fa Marginal quality of posterior microhybrid resin composite restorations applied using two polymerisation protocols: 5-year randomised split mouth trial پروتزهای دندانی Prothtodontics پژوهشي Research <p> <strong>Objectives</strong></p><p>  This randomised, split-mouth clinical study evaluated the marginal quality of direct Class I and Class II restorations made of microhybrid composite and applied using two polymerisation protocols, using two margin evaluation criteria. </p><p> <strong>Methods</strong> </p><p> A total of 50 patients (mean age: 33 years) received 100 direct Class I or Class II restorations in premolars or molars. Three calibrated operators made the restorations. After conditioning the tooth with 2-step etch-and-rinse adhesive, restorations were made incrementally using microhybrid composite (Tetric EvoCeram). Each layer was polymerised using a polymerisation device operated either at regular mode (600–650mW/cm2 for 20s) (RM) or high-power (1200–1300mW/cm2 for 10s) mode (HPM). Two independent calibrated operators evaluated the restorations 1 week after restoration placement (baseline), at 6 months and thereafter annually up to 5 years using modified USPHS and SQUACE criteria. Data were analyzed using Mann–Whitney U-test (α=0.05). </p><p> <strong>Results</strong> </p><p> Alfa scores (USPHS) for marginal adaptation (86% and 88% for RM and HPM, respectively) and marginal discoloration (88% and 88%, for RM and HPM, respectively) did not show significant differences between the two-polymerisation protocols (p>0.05). Alfa scores (SQUACE) for marginal adaptation (88% and 88% for RM and HPM, respectively) and marginal discoloration (94% and 94%, for RM and HPM, respectively) were also not significantly different at 5th year (p>0.05). </p><p> <strong>Conclusion</strong></p><p>  Regular and high-power polymerisation protocols had no influence on the marginal quality of the microhybrid composite tested up to 5 years. Both modified USPHS and SQUACE criteria confirmed that regardless of the polymerisation mode, marginal quality of the restorations deteriorated compared to baseline. </p><hr><p></p><p> <strong>Source: </strong>Journal of Dentistry</p><p><a href="http://www.jodjournal.com/article/S0300-5712(13)00054-7/abstract" target="_blank"><font color="#0000ff"> Full Text</font></a></p> Clinical study, Composite, Class I and II restorations, Marginal quality, SQUACE, Polymerisation, RCT, USPHS 0 0 http://idai.ir/browse.php?a_code=A-10-32-2150&slc_lang=fa&sid=1 Nixola Barabanti 100319475328460010095 100319475328460010095 No Department of Fixed and Removable Prosthodontics, University of Brescia, Brescia, Italy Massimo Gagliani 100319475328460010096 100319475328460010096 No Department of Fixed and Removable Prosthodontics, University of Milan, Milan, Italy Jean-François Roulet 100319475328460010097 100319475328460010097 No Department of Restorative Dental Sciences, College of Dentistry, University of Florida, Gainsville, USA Tiziano Testori 100319475328460010098 100319475328460010098 No Section of Implant Dentistry and Oral Rehabilitation Department of Odontology, Galeazzi Institute, IRCCS, University of Milan, Milan, Italy Mutlu Özcan 100319475328460010099 100319475328460010099 Yes Dental Materials Unit, Center for Dental and Oral Medicine, Clinic for Fixed and Removable Prosthodontics and Dental Materials Science, Zurich, Switzerland Antonio Cerutti 100319475328460010100 100319475328460010100 No Department of Fixed and Removable Prosthodontics, University of Brescia, Brescia, Italy