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

Head & Face Medicine

Ehab A. Abdulghani¹  Hasan M. Sharhan¹  Waseem Saleh Al-Gumaei¹  BaoCheng Cao¹  Abeer A. Al-Sosowa²  Abeer A. Almashraqi³  Hanan Al-fakeh⁴  Maged Sultan Alhammadi⁵ 

[1] Department of Orthodontics and Dentofacial Orthopedics, College of Dentistry, Lanzhou University;Department of Periodontics, Faculty of Dentistry, Thamar University;Department of Pre-clinical Oral Health Sciences, College of Dental Medicine, QU Health, Qatar University;Department of Prosthodontics, School of Stomatology, Lanzhou University;Division of Orthodontics and Dentofacial Orthopedics, Department of Preventive Dental Sciences, College of Dentistry, Jazan University;

关键词: Cone beam computed tomography (CBCT);    Maxillary sinus floor (MSF);    Posterior maxillary teeth (PMT);    Intrusion;    Skeletal classes;   

DOI  :  10.1186/s13005-022-00316-3

来源: DOAJ

【 摘 要 】

Abstract Background Understanding the anatomical relationship between the maxillary sinus floor (MSF) and the posterior maxillary teeth (PMT) is important when planning the orthodontic intrusion of the posterior teeth. This study aimed to determine the vertical relationship between posterior maxillary teeth and maxillary sinus floor in different skeletal classes in the Chinese adult population. Methods This is a retrospective cross-sectional study involved cone beam computed tomography images of 298 adult patients (145 males and 153 females) between 20 and 45 years old. The sample was categorized according to A point, Nasion, B point (ANB) angle into 102 Class I, 102 Class II, and 94 Class III malocclusion. Non-parametric Wilcoxon Mann–Whitney U and Kruskal–Wallis tests were used to compare the studied groups. The Intra-class Correlation Coefficient (ICC) was used to assess the intra- and inter-observer reliability analysis. Results Overall, there was a statistically significant difference in the mean distance between both genders (P < 0.001). The measured distance increased with age in all posterior tooth roots (P < 0.001). The root apex in the sagittal view appeared to be closer to the maxillary sinus than in the coronal view; 2.2 ± 4.3 and 3.1 ± 5.5 mm, respectively. The most frequent root scores were Type 1 and Type 2P. In both sagittal and coronal views, Class I demonstrated a higher Type 2P prevalence, whereas Class III showed a lower prevalence. The second molars’ mesiobuccal root had the largest number of penetration in the three examined skeletal classes. Conclusions Maxillary molars of Class I malocclusion with the majority of Type 2P root-sinus relationship have the highest possible risk of root resorption during molar intrusion due to cortical bone encroachment, while Class III malocclusion showed the least possible risk.

【 授权许可】

Unknown