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. 2024 Feb 1;16(2):e137-e144.
doi: 10.4317/jced.61064. eCollection 2024 Feb.

Effect of orthodontic premolar extraction on maxillary teeth angulation and arch dimensions in adolescent patients: A 3-D digital model analysis

Ahmed Abohabib  1 , Maria J Viñas  2 , Josep M Ustrell  3
Affiliations

Effect of orthodontic premolar extraction on maxillary teeth angulation and arch dimensions in adolescent patients: A 3-D digital model analysis

Ahmed Abohabib et al. J Clin Exp Dent. .

Abstract

Background: Therapeutic orthodontic premolar extraction is a common orthodontic treatment, yet the extent of its impact on the upper dental arch dimensions and teeth angulations is still under exploration. Hypothesis: We postulated that the therapeutic extraction of orthodontic premolars significantly alters the orientation of teeth and the dimensions of the dental arch. Objective: This study assessed the impact of therapeutic orthodontic premolar extraction on dental arch dimensions and tooth angulations.

Material and methods: We conducted a retrospective cohort study involving 30 patients who underwent bilateral upper premolar extraction and fixed appliance treatment. Pre and post-treatment dental casts were scanned, and changes in tooth angulations and arch dimensions were evaluated using 3D digital maxillary models. Statistical analyses encompassed the application of paired samples t-test.

Results: Significant post-treatment changes were observed, including distal tipping in anterior teeth, minor mesial tipping in first molars, and a reduction in torque for central incisors and canines. Dental arch dimensions were also influenced, with increased width and depth between the canines and decreased width between the second premolars while inter-molar width and overall arch depth significantly reduced post-treatment.

Conclusions: Therapeutic orthodontic premolar extraction significantly affects dental arch dimensions and tooth angulations. These findings have implications for treatment planning and predicting changes associated with orthodontic treatments involving premolar extraction. Key words:3D digital models - orthodontic premolar extraction - teeth angulation - dental arch dimensions.

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Conflict of interest statement

Conflicts of interest Authors declare that they have no conflict of interest to disclose.

Figures

Figure 1
Figure 1
Image displaying teeth landmarks
Figure 2
Figure 2
Image displaying some arch dimensions measurements changes, in the left pre-treatment and in the right post-treatment models.
Figure 3
Figure 3
Diagram displaying conclusion of the results.
See this image and copyright information in PMC

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References

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