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      Mixed dentition analysis – Applicability of two non-radiographic methods for Chennai school children

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          Abstract

          Aim:

          To evaluate the applicability of the Tanaka and Johnston (1974) and Moyers (1988) methods in predicting the size of permanent canines and premolars in Chennai school children.

          Materials and Methods:

          470 sets (127 female and 343 male) of cast models were included in the sample. Mesio-distal (m-d) widths of all teeth from left to right first molars were measured and compared with the predicted values derived from Tanaka and Johnston and Moyers methods.

          Results:

          There was significant bilateral symmetry and sexual dimorphism in teeth sizes seen in both the sexes. Sum of the m-d diameter of permanent mandibular incisors can be used reliably to predict the sum of m-d diameters of unerupted canines and premolars.

          Conclusions:

          Tanaka and Johnston's method cannot accurately predict the m-d widths. Moyers’ prediction tables can be used to estimate the m-d widths of unerupted canines and premolars closer to 50% probability level.

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          Most cited references 32

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          Mesiodistal crown diameters of the deciduous and permanent teeth in individuals.

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            Evaluation of the validity of tooth size and arch width measurements using conventional and three-dimensional virtual orthodontic models.

            Measurements and different analyses of dental casts are essential for precise diagnosis of an orthodontic case. At present, virtual computerized models, such as OrthoCAD, are available for clinicians, supplemented by dedicated software for performing needed measurements on them. The purpose of this study was to test the accuracy of measuring casts with the aid of calipers or OrthoCAD and compare these two techniques. Twenty setups using artificial teeth corresponding to various malocclusions were created. Impressions were taken of them, providing 20 plaster and 20 virtual orthodontic models. Measurements of mesiodistal tooth dimension as well as intercanine and intermolar width were made on both. Additionally, values of tooth size were calculated from the isolated artificial teeth removed from the setups and of arch width from the existing setups. The resulting values were compared by the use of nonparametric statistics, and methods' errors were also calculated. Results showed the methods being highly valid and reproducible for both tooth size and arch width. For the tested clinically applicable methods, measurement with digital calipers on plaster models showed the highest accuracy and reproducibility, closely followed by OrthoCAD. Digital calipers seem to be a more suitable instrument for scientific work. However, OrthoCAD's accuracy is clinically acceptable, and most likely, considering its present advantages and future possibilities, the examined or an equivalent 3D virtual models' procedure would become the standard for orthodontic clinical use.
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              SPSS survival manual: A step by step guide for data analysis using SPSS

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                Author and article information

                Journal
                J Int Soc Prev Community Dent
                J Int Soc Prev Community Dent
                JISPCD
                Journal of International Society of Preventive & Community Dentistry
                Medknow Publications & Media Pvt Ltd (India )
                2231-0762
                2250-1002
                May-Aug 2014
                : 4
                : 2
                : 133-138
                Affiliations
                Department of Pedodontics and Preventive Dentistry, Chadalawada Krishna Srinivasa Teja Institute of Dental Sciences, Tirupati, Andhra Pradesh, India
                [1 ]Department of Periodontics, Chadalawada Krishna Srinivasa Teja Institute of Dental Sciences, Tirupati, Andhra Pradesh, India
                [2 ]Department of Conservative Dentistry and Endodontic, Chadalawada Krishna Srinivasa Teja Institute of Dental Sciences, Tirupati, Andhra Pradesh, India
                Author notes
                Corresponding author: (email: < naveenkommineni@ 123456gmail.com >) Dr. Naveen Kumar Kommineni, Department of Pedodontics and Preventive Dentistry, Chadalawada Krishna Srinivasa Teja Institute of Dental Sciences, Tirupati - 517 507, Andhra Pradesh, India.
                Article
                JISPCD-4-133
                10.4103/2231-0762.139847
                4170547
                Copyright: © Journal of International Society of Preventive and Community Dentistry

                This is an open-access article distributed under the terms of the Creative Commons Attribution-Noncommercial-Share Alike 3.0 Unported, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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