Composite Matrix System — ORE Part 1 MCQ

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EasyRestorative DentistryComposite Matrix SystemORE Part 1

A patient requires a composite restoration on the mesial surface of an upper premolar. Which matrix system is most appropriate?

Educational content. Not a substitute for clinical judgement or local policy.

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Correct answer: A — Sectional matrix system with a separation ring

Explanation lettering: D = shown as C · C = shown as D

For Class II composite restorations including mesial surfaces, the sectional matrix system with a separation ring (option A) is the evidence-based gold standard. Current systematic reviews confirm that sectional matrices produce significantly tighter and more stable proximal contacts than circumferential systems (Tofflemire, copper band, Ivory retainer). The separation ring provides essential tooth separation and stabilisation, preventing matrix band distortion during composite placement. Option B (Tofflemire) is a circumferential matrix—historically favoured but now known to yield inferior proximal contacts. Options C and D are outdated circumferential approaches with similar limitations. Option E is clinically incorrect: matrices are essential for establishing anatomically correct proximal contours and contact areas. The sectional system combines flexibility (allowing adaptation to individual tooth anatomy) with superior contact reproducibility—the key discriminant within Easy-difficulty restorative practice.

Reference: The Effectiveness of Circumferential and Sectional Matrix Systems in Obtaining Optimum Proximal Contact in Class II Composite Restorations: A Systematic Review. NCBI/PMC, 2024. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC12204051/