ABSTRACT

Objectives

To identify changes in orthodontic management strategies in patients with hypodontia seen in 2000, 2010, and 2017/2018 (during a 1-year period).

Materials and Methods

An assessment of the panoramic radiographs of 3701 patients from a Western Australian private practice identified 276 individuals demonstrating hypodontia. The location of missing teeth, age, sex, type of malocclusion, and the management strategies (space closure or opening) for each patient were noted.

Results

Most hypodontia involved agenesis of three or fewer teeth (90%). Maxillary lateral incisors and mandibular second premolars were the most commonly missing teeth. Female preponderance was noted. When considering treatment, the odds ratio for orthodontic space opening and prosthetic replacement in 2000 was 3.266 (P value = 7e-04; 95% confidence interval [CI], 1.464–4.633) compared with patients seen in 2010 and 1.632 (P value = 7e-04; 95% CI, 0.811–2.434) compared with patients in 2017/2018. For patients demonstrating bilateral absence of maxillary lateral incisors, the odds ratio for orthodontic space opening was 3.185 (P value = 0.0215; 95% CI, 1.182–9.243) compared with counterparts with unilateral agenesis. None of the factors investigated were significantly associated with the types of treatment planned/provided for the patients with missing mandibular second premolars.

Conclusions

Maxillary lateral incisors and mandibular second premolars were the most commonly missing teeth. A trend away from space opening and prosthetic replacement toward orthodontic space closure was observed from 2000 to 2017/2018. This may reflect a change in attitude toward prosthetic replacement options and/or greater optimism with biomechanical strategies since the implementation of temporary anchorage devices to assist in space closure.

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Author notes

a

Senior Lecturer, Orthodontics, Dental School, The University of Western Australia, Nedlands, Australia.

b

Dental Student, Dental School, The University of Western Australia, Nedlands, Australia.

c

Associate Professor, Orthodontics, Dental School, The University of Western Australia, Nedlands, Australia.

d

Head, Division, School of Population and Global Health, Faculty of Health and Medical Sciences, The University of Western Australia, Nedlands, Australia.

e

Associate Professor, Mathematics and Statistics, Faculty of Engineering and Mathematical Sciences, The University of Western Australia, Nedlands, Australia.

f

Head, Program Director, Orthodontics, Dental School, The University of Western Australia, Nedlands, Australia.