Authors : Siddharth Dixit, K Sridhar, Upendra Jain, Amit Prakash, Sashibhushan Ekka, Chandrika Dubey
DOI : 10.18231/j.jco.2018.023
Volume : 2
Issue : 3
Year : 2018
Page No : 7-13
Introduction: In today’s scenario, it is very common for an orthodontist to see a Skeletal Class II Malocclusion due to retrognathic mandible in growing patients. Although various approaches for the treatment have been devised, twin block remains the most acceptable and popular among the functional appliances. Amongst the various approaches made towards the evaluation and assessment of the changes occurring in the temporomandibular joint caused by the functional appliance, MRI has been the choice of approach for the same owing to its diversified advantages.
Aim and objectives: To evaluate and compare hard and soft tissue changes in the Temporomandibular Joint caused by Clarks Twin Block appliance before and after the correction of class II molar relation by using MRI.
Result: The results of the study suggested that the forward position of condyle within the glenoid fossa and retrusion of articular disc in relation to condylar head was statistically significant after twin block therapy. At stage 1 (Pre-treatment), 8 of the 10 cases had anterior condylar position, and 2 patients had a posterior condylar position. Whereas, stage II (Post treatment) revealed 9 of the 10 patients showing anterior condylar position and 1 showed concentric condylar position.
Conclusion: The position of condyle in glenoid fossa and articular disc retrusion in relation to condylar head was statistically significant after twin block therapy. Forward relocation of the C-GF complex seems to be one of the mechanisms of action of functional appliances.
Key message: MRI study on functional appliance therapy supports and provides evidence for anterior remodelling of the condyle-glenoid fossa complex at the end of 6 months treatment with Twin block appliance.
Key words: Twin Block, MRI, Skeletal