Related Experiment Video
Updated: Jun 14, 2026
Measuring Maxillary Posterior Tooth Movement: A Model Assessment using Palatal and Dental Superimposition
Published on: February 23, 2024
[Comparison of the effects resulted by modified maxillary oblique plate and Twin-block in advancing mandible]
Lei-ying Zhang1, Dong-mei Sun, Gang Shen
1Department of Orthodontics, Ninth People's Hospital, College of Stomatology, Shanghai Jiao Tong University School of Medicine, Shanghai Key Laboratory of Stomatology. Shanghai 200011. Leiying_zhang@hotmail.com
Unlabelled:
URPOSE: The aim of this study was to evaluate the effects resulted by modified maxillary oblique plate in advancing mandible.
Methods:
Twelve Class II division II cases (4 males, 8 females) with mandibular retrusion were selected as group 1 aligned by fixed appliances in the upper arches, and their mandibles were advanced by the modified maxillary oblique plates. Meanwhile, twelve Class II division II cases (5 males, 7 females) with mandibular retrusion were selected as group 2 treated with the Twin-block. The average age was 11 years 8 months in group 1, and 11 years 6 months in group 2. The effects of advancing mandible were compared between the two groups by analyzing cephalometric films before and after treatment with SAS6.0 software package.
Results:
Mandibular advancement was achieved in the two groups. Mandibular anterior teeth labial tipping was more obvious in group 1 than in group 2, but without significant those(P>0.05). Both mesial and occlusal movements of the lower first molar in group 2 were more significant than those in group 1 (P<0.05).
Conclusions:
Based on the results, the modified maxillary oblique plate is an excellent appliance for the advancing mandible in Class II division II cases with the advantages of economics, simplification and effectiveness.
