Comparison of Intrusive Effects and Amount of Root Resorption in Maxillary Incisors Using Two Conventional Intrusion Arches and Mini-Implants.

This study aimed to compare the amount of maxillary incisor intrusion and root resorption using three

Methods: mini-implants, utility arches, and Connecticut intrusion arches. Eighteen patients aged 15 to 25 years with deep bite were divided into three groups: 10 patients each for mini-implant, utility arch, and Connecticut intrusion arch groups. Bilateral mini-implants were used in Group 1, while utility and Connecticut arches were used in Groups 2 and 3, respectively. Intrusion was performed over four months. Lateral cephalograms and orthopantomograms were taken at the start (T1) and after four months (T2). The mean incisor intrusion measured by U1-PP was 2.08 mm in Group 1, 1.55 mm in Group 2, and 1.75 mm in Group 3 (P < 0.05). CR-PP measurements showed 1.91 mm in Group 1, 1.56 mm in Group 2, and 1.66 mm in Group 3 (P < 0.05). Incisors in Group 1 showed minimal protrusion compared to significant protrusion in Groups 2 and 3 (P < 0.05). Maxillary molars showed no significant changes in Group 1 but distal tipping in Groups 2 and 3 (P < 0.05). No root resorption was observed in any group. Mini-screws demonstrated the most effective maxillary incisor intrusion with minimal side effects compared to utility and Connecticut intrusion arches.