Cluster analysis of tooth size in subjects with normal occlusion
Introduction: Tooth-size studies are important in orthodontics. Our aim in this study was to establish normative data on tooth size with a clustering method. Methods: Dental casts of 307 subjects with normal occlusion were examined. In these subjects, the tooth-size data sets in the maxilla and the...
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| Published in | American journal of orthodontics and dentofacial orthopedics Vol. 132; no. 6; pp. 796 - 800 |
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| Main Authors | , , , , |
| Format | Journal Article |
| Language | English |
| Published |
United States
Mosby, Inc
01.12.2007
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| Subjects | |
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| Abstract | Introduction: Tooth-size studies are important in orthodontics. Our aim in this study was to establish normative data on tooth size with a clustering method.
Methods: Dental casts of 307 subjects with normal occlusion were examined. In these subjects, the tooth-size data sets in the maxilla and the mandible were clustered for men and women by using multivariate normal mixture models. This analysis clustered the data sets into groups of observations that were cohesive and separate from the other groups. The parameters were estimated with expectation-maximization procedures, and the number of clusters was selected via the Bayesian information criterion.
Results: Seven heterogeneous clusters in men and 4 clusters in women were identified. This study indicated that, in normal occlusion, tooth sizes are variable. These heterogeneities in the normal occlusion group seem to have contributed to the variability found in normative data.
Conclusions: The method used in this study seems to provide a more substantive design for artificial teeth and add an additional dimension in the process of diagnosis of patients. Further applications seem possible in dental anthropometry by simultaneously dealing with the full dentition as a data set. |
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| AbstractList | Introduction: Tooth-size studies are important in orthodontics. Our aim in this study was to establish normative data on tooth size with a clustering method.
Methods: Dental casts of 307 subjects with normal occlusion were examined. In these subjects, the tooth-size data sets in the maxilla and the mandible were clustered for men and women by using multivariate normal mixture models. This analysis clustered the data sets into groups of observations that were cohesive and separate from the other groups. The parameters were estimated with expectation-maximization procedures, and the number of clusters was selected via the Bayesian information criterion.
Results: Seven heterogeneous clusters in men and 4 clusters in women were identified. This study indicated that, in normal occlusion, tooth sizes are variable. These heterogeneities in the normal occlusion group seem to have contributed to the variability found in normative data.
Conclusions: The method used in this study seems to provide a more substantive design for artificial teeth and add an additional dimension in the process of diagnosis of patients. Further applications seem possible in dental anthropometry by simultaneously dealing with the full dentition as a data set. Tooth-size studies are important in orthodontics. Our aim in this study was to establish normative data on tooth size with a clustering method.INTRODUCTIONTooth-size studies are important in orthodontics. Our aim in this study was to establish normative data on tooth size with a clustering method.Dental casts of 307 subjects with normal occlusion were examined. In these subjects, the tooth-size data sets in the maxilla and the mandible were clustered for men and women by using multivariate normal mixture models. This analysis clustered the data sets into groups of observations that were cohesive and separate from the other groups. The parameters were estimated with expectation-maximization procedures, and the number of clusters was selected via the Bayesian information criterion.METHODSDental casts of 307 subjects with normal occlusion were examined. In these subjects, the tooth-size data sets in the maxilla and the mandible were clustered for men and women by using multivariate normal mixture models. This analysis clustered the data sets into groups of observations that were cohesive and separate from the other groups. The parameters were estimated with expectation-maximization procedures, and the number of clusters was selected via the Bayesian information criterion.Seven heterogeneous clusters in men and 4 clusters in women were identified. This study indicated that, in normal occlusion, tooth sizes are variable. These heterogeneities in the normal occlusion group seem to have