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拔除四颗前磨牙治疗安氏II类1分类错牙合患者的第三磨牙角度变化：一项回顾性研究

Third Molar Angulation Changes in Class II Div I Malocclusion Subjects Treated with Extraction of Four Premolars: A Retrospective Study.

作者信息

Shashidhar Keerthan, Castelino Chrysl Karishma, Kuttappa M N, Nair Rohit A, Soans Crystal Runa, Nair Harikrishnan S

机构信息

Department of Orthodontics and Dentofacial Orthopaedics, A B Shetty Memorial Institute of Dental Sciences, Nitte (Deemed to be University), Mangalore, Karnataka, India.

Department of Oral and Maxillofacial Surgery, Father Muller Medical College and Hospital, Mangalore, Karnataka, India.

出版信息

J Int Soc Prev Community Dent. 2020 Sep 28;10(5):591-596. doi: 10.4103/jispcd.JISPCD_342_19. eCollection 2020 Sep-Oct.

DOI:10.4103/jispcd.JISPCD_342_19
PMID:33282768
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC7685268/
Abstract

AIM

The aim of this study was to assess the changes in maxillary and mandibular third molar inclinations in individuals with class II div 1 malocclusion, before and after orthodontic treatment with extraction of all four first premolars.

MATERIALS AND METHODS

This retrospective study consisted of the pretreatment and posttreatment records of 30 patients that were obtained from the archives of the department of orthodontics and dentofacial orthopedics in A B Shetty Memorial Institute of Dental Sciences. The maxillary third molar's relation to the palatal plane and the mandibular third molar's relation to the mandibular plane were measured. The paired test was used to calculate pre- and posttreatment changes. A value of < 0.05 was considered to be statistically significant.

RESULTS

The maxillary third molars showed a mean correction of 6.15° ( < 0.001) and the mandibular third molars showed a mean correction of 5.10° ( < 0.001).

CONCLUSION

Maxillary third molars showed more uprighting when compared to the mandibular third molars and that both maxillary and mandibular third molars showed an improvement in their angulations to their respective planes after extraction of the first premolars. However, the results of the study cannot be analyzed to state if the third molars do become fully functional.

摘要

目的

本研究旨在评估拔除全部四颗第一前磨牙进行正畸治疗前后，安氏II类1分类错牙合患者上颌和下颌第三磨牙倾斜度的变化。

材料与方法

这项回顾性研究包括从A B谢蒂纪念牙科学院正畸与牙颌面矫形科档案中获取的30例患者的治疗前和治疗后记录。测量上颌第三磨牙与腭平面的关系以及下颌第三磨牙与下颌平面的关系。采用配对t检验计算治疗前和治疗后的变化。P<0.05被认为具有统计学意义。

结果

上颌第三磨牙平均矫正6.15°（P<0.001），下颌第三磨牙平均矫正5.10°（P<0.001）。

结论

与下颌第三磨牙相比，上颌第三磨牙直立程度更高，并且在拔除第一前磨牙后，上颌和下颌第三磨牙相对于各自平面的倾斜度均有所改善。然而，本研究结果无法分析第三磨牙是否会完全发挥功能。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/807c/7685268/9e41081181aa/JISPCD-10-591-g002.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/807c/7685268/78e3868f2ff1/JISPCD-10-591-g001.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/807c/7685268/9e41081181aa/JISPCD-10-591-g002.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/807c/7685268/78e3868f2ff1/JISPCD-10-591-g001.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/807c/7685268/9e41081181aa/JISPCD-10-591-g002.jpg

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