IADR Abstract Archives
Comparison of The Effect of Two Skeletally Anchored Force Mechanics for Correction of Skeletal Class II Malocclusion in Growing Patients (A Randomized Controlled Clinical Trial)
Objectives: The purpose of this study is to evaluate the dental and skeletal growth changes in two groups of growing skeletal Class II patients treated by either pushing or pulling mechanics applied to bone anchored miniplates and compare the treatment effects to a matched control patients.
Methods: Thirty-nine growing patients (17 females, 22 males; mean age 11.59 ± 0.56 years) with skeletal Class II malocclusion due to mandibular retrognathism were equally and randomly allocated into one of three groups. Group A, patients were treated by pushing force mechanics using Sabbagh Advanced Repositioning Appliance (SARA). Group B, patients were treated by pulling force mechanics using CS 2000 Class II correction spring (CS). In both groups (A and B), forces were applied to bimaxillary miniplates along the treatment time and stopped if the patient reached an edge-to-edge incisor relationship or after 9 months, whichever happened first. Group C (control) was observed with no interventions for 9 months to detect the natural growth changes. Pretreatment (T0) and posttreatment (T1) cone beam computed tomography scans (CBCT) were used for skeletal and dental measurements. Treatment changes were evaluated within each group, compared between the two groups (A and B) and in relation to the natural growth changes observed in group C.
Results: Relative to the control group, the effective mandibular length significantly increased by a mean difference of (5.38 ± 2.5 mm) and (7.31 ± 2.5 mm) in group A and B, respectively. A significant improvement in the skeletal sagittal relation was observed in both groups as the ANB angle decreased by (2.69 degree) in group A and by (1.92 degree) in group B. No significant changes were observed in the axial inclination of the mandibular incisors in both groups.
Conclusions: The use of either pushing or pulling skeletally anchored force mechanics was effective in enhancing the effective mandibular length in growing Class II malocclusion patients with negligible dentoalveolar side effects.
Methods: Thirty-nine growing patients (17 females, 22 males; mean age 11.59 ± 0.56 years) with skeletal Class II malocclusion due to mandibular retrognathism were equally and randomly allocated into one of three groups. Group A, patients were treated by pushing force mechanics using Sabbagh Advanced Repositioning Appliance (SARA). Group B, patients were treated by pulling force mechanics using CS 2000 Class II correction spring (CS). In both groups (A and B), forces were applied to bimaxillary miniplates along the treatment time and stopped if the patient reached an edge-to-edge incisor relationship or after 9 months, whichever happened first. Group C (control) was observed with no interventions for 9 months to detect the natural growth changes. Pretreatment (T0) and posttreatment (T1) cone beam computed tomography scans (CBCT) were used for skeletal and dental measurements. Treatment changes were evaluated within each group, compared between the two groups (A and B) and in relation to the natural growth changes observed in group C.
Results: Relative to the control group, the effective mandibular length significantly increased by a mean difference of (5.38 ± 2.5 mm) and (7.31 ± 2.5 mm) in group A and B, respectively. A significant improvement in the skeletal sagittal relation was observed in both groups as the ANB angle decreased by (2.69 degree) in group A and by (1.92 degree) in group B. No significant changes were observed in the axial inclination of the mandibular incisors in both groups.
Conclusions: The use of either pushing or pulling skeletally anchored force mechanics was effective in enhancing the effective mandibular length in growing Class II malocclusion patients with negligible dentoalveolar side effects.