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Microleakage of Class II composite using different etching techniques | ||
| Journal of baghdad college of dentistry | ||
| Article 1, Volume 21, Issue 1, 2009, Pages 46-48 | ||
| Author | ||
| Zainab M. Abdul-Ameer | ||
| Abstract | ||
| ABSTRACTBackground: Microleakage in the gingival floor of class II composite restorations can compromise the marginaladaptation of the filling material to the cavity edges. The aim of this study was to evaluate the effect of differentetching techniques on Microleakage of class II Composite filling.Materials and methods: Sixty extracted caries-free human premolars were randomly divided into six groupsaccording to etching technique. In group A and B the dentin of the cavities were etched with 35% phosphoric acidgel, in group C and D the dentin of the cavities were irradiated using a 320 μm Nd: YAG laser beam, in group E and Fthe dentin surfaces were initially treated with the laser and then etched as in group A and B with 35% phosphoricacid. Proximal class II cavities were prepared in all samples with the gingival floor one millimeter below the CEJ.Cavities were restored according to research protocol. The samples were subjected to 2500 thermal cycles (5-55oC),immersed in 0.5% basic fuchsine solution, embedded in epoxy resin and cut centrally. Microleakage was scored andcollected data were statistically analyzed using one way analysis of variance.Results: More microleakage was detected in group C (p<0.05; variance analysis). The laser beam and acid-etchingshowed no advantage compared to the acid-etching alone (p>0.05). Using the incremental technique significantlydecreased microleakage (P<0.02).Conclusion: The Nd: YAG laser irradiation in cl II composite does not constitute an alternative to acid-etching. .Samples restored with the incremental technique, and cavities etched with 35% phosphoric acid gel had the leastdye penetration and microleakage.Keywords: Acid etching, Nd: YAG laser, resin composite. (J Bagh Coll Dentistry 2009; 21(1): 46-48) | ||
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