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Bone-borne accelerated sutural expansion: A microcomputed tomography study in rabbits
Akram S Alyessary1, Adrian U J Yap2, Siti A Othman3
1Department of Paediatric Dentistry and Orthodontics, Faculty of Dentistry, University of Malaya, Kuala Lumpur, Malaysia; Department of Orthodontics, College of Dentistry, Kerbala University, Kerbala, Iraq.
Summary
Accelerated sutural expansion protocols were tested in rabbits. A 2.5 mm instant expansion followed by 0.5 mm/day for 7 days appears optimal for sutural separation and bone modeling.
Area of Science:
- Orthodontics
- Craniofacial Biology
- Biomaterials
Background:
- Bone-borne accelerated expansion protocols are increasingly used in orthodontics.
- Understanding their effects on sutural separation and bone modeling is crucial for optimizing treatment outcomes.
- Microcomputed tomography (micro-CT) offers a non-invasive method for evaluating these changes.
Purpose of the Study:
- To evaluate the impact of varying bone-borne accelerated expansion protocols on sutural separation and bone modeling.
- To determine the optimal instant sutural expansion that promotes separation without compromising bone modeling.
Main Methods:
- Sixteen rabbits underwent modified hyrax expander placement across interfrontal sutures.
- Four groups received different instant expansion protocols (0.5-4 mm) followed by daily expansion.
- Sutural separation and bone modeling were assessed using micro-CT after 6 weeks of retention.
Main Results:
- Sutural separation increased with higher instant expansion amounts, ranging from 2.84 to 4.41 mm.
- Bone volume fraction varied, with the 2.5 mm instant expansion group showing the highest percentage (69.15%).
- A strong positive correlation (r=0.970) was found between instant expansion and sutural separation.
Conclusions:
- The protocol of 2.5 mm instant expansion followed by 0.5 mm/day for 7 days is suggested as optimal for accelerated sutural expansion.
- Higher instant expansion (4 mm) led to a decrease in sutural bone volume fraction, indicating potential disruption of bone modeling.
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