Efficiency of anterior tooth intrusion in deep overbite cases with clear aligners: analysis via the indirect model superimposition method

doi:10.12307/2026.385

Abstract

Abstract: BACKGROUND: Anterior tooth intrusion is commonly used in the deep overbite cases with clear aligners. However, the intrusion efficiency varies significantly among different cases.
OBJECTIVE: To analyze and compare the intrusion efficiency of the anterior teeth with clear aligners by the indirect model superimposition method based on the occlusal records.
METHODS: Forty-three patients with anterior deep overbite were selected as the subjects of this study and divided into the non-extraction and extraction groups. The non-extraction group was then divided into the alignment and maxillary molar distalization subgroups. The extraction group was subdivided into the first premolar extraction and second premolar extraction subgroups. In the Geomagic 2014 software, the occlusal plane inclinations of the pre- and post-treatment models were calibrated based on the angle between the Frankfort plane and occlusal plane. The maxillary and mandibular models were superimposed by the maxillary palatine folds and occlusal records. Based on the Frankfort plane, the measurement coordinate system was established to measure the actual intrusion amount. The relative intrusion amount in the ClinCheck protocol was recorded as the designed intrusion amount.
RESULTS AND CONCLUSION: (1) The actual intrusion amount of the anterior teeth was significantly less than the designed intrusion amount in the non-extraction and extraction groups (P < 0.01). Overcorrection should be designed in the anterior intrusion using clear aligners. (2) The intrusion efficiency in the non-extraction group (50.69%) was significantly higher than that in the extraction group (39.73%) (P < 0.01). More overcorrection was required in the extraction cases. (3) The intrusion efficiency of the mandibular anterior teeth was significantly higher than that of the maxillary anterior teeth (P < 0.01). More overcorrection was required in the intrusion of maxillary anterior teeth. (4) There was no significant difference in the intrusion efficiency between the alignment subgroup and maxillary molar distalization subgroup (P > 0.05). (5) The intrusion efficiency of the second premolar extraction subgroup was significantly higher than that of the first premolar extraction subgroup (P < 0.01). Extracting the second premolars was more beneficial for the vertical control of the anterior teeth than extracting the first premolars. (6) There was a linear relationship between the designed and actual intrusion amount between the groups. The regression equation could provide reference for the clinicians to design personalized overcorrection amount based on different teeth and treatment protocols.

Key words: clear aligner, deep overbite, anterior intrusion, extraction treatment, molar distalization, overcorrection

CLC Number:

Wang Shiyu, Huang Yangyang, Liu Hao, Xu Jiabin, Wang Penglai, Yang Li. Efficiency of anterior tooth intrusion in deep overbite cases with clear aligners: analysis via the indirect model superimposition method[J]. Chinese Journal of Tissue Engineering Research, 2026, 30(25): 6489-6495.

Figures/Tables 8

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