This could be attributed to the fact that these teeth might have been lost due to nonperiodontal reasons such as avulsion due to tooth trauma and extractions to meet the requirements of orthodontic and prosthodontic reasons.[ 7 ] Highly significant differences were observed in the mean LOA between grooved and nongrooved surfaces as shown in Table 2 .
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Morphological study of proximal root grooves and their influence on periodontal attachment loss.
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