Mandibular second molar extraction: A retrospective cohort study of spontaneous occlusal changes in adolescent patients

IF 1.7 3区医学 Q2 DENTISTRY, ORAL SURGERY & MEDICINE Orthodontics & Craniofacial Research Pub Date : 2024-03-05 DOI:10.1111/ocr.12772

Lucete Fernandes Færøvig, Nikolaos Pandis, Ama Johal, Vaska Vandevska-Radunovic

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Abstract

Objectives

Evaluate long-term spontaneous occlusal changes following L7 extraction in adolescent patients.

Materials and Methods

Study models of 144 participants (63 males, 81 females) retrospectively assessed prior to L7 extraction (9–16 years old; T1) and following L8 eruption (14–25 years old; T2). All received upper fixed appliances. A sub-group (n = 86) received no lower fixed appliances and acted as controls. Occlusal changes were compared between treatment (lower fixed appliance) and control (no lower fixed appliance) groups using PAR index. At T2, L8 occlusal outcome was assessed using ABO grading system.

Results

Mean follow-up period 6 (SD 2) years. At T1, lower scores observed in control group for Lower Anterior (P < .001), Midline (P = .033) and Lateral Segments (P = .040) components. At T2, lower scores continued being observed in control group for Midline (P < .001) and Lateral segment (P = .019) components. Higher decrease in Lower Anterior PAR scores observed in treatment group (<.001) with comparable scores between groups at T2 (P = .057). Similar PAR score changes between groups for Lateral Segments, Overjet and Overbite components. At T2, no significant difference observed in Total PAR score reduction between control (83%) and treatment (82%) groups. Good-to-acceptable occlusal outcome of the L8 observed in 81.55% of cases at T2 with no difference between groups.

Conclusion

In growing patients with mild mandibular crowding, extraction of L7 followed by upper fixed appliance therapy, leads to favourable occlusal changes over a 6-year follow-up period, with or without lower fixed appliance therapy, being an alternative extraction protocol where lower fixed appliance therapy is not recommended.

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下颌第二磨牙拔除术：青少年患者自发咬合变化的回顾性队列研究。

目标：评估青少年患者 L7 拔牙后的长期自发咬合变化：评估青少年患者L7拔除后的长期自发咬合变化：对 144 名参与者（63 名男性，81 名女性）的研究模型进行回顾性评估，包括 L7 拔除前（9-16 岁；T1）和 L8 长出后（14-25 岁；T2）。所有患者都接受了上部固定矫治器。一个子组（n = 86）没有接受下固定矫治器，作为对照组。使用 PAR 指数比较治疗组（下固定矫治器）和对照组（无下固定矫治器）的咬合变化。在第二阶段，使用 ABO 分级系统对 L8 咬合结果进行评估：平均随访时间为 6 年（标准差为 2 年）。结果：平均随访时间为 6 年（标准差为 2 年）：对于下颌轻度拥挤的生长期患者，无论是否使用下颌固定矫治器治疗，拔除 L7 后再使用上颌固定矫治器治疗，都能在 6 年的随访期内带来良好的咬合变化，是不推荐使用下颌固定矫治器治疗的另一种拔牙方案。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Orthodontics & Craniofacial Research 医学-牙科与口腔外科

CiteScore

5.30

自引率

3.20%

发文量

审稿时长

>12 weeks

期刊介绍： Orthodontics & Craniofacial Research - Genes, Growth and Development is published to serve its readers as an international forum for the presentation and critical discussion of issues pertinent to the advancement of the specialty of orthodontics and the evidence-based knowledge of craniofacial growth and development. This forum is based on scientifically supported information, but also includes minority and conflicting opinions. The objective of the journal is to facilitate effective communication between the research community and practicing clinicians. Original papers of high scientific quality that report the findings of clinical trials, clinical epidemiology, and novel therapeutic or diagnostic approaches are appropriate submissions. Similarly, we welcome papers in genetics, developmental biology, syndromology, surgery, speech and hearing, and other biomedical disciplines related to clinical orthodontics and normal and abnormal craniofacial growth and development. In addition to original and basic research, the journal publishes concise reviews, case reports of substantial value, invited essays, letters, and announcements. The journal is published quarterly. The review of submitted papers will be coordinated by the editor and members of the editorial board. It is policy to review manuscripts within 3 to 4 weeks of receipt and to publish within 3 to 6 months of acceptance.