Microleakage study of CEREC III restorations

ObjectiveThe purpose of this study is to investigate the effect of three resin cements on the adaptation of CEREC III (Ceramic Reconstruction) and to measure the degree of microleakage between resin cement and tooth structure and also between resin cement and CEREC III restorations which fabricated by using CAD/CAM system and luting them at the same time.Materials and methodsTwenty-four cavities were prepared (Inlay) on the mesial-occlusal-distal surfaces of twenty-four human freshly extracted premolars. CEREC III (Sirona) is used to prepare ceramic restorations by milling blocs (Vita Blocs Esthetic Line for CEREC/inlab German made) with 1M1 shade and K12. Suitable Ceramic restorations for cavities were obtained.All samples of ceramic restorations were divided into three groups and were cemented with three types of luting resin cement as the following: Bistite II DC, Perma Flo DC and Multilink Automix, then the Plasma Arc light cure unit was used to cure cement. All restorations were finished and immersed in 0.5% basic fuchsine solution for 24 h. The specimens were cut in the mesio-distal direction and then evaluated for microleakage.ResultsThe data were analyzed using chi-square statistical test with significance 0.05. A relationship between the degree of microleakage and the type of cement at interface tooth structure/luting cement has been found. No statistical difference was found between the type of cement and microleakage degree at interface luting cement/CEREC III restoration.ConclusionIt was concluded that the degree of microleakage at interface CEREC III restoration/resin cement was less than microleakage at interface resin cement/tooth structure.