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.
Highlights
The mixed dentition period initiates, at approximately 6 years of age, once the first permanent molars or incisors erupt
Mixed dentition is a transitory stage demarcated from the time the first permanent tooth erupts and lasts until the last primary tooth is shed[1]
Arch length and discrepancy of tooth size are two factors involved in eliciting problems in the mixed dentition phase[1,2,3]
Summary
The mixed dentition period initiates, at approximately 6 years of age, once the first permanent molars or incisors erupt. Mixed dentition is a transitory stage demarcated from the time the first permanent tooth erupts and lasts until the last primary tooth is shed[1]. Dental malocclusion can commonly occur during this phase To address effectively, this problem, various prediction methods consisting of systems and formulas based on fixed algorithms have been devised. This problem, various prediction methods consisting of systems and formulas based on fixed algorithms have been devised These are termed as mixed dentition analysis. 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. We assessed the applicability of two non-radiographic methods of mixed dentition analysis in orthodontic patients
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