In vivo Evaluation of Proximal Resin Composite Restorations performed using Three Different Matrix Systems.
OBJECTIVE
The aim of this in vivo study was to radiographically evaluate the proximal contour of composite resin restorations performed using different matrix systems.


MATERIALS AND METHODS
Patients with premolars needing class II type resin composite restorations involving the marginal ridge were selected. Thirty premolars were selected and randomly divided into three groups (n = 10 each) to receive restorations using different matrix systems: group 1: metal matrix coupled to a carrier matrix and wood wedge (G1-MMW); group 2: sectioned and precontoured metal matrix and elastic wedge (G2-SME); and group 3: a polyester strip and reflective wedge (G3-PMR). After the restorative procedure, bitewing radiographs were performed and analyzed by three calibrated professionals. The quality of the proximal contact and marginal adaptation of the proximal surfaces was classified as either correct or incorrect (undercontour/overcontour).


RESULTS
The Pearson Chi-square statistical test (α = 5%) revealed a statistically difference between frequencies of correct and incorrect restorations (α(2) = 6.787, p < 0.05). The group G2 SME produced a higher frequency of correct proximal contours (90%), while G1-MMW and G3-PMR had a ratio of 40% correct and 60% incorrect contours respectively.


CONCLUSION
None of the matrix systems was able to prevent the formation of incorrect proximal contours; however, the sectioned and precontoured metal matrix/elastic wedge configuration provided better results as compared to the other groups.
['Gomes|Isabella Azevedo|IA|', 'Filho|Etevaldo Matos Maia|EM|', 'Mariz|Debora Castelo Branco Rios|DC|', 'Borges|Alvaro Henrique|AH|', 'Tonetto|Mateus Rodrigues|MR|', 'Firoozmand|Leily Macedo|LM|', 'Kuga|Carlos Milton|CM|', 'De Jesus|Rudys Rodolfo Tavarez|RR|', 'Bandéca|Matheus Coelho|MC|']
D000328:Adult D001641:Bicuspid D003188:Composite Resins D003722:Dental Alloys D001840:Dental Bonding D003737:Dental Cavity Preparation D018772:Dental Marginal Adaptation D003764:Dental Materials D003793:Dental Restoration, Permanent D005260:Female D006801:Humans D008297:Male D008434:Matrix Bands D013499:Surface Properties
Composite resins Esthetics Radiography