Evaluation of Proximal Contact Tightness of Posterior Composite Resin Restorations

Project no. 21620 · Status: Kapanmış (Yayın bekleniyor) · 2020

Summary

Aim: The purpose of this study is to evaluate the influence of matrix system on proximal contact tightness (PCT) of posterior composite resin restorations.Materials and Methods: Standardized class II cavities (Occluso-distal “OD” and Occluso-mesial “OM”) on first lower molar dentiform model teeth (Frasaco, GmbH, Germany) were prepared. Seventy-five teeth randomly assigned into three study groups and restored with direct resin composite (Charisma Topaz, Heraus Kulzer, Germany) using different matrix system; Gr-1: Ivory matrix (Hahnenkratt GmbH, Germany), Gr-2: Omni matrix (Ultradent, USA), and Gr-3: Palodent V3 sectional matrix (Dentsply, USA). In all the groups, the matrix band was secured using a wooden wedge except for the Palodent group, following manufacturer's recommendations. All the prepared teeth were restored with resin composite mounted in a manikin head to simulate the clinical environment. Proximal contact tightness (PCT) was measured using a custom-made tooth pressure meter designed by Ege University Faculty of Engineering Department of Mechanical Engineering. Validation of the PCT results has been performed with bite-wing radiography which were taken from all samples and a sound frasaco tooth. The contact surface area was measured by evaluating the pixel volume on histogram (CS5 Photoshop, Adobe, USA). All data were statistically analyzed by ANOVA, and t-test in SPSS software (p<0.05).Results: The sectional matrices applied together with the separation rings, independent of the wedge, showed statistically significantly tighter contact values than the samples using the Ivory matrix system (p<0.05). Palodent matrix (PM) applied with anatomical band and wedge showed statistically significantly tighter contacts on both mesial (PCTm: 228.28 ± 59.17N) and distal surfaces (PCTd: 254.91 ± 65.69N) (p >0.05). While both Ivory matrix (PCTm: 74.65 ± 19.18N) and Omni matrix (PCTm: 145.96 ± 40.80N) formed a tighter contact on mesial surfaces, distal contacts were found to be significantly tighter than mesial contacts only in Palodent group (p). <0.05). There was no statistically significant difference between the mesial and distal areas in the ivory matrix group (p>0.05). According to the histogram results, there was a significant difference between the mesial and distal areas only in the Palodent group (p<0.05), while there was no difference between the other groups (p>0.05). Histogram results confirmed that the tightest contact values were achieved in the Palodent group, followed by Omnimatrix and Ivory matrix (p<0.05).Conclusion: In Class II resin composite restorations, the use of sectional matrix systems and separation rings is more effective in creating a tighter contact than conventional matrix systems. In addition, the use of anatomical wedges will help to create a more natural approximal contour.

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