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CC BY 4.0 · European Journal of General Dentistry 2024; 13(03): 198-204
DOI: 10.1055/s-0044-1782187
Original Article

Tanaka and Johnston Space Analysis: Does It Apply to All Populations?

Fudhla Sadoon Al-Zubaydi
1   Department of Orthodontics, University of Baghdad/Health Center, Baghdad, Iraq
,
Dina H. Obaid
2   Department of Orthodontics, College of Dentistry, University of Baghdad, Baghdad, Iraq
,
Mohammed Nahidh
2   Department of Orthodontics, College of Dentistry, University of Baghdad, Baghdad, Iraq
,
Maria Maddalena Marrapodi
3   Department of Woman, Child and General and Specialist Surgery, University of Campania “Luigi Vanvitelli”, Naples, Italy
,
Vincenzo Ronsivalle
4   Department of Biomedical and Surgical and Biomedical Sciences, Catania University, Catania, Italy
,
Marco Cicciù 
4   Department of Biomedical and Surgical and Biomedical Sciences, Catania University, Catania, Italy
,
Giuseppe Minervini
5   Saveetha Dental College and Hospitals, Saveetha Institute of Medical and Technical Sciences (SIMATS), Saveetha University, Chennai, Tamil Nadu, India
6   Multidisciplinary Department of Medical-Surgical and Dental Specialties, University of Campania “Luigi Vanvitelli”, Naples, Italy
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Abstract

Objectives An accurate analysis is considered a crucial factor that enables the clinician to select the appropriate treatment plan which may include serial extractions, guiding of eruption, maintenance of space or regaining it, or just intervallic patient observation during this period. This study aims to test the applicability of the Tanaka and Johnston prediction equations on Iraqi population.

Materials and Methods One hundred pairs of stone models belonged to 100 Iraqi adult individuals with normal occlusal relationship were utilized in this study. The greatest crown diameters of all teeth except the maxillary incisors and molars in both jaws were measured using digital calipers. The Tanaka and Johnston prediction equations were applied and modification for these equations was developed for Iraqis.

Results The original Tanaka and Johnston method of prediction tends to overestimate the mesiodistal widths of the canine and premolars among Iraqis. Novel regression equations (modified Tanaka and Johnston method) were formulated for Iraqi population and seem to be more accurate than the original one.

Conclusions The original Tanaka and Johnston method cannot be applied for Iraqi population; hence, new equations were developed for both genders and in both dental arches to accurately predict the mesiodistal widths of the unerupted canine and premolars.

Keywords

orthodontic - Tanaka and Johnston space analysis - study models


Publikationsverlauf

Artikel online veröffentlicht:
14. Mai 2024

© 2024. The Author(s). This is an open access article published by Thieme under the terms of the Creative Commons Attribution License, permitting unrestricted use, distribution, and reproduction so long as the original work is properly cited. (https://creativecommons.org/licenses/by/4.0/)

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