A breach in these defense mechanisms by abrasions, poor oral hygiene, extraction socket, periodontal disease, pulpal exposure, or overhanging restoration
may lead to oral TB.
Primary caries Secondary caries Bulk fracture Marginal failure/ditching Dislodged restoration Cervical abrasion Others - attrition, overhanging restoration
, frac- tured cusp/s etc.
violating biologic width area can result in gingival inflammation, loss of periodontal tissue attachment, and unpredictable bone loss.
However when this result was compared with other studies which were conducted on prevalence of overhanging restorations
, around 34% were represented as overhanging restorations