A Journal of Army Medical & Dental Corps

Being published since 1956

ISSN (online) 2411-8842
ISSN (print) 0030-9648

VOL 68, No. 5, OCTOBER 2018

Effects Of Twin-Block Appliance Treatment on Skeletal and Dentoalveolar Changes In Class ll Division 1 Malocclusion Cases

Mariya Mujib, Amra Minhas Abid, Muhammad Alamgir


Objective: To assess reduction of profile convexity, correction of molar and canine relationship and achievement of normal over jet using Clark’s Twin Block appliance in growing subjects having skeletal class II patterns.
Study Design: Descriptive case series.
Place and Duration of Study: The study was conducted at KRL General Hospital Orthodontic department from Aug 2017 to Jan 2018.
Material and Methods: Fifty patients between 11-14 years of age were recruited having cervical maturation (CVM) stage 3 as diagnosed by their lateral cephalogram. Only Skeletal class II patients as confirmed by ANB values of >4 and SNB values of <78 having low angle (SN-MP) are included in this study. Good quality radiographs and study models are obtained at start of treatment T and at the end of achievement of results T1. Data was recorded in specially made proforma and analyzed using SPSS 20.0. Analysis included frequencies, Mean ± standard deviation (SD) and paired t test. A p-value <0.05 was considered significant.
Results: Results have established positive impact of Twin-Block appliance therapy in patients with CVM stage 3 Paired. T-test has revealed significant reduction in values of over jet and correction of class II molars and canines. Skeletal profile convexity has also been reduced by a significant reduction in angle of convexity.
Conclusion: This study has demonstrated that successful management of the first phase of treatment of a patient with Angle’s Class II Division I malocclusion using the twin block appliance can be achieved with significant outcomes.


Keywords : ANB, Curve of Spee, Maxillo-mandibular discrepancy.

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