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Three-dimensional assessment of the favorability of maxillary posterior teeth intrusion in different facial patterns limited by the vertical relationship with the maxillary sinus floor

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Abstract

Objective

Posterior teeth intrusion is one of the best treatment options for treatment of skeletal open bite in adults; the surrounding anatomical landmarks are one of the restraining factors. This study aimed to assess the vertical relationship between the maxillary posterior teeth (MPT) and the maxillary sinus floor (MSF) in different facial growth patterns in the Chinese adult population.

Materials and methods

Cone beam computed tomography images of 298 patients, 145 males and 153 females aged between 20 and 45 years, were analyzed. Based on Jarabak ratio and the mandibular plane inclination, the sample was categorized into 94 hyperdivergent, 102 hypodivergent, and 102 normodivergent facial patterns subjects. The vertical relationship between the root-apex distances were classified as favorable, indicating no contact (type 1), or unfavorable, indicating roots in contact (type 2) for the posterior teeth intrusion. The relationship in the unfavorable group was subdivided into three subgroups (T2C, T2LC, and T2P). Comparative statistical tests were done related to age, gender, tooth side, and type of multiplanar view (sagittal and coronal). The significant level was set to be P < 0.05.

Results

There was a statistically significant difference in the mean distance between both genders in the hyperdivergent group (P < 0.001). The measured distance increased with age in all tooth roots (P < 0.001). In both sagittal and coronal views, the most frequent root scores were type 1 and type 2p (54.2%, 27.5%) and (55.1%, 21.4%), respectively. The hyperdivergent group demonstrated a higher prevalence of type 2P (31.6% and 25.5%), whereas the hypodivergent group showed a lower prevalence (25.1% and 19.2%); furthermore, the second molar’s mesiobuccal root in hyperdivergent patients showed the closest distance to the maxillary sinus in sagittal and coronal views, 0.3 ± 3.7 and 0.4 ± 3.1 mm, respectively.

Conclusions

Maxillary molars of hyperdivergent patients have the highest possible risk of root resorption due to the possible risk of cortical bone encroachment, while hypodivergent patients have the least possible risk.

Clinical relevance

Analysis of apex-sinus distances can be of great help for safe posterior teeth intrusion and providing correct and adequate treatment.

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Funding

The author(s) disclosed receipt of the following financial support for the research, authorship, and/or publication of this article: This study is supported by The Natural Foundation of Gansu Province, China (1208RJZA236), the Key Technology Plane Program of Gansu Province, China (20YF8FA071), and the Key Technology Support Program of Gansu Province, China (1604FKCA089).

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Authors and Affiliations

Authors

Contributions

Conceptualization, Ehab A. Abdulghani, Abeer A. Al-Sosowa, and Maged Alhammadi and BaoCheng Cao. Data curation, Abeer A. Al-Sosowa, Abeer A. Almashreqi, Hasan M. Sharhan, and Hanan Al_fakeh.Formal analysis, Ehab A. Abdulghani. Investigation, Ehab A. Abdulghani. Methodology, Ehab A. Abdulghani and Abeer A. Almashreqi. Project administration, Ehab A. Abdulghani and BaoCheng Cao.; Resources, Ehab A. Abdulghani, and Abeer A. Al-Sosowa. Software, Ehab A. Abdulghani. Supervision, BaoCheng Cao. Validation, Ehab A. Abdulghani and Maged Alhammadi. Visualization, Ehab A. Abdulghani. Writing—original draft, Abeer A. Al-Sosowa, Abeer A. Almashreqi, Hasan M. Sharhan, and Hanan Al_fakeh. Writing—review and editing, Ehab A. Abdulghani, Maged Alhammadi, and BaoCheng Cao. All authors have read and agreed to the published version of the manuscript.

Corresponding author

Correspondence to BaoCheng Cao.

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Ethics approval

This is a retrospective cross-sectional study approved by the Institutional Ethical Committee (LZUKQ-2021–020) at the Hospital of Stomatology in Lanzhou University, China.

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The requirement for informed consent was waived due to the retrospective nature of the study.

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The authors declare no competing interests.

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Abdulghani, E.A., Alhammadi, M.S., Al-Sosowa, A.A. et al. Three-dimensional assessment of the favorability of maxillary posterior teeth intrusion in different facial patterns limited by the vertical relationship with the maxillary sinus floor. Clin Oral Invest 26, 4905–4915 (2022). https://doi.org/10.1007/s00784-022-04458-1

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