Watson T F
Department of Conservative Dentistry, United Medical School, Guys Hospital, London, England.
J Dent Res. 1990 Aug;69(8):1531-8. doi: 10.1177/00220345900690081701.
Vitrabond consists of a conventional glass ionomer, in conjunction with a light-curing resin and hydroxy-ethylmethacrylate. This study, which used a tandem scanning reflected light microscope for confocal imaging, looked at factors affecting the adaptation of this material to tooth tissue. Wedge-shaped cervical cavities were cut and restored in three ways: (1) Vitrabond was applied as a thin sub-base and either extended onto the enamel margin or kept clear of it. P50 resin composite was then placed, following phosphoric-acid-etching of the enamel margins. (2) The dentin surfaces were conditioned with Scotchprep (maleic acid), then with the Vitrabond, the enamel was etched, and the Scotchbond 2 adhesive applied prior to addition of the P50. (3) Vitrabond was applied alone in bulk, with and without Scotchprep acid-dentin conditioning with a 1:1 (normal) and 3:1 powder:liquid ratio (P:L). Adaptation of the Vitrabond was excellent when maleic acid was used for conditioning of the dentin. When the Vitrabond was used with P50 but extended onto the enamel, the enamel margin occasionally failed. Enamel invariably fractured when the Vitrabond was used alone in bulk. An increase in the P:L ratio decreased contraction gaps when the dentin was not conditioned, but Vitrabond failed cohesively when the dentin was conditioned. The Vitrabond was very susceptible to shrinkage on dehydration. This study suggests that Vitrabond should only be applied to dentin in thin layers, should not be extended onto enamel margins, and should not be allowed to dehydrate. Maleic acid conditioning of the dentin improved adaptation.
Vitrabond由传统玻璃离子体与光固化树脂和甲基丙烯酸羟乙酯组成。本研究使用串联扫描反射光显微镜进行共聚焦成像，观察了影响该材料与牙齿组织贴合的因素。制备了楔形颈部洞并采用三种方式进行修复：（1）将Vitrabond作为薄的底层材料应用，要么延伸至釉质边缘，要么不接触釉质边缘。然后在对釉质边缘进行磷酸酸蚀后放置P50树脂复合材料。（2）先用Scotchprep（马来酸）处理牙本质表面，再用Vitrabond处理，蚀刻釉质，在添加P50之前涂抹Scotchbond 2粘结剂。（3）单独大量应用Vitrabond，有或没有用Scotchprep进行酸蚀牙本质预处理，粉液比为1:1（正常）和3:1。当使用马来酸处理牙本质时，Vitrabond的贴合效果极佳。当Vitrabond与P50一起使用并延伸至釉质时，釉质边缘偶尔会出现贴合失败。当单独大量使用Vitrabond时，釉质总是会断裂。当牙本质未处理时，增加粉液比会减小收缩间隙，但当牙本质经过处理时，Vitrabond会发生内聚性破坏。Vitrabond在脱水时极易收缩。本研究表明，Vitrabond应仅以薄层应用于牙本质，不应延伸至釉质边缘，且不应使其脱水。用马来酸处理牙本质可改善贴合效果。
