AUTHOR(S): Dr. Rajesh Kumar Kumawat, Dr. Deepak Goyal, Dr. Saurabh Chaturvedi, Dr. Vandana Kararia, Dr. Seema Chowdhary and Dr. Ramya G

ABSTRACT:Objective: to evaluate and compare the condylar positional changes after the treatment of class ii malocclusion patients using powerscope appliance and forsus fatigue resistant device using pre-treatment and post-treatment CBCT images.
Materials and Method: twenty subjects of adult age group having class ii division 1 malocclusion, horizontal to average growth pattern, orthognathic maxilla, retrognathic mandible, increased overjet were included in this study.
The subjects were divided into two groups, forsus group and power scope group. A pre-treatment cbct scan was taken before the start of the treatment using Kodak 9000 3d extraoral imaging system. In group i, forsus fatigue resistant appliance was used to achieve class i occlusion. After completion of the forsus therapy another CBCT scan was taken. In group ii, powerscope appliance was used to achieve class i occlusion. Sequential activation of the powerscope appliance was done using crimpable shims depending on the amount of skeletal discrepancy in each patient’s mouth, until edgeto-edge bite was obtained. After completion of the powerscope appliance therapy, another CBCT scan was taken.
After the pre and post treatment CBCT scans were analyzed, position of the condyle were assessed on the dicom images, using the cs 3d imaging software. The field of view was confined to the right and left TMJ. This was done so that condylar head, glenoid fossa and external auditory meatus were visualized and the data obtained were subjected to statistical analysis. Comparison of all the pre & post treatment parameters were done by paired-t test. Comparison of forsus and power scope group was done using independent t-test.
Results: an average forward shift of mandibular condyle by. 85 mm was seen after 7- 9 months of treatment in forsus appliances therapy and. 79 mm after powerscope therapy indicating that the forward mandibular condylar shift is greater in forsus group than the powerscope group, the forward condylar shift of two groups was statistically insignificant with a mean difference of. 060 mm.
Although both the forsus and powerscope groups showed a downward shift of mandibular condyle, there was a greater downward shift in forsus group (2.69 mm) compared to the powerscope group (2.29 mm), the downward condylar shift of two groups was statistically insignificant with a mean difference of 0.42mm.
Conclusion: forsus appliance brought about a more anterior and downward shift in the mandibular condylar position, compared to power scope group but the difference were not statistically significant between the two appliances i.e. Forsus and powerscope.

DOI: https://doi.org/10.22271/oral.2022.v8.i2f.1538

Pages: 409-417  |  651 Views  282 Downloads