Evaluation of Proximal Contact Tightness of Class II Resin Composite Restorations

Abstract

The use of separation rings with sectional matrices provides superior contacts when placing Class II RCRs.

Influence of Volumetric Shrinkage and Curing Light Intensity on Proximal Contact Tightness of Class II Resin Composite Restorations: In Vitro Study

“…The validity of this model was demonstrated by Loomans and others 6 and Saber and others, 19 where it was concluded that the in vitro model is representative of the clinical situation. Natural tooth movement cannot be reproduced in a laboratory setting.…”

“…This can be best achieved by using separation rings. [5][6][7]19 Nevertheless, this study showed that type of composite, possibly volumetric shrinkage, and intensity of polymerization light influence proximal contact tightness. However, a direct cause-and-effect relationship between shrinkage and contact tightness was not established.…”

“…Proximal contact tightness was measured using the Tooth Pressure Meter, a device that is constructed at the University of Technology Delft in the Netherlands and was previously used in other in vitro studies. [6][7][8]19 This device uses a 0.05-mm-thick metal strip that is inserted interdentally from an occlusal direction. The tightness of the proximal contact is quantified as the maximum frictional force (N) when the strip is removed in the occlusal (vertical) direction.…”

Comparison of Proximal Contact and Contours of Premolars restored with Composite Restoration using Circumferential Matrix Band with and without Separation Ring: A Randomized Clinical Trial

“…Comparison of the proximal contact tightness of the two study groups; Chi-square test is applied; the level of significance was set at 5%; *Statistically significant difference; df: Degree of freedom Comparison of the two study groups with respect to proximal contours and overhang formation; Chi-square test was applied and the level of significance was set at 0.05 There is a strong evidence base in favor of employing separation ring for class II composite restorations. The studies [4][5][6][11][12][13][14][15][16] in this regards actually recommend using separation ring in combination with sectional matrices. But it is not clear whether the positive results (tight contact) achieved by sectional matrix-separation ring assembly is attributed to the matrix or to the separation ring.…”

“…It has always remained a challenge for the dentists to obtain tight proximal contact with composites. 4 The clinical procedure of the proximal composite restoration has to compensate for the thickness of the matrix band as well as the polymerization shrinkage of the restorative material. 5 It was thought that employing thick consistency-packable composite could solve the problem but the 'packability' of the composite material has failed to achieve better contacts.…”