Comparison of soft tissue changes between incisor tipping and translation after premolar extraction
백원경, 최성환, 차정열, 유형석, 이기준,
소속 상세정보
백원경 ( Baik Won-Kyeong ) - Yonsei University College of Dentistry Department of Orthodontics
최성환 ( Choi Sung-Hwan ) - Yonsei University College of Dentistry Department of Orthodontics
차정열 ( Cha Jung-Yul ) - Yonsei University College of Dentistry Department of Orthodontics
유형석 ( Yu Hyung-Seog ) - Yonsei University College of Dentistry Department of Orthodontics
이기준 ( Lee Kee-Joon ) - Yonsei University College of Dentistry Department of Orthodontics
Abstract
Objective: This study compared soft tissue changes after extraction of the four premolars followed by maximum retraction of the anterior teeth according to the type of anterior teeth movement: tipping and translation.
Methods: Patients who had undergone orthodontic treatment involving the extraction of four premolars were retrospectively selected and divided into either the tipping (n = 27) or translation (n = 26) groups based on the retraction of the incisor root apex and the axis changes of the incisors during the treatment period. Lateral pre- and post-treatment cephalograms were analyzed.
Results: There were no significant differences between the tipping and translation groups before treatment. The retraction amounts of the root apex of the upper and lower incisors in the tipping group were 0.33 and 0.26 mm, respectively, and 5.02 and 5.31 mm, respectively, in the translation group (p < 0.001). The posterior movements of soft tissue points A and B in the tipping group were 0.61 and 1.25 mm, respectively, and 1.10 and 3.25 mm, respectively, in the translation group (p < 0.01). The mentolabial sulcus angle increased by 5.89° in the tipping group, whereas it decreased by 8.13° in the translation group (p < 0.001).
Conclusions: An increased amount of retraction of the incisor root apex led to the increased posterior movement of soft tissue points A and B, and this appeared more distinct in cases involving the lower incisor and lower lip.
키워드
Tooth movement; Soft tissue; Tipping; Translation
원문 및 링크아웃 정보
등재저널 정보