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Abstract：
Background: An accurate determination of the biological width and the relationship of the cemento-enamel junction with the border of the alveolar bone is crucial during a clinical crown-lengthening (CCL) procedure. The aim of this study was to present a technical note about the retraction techniques in cone beam computed tomography (CBCT) prior to CCL, highlighting the significant enhancement in procedural accuracy and predictability that these techniques offer. Methods: Clinical and radiological examinations should be performed before a CCL procedure. It is necessary to determine the length of the tooth crowns, the periodontal pockets\' depth, and the phenotype of the gingiva. The ideal CBCT examination should be performed with soft tissue retraction. This can be achieved using retractors or cotton rolls. Results: Retraction of the lips, cheeks, and tongue allows one to assess the marginal gingiva, the cemento-enamel junction, and the alveolar bone. A detailed plan of the CCL procedure, which involves retraction, ensures both the aesthetic appeal and the achievement of a newly defined gingival zenith, enhancing the overall visual harmony. Conclusions: Compared with conventional radiographic imaging, the soft tissue retraction maneuver in CBCT prior to CCL surgery offers an effective approach to the evaluation and diagnosis of soft and hard tissue. This is because of the detailed planning of the aesthetic CCL procedure. Such an approach leads to superior aesthetic outcomes in dentistry, contributing to the advancement of aesthetic dentistry through a harmonious blend of art and science.
摘要：
背景：在临床牙冠延长术（CCL）过程中，准确确定生物宽度以及牙釉质与牙槽骨边界的关系至关重要。本研究的目的是提出关于在CCL之前的锥形束计算机断层扫描（CBCT）中的缩回技术的技术说明，强调这些技术提供的程序准确性和可预测性的显著提高。方法：CCL手术前应进行临床和放射学检查。有必要确定牙冠的长度，牙周袋的深度，和牙龈的表型。理想的CBCT检查应在软组织回缩的情况下进行。这可以使用卷收器或棉卷来实现。结果：嘴唇缩回，脸颊,舌头可以评估牙龈边缘，牙骨质-釉质交界处,还有牙槽骨.CCL程序的详细计划，这涉及到撤回，确保美学吸引力和新定义的牙龈天顶的成就，增强整体视觉和谐。结论:与常规影像学相比,CCL手术前CBCT中的软组织回缩操作为评估和诊断软组织和硬组织提供了有效的方法。这是因为美学CCL程序的详细规划。这种方法导致牙科的卓越美学结果，通过艺术与科学的和谐融合，为牙科美学的进步做出贡献。
