›› 2012, Vol. 3 ›› Issue (3): 139-141.

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Effect of microwave and water-bath post-polymerization treatments on cytotoxicity of two kinds of provisional restoration materials

  

  • Received:2012-07-23 Revised:2012-08-21 Online:2012-09-25 Published:2012-10-08

Abstract: Objective:To evaluate the effect of microwave and waterbath postpolymerization treatments on the cytotoxicity of twokinds of provisional restoration materials,polymethyl methacrylate and bisacryl composite resin. Methods:18 cylinders (10 mm in diameter and 2 mm in thickness)for assessing cytotoxicity were prepared in each material and divided into three groups,with 6 specimens in each. The three groups were microwava group,waterbath group,and control group. Specimens in the control group were leftuntreated. Specimens in microwave group were treated with microwave irradiation for 3 min at 500 W. In waterbath group,specimenswere submitted to immersion in water at 55°C for 30 min. Leaching liquor of the specimens was used to assess the cytotoxicity of cellsby means of methyltetrazolium test. Results:For polymethyl methacrylate material,the mean percentage viability of control group (47.6 ±3. 6)% was signifi cantly lower than those of microwave group (78. 4 ±4. 3)% and water bath group (54. 4 ±4. 3)% . There wassignificant difference between each pair of the three groups(P <0. 05). For bisacryl composite resin,there was no statistcally difference in the mean percentage of viability among the three groups(P >0. 05),and cytotoxic was in grade I. Conclusions:Microwave andwaterbath postpolymerization treatments can reduce the cytotoxicity of polymethyl methacrylate material significantly,while have littleeffect on the bisacryl composite resin.

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