Caries Paired Differences Mean Standard Deviation Standard Error Mean 95% Confidence Interval of the Difference t p-Value (p<0.01) Lower Upper abutments – non-abutments 0.902 1.375 0.176 0.55 1.254 5.122 0.0

Table 7: t-test of the caries between abutments and non-abutments teeth at one year recall.