Abstract：
OBJECTIVE: This prospective randomized clinical trial was designed to compare the apical U-shape splitting technique (AUST) combined with guided bone regeneration (GBR) vs GBR alone for horizontal bone augmentation in maxillary labial undercut areas.
METHODS: The study included twelve patients with labial undercuts that made their alveolar ridges not able to compass dental implants. They received a total of 14 dental implants in the anterior maxilla where 7 (group I) were placed after AUST with GBR and the other 7 (group II) after the conventional GBR. The clinical and radiographic evaluations were done preoperatively, after surgery, and 6 months later. Facial flap fracture, peri-implant health, ridge width (RW) gain and loss, marginal bone loss (MBL), and implant esthetics were measured. Data were analyzed and compared and for any of the used tests, results were considered statistically significant if p-value ≤ 0.05.
RESULTS: For group I, no fracture of the bone flap happened and the gain in RW was significantly higher at 6 months postoperatively. Marginal bone loss was similar for both groups. The total pink esthetic score was significantly higher in group I vs group II (p = 0.024).
CONCLUSIONS: Within the limitations of this study, it was concluded that AUST combined with GBR was more effective in RW gain than GBR alone and it provided a merit approach for restoring function and esthetics if labial fenestration was unavoidable during implant placement.
CONCLUSIONS: Apical U-shape splitting technique for horizontal ridge augmentation is a valuable option for the benefit of patients in clinics who need dental implants and have anterior undercut areas that may lead to fenestration and usually requires onlay bone grafting which is less successful in maintaining the RW.
METHODS: The study included twelve patients with labial undercuts that made their alveolar ridges not able to compass dental implants. They received a total of 14 dental implants in the anterior maxilla where 7 (group I) were placed after AUST with GBR and the other 7 (group II) after the conventional GBR. The clinical and radiographic evaluations were done preoperatively, after surgery, and 6 months later. Facial flap fracture, peri-implant health, ridge width (RW) gain and loss, marginal bone loss (MBL), and implant esthetics were measured. Data were analyzed and compared and for any of the used tests, results were considered statistically significant if p-value ≤ 0.05.
RESULTS: For group I, no fracture of the bone flap happened and the gain in RW was significantly higher at 6 months postoperatively. Marginal bone loss was similar for both groups. The total pink esthetic score was significantly higher in group I vs group II (p = 0.024).
CONCLUSIONS: Within the limitations of this study, it was concluded that AUST combined with GBR was more effective in RW gain than GBR alone and it provided a merit approach for restoring function and esthetics if labial fenestration was unavoidable during implant placement.
CONCLUSIONS: Apical U-shape splitting technique for horizontal ridge augmentation is a valuable option for the benefit of patients in clinics who need dental implants and have anterior undercut areas that may lead to fenestration and usually requires onlay bone grafting which is less successful in maintaining the RW.
摘要：
目的：这项前瞻性随机临床试验旨在比较根尖U形劈开技术（AUST）结合引导骨再生（GBR）与GBR单独用于上颌唇底切区域水平骨增强的差异。
方法：该研究包括12名患者，他们的唇底切使他们的牙槽不能适应牙科植入物。他们在前上颌骨总共接受了14种牙种植体，其中7种（I组）在AUST后与GBR放置，另外7种（II组）在常规GBR之后放置。术前进行临床和影像学评估，手术后,6个月后。面部皮瓣骨折,种植体周围的健康，脊宽(RW)增益和损耗，边缘骨丢失（MBL），和植入物的美学进行了测量。对数据进行了分析和比较，对任何使用的测试，如果p值≤0.05,则认为结果具有统计学意义.
结果：对于I组，骨瓣无骨折发生，术后6个月RW增益明显增高。两组的边缘骨丢失相似。I组与II组的总粉红色美学评分明显高于II组（p=0.024）。
结论：在本研究的局限性内，结论是AUST联合GBR在RW增益方面比单独GBR更有效,并且如果在植入物放置期间阴唇开窗是不可避免的,它为恢复功能和美学提供了一种有益的方法.
结论：用于水平隆脊的根尖U形劈开技术是一种有价值的选择，对于需要种植牙的患者来说是一个有价值的选择，这些患者的前牙切切区域可能会导致开窗，并且通常需要在维持RW方面不太成功的植骨。
方法：该研究包括12名患者，他们的唇底切使他们的牙槽不能适应牙科植入物。他们在前上颌骨总共接受了14种牙种植体，其中7种（I组）在AUST后与GBR放置，另外7种（II组）在常规GBR之后放置。术前进行临床和影像学评估，手术后,6个月后。面部皮瓣骨折,种植体周围的健康，脊宽(RW)增益和损耗，边缘骨丢失（MBL），和植入物的美学进行了测量。对数据进行了分析和比较，对任何使用的测试，如果p值≤0.05,则认为结果具有统计学意义.
结果：对于I组，骨瓣无骨折发生，术后6个月RW增益明显增高。两组的边缘骨丢失相似。I组与II组的总粉红色美学评分明显高于II组（p=0.024）。
结论：在本研究的局限性内，结论是AUST联合GBR在RW增益方面比单独GBR更有效,并且如果在植入物放置期间阴唇开窗是不可避免的,它为恢复功能和美学提供了一种有益的方法.
结论：用于水平隆脊的根尖U形劈开技术是一种有价值的选择，对于需要种植牙的患者来说是一个有价值的选择，这些患者的前牙切切区域可能会导致开窗，并且通常需要在维持RW方面不太成功的植骨。
