Article

Comparison of three mixed dentition analysis methods in orthodontic patients at AKUH.

Department of Surgery, Section of Dentistry, The Aga Khan University Hospital, Karachi.
Journal of the College of Physicians and Surgeons--Pakistan: JCPSP (Impact Factor: 0.3). 08/2010; 20(8):533-7.
Source: PubMed

ABSTRACT To compare the actual sum of canine and premolars and that predicted from three mixed dentition prediction methods in orthodontic patients at the Aga Khan University Hospital (AKUH), Karachi.
Cross-sectional comparative study.
Orthodontic clinic at the Aga Khan University Hospital from June 2002 to December 2007.
Data were collected using pretreatment records including orthodontic files and plaster casts of 121 orthodontic patients. Digital caliper was used to measure the mesiodistal widths of permanent teeth from 1st molar to 1st molar in mandibular arch, and central incisors and 1st molars in maxillary arch. The methods of Tanaka and Johnston, Moyers, and Bernabé and Flores-Mir were used to predict the mesiodistal widths of the canine and premolars. Comparison between the actual and predicted sum of the mesiodistal widths of canine and premolars was made for each prediction method, using paired sample t-test.
There were 45 males and 76 females with average ages of 13.3+/-1.3 and 13.4+/-0.8 years respectively. For males statistically significant differences were found for Moyers at the 75th percentile and Bernabé and Flores-Mir method whereas for females only the Bernabé and Flores-Mir's method showed significant results. However, no significant difference was found in both genders for Tanaka and Johnston method.
In the studied orthodontic patients for males Moyers 50th percentile and Tanaka and Johnston methods could be used; while for females Moyers 75th percentile and Tanaka and Johnston methods were applicable for mixed dentition analysis.

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    ABSTRACT: During mixed dentition period discrepancy between spaces available and required in the arch is predicted so that teeth can erupt freely with good alignment. Mixed dentition space analysis is done for this purpose in which size of unerupted canine and premolars is predicted. Accurate prediction is very important regarding correct orthodontic diagnosis and treatment planning. Prediction equation and or tables based on size of already erupted permanent teeth are the most widely used methods. Tooth size varies in different racial and ethnic groups and among genders so prediction equation and tables specific to each population for both male and female must be made. Mandibular incisors; combination of mandibular incisors and mandibular 1st molars; and mandibular incisors and maxillary 1st molars have been used worldwide. Recent studies have reported that mandibular incisors are not the best predictors and sum of mandibular incisors and maxillary 1st molars are even more accurate predictor for the estimation of size of unerupted teeth. In Pakistani population combination of mandibular incisors and maxillary 1st molar have not been employed so study must be conducted to estimate which combination of group of teeth is more accurate for the estimation of size of unerupted canine and premolars in local population.
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