Structural changes in the trabecular bone of the mandibular condyle of growing patients with sagittal jaw discrepancy treated with the twin‐block appliance

Abstract

Objective The objective of this study was to evaluate the structural changes in the trabecular bone of the mandibular condyles in patients treated with the Twin‐block functional orthopaedic appliance that act by promoting condylar growth and to compare the fractal dimension (FD) of condylar trabecular bone structure prior to treatment (T0) and after orthopaedic functional treatment (T1). Setting and sample population: This retrospective study included panoramic images of 112 individuals with a mean age of 11.04 ± 1.30 years in the study group (32 girls and 24 boys) and 11.6 ± .80 years in the control group (29 girls and 27 boys). Materials and Methods The standardized region of interest was selected as the right and left condylar areas close to the articulation surfaces from the twin‐block (TB) group, which included patients who completed functional orthopaedic treatment and the control group, which included untreated individuals. FD values in the condylar region were analysed from the panoramic radiographs of both groups using a box‐counting method with ImageJ software (version 1.52a, US National Institutes of Health). Results There was a significant decrease in the FD values of the right (−.038) and left (−.022) condylar region at T0 and T1 in the TB group. Between‐group FD comparisons demonstrated that the TB group showed changes in the condylar region (right, P = .004; left, P = .022) compared to the control group. Conclusion Functional orthopaedic forces caused a decrease in the trabecular structure of the condylar area examined.

Effects of reverse headgear therapy on mandibular trabecular structure: A fractal analysis study

“…When we compared the before and after treatment FD data in the present study, significant changes were observed in the corpus in the C‐G. Akan and Unlu Kurşun 11 performed a study in which they evaluated the trabecular structure of the mandibular condyles after twin‐block treatment, and have shown no difference in the comparison of the before and after treatment FD values in the control group. Since they investigated individuals with skeletal Class II malocclusion, it is normal that there is no significant change in condylar activity with age.…”

“…The limitation of this study was that the radiographic records used were two-dimensional. Although panoramic radiographs have proven to be reliable in FD measurements in previous studies, 10,11 further studies with three-dimensional images are needed.…”

“…As it is a routinely obtained patient record in orthodontics, a panoramic radiograph is a suitable assessment tool for the investigation of the changes in the mandibular trabeculation. It is a reliable measurement method that gives valid findings and has previously been used to evaluate the trabecular structure of the mandible in many different dental studies 10–12 …”

“…It is a reliable measurement method that gives valid findings and has previously been used to evaluate the trabecular structure of the mandible in many different dental studies. [10][11][12] Although various studies have investigated the cephalometric and occlusal effects of RME + RHG treatment on the dentoskeletal complex, there are no studies to evaluate its effects on the mandibular trabecular structure to our knowledge. Therefore, we aimed to assess the effects of RME + RHG treatment on mandibular bony architecture and compare these effects with an untreated control group in Class III patients using FD analysis.…”

Myobrace versus twin block in the treatment of class II malocclusion in Children: A systematic review

“…, 2021 , Entrenas et al, 2019 , Wishney et al, 2019 ) Antonorakis et al, claimed that by reducing overjet,the utilization of myofunctional appliances in kids having malocclusion of class II can help improve their smiles. ( Barber, 2015 , Wirawan and Herdiyati, 2018 , Akan and Kursun, 2021 ).…”