contributed to the variability found in normative data.RESULTSSeven heterogeneous clusters in men and 4 clusters in women were identified. This study indicated that, in normal occlusion, tooth sizes are variable. These heterogeneities in the normal occlusion group seem to have contributed to the variability found in normative data.The method used in this study seems to provide a more substantive design for artificial teeth and add an additional dimension in the process of diagnosis of patients. Further applications seem possible in dental anthropometry by simultaneously dealing with the full dentition as a data set.CONCLUSIONSThe method used in this study seems to provide a more substantive design for artificial teeth and add an additional dimension in the process of diagnosis of patients. Further applications seem possible in dental anthropometry by simultaneously dealing with the full dentition as a data set. Introduction: Tooth-size studies are important in orthodontics. Our aim in this study was to establish normative data on tooth size with a clustering method. Methods: Dental casts of 307 subjects with normal occlusion were examined. In these subjects, the tooth-size data sets in the maxilla and the mandible were clustered for men and women by using multivariate normal mixture models. This analysis clustered the data sets into groups of observations that were cohesive and separate from the other groups. The parameters were estimated with expectation-maximization procedures, and the number of clusters was selected via the Bayesian information criterion. Results: Seven heterogeneous clusters in men and 4 clusters in women were identified. This study indicated that, in normal occlusion, tooth sizes are variable. These heterogeneities in the normal occlusion group seem to have contributed to the variability found in normative data. Conclusions: The method used in this study seems to provide a more substantive design for artificial teeth and add an additional dimension in the process of diagnosis of patients. Further applications seem possible in dental anthropometry by simultaneously dealing with the full dentition as a data set. Tooth-size studies are important in orthodontics. Our aim in this study was to establish normative data on tooth size with a clustering method. Dental casts of 307 subjects with normal occlusion were examined. In these subjects, the tooth-size data sets in the maxilla and the mandible were clustered for men and women by using multivariate normal mixture models. This analysis clustered the data sets into groups of observations that were cohesive and separate from the other groups. The parameters were estimated with expectation-maximization procedures, and the number of clusters was selected via the Bayesian information criterion. Seven heterogeneous clusters in men and 4 clusters in women were identified. This study indicated that, in normal occlusion, tooth sizes are variable. These heterogeneities in the normal occlusion group seem to have contributed to the variability found in normative data. The method used in this study seems to provide a more substantive design for artificial teeth and add an additional dimension in the process of diagnosis of patients. Further applications seem possible in dental anthropometry by simultaneously dealing with the full dentition as a data set. |
| Author | Kim, Tae-Woo Ahn, Sug-Joon Lee, Shin-Jae Lee, Sungim Lim, Johan |
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| Cites_doi | 10.1016/0003-9969(95)00143-3 10.1177/00220345570360011501 10.1214/aos/1176344136 10.1016/0031-3203(95)00049-6 10.1016/0003-9969(68)90043-5 10.1111/j.2517-6161.1977.tb01600.x 10.1067/mod.2002.124995 10.1016/0002-9416(62)90129-X 10.1093/bioinformatics/17.10.977 10.1198/016214502760047131 10.1016/S0889-5406(03)00048-9 10.1177/00220345650440022201 10.1177/00220345650440020701 10.1177/00220345670460055801 10.1177/00220345650440030601 10.5005/jcdp-6-2-36 10.1016/0002-9416(83)90320-2 |
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| Snippet | Introduction: Tooth-size studies are important in orthodontics. Our aim in this study was to establish normative data on tooth size with a clustering method.... Tooth-size studies are important in orthodontics. Our aim in this study was to establish normative data on tooth size with a clustering method. Dental casts of... Tooth-size studies are important in orthodontics. Our aim in this study was to establish normative data on tooth size with a clustering... |
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| SubjectTerms | Adolescent Adult Bayes Theorem Cluster Analysis Dentistry Dentition, Permanent Female Humans Korea Male Odontometry Organ Size Reference Values Sex Characteristics Tooth - anatomy & histology |
| Title | Cluster analysis of tooth size in subjects with normal occlusion |
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