الفهرس 
Title : Effect of Modified Twin Block in Skeletal Class II Growing Females with Mandibular Deficiency: A randomized controlled clinical trial
AbstractOnly 14 pages are availabe for public view
 |  | from | 217 |  |  |
| | | from | 217 | | |
Abstract
This study was performed to evaluate the treatment effects and compliance of modified twin block
appliance versus conventional twin block appliance in the treatment of growing females with skeletal
Class II malocclusion having mandibular deficiency, And to reveal the physical changes of polymers
used in this study after irradiation by gamma rays. The total sample consisted of 30 females divided
into 2 groups, group 1 was treated by modified twin block appliance (MTB) and group 2 was treated
by conventional twin block appliance (CTB). Results revealed that both treatment interventions showed
a positive effect on mandibular growth, lower incisors showed no further proclination during treatment
using MTB group and this group showed a better compliance for appliance wearing. Concerning the
gamma radiation effect on the polymers used, Poly methylmethacrylate showed yellowish color change
and increased number of pores on its surface after irradiation while polyethylene vacuum sheets didn’t
show any color change but the scratches and pores appeared on its surface using scanning electron
microscope.