Chung K H, Greener E H
Dental Department, Veterans General Hospital, School of Dentistry, National Yang-ming Medical College, Shih-pai, Taipei, Taiwan.
J Oral Rehabil. 1990 Sep;17(5):487-94. doi: 10.1111/j.1365-2842.1990.tb01419.x.
The degree of conversion, filler concentration and mechanical properties of seven proprietary light-cured posterior composite resins were investigated. The degree of conversion of composites ranged from 43.5-73.8%. The weight fraction of filler that was obtained was in the range 66.4-85.2%. The volume fraction varied from 58.2-74.2%. The mean values of the observed compressive and diametral tensile strengths ranged from 242.3-324.7 MPa and from 39.8-62.6 MPa, respectively. The Knoop hardness numbers ranged from 41.8-81.9. Significant correlations were observed between the volume fraction of filler and the diametral tensile strength (r = 0.89), and between the volume fraction of filler and the Knoop hardness number (r = 0.89). No correlation was found between the degree of conversion and any of the mechanical properties of the composite resins tested. Because of the positive correlations between the volume fraction of filler and the diametral tensile strength, and between the volume fraction of filler and the Knoop hardness numbers, it is concluded that the filler concentration plays a prominent role in determining the properties of contemporary posterior composite resins.
对七种专利光固化后牙复合树脂的转化率、填料浓度和机械性能进行了研究。复合材料的转化率在43.5%-73.8%之间。获得的填料重量分数在66.4%-85.2%范围内。体积分数在58.2%-74.2%之间变化。观察到的压缩强度和径向拉伸强度的平均值分别在242.3-324.7MPa和39.8-62.6MPa之间。努氏硬度值在41.8-81.9之间。观察到填料体积分数与径向拉伸强度之间存在显著相关性（r = 0.89），以及填料体积分数与努氏硬度值之间存在显著相关性（r = 0.89）。在所测试的复合树脂的转化率与任何机械性能之间未发现相关性。由于填料体积分数与径向拉伸强度之间以及填料体积分数与努氏硬度值之间存在正相关，因此得出结论，填料浓度在决定当代后牙复合树脂的性能方面起着重要作用。
