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Is miniscrew primary stability influenced by bone density?
Mariana Marquezan1, Margareth Maria Gomes de Souza, Mônica Tirre de Souza Araújo
1Pedodontics and Orthodontics Department, Federal University of Rio de Janeiro, Rio de Janeiro, RJ, Brazil.
Brazilian Oral Research
|October 28, 2011
Summary
This study found that while bovine iliac and pubic bones have different bone densities, miniscrew primary stability is unaffected by these variations. Cortical thickness of 1 mm is key for consistent implant stability.
Area of Science:
- Biomaterials Science
- Orthodontics
- Dental Implantology
Background:
- Primary stability of mini-implants is crucial for successful osseointegration.
- Bone quality, often equated with bone density, influences primary stability.
- Bovine pelvic bone is a potential model for studying bone quality and implant stability.
Purpose of the Study:
- To compare bone density in bovine iliac and pubic bones.
- To evaluate the primary stability of miniscrews inserted into these regions.
- To determine the relationship between bone density and miniscrew primary stability.
Main Methods:
- Forty bovine pelvic bone blocks (20 iliac, 20 pubic) with 1 mm cortical bone were used.
- Bone density assessed via histology (trabecular bone area - TBA) and DEXA (bone mineral density - BMD).
- Miniscrew primary stability measured by insertion torque (IT) and pull-out strength (PS).
Main Results:
- Iliac bone showed lower BMD and TBA values compared to pubic bone (P > 0.05).
- Miniscrew primary stability (IT and PS) did not differ significantly between iliac and pubic bone (P < 0.05).
- Bone density variations did not influence primary stability when cortical thickness was approximately 1 mm.
Conclusions:
- Bovine iliac and pubic bones exhibit distinct bone densities.
- Miniscrew primary stability is not significantly affected by these bone density differences in the tested bovine pelvic regions with 1 mm cortical bone.
- Cortical thickness appears to be a critical factor for achieving consistent miniscrew primary stability.
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