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Introduction:
The
extraction of premolars is a common therapeutic approach in the
treatment of Class II, Division 1 malocclusion.
Aim:
This study aimed to test the null hypothesis that there is no
statistically significant difference in the change in angulation of
developing mandibular third molars between patients with Class II,
Division 1 malocclusion treated with the extraction of maxillary first
and mandibular second premolars and those treated with the extraction of
maxillary second premolars.
Materials and Methods:
The study included orthopantomographic radiographs taken before and
after orthodontic treatment in 28 patients aged 15–22 years with Class
II, Division 1 malocclusion. The patients were divided into Group I (n =
14), treated with the extraction of maxillary second premolars only, and
Group II (n = 14), treated with extraction of maxillary first and
mandibular second premolars. Statistical analysis was performed using
descriptive statistics and appropriate inferential tests (Student’s
t-test, Pearson’s χ˛ test, and Mann–Whitney test), with the level of
statistical significance set at p < 0.05.
Results: The mean
change in angulation of developing mandibular third molars in group II
were positive and significantly different from that observed in Group I
(p < 0.01). No statistically significant differences were found between
the left and right sides within either group. The percentage of lower
third molars showing an increase in angulation was 32.14% in Group I and
71.43% in Group II.
Conclusion:
The null hypothesis was rejected. Orthodontic treatment of Class II,
Division 1 malocclusion involving the extraction of maxillary first and
mandibular second premolars increase the likelihood of mandibular third
molar eruption by producing a significantly greater change in their
angulation.
Key words:
extraction treatment,
malocclusion, Class II, Division 1, lower third molar angulation
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Address of correspondence:
Prof. Predrag Janošević, DMD
University of Niš, Faculty of Medicine, Clinic
of Dental Medicine
52 Dr. Zorana Djindjića Blvd., 18000 Niš,
Serbia
E-mail:
predragjanosevic82@gmail.com
predrag.janosevic@medfak.ni.ac.rs
Copyright © 2026 by The Editorial Council of The Acta
Stomatologica Naissi
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