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Abstract：
BACKGROUND: To evaluate the incidence and severity of open gingival embrasures (OGEs) in adult patients treated with clear aligners and fixed appliances.
METHODS: Two hundred non-extraction adult subjects with less than 5 mm of crowding (mean age, 24.6 ± 3.8 years) were enrolled in this retrospective study. The subjects were divided into the clear aligner (n = 100) and fixed appliance group (n = 100). The intraoral photographs were utilized to determine the incidence of OGEs in the upper arch between maxillary central incisors, as well as the lower arch between mandibular central incisors. Crown overlap, crown shape, posttreatment root angulation, the distance from the interproximal contact point (ICP) to the alveolar bone crest (ABC) after treatment and interproximal enamel reduction (IPR) were determined in the two groups.
RESULTS: The incidence of OGEs between maxillary and mandibular central incisors after orthodontic treatment was 35.0% and 38.0% in the clear aligner group, respectively, significantly higher than that (18.0% and 24.0%) in the fixed appliance group (P < 0.05). The average area of an OGE after clear aligner treatment was larger both in the maxilla (0.16 ± 0.12mm2) and mandible (0.21 ± 0.24mm2) compared with that (0.05 ± 0.03mm2 and 0.05 ± 0.06mm2) after fixed appliance treatment (P < 0.05). No difference was found regarding pretreatment crown overlap, crown shape, treatment duration, posttreatment root angulation, amount and distribution of IPR and the distance from ICP to ABC.
CONCLUSIONS: The incidence and severity of OGEs were higher in adults treated with clear aligners. Clinicians should be aware of the risk of OGEs during treatment with clear aligners.
METHODS: Two hundred non-extraction adult subjects with less than 5 mm of crowding (mean age, 24.6 ± 3.8 years) were enrolled in this retrospective study. The subjects were divided into the clear aligner (n = 100) and fixed appliance group (n = 100). The intraoral photographs were utilized to determine the incidence of OGEs in the upper arch between maxillary central incisors, as well as the lower arch between mandibular central incisors. Crown overlap, crown shape, posttreatment root angulation, the distance from the interproximal contact point (ICP) to the alveolar bone crest (ABC) after treatment and interproximal enamel reduction (IPR) were determined in the two groups.
RESULTS: The incidence of OGEs between maxillary and mandibular central incisors after orthodontic treatment was 35.0% and 38.0% in the clear aligner group, respectively, significantly higher than that (18.0% and 24.0%) in the fixed appliance group (P < 0.05). The average area of an OGE after clear aligner treatment was larger both in the maxilla (0.16 ± 0.12mm2) and mandible (0.21 ± 0.24mm2) compared with that (0.05 ± 0.03mm2 and 0.05 ± 0.06mm2) after fixed appliance treatment (P < 0.05). No difference was found regarding pretreatment crown overlap, crown shape, treatment duration, posttreatment root angulation, amount and distribution of IPR and the distance from ICP to ABC.
CONCLUSIONS: The incidence and severity of OGEs were higher in adults treated with clear aligners. Clinicians should be aware of the risk of OGEs during treatment with clear aligners.
摘要：
背景：评估使用透明矫正器和固定矫正器治疗的成年患者中开放式牙龈鳞片（OGE）的发生率和严重程度。
方法：两百名拥挤度小于5毫米的非拔牙成年受试者（平均年龄，24.6±3.8年）纳入这项回顾性研究。将受试者分为透明矫正器组(n=100)和固定矫正器组(n=100)。口内照片用于确定上颌中切牙之间上弓OGE的发生率，以及下颌中切牙之间的下弓。表冠重叠,冠形,治疗后根角，测定两组治疗后从邻间接触点(ICP)到牙槽骨嵴(ABC)的距离以及邻间釉质减少(IPR).
结果:正畸治疗后上颌和下颌中切牙OGEs的发生率分别为35.0%和38.0%,分别,显著高于固定矫治器组的18.0%和24.0%(P<0.05)。与固定矫治器治疗后的（0.05±0.03mm2和0.05±0.06mm2）相比，上颌骨（0.16±0.12mm2）和下颌骨（0.21±0.24mm2）的OGE平均面积更大（P<0.05）。没有发现关于预处理冠重叠的差异，冠形,治疗持续时间,治疗后根角，知识产权的数量和分布以及ICP到ABC的距离。
结论：使用透明对准剂治疗的成人OGEs的发生率和严重程度更高。临床医生应该意识到在使用清晰的对准器治疗期间OGE的风险。
方法：两百名拥挤度小于5毫米的非拔牙成年受试者（平均年龄，24.6±3.8年）纳入这项回顾性研究。将受试者分为透明矫正器组(n=100)和固定矫正器组(n=100)。口内照片用于确定上颌中切牙之间上弓OGE的发生率，以及下颌中切牙之间的下弓。表冠重叠,冠形,治疗后根角，测定两组治疗后从邻间接触点(ICP)到牙槽骨嵴(ABC)的距离以及邻间釉质减少(IPR).
结果:正畸治疗后上颌和下颌中切牙OGEs的发生率分别为35.0%和38.0%,分别,显著高于固定矫治器组的18.0%和24.0%(P<0.05)。与固定矫治器治疗后的（0.05±0.03mm2和0.05±0.06mm2）相比，上颌骨（0.16±0.12mm2）和下颌骨（0.21±0.24mm2）的OGE平均面积更大（P<0.05）。没有发现关于预处理冠重叠的差异，冠形,治疗持续时间,治疗后根角，知识产权的数量和分布以及ICP到ABC的距离。
结论：使用透明对准剂治疗的成人OGEs的发生率和严重程度更高。临床医生应该意识到在使用清晰的对准器治疗期间OGE的风险。
