Variability associated with maxillary infrazygomatic crest and palatal bone width, height, and angulation in subjects with different vertical facial growth types: a retrospective cone-beam computed tomography study.

Bhumika Patel, Jessica De Rose, Jansen Nash, Michael Sekula, Carl Gioia, Toru Deguchi, Sudha Gudhimella, Vaibhav Gandhi
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Abstract

Objectives: To assess the infrazygomatic crest (IZC) and palatal bone width, height, and angulation in patients with different vertical facial growth types as potential miniscrew insertion sites.

Materials and methods: In this retrospective cone-beam computed tomography study, 162 subjects (81 males and 81 females, mean age 16.05 ± 0.65 years) were included. They were divided into three groups (hypodivergent, normodivergent, and hyperdivergent) based on the Frankfort mandibular plane angle. Ten buccal bone measurements were made at two different coronal sections: maxillary first molar mesiobuccal and distobuccal roots (bilaterally). Six palatal bone measurements were made on a sagittal section at the maxillary central incisors (bilaterally). A total of 32 measurements per subject were considered in the study.

Results: No significant difference was observed for the IZC (width and angle) at the maxillary first molar mesiobuccal root. A comparison of normodivergent and hyperdivergent groups for buccal width at the distobuccal root of the first molar showed significant differences. Palatal bone thickness at the level of 2 mm distal to the apex of the central incisor was significantly higher for the hyperdivergent group (10.43 mm) compared with the normodivergent (7.58 mm) and hypodivergent groups (7.83 mm).

Conclusions: Hyperdivergent subjects tend to present a longer and deeper IZC and increased palatal bone thickness compared with other groups. The recommended insertion angle for the IZC mini-implant at 3 mm from the alveolar crest should be between 75.5° and 77°.

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面部垂直生长类型不同的受试者上颌骨下颧嵴和腭骨宽度、高度和角度的相关变异性:一项锥形束计算机断层扫描回顾性研究。
目的:评估颧骨下嵴(IZC)和腭骨的宽度、高度和角度:评估不同面部垂直生长类型患者的颧骨下嵴(IZC)和腭骨宽度、高度和角度,作为潜在的微型螺钉插入部位:在这项回顾性锥形束计算机断层扫描研究中,共纳入了 162 名受试者(81 名男性和 81 名女性,平均年龄为 16.05 ± 0.65 岁)。根据法兰克福下颌平面角度将他们分为三组(低发散、正常发散和高发散)。在两个不同的冠状切面进行了十次颊骨测量:上颌第一磨牙中颊根和远颊根(双侧)。在上颌中切牙(双侧)的矢状切面上进行了六次腭骨测量。研究共对每个受试者进行了 32 次测量:结果:上颌第一磨牙中颊面根部的 IZC(宽度和角度)无明显差异。在第一磨牙远颊面根部的颊面宽度方面,正常分化组和过度分化组的比较显示出显著差异。与正常发散组(7.58 毫米)和低发散组(7.83 毫米)相比,超发散组距中切牙先端远端 2 毫米处的腭骨厚度(10.43 毫米)明显更高:结论:与其他组别相比,超发散受试者的 IZC 更长、更深,腭骨厚度增加。建议IZC微型种植体在距牙槽嵴3毫米处的插入角度应在75.5°和77°之间。
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