorations has already not been established, and this is extremely important since if restorations upon crowns failures, the pulp therapy can be lost. Then, the objectives presented in the dissertation form based in two articles were: (1) to evaluate the earlier marginal adaptation of onlay composite restorations in primary teeth subjected or not to 1% sodium hypochlorite (1% NaOCl) irrigation and bonded with two types of resin luting agents (EnForce e Rely X); (2) to evaluate the compressive strength of experimental groups studied in the first research and compare them with the sound teeth, besides to evaluate the types of fractures regarding to severity degree. In the first study, the sample was accomplished by forty sound molars restored with indirect onlay composite restorations. The teeth were divided into groups according the two factors of variations established in this study: 1% NaOCl irrigation and resin luting agents (EnForce and Rely X). To analyze the marginal adaptation a dye solution was applied upon restorations margins, and the dyed margins were considered as marginal gaps presence. TheImage Tool 3.0 software was used to measure the linear length. In the second study, the same sample of the study 1 was used with the addition of the control group accomplished the sound teeth, with the total of 50 teeth. All specimens were subjected to compression mechanic test, and the fractures types were macroscopically classified related to the severity degree. In the first study, there were no statistically difference related quantity of gaps among the groups (p>0.05), however, some groups showed the relative risk tendency of no gap higher than others, and the group treated with NaOCl and fixed EnForce (RR=1.56) produced the higher relative risk tendency. In the second study, there were no statistically differences related to compressive force values among any studied groups (p>0.05), consequently, the experimental groups had similar values to sound teeth. Concerning the severity of fractures, the experimental groups showed the most severe types of fractures, while the control group showed the lower severe types. Then, the composite indirect restored technique showed acceptable earlier marginal adaptation and recovery of the compressive strength of teeth with complex prepares and submitted to endodontic irrigation procedure

ASSUNTO(S)

sodium hypochlorite hipoclorito de sodio cimentos dentarios dental cements

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