Department of Orthodontics and Dentofacial Orthopedics, Dental School, Medical Faculty, University of Geneva, Geneva, Switzerland.
Department of Orthodontics and Dentofacial Orthopedics, Dental School, Medical Faculty, University of Geneva, Geneva, Switzerland.
Am J Orthod Dentofacial Orthop. 2023 Jun;163(6):786-792. doi: 10.1016/j.ajodo.2022.06.027. Epub 2023 Jan 16.
This study aimed to evaluate potential vertical changes in the position of the maxillary labial frenum (MLF) insertion in growing children and to compare these changes to the vertical growth of the dentoalveolar process and lower facial third.
This retrospective longitudinal study investigated records of 33 healthy children. Dental casts, lateral cephalograms, and photographs were evaluated at pretreatment (T0), posttreatment (T1), and 3-5 years into retention (T2). To evaluate the vertical changes of MLF insertion in relation to the vertical growth of the dentoalveolar process, the palatal plane (PP) was used as a reference. These changes were also compared between different MLF typologies (ascribed as thin or fibrous).
The distance from MLF to PP only slightly increased from T0 to T2 by 0.6 ± 0.5 mm (P <0.001), whereas the distance between the incisal edge and PP increased significantly from T0 to T2 by 2.6 ± 0.8 mm (P <0.001). A positive correlation was found (r = 0.94; P <0.001) between the changes from the incisal edge to the PP and the MLF to the incisal edge between T0 and T2. No correlation was found between the change from the incisal edge to the PP and MLF to PP between T0 and T2. Thin MLF types showed a larger increase in distance from their insertion to the incisal edge (2.6 ± 0.8 mm) than thick MLF types (1.8 ± 0.7; P <0.03).
The MLF remains stable compared with the PP, whereas the maxillary incisal edge moves away from the PP, indicating increased vertical growth of the alveolar process. Dentists should be aware of those changes before performing interventions such as unnecessary frenectomies.
本研究旨在评估生长中的儿童上唇系带（MLF）附着位置的潜在垂直变化，并将这些变化与牙牙槽骨和下面部第三部分的垂直生长进行比较。
这是一项回顾性纵向研究，共纳入了 33 名健康儿童的记录。在治疗前（T0）、治疗后（T1）和 3-5 年保持期（T2）时，分别对牙模、侧位头颅侧位片和照片进行评估。为了评估 MLF 附着的垂直变化与牙牙槽骨的垂直生长之间的关系，我们使用腭平面（PP）作为参考。我们还比较了不同 MLF 类型（纤细或纤维状）之间的这些变化。
从 T0 到 T2，MLF 到 PP 的距离仅增加了 0.6 ± 0.5 毫米（P <0.001），而切牙切缘到 PP 的距离从 T0 到 T2 显著增加了 2.6 ± 0.8 毫米（P <0.001）。我们发现，从切牙切缘到 PP 的变化与从 T0 到 T2 期间 MLF 到切牙切缘的变化之间存在正相关关系（r = 0.94；P <0.001）。然而，我们没有发现从切牙切缘到 PP 的变化与从 T0 到 T2 期间 MLF 到 PP 的变化之间存在相关性。薄 MLF 类型的 MLF 附着到切牙切缘的距离增加（2.6 ± 0.8 毫米）比厚 MLF 类型的距离增加（1.8 ± 0.7 毫米）更大（P <0.03）。
与 PP 相比，MLF 保持稳定，而上颌切牙切缘远离 PP，表明牙槽骨的垂直生长增加。牙医在进行不必要的系带切除术等干预措施之前应该意识到这些变化。
