Related Experiment Video
Updated: Jul 14, 2026
Measuring Maxillary Posterior Tooth Movement: A Model Assessment using Palatal and Dental Superimposition
Published on: February 23, 2024
[Preliminary clinical study on intrusion of overerupted molars with a removable appliance]
Yi-ming Yang1, Si-en Weng, Lin-ling Chen
1Department of Orthodontics, College of Stomatology, Ninth People's Hospital, School of Medicine, Shanghai Jiao Tong University, Shanghai 200011, China. sherrya@citiz.net
Purpose:
To evaluate the clinical effect of molar intrusion with a removable appliance and determine its clinical value.
Methods:
Seven patients were selected in the study.The clinical effect of intrusion was evaluated,the periodontal attachments and root resorption post-treatment were accessed by models,clinical examination, periapical radiograph analysis via CygnusRay2TM digital X-ray system pre and post-treatment.The data was analyzed using SAS6.12 software package.
Results:
All the overerupted molars had been intruded successfully within an average time of 3.7 months.Pre and post-treatment model analysis demonstrated the maximum intrusion amount was 3.05mm,minimum 1.03mm and mean 0.58mm per month.Analysis of pre and post-treatment periapical radiographs and periodontal probing depth showed no significant difference in probing depth,distance from cemento-enamel junction to alveolar bone crest,mesial and distal tooth length between pre- and post- treatment (P>0.05).
Conclusions:
Molar intrusion with the removable appliance has a significant effect without apparent destruction of the periodontal tissue and root resorption.
