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KJO Korean Journal of Orthodontics

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pISSN 2234-7518
eISSN 2005-372X
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Korean J Orthod

Published online March 30, 2021

Copyright © The Korean Association of Orthodontists.

Prevalence and Patterns of Tooth Agenesis among Patients Aged 12-22 years old: A Retrospective Study.

Basak Kiziltan Eliacika* , Cafer Atasa, Gunseli Guven Polata

a Department of Pediatric Dentistry, Hamidiye Faculty of Dental Medicine, University of Health Sciences, Istanbul, Turkey

Correspondence to:Asst. Prof. Basak Kiziltan Eliacik
Postal Address: University of Health Sciences, Hamidiye Faculty of Dental Medicine, Department of Pediatric Dentistry, Mekteb-i Tıbbiye-i Şahane (Haydarpaşa) Külliyesi Selimiye Mah. Tıbbiye Cad. No:38 34668 Üsküdar, İstanbul
E-mail: basak.eliacik@sbu.edu.tr
Telephone Number: +905300865217
Fax Number: +902164189620

This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/4.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Objective: The present study aimed to establish the prevalence and patterns of non-syndromic tooth agenesis in pediatric patients referred to a tertiary health care facility.
Methods: Intraoral records and panoramic radiographs of 9,874 patients aged 12-22 years were evaluated. The study group included 716 patients (345 female; 371 male) with non-syndromic agenesis of at least one tooth (except the third molars). The study data were assessed using descriptive statistics, Chi-square and Mann- Whitney U tests, while patterns were calculated using a tooth agenesis code tool (TAC).
Results: A total of 1627 (range: 1–8) congenitally missing teeth, excluding the third molars, were found in the cases of non-syndromic tooth agenesis with an average of 2.27 teeth per patient. The prevalence of tooth agenesis was 7.25%, and the most commonly missing teeth were the left mandibular second premolars (10.17%). The age group comparison revealed no significant difference in the median number of missing teeth per patient according to the cut-off values for ages between 12 and 22 years. When the missing teeth were examined according to quadrants separately, 114 different tooth agenesis patterns (q1=28, q2=27, q3= 31, q4= 28) were found in total., whereas 81 of them presented only once.
Conclusions: This study provides some enlightening information about the scientific knowledge of TAC procedure in a large sample group. With the application of the TAC procedure in this type of studies, template treatment plans can be developed by determining homogenous patterns of teeth agenesis in certain populations.

Keywords: Panoramic Radiography, Prevalence, Hypodontia, Dental aplasia, Retrospective study

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Korean J Orthod

Published online March 30, 2021

Copyright © The Korean Association of Orthodontists.

Prevalence and Patterns of Tooth Agenesis among Patients Aged 12-22 years old: A Retrospective Study.

Basak Kiziltan Eliacika* , Cafer Atasa, Gunseli Guven Polata

a Department of Pediatric Dentistry, Hamidiye Faculty of Dental Medicine, University of Health Sciences, Istanbul, Turkey

Correspondence to:Asst. Prof. Basak Kiziltan Eliacik
Postal Address: University of Health Sciences, Hamidiye Faculty of Dental Medicine, Department of Pediatric Dentistry, Mekteb-i Tıbbiye-i Şahane (Haydarpaşa) Külliyesi Selimiye Mah. Tıbbiye Cad. No:38 34668 Üsküdar, İstanbul
E-mail: basak.eliacik@sbu.edu.tr
Telephone Number: +905300865217
Fax Number: +902164189620

This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/4.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Objective: The present study aimed to establish the prevalence and patterns of non-syndromic tooth agenesis in pediatric patients referred to a tertiary health care facility.
Methods: Intraoral records and panoramic radiographs of 9,874 patients aged 12-22 years were evaluated. The study group included 716 patients (345 female; 371 male) with non-syndromic agenesis of at least one tooth (except the third molars). The study data were assessed using descriptive statistics, Chi-square and Mann- Whitney U tests, while patterns were calculated using a tooth agenesis code tool (TAC).
Results: A total of 1627 (range: 1–8) congenitally missing teeth, excluding the third molars, were found in the cases of non-syndromic tooth agenesis with an average of 2.27 teeth per patient. The prevalence of tooth agenesis was 7.25%, and the most commonly missing teeth were the left mandibular second premolars (10.17%). The age group comparison revealed no significant difference in the median number of missing teeth per patient according to the cut-off values for ages between 12 and 22 years. When the missing teeth were examined according to quadrants separately, 114 different tooth agenesis patterns (q1=28, q2=27, q3= 31, q4= 28) were found in total., whereas 81 of them presented only once.
Conclusions: This study provides some enlightening information about the scientific knowledge of TAC procedure in a large sample group. With the application of the TAC procedure in this type of studies, template treatment plans can be developed by determining homogenous patterns of teeth agenesis in certain populations.

Keywords: Panoramic Radiography, Prevalence, Hypodontia, Dental aplasia, Retrospective study