Asad ur Rehman, Amra Minhas Abid, Ayesha Shafiq, Saad Saud Farooqui, Umair Usman
2 Division 1 is the most prevalent type of malocclusion affecting about 32% of
Pakistani population. With upper
maxillary premolar extraction is one of most frequent treatment choice.
Aim: To evaluate
the effects of these extractions on soft tissue show variable results depending
upon the sex, ethnicity, maxillary arch crowding and pretreatment structure of
this study pretreatment cephalograms of 106 Class 2 div 1 patients were taken
whose treatment plan include extraction of maxillary 1st premolar. Then the
second and final cephalograms were taken when retraction of incisors was
completed. Mean changes in the position of upper and lower lip were measured
with respect to Ricketts E-line before and after completion of retraction of
the extraction of premolars there is a significant (P value=0.000) reduction in
the lip protrusion of -2.033mm±1.148mm and -1.695mm±1.628mm in both upper and
lower lip respectively.
Extraction of maxillary premolars cause significant reduction of lip prominence
and achieve facial esthetic balance.
2 div 1, lip position, Premolar Extraction