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postulate that repeated instrumentation in shallow sulci, beyond the cementoenamel junction, mechanically wounds the principal fibers of the periodontal ligament and leads to their detachment from the root surface.
Then, marks (notches) were made on the defect in the most apical region in the cementoenamel junction with a half (# 1/2) round bur at low speed.
cingulum, followed by lateral fossa, cementoenamel junction and root in decreasing order, most commonly located in the midpalatal area followed by distal and then mesial.
INTRODUCTION: Talon cups are morphologically well-delineated, accessory talon-shaped cusps, projecting from the lingual or facial surface of the crown of incisors and extending at least half the distance from the cementoenamel junction to the incisal edge (1).