Loomans B A C, Opdam N J M, Roeters F J M, Bronkhorst E M, Burgersdijk R C W, Dörfer C E
Department of Preventive and Restorative Dentistry, Radboud University Nijmegen Medical Centre, P.O. Box 9101, 6500 HB Nijmegen, The Netherlands.
J Dent. 2006 Apr;34(4):292-7. doi: 10.1016/j.jdent.2005.07.008. Epub 2005 Sep 12.
The objective of this study was to investigate clinical changes in proximal contact strength inserting Class II composite resin restorations according to one of three randomly assigned protocols.
Seventy-one Class II restorations (MO/DO) were placed by two calibrated operators. Restorations were randomly assigned to one of three groups: one using a circumferential and two a sectional matrix system with separation rings. Proximal contacts were measured by one independent observer with a Tooth Pressure Meter immediately before treatment, and directly after finishing the restoration.
Compared to the situation before treatment groups with a sectional matrix system resulted in a statistical significant stronger mean proximal contact strengths (p<0.05), whereas the use of a circumferential matrix system with hand-instrument resulted in a lower proximal contact strength (p<0.05).
Class II posterior composite resin restorations placed with a combination of sectional matrices and separation rings resulted in a stronger proximal contact than when a circumferential matrix system was used.
本研究的目的是根据三种随机分配方案之一，调查插入II类复合树脂修复体时近端接触强度的临床变化。
由两名经过校准的操作人员放置71个II类修复体（近中邻面/远中邻面）。修复体被随机分配到三组中的一组：一组使用环形，两组使用带有分离环的分段式成型片系统。由一名独立观察者在治疗前和修复完成后立即使用牙齿压力计测量近端接触情况。
与治疗前的情况相比，使用分段式成型片系统的组近端接触强度均值在统计学上显著更强（p<0.05），而使用手动器械的环形成型片系统导致近端接触强度较低（p<0.05）。
与使用环形成型片系统相比，使用分段式成型片和分离环组合放置的II类后牙复合树脂修复体近端接触更强。
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