Assessment of Bone Thickness in the Infrazygomatic Crest and Proper Insertion Angle for Miniscrew Positioning: A Retrospective CBCT Study
试验速览
- 阶段
- 不适用
- 状态
- 已完成
- 入组人数
- 95
- 试验地点
- 1
- 主要终点
- measure bone thickness of infrazygomatic crest
研究概览
简要总结
This study will be done on 95 patients with CBCTs retrospectively, to evaluate the bone depth of infrazygomatic crest region for selecting suitable size of miniscrews and proper insertion angle clinical guide in the infrazygomatic crest without injuring the mesiobuccal root of the maxillary first molar.
详细描述
CBCTs of 95 patients were collected retrospectively from archives of Faculty of Dentistry, Cairo University, that were requested for different dental purposes. The thickness of the IZC was measured above mesio-buccal root of upper 6 (U6MB), above disto-buccal root of upper 6 (U6DB) and contact point between upper 6 and 7 roots (U6-7). The distance from point of entry of miniscrew to the occlusal plane, that saves roots from injury, was measured. Then, the angle of miniscrew insertion in relation to the occlusal plane was measured at maximum thickness available together with point of entry in relation to the occlusal plane. The IZC thickness of right and left sides of each patient was compared, also compared in males and females. Kruskal-Wallis test, Paired Wilcoxon signed rank test & Spearman correlation were used to analyze results
研究设计
- 研究类型
- Observational
- 观察模型
- Case Only
- 时间视角
- Retrospective
入排标准
- 年龄范围
- 16 Years 至 35 Years（Child, Adult）
- 性别
- All
- 接受健康志愿者
- 否
入选标准
- •Patients having full permanent dentition
- •all cases were indicated for CBCT for their orthodontic treatment
- •Patients with sound dentition
排除标准
- •craniofacial anomalies and facial asymmetries
- •Unclear CBCT
- •mixed dentition
- •Patients with systemic bone disorders
结局指标
主要结局
measure bone thickness of infrazygomatic crest
时间窗: from enrollment to the end of taking measurements at 8 weeks
the bone thickness will be measured on CBCT from coronal slice at 3 points : above mesio-buccal root of upper first molar, above disto-buccal root of upper first molar and between upper first and second molars contact points
次要结局
- proper angulation of miniscrew insertion(from enrollment to the end of taking measurements at 8 weeks)
- check asymmetry of right and left sides per patient(from enrollment to the end of taking measurements at 8 weeks)