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A rat model for microimplant-assisted rapid palatal expansion
Yu Jin1, Xuechun Yuan2, Haoxin Zhang2
1Department of Orthodontics, State Key Laboratory of Oral Diseases, National Clinical Research Center for Oral Diseases, National Center for Stomatology, West China Hospital of Stomatology, Sichuan University, Chengdu, Sichuan, China; Chengdu First People's Hospital, Chengdu, Sichuan, China.
Researchers developed a new rat model for microimplant-assisted rapid palatal expansion (MARPE) to study maxillary transverse deficiency. This validated MARPE model demonstrates effective bone remodeling and offers a valuable tool for future research.
Area of Science:
- Orthodontics and Dental Research
- Skeletal Biology
- Biomaterials Science
Background:
- Microimplant-assisted rapid palatal expansion (MARPE) is crucial for correcting maxillary transverse deficiency.
- Existing research lacks small-animal models for MARPE, hindering biological mechanism studies.
- This study addresses the need for a MARPE rat model to investigate bone remodeling.
Purpose of the Study:
- To establish and validate a novel MARPE rat model.
- To investigate the bone remodeling mechanisms during palatal expansion.
- To compare the orthopedic efficiency and side effects of MARPE versus conventional tooth-borne rapid maxillary expansion (RME).
Main Methods:
- Development of a MARPE rat model using mini-screws and a spring.
- Validation of the model through micro-computed tomography (micro-CT) and histological analyses.
- Screening for optimal expanding force (100g) and assessment of radiological and histological changes at different time points.
Main Results:
- Successful midpalatal suture separation confirmed by micro-CT.
- MARPE group showed increased suture and palatal bone width with reduced molar inclination compared to RME.
- Histology revealed active bone formation, cell proliferation, and differentiation, with increased osteogenic marker expression.
Conclusions:
- A standardized and validated MARPE rat model has been successfully developed.
- The MARPE model exhibits superior orthopedic efficiency and fewer side effects than conventional RME.
- This novel model provides a valuable platform for future research into MARPE and maxillary skeletal expansion.
