Objective: to compare the condylar volume and mandibular length changes of skeletally versus dentally anchored Herbst appliance in the treatment of Class II division 1 patients due to mandibular deficiency.
Materials and Methods: The current study was conducted on 17 female patients with their age ranged between 14 and 20 years. All patients were treated by Type IV Herbst appliance. The active group (Group A) comprising 10 patients at whose the Herbst was anchored to the mandible directly by two reconstruction plates located bilaterally in the mandible between the canine and first premolar, while attached to the maxilla through dental splints utilizing orthodontic bands, while the control group (Group B) comprising 7 patients, their CBCT data were taken from a previous study at which the Herbst appliance was anchored with custom made vitalium splints for both the maxillary and mandibular dental arches.
The condylar volume and the 3D effective mandibular length was measured using Dolphin software (Dolphin imaging software ver.11.95, Patterson Dental, USA). Statistical analysis was performed with Assistant 7.6 statistics software for Windows (Campina Grande, Paraiba state, Brazil)
Results: Condylar volume showed no statically significant change with treatment in both groups, while the 3D effective mandibular length showed statistically significant increase with treatment in both groups.
Conclusions: Skeletally anchored Herbst has same mandibular skeletal effect when compared with dentally anchored Herbst.