Study on Reinforced Composite Resin Restorations by Inserting with Spherical Megafillers

我们之前报道过，将β石英玻璃陶瓷插入到复合树脂中，在体外大大降低了聚合收缩率和热膨胀系数。但是，为了避免在临床上暴露在修复体表面，巨填充器必须完全插入复合树脂内。本研究的目的是利用热机械分析仪（Thermofirex, Rigaku Co.）确定三种不同类型的复合树脂插入氧化铝或氧化锆陶瓷的球形陶瓷（φ1 mm）的热膨胀系数。每种复合树脂制备了三个圆柱形试样（φ4 mm×10 mm）。本研究使用的复合树脂为Clearfil AP-P高负载型复合树脂、Palfique Estelite亚微填充型复合树脂和Heliomolar Rediopaque微填充型复合树脂。37℃水中保存48小时，37℃烘箱干燥。一次，试样g…More逐渐升温至90℃，并逐渐冷却至20℃。再次，试样在热-机械分析仪中均匀升温至90℃。在35℃~ 80℃范围内用直线法测定了热膨胀系数。结果如下：含10%氧化铝的Clearfil AP-X为25.3×10, 30%氧化铝为23.3。×10, 50%-22.4×10，而0%表示36.7×10。添加10%氧化铝的Palfique Estelite为54.8、30% ~ 49.2、50% ~ 43.4，而添加0%氧化铝的Palfique Estelite为64.2。10%氧化铝的日摩尔辐射不透性为73.8、30% ~ 66.2、50% ~ 62.2，而0%氧化铝的日摩尔辐射不透性为76.0。0%氧化锆的Clearfil AP-X分别为36.7、10% ~ 57.3、30% ~ 43.0、50% ~ 33.4。0%氧化锆的日摩尔透性分别为76.0、10% ~ 67.5、30% ~ 58.1、50% ~ 47.1。随着球形陶瓷填料数量的增加，热膨胀系数降低，氧化锆陶瓷的热膨胀系数优于氧化铝陶瓷。使用光泽度计（VG-2000, Nippon Denshoku Co.）测量表面光泽度。以60的入射角和60的接受度进行表面光泽度测量。复合材料的表面光泽度与未添加微填料的复合材料相同。当我们在临床上应用时，我们对深度超过1.5 mm的空腔没有问题。预先用复合树脂膏对空腔地板进行了较薄的铺设。在不使用镊子的情况下，在填充仪的尖端一次性粘上几个微粒插入复合树脂中。用沉默偶联剂处理过的填料与复合材料粘合良好。结果表明，用球形陶瓷填充器置入增强复合材料修复体在临床上是非常有用的。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