Journal of Periodontal and Implant Science

Korean Academy of Periodontology (대한치주과학회)
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Guided bone regeneration of calcium phosphate-coated and strontium ranelate-doped titanium mesh in a rat calvarial defect model

  • Seon Mi Byeon (Department of Dental Biomaterials, Institute of Biodegradable Materials, School of Dentistry, Jeonbuk National University) ;
  • Tae Sung Bae (Department of Dental Biomaterials, Institute of Biodegradable Materials, School of Dentistry, Jeonbuk National University) ;
  • Min Ho Lee (Department of Dental Biomaterials, Institute of Biodegradable Materials, School of Dentistry, Jeonbuk National University) ;
  • Seung Geun Ahn (Department of Prosthodontics, School of Dentistry, Jeonbuk National University)
  • Received : 2023.06.19
  • Accepted : 2023.11.29
  • Published : 2024.10.30
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Abstract

Purpose: When applied alone, titanium (Ti) mesh may not effectively block the penetration of soft tissues, resulting in insufficient new bone formation. This study aimed to confer bioactivity and improve bone regeneration by doping calcium phosphate (CaP) precipitation and strontium (Sr) ranelate onto a TiO2 nanotube (TNT) layer on the surface of a Ti mesh. Methods: The TNT layer was obtained by anodizing on the Ti mesh, and CaP was formed by cyclic pre-calcification. The final specimens were produced by doping with Sr ranelate. The surface properties of the modified Ti mesh were investigated using high-resolution field emission scanning electron microscopy, energy-dispersive X-ray spectroscopy, and X-ray diffraction. To evaluate the effects of surface treatment on cell viability, osteoblasts were cultured for 1-3 days, and their absorbance was subsequently measured. In an in vivo experiment, critical-size defects were created in rat calvaria (𝚽=8 mm). After 5 weeks, the rats were sacrificed (n=4 per group) and bone blocks were taken for micro-computed tomography and histological analysis. Results: After immersing the Sr ranelate-doped Ti mesh in simulated body fluid, the protrusions observed in the initial stage of hydroxyapatite were precipitated as a dense structure. On day 3 of osteoblast culture, cell viability was significantly higher on the precalcified Sr ranelate-doped Ti mesh surface than on the untreated Ti mesh surface (P<0.05). In the in vivo experiment, a bony bridge formed between the surrounding basal bone and the new bone under the Sr ranelate-doped Ti mesh implanted in a rat calvarial defect, closing the defect. New bone mineral density (0.91±0.003 g/mm3) and bone volume (29.35±2.082 mm3) significantly increased compared to the other groups (P<0.05). Conclusions: Cyclic pre-calcification of a Ti mesh with a uniform TNT layer increased bioactivity, and subsequent doping with Sr ranelate effectively improved bone regeneration in bone defects.

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