Brosh T, Baharav H, Gross O, Laufer B Z
Department of Oral Rehabilitation, Maurice and Gabriela Goldschleger School of Dental Medicine, Tel Aviv University, Israel.
J Prosthet Dent. 1997 Jun;77(6):573-7. doi: 10.1016/s0022-3913(97)70097-0.
The aim of this study was to determine the influence of different surface loadings during curing with various irradiation times on hardness and diametral tensile strength of a light-cured composite.
A mold was fabricated to allow loading during curing of cylindrical specimens of a composite. Four surface loadings of 0, 0.35, 0.87, and 1.73 MPa and four irradiation times of 20, 40, 60, and 180 seconds were used (n = 15). Each specimen was subjected to a microhardness test and to a diametral tensile strength test.
Surface loading during curing affected both hardness and strength properties, whereas irradiation time influenced only the hardness of the material. Both parameters gained between 15% and 20% improvement when the material was loaded with 0.87 MPa surface pressure and cured by 60-second irradiation time. Higher loading or longer irradiation times did not improve these properties.
Loading composite during curing improves its mechanical properties, probably through decreasing flaws and air voids of the material.
本研究的目的是确定在不同照射时间固化过程中不同表面载荷对光固化复合材料硬度和径向拉伸强度的影响。
制作一个模具，以便在复合材料圆柱形试件固化过程中进行加载。使用了0、0.35、0.87和1.73MPa这四种表面载荷以及20、40、60和180秒这四种照射时间（n = 15）。对每个试件进行显微硬度测试和径向拉伸强度测试。
固化过程中的表面载荷影响硬度和强度性能，而照射时间仅影响材料的硬度。当材料在0.87MPa表面压力下加载并通过60秒照射时间固化时，这两个参数均提高了15%至20%。更高的载荷或更长的照射时间并未改善这些性能。
固化过程中对复合材料加载可能通过减少材料中的缺陷和气孔来改善其机械性能。
