Amalgam Research Today is a free monthly online journal that collates and summarizes the latest research about Amalgam, including details on dental fillings, dentistry, side-effects. | ||||||||
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An in vitro study on the use of circumferential matrix bands in the placement of Class II amalgam restorations.Gilmour AS, James T, Bryant S, Gardner A, Stone D, Addy LD Department of Adult Dental Health, Cardiff University School of Dentistry, Heath Park, Cardiff, CF14 4XY. gilmour@cardiff.ac.uk OBJECTIVE: To compare the effectiveness of a disposable metal matrix band system and the Siqveland matrix system in the restoration of a Class II preparation with amalgam. To assess the difference in amalgam overhang produced between the two systems in vitro. METHODS: A right maxillary first premolar with a Class II cavity preparation was duplicated in acrylic to produce a standardized cavity. Forty acrylic teeth were individually mounted in a hand-held model of an upper right quadrant and restored with amalgam by twenty dentists. Each dentist restored two replica teeth with amalgam; one using the Omni-matrix system and the other using the Siqveland matrix system. All 40 restored teeth were individually mounted on a standardised jig, viewed under a microscope, photographed and overhangs, if present, measured using Image ProPlus 4.0. A comparison of the overhangs produced by the two systems was analysed using a paired sample t-test. RESULTS: An overhang was present in all cases. There was a significant difference in the size of the overhangs produced by the two different matrix systems (p-value 0.036). The Siqveland produced a larger overhang than the Omni-matrix system. CONCLUSION: A commonly used matrix band (Siqveland), when compared to a newer, disposable system (Omni-matrix), was found to result in consistently larger overhangs during the restoration of class II preparations with amalgam. As Omni-matrix is a disposable system, the potential for cross-contamination is removed and it can, therefore, be considered a suitable replacement for the non-disposable Siqveland matrix system. Published 21 March 2008 in Br Dent J, 204(6): E10; discussion 310-1.
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