三种暂时冠桥树脂材料的力学性能研究

Mechanical properties of three provisional crown and bridge resin materials

目的比较3种暂时冠桥树脂材料的力学性能,为临床选用材料提供实验参考。方法3种被测试材料分别为半永久冠桥树脂材料LuxaCrown、普通冠桥树脂材料Protemp 4和MB自凝塑料。参照标准推荐的模具分别制备用于弯曲强度和弯曲模量测试用的条状试样(2.0 mm×2.0 mm×25 mm),用于压缩强度测试用的圆柱状试样(直径4.0 mm,高8 mm)和用于断裂韧性测试的单边缺口梁试样(5.0 mm×2.5 mm×25 mm,缺口深度2.5 mm),每种材料制备各10个试样。在拉力试验机上以1.0 mm/min的加载速度进行测试。结果3种材料(LuxaCrown、普通冠桥树脂材料Protemp 4、MB自凝塑料)的弯曲强度分别为(110.35±10.94)MPa、(97.21±11.59)MPa、(49.43±11.63)MPa,弯曲模量分别为(2.46±0.17)GPa、(2.24±0.15)GPa、(2.09±0.19)GPa,压缩强度分别为(303.22±14.13)MPa、(279.21±12.54)MPa、(214.87±12.43)MPa,断裂韧度分别为(1.30±0.12)MPa·m^(1/2)、(1.16±0.13)MPa·m^(1/2)、(1.10±0.14)MPa·m^(1/2)。结论半永久冠桥树脂材料LuxaCrown的力学性能最高,其次是普通冠桥树脂材料Protemp 4,MB自凝塑料的力学性能最差。

Objective The aim of this study was to compare the mechanical properties of three typical provisional crown and bridge resins including one semi-permanent(LuxaCrown),one temporary(Protemp 4)and one conventional self-curing methacrylate-based resin(MB).Methods Bar-type specimens(2.0 mm×2.0 mm×25 mm)for three-point bending test,single-edge notched beam specimens(5.0 mm×2.5 mm×25 mm,notch depth 2.5 mm)for fracture toughness test and cylindrical specimens(φ4.0 mm×8.0 mm)for compression test were fabricated according to ISO 10477 and ISO 1358.After being immersed in water at 37℃ for 24 h,all specimens were test in a universal testing machine at a crosshead speed of 1.0 mm/min.Maximal loads to fracture in Newtons were recorded.Flexural strength(FS),flexural modulus(FM),compressive strength(CS)and fracture toughness(FT)were calculated.Results The FS of the three materials were(110.35±10.94)MPa,(97.21±11.59)MPa,(49.43±11.63)MPa respectively,the FM were(2.46±0.17)GPa,(2.24±0.15)GPa,(2.09±0.19)GPa respectively,the CS were(303.22±14.13)MPa,(279.21±12.54)MPa,(214.87±12.43)MPa respectively,the FT were(1.30±0.12)MPa·m^(1/2),(1.16±0.13)MPa·m^(1/2),(1.10±0.14)MPa·m^(1/2)respectively.Conclusion Semi-permanent crown and bridge resins LuxaCrown are stronger than temporary crown and bridge resins Protemp 4,and conventional self-curing methacrylate-based resin(MB)is the weakest among the three materials.