Deta Putri Futuhat, Arlette Suzie P, Meirina Gartika


Background:Class II division 1 dentoskeletal malocclusion with mandibular

retrognatic can be treated with twin block appliance. The objectives of this study
are to analyse twin block appliance based on mandibular dimension and anterior
facial height changes, and to determined the most effective time base on CVMS
to begin the treatment.
Method: The type of research was a retrospective analysis study using
secondary data. The sample was 14 lateral cephalometric radiographs before
and after treatment with twin block appliance. It was taken in IKGA RSGM FKG
UNPAD 2010 to 2016. Statistic analysis used paired t-test.
Results: Study shows that there is a significant change (p<0.05) in mandibular
dimension and anterior facial height after treatment with twin block appliance.
Changes in mandibular dimension including total mandibular length, mandibular
body length, ramus height, and gonial angle. Changes in anterior facial height
including lower anterior facial height and total anterior facial height. The CVMS
III group showed statistically significant result with the biggest improvement.
Conclusion: The use of twin block appliance in Class II division 1 dentoskeletal
malocclusion with mandibular retrognatic could change mandibular dimension
and anterior facial height. Apart from that, CVMS III was found to be the most
effective time to start the treatment with twin block appliance


Class II division 1 dentoskeletal malocclusion with mandibular retrognatic, twin block, mandibular dimension, anterior facial height, cervical vertebral maturation stage (CVMS)

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