[A clinical study of the effect of modified corticotomy on periodontium].

OBJECTIVE: To evaluate the effect of modified corticotomy on periodontal parameters in the treatment of Class III surgical patients facilitated by accelerated osteogenic orthodontics. METHODS: Nine Class III surgical patients at the age of 18-30 (7 females and 2 males) who were systematically and periodontally healthy were involved in the study, including 72 teeth and 216 sites. The modified corticotomy (piezotome) and bone graft (tricalcium phosphate, TCP) in maxillary anterior area were conducted after aligning and leveling the dental arch to facilitate the closing of space in upper dentition. Measurements such as plaque index (PLI), probing depth (PD), bleeding index (BI), recession (REC), keratinized gingiva width (KEG), biotype (BIO) were recorded pre-operation, 1, 2, 4 and 8 weeks post-operation. RESULTS: The differences of PD, BI and REC before and after operation were not statistically significant (P > 0.05). The median value of PLI before and after operation was 0. The percentage of thin biotype and thick biotype teeth was 74% (53/72) and 26% (19/72) pre-operation respectively. The difference of KEG between pre-operation [(5.1 +/- 1.4) mm] and 8 weeks post-operation [(5.1 +/- 1.2) mm] was not statistically significant (P = 0.658), but the mean value of KEG in other post-operation groups [1 week: (5.7 +/- 1.3) mm, 2 weeks: (5.8 +/- 1.3) mm, 4 weeks: (5.6 +/- 1.4) mm] was significantly higher than those of pre-operation (F = 12.087, P = 0.000). CONCLUSIONS: Modified corticotomy in the treatment of Class III surgical patients facilitated by accelerated osteogenic orthodontics is safe to periodontium.