Study on Reinforced Composite Resin Restorations by Inserting with Spherical Megafillers

我们以前曾报道，将Beta石英微晶玻璃镶件插入复合树脂中，大大降低了聚合收缩和体外热膨胀系数。但是，在临床上，为了避免修复体面暴露，必须将巨型填料完全插入复合树脂内。本研究的目的是用热机械分析仪(ThermoFirex，Rigaku Co.)测定三种不同类型的复合树脂在氧化铝或氧化锆陶瓷(φ1 mm)球状陶瓷载体中的热膨胀系数。每种复合树脂制备3个圆柱形试件(φ为4 mm×10 mm)。本研究使用的复合树脂为高负载型复合树脂Clearfi AP-P、亚微米级填充树脂Palfique Estite和微米级填充复合材料Heliomol Rediopque。样品在37℃的水中保存48小时，并在37℃的烤箱中干燥。有一次，标本g…更持久地加热到90℃，然后逐渐冷却到20℃。再次，样品在热机械分析仪中均匀升高至90℃。在35℃~80℃范围内，用直线法测量热膨胀系数。研究结果如下。含10%氧化铝的Clearfi AP-X为25.3×10，30%氧化铝为23.3×10，50%-22.4×10，0%为36.7×10；10%氧化铝为54.8，30%-49.2，50%-43.4，0为64.2。含10%氧化铝的太阳光透射率分别为73.8%、30%~66.2%、50%~62.2%，而0%为76.0%。含0%氧化锆的Clearfil AP-X分别为36.7、10%-57.3、30%-43.0、50%-33.4。含0%氧化锆的太阳摩尔不透射率分别为76.0、10%-67.5、30%-58.1、50%-47.1。热膨胀系数随球形陶瓷超细颗粒数量的增加而减小，且氧化锆陶瓷的热膨胀系数比氧化铝陶瓷的效果更好。使用光泽度计(VG-2000，日本电装株式会社)测量表面光泽度。表面光泽度测量采用60%的入射角和60%的接受度。复合材料的表面光泽度与未添加超细粒子的复合材料的光泽度相同。当我们在临床上应用时，我们对深度超过1.5 mm的空洞没有问题。事先用复合树脂糊料将空洞底板铺得更薄。在不使用镊子的情况下，几个巨型填料颗粒一次粘在插入复合树脂的充填工具的尖端。硅烷偶联剂处理的Megafillers与复合材料结合良好。结论：球形陶瓷磁铁镶嵌增强复合修复体具有良好的临床应用价值。较少

We have previously reported that the insertion of Beta Quartz Glass Ceramic inserts into a composite resin greatly reduced the polymerization shrinkage and the coefficient of thermal expansion in vitro. But, The megafiller has to be inserted completely inside the composite resin to avoid exposing megafiller on the surface of the restoration clinically. The purpose of this study was to determine the coefficient of thermal expansion of three different types of composite resins inserted with the spherical ceramic megaffiler (φ1 mm) of alumina or zirconia ceramics using a thermomechanical analyzer (Thermofirex, Rigaku Co.). Three cylindrical specimen (φ4 mm×10 mm) of each of the composite resins were prepared. The composite resins used in this study were Clearfil AP-P as highly loaded type composite, Palfique Estelite as submicrofilled composite and Heliomolar Rediopaque as microfilled composite. The specimen was kept in 37℃ water for 48 hours and dried in oven at 37℃. Once, the specimen g … More radually heated up to 90℃ and gradually cooled down to 20℃. Again, the specimen uniformly raised up to 90℃ in the thermomechanical analyzer. The coefficient of thermal expansion was measured at the range of 35℃〜80℃ with a straight line. Results are as follows. Clearfil AP-X with 10% alumina showed 25.3×10, 30% alumina was 23.3.×10, 50%-22.4×10, whereas 0% showed 36.7×10. Palfique Estelite with 10% alumina showed 54.8, 30%-49.2, 50%-43.4, whereas 0% showed 64.2. Heliomolar Radiopaque with 10% alumina showed 73.8, 30%-66.2, 50%-62.2, whereas 0% showed 76.0. Clearfil AP-X with 0% zirconia showed 36.7, 10%-57.3, 30%-43.0, 50%-33.4. Heliomolar Radiopaque with 0% zirconia showed 76.0, 10%-67.5, 30%-58.1, 50%-47.1. The coefficient of thermal expansion reduced as increasing amount of spherical ceramic megafillers, and zirconia ceramics was more effective than alumina ceramics. Surface gloss was measured using a gloss meter (VG-2000, Nippon Denshoku Co.). Surface gloss measurement was undertaken with 60 of the angle of incidence and 60 of the acceptance. Surface gloss of the composites were given as same as the gloss of composites without megafillers. When we applied clinically, we have no problem on the cavity deeper more than 1.5 mm. The cavity floor was laid thinner with composite resin paste beforehand. Several particles of megafillers sticked once at the tip of filling instrument inserted into the composite resin without use of tweezers. Megafillers treated with silance coupling agent well bonded to composite. It was concluded that the reinforced composite restoration by inserting with spherical ceramic magafillers was very useful clinically. Less