Year : 2017

Volume : Volume 7

Issue : Issue 2

Address for correspondence :
Dr. R Thirunavukkarasu
tringortho@hotmail.com

Abstract

Aim:  To  assess  the  effects  of   three  different  treatment  approaches  on  incisor  inclination  changes  in  the  management  of   Class II   malocclusion. Materials and Methods: Three  patients  with  skeletal  Class II  division I  malocclusion  were  treated  with  three  different  treatment  approaches. Patient 1  was  treated  with  fixed  functional  appliances (Herbst) without  fixed  appliance, Patient 2 was treated  with  prefunctional fixed appliance with extraction and fixed functional appliances (Powerscope) and Patient 3 was treated with presurgical fixed appliance with extraction and surgical mandibular advancement procedure. The amount of lower incisor proclination in  each  case  was  assessed  using  the comprehensive  cephalometric analysis obtained and  from its comparisons  from  the  start  of   the  treatment  (T1)  and  the  end  of  the treatment (T2). Results: The  incisor  inclination  was  found  to  be  more  increased  in case of  treatment  with  Herbst  fixed  functional  appliance  alone  followed  by  bilateral  sagittal  split osteotomy  procedure  and  Powerscope  with  fixed  appliance. The  IMPA  values  of  T1   and  T2  for Herbst,  BSSO  and  Power scope  with  fixed  appliance  are  (T1 - 95◦  T2  - 116◦) (T1 - 96◦   T2  - 102◦)  (T1  -  110◦   T2 -  102◦)  respectively, which  shows  an  exaggerated  incisor  proclination  when  compared  to  the  other  two  procedures. Conclusion: The  extraction  protocol  and  fixed  appliance  plays  a  vital  role  in  positioning the  lower  incisors  during  the  correction  of  Class II  skeletal  mandibular  retrognathism  using  fixed  functional  appliances (FFA).

Keywords: Mandibular retrognathism, mandibular incisor inclination, fixed functional appliances.