Abstract
Background: Using erupted components of a dental arch to estimate the width of the unerupted dental
components are the basis of mixed dentition analysis. Non-radiographic mixed dentition analysis employs a
regression equation to assess the width of the unerupted canines and premolars. In this study, we assessed
the applicability of two non-radiographic methods of mixed dentition analysis in orthodontic patients.
Methods: This cross-sectional research was carried out from the records of Ziauddin College of Dentistry,
Department of Orthodontics, from November 2019 to March 2020. Pre-treatment dental casts of 120 subjects
(60 males and 60 females) aged between 12-30 years undergoing orthodontic treatment were selected. The
mesiodistal widths from the left first molar to the right first molar were measured using a digital Vernier caliper
on pretreatment dental casts of both arches. Bachman’s and Tanaka-Johnston methods were applied to
estimate the widths of canine and premolars. Gender dimorphism for actual and estimated values was
assessed using an independent t-test and a paired t-test was applied for the comparison between the
actual and estimated mesiodistal widths of canine and premolar.
Results: The actual and estimated widths of canine and premolars reported 14.3±1.4 years for males and
13.4±1.2 years for females. In addition, the Bachman’s and Tanaka-Johnston method overestimated the
actual widths of unerupted canine and premolar but the difference was statistically insignificant (p≥ 0.05) in
both the genders.
Conclusion: The two non-radiographic methods were reliable for mixed dentition analysis with minor
overestimation between actual and estimated widths (ICC=0.79). This makes both the methods applicable
interchangeably in regular clinical practice.
Hafsa Mahida, Sarwat Memon, Maham Khan, Farheen Naz. (2021) Applicability of Two Non-Radiographic Mixed Dentition Analysis Methods in Orthodontic Patients, The Pakistan Journal of Medicine and Dentistry, Volume 10, Issue-1.
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