Huma Siddique, Syed Shah Faisal, Beenish Ellahi Rizvi, Sufyan Ahmed.
Apical gingival margin movement in response to maxillary incisor intrusion with fixed orthodontic therapy.
Ann Abbasi Shaheed Hosp Karachi Med Dent Coll Jan ;18(1):10-2.

Objective: To determine the proportion of apical gingival margin movement in response to maxillary incisor intrusion, with fixed orthodontic therapy, in patients requiring maxillary incisor intrusion. Methods: Descriptive study was carried out in the Orthodontics department of Alvi Dental Hospital, Karachi, from June to December 2009. Forty five subjects requiring maxillary incisor intrusion were included in the study, who received 2x2 segmental 17x25 stainless steel archwire therapy, for 3 months. Maxillary incisor intrusion measured on cephalogram, and crown length, measured on cast and clinically, were used to compute the proportion of apical gingival margin movement in response to maxillary incisor intrusion. Results: Out of 45 patients, 20 subjects showed proportion of gingival margin movement in apical direction to be 71 to 80% in response to maxillary incisor intrusion, 18 subjects showed 61 to 70% and 12 patients demonstrated 81 to 90%. The mean reduction in clinical crown length was found to be 0.45 + 0.21 mm which was statistically significant (p<0.05). Conclusion: With maxillary incisor intrusion, the gingiva moves in the same direction as the tooth, yet considerably less. Hence incisor clinical crown reduces in length, resulting in unsatisfactory appearance of anterior teeth. This may indicate the need for gingival correction after intrusion therapy.

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