Altunsoy, Mustafa Selçuk Üniversitesi - Dis Hekimliði Fakültesi, Ağız ve Diş Sağlığı Merkezi, Turkey , Botsalı, Murat Selim Selçuk Üniversitesi - Dis Hekimligi Fakültesi - Pedodonti Anabilim Dali, Turkey , Tosun, Gonca Karadeniz Teknik Üniversitesi - Fen-Edebiyat Fakültesi - Kimya Bölümü, Organik Kimya Anabilim Dalı, Turkey , Yaşar, Ahmet Karadeniz Teknik Üniversitesi - Eczacilik Fakültesi - Analitik Kimya Anabilim Dali, Turkey

Effect of different exposure times on the amount of residual monomer released from adhesive systems

26230

OBJECTIVE:The aim of this study was to evaluate the amount of residual monomer released from three different adhesive systems polymerized with four different exposure times. MATERIALS AND METHOD:The adhesives were applied onto dentin surfaces (length of an edge of 7 mm and 0.9 mm thickness) according to the manufacturer instructions, and polymerized using light curing unit (LED) for 10, 20, 40 and 60 seconds, respectively (n=5). After polymerization, each specimen was immediately immersed in lightproof glass bottle containing 75% ethanol and 25% deionized water at 37 oC. During the period of immersion, samples were removed from the bottles at 10 min, 1 h., 24 h., 7 d. and 30 d. by using micro-pipette. Residual monomers (Bis-GMA, UDMA) eluted from adhesives were analyzed with HPLC. The results were analyzed with one-way analysis of variance and Tukey HSD test. RESULTS: There was residual monomer release at all time periods. It was observed that the increase in the polymerization time did not have an effect on residual monomer release except for Clearfil S3 Bond (Bis-GMA) and Clearfil Photo Bond (UDMA) groups. CONCLUSION: Longer exposure times than those recommended by the manufacturers may decrease residual monomer release from some of the adhesives.

6

Adhesives , monomer , HPLC , polymerization

Acta Odontologica Turcica

12