Bioactivity and marginal adaptation of light-curing resin-modified MTA cement

none5Objectives: calcium-silicate MTA (Mineral Trioxide Aggregate) cement have been modified by adding HEMA and TEGMA resin to obtain an experimental light-curing root-end filling material. The hypothesis of the study was that light-curing resin-modified calcium-silicate cements (lc-MTA) possess bioactivity properties comparable to conventional MTA cements, such as ProRoot MTA (DentSply, USA). Methods: HEMA, TEGMA and photo-activator were added to a tricalcium-silicate/dicalcium silicate powder. Extracted single-rooted human teeth were instrumented with ProTaper rotary instruments and filled with single-cone gutta-percha technique. Apex was sectioned and a root-end cavity was created by ultrasonic instruments. Root-end fillings were made using ProRoot MTA or the experimental light-curing cement. All samples were then aged in simulated body fluid solution (DPBS) at 37°C for 24-hours and 1 month. Surface morphology and marginal adaptation of cements were evaluated by ESEM. Bioactivity was evaluated by EDX, RAMAN and FTIR analyses after 10 minutes, 24 hours and 1 month from their preparation. Results: ESEM analysis of fresh and aged samples revealed a good marginal adaptation of both cements. EDX showed Ca and Si peaks on fresh samples, and Ca and P peaks on 24-hours and 1- month aged samples. Diffuse deposits of apatite spherulites were detected on the surface of both aged cements. Apatite deposits filled the margin of the restoration and coated the root dentin surface. RAMAN and FTIR displayed calcium hydroxide bands on 24-hours samples and apatite bands on aged samples of both cements. Conclusions: the study confirmed the optimal sealing ability and the bioactivity of ProRoot MTA and lc-MTA cements. Resin-modified MTA kept the ability to form superficial apatite deposits and to improve marginal sealing ability.noneM.G. GANDOLFI; F. SIBONI; S. CHERSONI; P. TADDEI; C. PRATIM.G. GANDOLFI; F. SIBONI; S. CHERSONI; P. TADDEI; C. PRAT