Short-term clinical success of posterior amalgam and composite restorations in public dental care: a multicenter retrospective study.

Although this difference did not reach statistical significance, the composition of failures differed markedly between institutions (χ2=24.87, df = 2, p < 0.001): secondary/residual caries was the predominant failure mode at DHC (25/32, 78.1%), whereas fracture predominated at DF (38/65, 58.5%).

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