EVALUATION OF TREATMENT RESULTS AND STABILITY IN PATIENTS WITH ANTERIOR OPEN BITE TREATED BY PREMOLAR EXTRACTIONS OR MINI-IMPLANT ANCHORED INTRUSION

Aim:The aim of this study was to compare the treatment results and stability of open bite treatment achieved via intrusion of posterior teeth and extraction of 1 st premolars Material and Methods: This study was conducted on pretreatment (T1), posttreatment (T2) and follow-up (T3) cephalograms of 28 patients who received open bite treatment.14 patients (mean age 14.61±0.87)were treated with the extraction of the 1 st premolar (extraction group: EG) while 14 patients (mean age 15.06±1.05)had bite closure via intrusion of the posterior teeth using mini-implants (miniimplant group: MG).The mean follow-up periods in EG and MG were 3.32±1.25(range, 2.10-6.20)and 2.74±0.77years (range, 2.05-4.34),respectively.Results: At T2, SNB increased and SNGoGn decreased significantly in MG, with significant intergroup difference (p<0.05).Maxillary and mandibular incisors extruded significantly in both groups, with greater amounts in EG (p<0.05).Maxillary and mandibular incisors' inclinations decreased significantly in EG, with a significant intergroup difference (p<0.05).Maxillary posterior teeth intruded significantly in MG, with a significant intergroup difference (p<0.05).At T3, significant intrusion of upper incisors and extrusion of posterior teeth were observed in EG and MG, respectively, and these measurements showed significant intergroup differences (p<0.05).Decreases in overbite were significant in both groups, with no intergroup difference.The clinically significant relaps rates were 7.14% (1 patient) and 14.28% (2 patients) in MG and EG, respectively.Conclusion: Even though mini-implant supported intrusion and extraction therapy achieved bite closure via different treatment effects, both groups showed similar relaps tendencies at the follow-up.