Elhoseiny Yomna O, B Mostafa Raghdaa A, Elkassaby Marwa A, Abou-El-Fotouh Mona M
Department of Oral and Maxillofacial Radiology, Faculty of Dentistry, Ain Shams University, Cairo, Egypt.
Department of Oral and Maxillofacial Surgery, Faculty of Dentistry, Ain Shams University, Cairo, Egypt.
Ann Maxillofac Surg. 2019 Jul-Dec;9(2):359-363. doi: 10.4103/ams.ams_34_19.
The aim of this study was to compare the number of teeth in the premaxilla (cleft area) and to assess the presence of tooth agenesis with the ultimate goal of finding whether differences existed in the two suggested subtypes of nonsyndromic bilateral cleft lip and palate (BCLP) patients.
A retrospective comparative study was conducted, where cone- beam computed tomography (CBCT) images of 22 BCLP patients (10 males and 12 females, with age range 8 to 14, mean age 9.6 years) obtained from archive of Cleft Clinic, affiliated to the Oral and Maxillofacial Surgery department, Ain-Shams University, Cairo, Egypt were assessed.
CBCT images were divided into two subtypes: Group (P) - this represents BCLP characterized by well-developed (P) prominent premaxilla and SNA >80 ± 2 and Group (R) - this represents BCLP characterized by ill-developed (R) rudimentary premaxilla and SNA <80 ± 2. The number of teeth in the premaxilla was evaluated, and the presence of agenesis in the premaxilla and posterior segments was documented.
Unpaired-Student's -test was used to compare the number of teeth among the two groups and to test significance at < 0.05. Intraobserver agreement was assessed using alpha (Cronbach) reliability analysis. A descriptive analysis using percentages was performed to characterize tooth agenesis.
A significant difference was found in the number of teeth in the premaxilla among Group R and Group P. Maxillary lateral incisor showed the highest percentage of agenesis in the two groups followed by the maxillary second premolar.
The number of teeth might be useful in differentiating different subtypes of nonsyndromic BCLP.
本研究旨在比较前颌骨（腭裂区域）的牙齿数量，并评估牙发育不全的情况，最终目的是确定非综合征性双侧唇腭裂（BCLP）患者的两种亚型之间是否存在差异。
进行了一项回顾性比较研究，评估了从埃及开罗艾因夏姆斯大学口腔颌面外科附属腭裂诊所存档中获取的22例BCLP患者（10例男性和12例女性，年龄范围8至14岁，平均年龄9.6岁）的锥形束计算机断层扫描（CBCT）图像。
CBCT图像分为两个亚型：组（P）——代表具有发育良好（P）突出前颌骨且SNA>80±2的BCLP；组（R）——代表具有发育不良（R）原始前颌骨且SNA<80±2的BCLP。评估前颌骨的牙齿数量，并记录前颌骨和后段牙发育不全的情况。
采用非配对学生t检验比较两组之间的牙齿数量，并在P<0.05时检验显著性。使用α（克朗巴赫）可靠性分析评估观察者间一致性。采用百分比进行描述性分析以表征牙发育不全情况。
在R组和P组之间，前颌骨的牙齿数量存在显著差异。上颌侧切牙在两组中牙发育不全的比例最高，其次是上颌第二前磨牙。
牙齿数量可能有助于区分非综合征性BCLP的不同亚型。
