RIBEIRO, Marina Arcoverde et al. The insertion technique's influence of compositeresin on the microleakage in occlusal esthetic restorations. Odontol. Clín.-Cient. (Online) []. 2010, 9, 4, pp. 345-348. ISSN 1677-3888.

The aim of this study was to evaluate the influence of the insertion technique of composite resin on the microleakage of occlusal restorations. Occlusal cavities in 60 human molars were restored according to the following groups: 1 - Filtek Z350^TM/3M ESPE; 2 - Ice^®/ SDI and 3 - Concept Advantage ^® / Vigodent; subdivided into: A - Technique of incremental insertion and B - cruciform Insertion Technique. The specimens were toexposed: heat stress (500 cycles, 5 º C + / - 1 and 55 º C + / -1); exposure to the chemical tracer (AQT); sectioning and examination (25X stereomicroscope) for assigning scores from 0 (no penetration of AQT) to 2 (maximum penetr ation of AQT). The results showed the highest per centages for the sc ore 0 for 3-B (80.0%), 2-A (75.0%), 2-B (75.0%), 1-A (70.0%). Ther e were statistically significant differences in groups 1 and 3, which did not occur in group 2 (Mann-Whiteny and Kruskal-Wallis / significance level of 5%). It was concluded that no technique of inser tion was able to prevent microleakage and the cruciform technique represents an alternative to the incremental technique depending on the type of composite resin used.

: polymerization contraction; insertion technique; composite resins.