Objective: The aim of this study was to determine palatal and maxillary arch width
changes during MBT PEA with maxillary first premolars extraction treatment in patients
with Class II division 1 malocclusion.
Material and Methods: Dental casts of
24 Class II division 1 patients (8 males and 16
females) were evaluated. The minimum age of the subjects at the beginning of treatment
was above 16 years with mean age 02.02± 2.82. All patients were treated with extraction of
the maxillary first premolars and MBT PEA. Pre- and post-treatment maxillary and palatal
(inter-canine and inter-molar) widths were measured using a digital calliper of 0.01
accuracy. Paired samples t-test was used to evaluate the treatment changes within total
sample and within males group and females group. Differences between males and females
were tested using independent samples t-test.
Results: At the end of treatment, maxillary and palatal inter-canine widths increased
significantly (P>0.001).The maxillary inter-molar width increased but the values were
statistically insignificant (P<0.05). The palatal inter-molar width increased significantly
(P>0.01). No significant differences were observed between males and females.
Conclusions: Class II division 1 patients treated with extraction of maxillary first
premolars had tendency for an increase in palatal and arch width during treatment except
maxillary inter-molar width. It seems that a more thorough assessment and investigation
including pretreatment arch shape and factors related to anchorage should be carried out.
The aim of the study is to determine the relationship between the
dental arch form and facial growth pattern in vertical diamond
among adult patients . The study consisted of 123 patients that
met the inclusion conditions.