Smile Aesthetic Outcomes of Infrazygomatic Crest Miniscrews in Patients with Skeletal Class Ⅱ Malocclusions

doi:10.13701/j.cnki.kqyxyj.2024.11.005

Abstract

Abstract: Objective: To explore the smile aesthetic outcomes of infrazygomatic crest miniscrews in patients with skeletal Class Ⅱ malocclusions. Methods: One hundred and three patients with skeletal Class Ⅱ malocclusions admitted to our hospital from January 2017 to January 2021 were selected and assigned into two groups according to the orthodontic treatment plans. Study group (n=52) received infrazygomatic crest miniscrews plus straight-wire appliance, while control group (n=51) was given facebow headgear plus straight-wire appliance. The overall therapeutic efficacy, treatment duration, cephalometric indices six months post-treatment, smile aesthetic effects, and complication rates were compared between the two groups. Results: There was no difference in the success rate of treatment between the two groups (P>0.05),and the treatment time of the study group (14.3±3.6) was lower than that of the control group (20.1±4.2) (P<0.05). There was a notable improvement in the angle formed between the long axis of upper central incisor and the lower central incisor (U1-L1), angle formed between the long axis of lower central incisor and the mandibular plane (L1-MP), angle between the long axis of the upper central incisor and the plane of the anterior skull base (U1-SN), point A-Nasion-point B (ANB) angle, maxillary central incisor adduction (U1-Ptm), maxillary molar distal movement (U6-SP), overjet (OJ), and overbite (OB) in both group after treatment. The amount of change in U6-SP was smaller and the amount of change in U1-L1, U1-SN, U1-Ptm and L1-MP was larger in study group than that in control group before and after orthodontic treatment (P<0.05). There was no statistical difference between two groups in the comparison of the complications such as root resorption, maxillary sinus floor infection, traumatic ulceration, and peri-implantitis (P>0.05). Conclusion: Application of infrazygomatic crest miniscrews in patients with skeletal Class Ⅱ malocclusions can effectively shorten the orthodontic time, improve the maxillary retraction of anterior teeth, and ameliorate the smile aesthetics.

Key words: infrazygomatic crest, miniscrews, skeletal Class Ⅱ malocclusions, smile aesthetics

ZHAO Jian, SHI Shuya, LI Chaoqun, LI Xin, HOU Deqiang. Smile Aesthetic Outcomes of Infrazygomatic Crest Miniscrews in Patients with Skeletal Class Ⅱ Malocclusions[J]. Journal of Oral Science Research, 2024, 40(11): 967-971.

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