@article{article_1452172, title={Effects of Two Appliances Used in the Correction of Class II Malocclusion on Mandibular Symphysis Morphology: Biblock and Activator}, journal={Current Research in Dental Sciences}, volume={35}, pages={300–306}, year={2025}, DOI={10.17567/currresdentsci.1452172}, author={Çakmak, Berrak and Rübendiz, Meliha}, keywords={Sınıf II maloklüzyon, Fonksiyonel aparey, Biblock, Aktivatör, Mandibular simfiz morfolojisi}, abstract={Objective: This study aimed to evaluate and compare the effects of two functional appliances, the Activator (AA) and the Biblock (BA), on mandibular symphysis (MS) morphology in patients with Class II malocclusion.
Methods: Records of patients treated at the Department of Orthodontics, Ankara University, between 2011 and 2021 were retrospectively analyzed. Inclusion criteria were mandibular deficiency, optimal growth pattern, and CS2–CS3 cervical maturation stage. Twenty patients treated with the Biblock (10 females, 10 males; mean age: 13.52±1.36 years) were identified. An age- and sex-matched control group of 20 patients treated with the Activator (mean age: 13.78±1.18 years) was selected. Lateral cephalometric radiographs taken before and after treatment were evaluated for angular and linear changes. Intragroup comparisons were performed with paired t-tests, and intergroup comparisons with independent t-tests.
Results: The mean treatment duration was 17.39±5.94 months in the BA group and 17.03±4.37 months in the AA group. Both appliances significantly improved Class II malocclusion. Significant anterior MS changes were observed in both groups, except for B-Ida-Idp. Upper MS width remained unchanged, while significant increases occurred in the middle (AA: 0.4±0.5 mm; BA: 0.4±0.5 mm) and lower widths (AA: 0.9±0.2 mm; BA: 0.8 ± 0.7 mm) (P<.005). Intergroup comparisons showed greater reduction in Pg-B-Ida and greater increase in Pg-B in the BA group (P<.05).
Conclusion: Functional treatment flattened MS curvature, promoted forward growth of B and Pg points, and altered anterior MS morphology. The effects of AA and BA on MS morphology were largely similar.
Keywords: Class II malocclusion, Functional appliance, Biblock, Activator, Mandibular symphysis morphology}, number={4}, publisher={Atatürk Üniversitesi}