Objectives: The purpose of this study was to analyze the marginal adaptation of resin composite restorations in class II cavities after using a special kind of cavity standardisation. Methods: 30 class II cavities were prepared under use of an six-axes-industrial-robot (RV-E4NM/Mitsubishi Electric) in freshly extracted human molars; the proximal box ended more than 1 mm above the cemento-enamel-junction. The margins and bevels were also standardized by using an sonic preparation system (Sonic Sys/KAVO). After the use of a conventional phosphoric acid pretreatment the cavities were covered with the adhesiv bonding-system recommended by the manufacturer of the composite material. A metal matrix was adapted to the prepared tooth before the incremental insertion of Filtek Supreme/3M ESPE (Group I), Point 4/KERR (Group II), In Ten-S/IVOCLAR VIVADENT (Group III), Filtek Z250/3M ESPE (Group IV) or Herculite XRV/KERR (Group V). Dye penetration of the marginal adaptation was examined before und after mechanical load (250 N, 2.400 cycles) under stereo-binocular microscopy at 10-fold magnification. Comparison of the cavities showed a high conicidence of cavity forms. Results: Gap-free margins of the enamel-restoration interface was found in 96,7% (Group I), 99,0% (Group II), 95,4% (Group III), 99,1% (Group IV) and 98,8% (Group V). Data were statistically analysed using one-way ANOVA with Scheffé test. Significant differences could not be found. Conclusions: The use of a robot system for the cavity preparation offers the possibility of standardization the cavity forms on high level in human molars. The results of the marginal adaptation during the use of conventional acid treatment and incremental filling technique are with those of the recent studies comparable.

Back to the Dental Materials: II - Adhesion-Other Program
Back to the 81st General Session of the International Association for Dental Research (June 25-28, 2003)

Top Level Search