TANAKA AND JOHNSTON'S MIXED DENTITION VALIDITY: AN ANALYSIS AMONG YEMENI ADULTS IN SANA'A CITY

  • Waleed Abdualaziz Mohammad Dahag Orthodontics, Pedodontics and Prevention Department Faculty of Dentistry, Sana'a University, Yemen.
  • Abdulwahab Ismail Mohamed Al-Kholani Department of conservative dentistry, Faculty of Dentistry, Sana’a University, Republic of Yemen.
  • Taghreed Ahmed M Al-Kibsi Department of Maxillo-Facial, Faculty of Dentistry, Sana’a University, Republic of Yemen.
  • Hussein Shoga Al-Deen Orthodontics, Pedodontics and Prevention Department Faculty of Dentistry, Sana'a University, Yemen.
  • Hassan Abdulwahab Al-Shamahy Department of Basic Sciences, Faculty of Dentistry, Sana’a University, Republic of Yemen. Faculty of Dentistry, Genius University for Sciences and Technology, Dhamar city, Republic of Yemen.
  • Khaled A AL-Haddad Orthodontics, Pedodontics and Prevention Department Faculty of Dentistry, Sana'a University, Yemen.
  • Ameen Abdullah Yahya Al-Akwa Orthodontics, Pedodontics and Prevention Department Faculty of Dentistry, Sana'a University, Yemen.
  • Mohammed A Al-labani Orthodontics, Pedodontics and Prevention Department Faculty of Dentistry, Sana'a University, Yemen.

Abstract

Introduction and objective: Mixed dentition space analysis methods via Tanaka-Johnston analysis are regularly used all over the world. Conversely, the appropriate of this analysis between different ethnic groups is dubious. The study aimed to test the appropriate of the Tanaka-Johnston analysis for Yemeni adults and to arise regression equations designed for Yemen population if needed. 


Methods: The study included two hundred and twenty-seven (106 males and 121 females) Yemenis from Sana'a University, University of Science and Technology, and Al-Rehab Private Clinic. The mesiodistal widths of the four permanent lower canines, incisors, and premolars for the entire quadrants were determined with a digital caliper to the nearest 0.01 mm. To compare average presentation values ​​derived from this study with values ​​derived using Tanaka-Johnston equations, Student's paired t-test was used, as well as the chi-square (χ2) test used for appropriateness of fit.


Result: Gender differences were observed in the total mesiodistal width of both canines and premolars in both arches as revealed by the t-test (p < 0.001). The sum of the actual mesiodistal width of the canines and premolars was compared with the expected widths derived from the Tanaka and Johnston equation and significant differences (p<0.001) were found. Regression analysis indicated that the sum of the mesiodistal width of the permanent mandibular incisors is a good predictor of that of un-erupted canines and premolars, with correlation coefficients ranging from 0.51 to 0.61. Accordingly, two linear regression equations were developed to predict tooth width for Yemeni males and females.


Conclusion: It was concluded from this study that the Tanaka-Johnston analysis did not accurately predict the mesiodistal width of the unruptured canines and premolars of the Yemeni population. Moreover, new regression equations have been developed for the research sample that can be a standard for Yemen. However, further studies must be performed to verify the applicability and accuracy of these equations.


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Peer Review History:


Received: 10 November 2021; Revised: 12 December; Accepted: 29 December, Available online: 15 January 2022


Academic Editor: Dr. Asia Selman Abdullahorcid22.jpg, Pharmacy institute, University of Basrah, Iraq, asia_abdullah65@yahoo.com


UJPR follows the most transparent and toughest ‘Advanced OPEN peer review’ system. The identity of the authors and, reviewers will be known to each other. This transparent process will help to eradicate any possible malicious/purposeful interference by any person (publishing staff, reviewer, editor, author, etc) during peer review. As a result of this unique system, all reviewers will get their due recognition and respect, once their names are published in the papers. We expect that, by publishing peer review reports with published papers, will be helpful to many authors for drafting their article according to the specifications. Auhors will remove any error of their article and they will improve their article(s) according to the previous reports displayed with published article(s). The main purpose of it is ‘to improve the quality of a candidate manuscript’. Our reviewers check the ‘strength and weakness of a manuscript honestly’. There will increase in the perfection, and transparency. 


Received file:blue_23983.gif                Reviewer's Comments:download_logo_r_29189.gif


Average Peer review marks at initial stage: 6.5/10


Average Peer review marks at publication stage: 7.5/10


Reviewers:


orcid22.jpgDr. A.A. Mgbahurike, University of Port Harcourt, Nigeria, amaka_mgbahurike@yahoo.com


orcid22.jpgRola Jadallah, Arab American University, Palestine, rola@aauj.edu


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Keywords: adults, mixed dentition, regression equations, Tanaka-Johnston analysis, Yemen

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Dahag, W. A. M., A. I. M. Al-Kholani, T. A. M. Al-Kibsi, H. S. Al-Deen, H. A. Al-Shamahy, K. A. AL-Haddad, A. A. Y. Al-Akwa, and M. A. Al-labani. “TANAKA AND JOHNSTON’S MIXED DENTITION VALIDITY: AN ANALYSIS AMONG YEMENI ADULTS IN SANA’A CITY”. Universal Journal of Pharmaceutical Research, Vol. 6, no. 6, Jan. 2022, doi:https://doi.org/10.22270/ujpr.v6i6.691.
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