title: Acid-resistant calcium silicate-based composite implants with high-strength as load-bearing bone graft substitutes and fracture fixation devices.
abstract: To achieve the excellent mechanical properties of biodegradable materials used for cortical bone graft substitutes and fracture fixation devices remains a challenge. To this end, the biomimetic calcium silicate/gelatin/chitosan oligosaccharide composite implants were developed, with an aim of achieving high strength, controlled degradation, and superior osteogenic activity. The work focused on the effect of gelatin on mechanical properties of the composites under four different kinds of mechanical stresses including compression, tensile, bending, and impact. The evaluation of in vitro degradability and fatigue at two simulated body fluid (SBF) of pH 7.4 and 5.0 was also performed, in which the pH 5.0 condition simulated clinical conditions caused by bacterial induced local metabolic acidosis or tissue inflammation. In addition, human mesenchymal stem cells (hMSCs) were sued to examine osteogenic activity. Experimental results showed that the appropriate amount of gelatin positively contributed to failure enhancement in compressive and impact modes. The 10wt% gelatin-containing composite exhibits the maximum value of the compressive strength (166.1MPa), which is within the reported compressive strength for cortical bone. The stability of the bone implants was apparently affected by the in vitro fatigue, but not by the initial pH environments (7.4 or 5.0). The gelatin not only greatly enhanced the degradation of the composite when soaked in the dynamic SBF solution, but effectively promoted attachment, proliferation, differentiation, and formation of mineralization of hMSCs. The 10wt%-gelatin composite with high initial strength may be a potential implant candidate for cortical bone repair and fracture fixation applications.
authors.affiliation: Institute of Oral Science, Chung Shan Medical University, Taichung City 402, Taiwan.
authors.forename: Chung-Kai
authors.initials: CK
authors.lastname: Wei
authors.affiliation: Institute of Oral Science, Chung Shan Medical University, Taichung City 402, Taiwan; Department of Dentistry, Chung Shan Medical University Hospital, Taichung City 402, Taiwan. Electronic address: sjding@csmu.edu.tw.
authors.forename: Shinn-Jyh
authors.initials: SJ
authors.lastname: Ding
mesh_terms: D001696:Biomechanical Phenomena; D018786:Bone Substitutes; D002118:Calcium; D017610:Calcium Compounds / Q000737:chemistry*; D002478:Cells, Cultured; D048271:Chitosan / Q000737:chemistry; D005592:Fracture Fixation / Q000295:instrumentation*; D005780:Gelatin / Q000737:chemistry; D006801:Humans; D008422:Materials Testing; D059630:Mesenchymal Stem Cells / Q000166:cytology; D017640:Silicates / Q000737:chemistry*; D016474:Weight-Bearing
chemical_list: D018786:Bone Substitutes; D017610:Calcium Compounds; D017640:Silicates; D005780:Gelatin; D048271:Chitosan; C031293:calcium silicate; D002118:Calcium
keywords: Bone substitute; Calcium silicate; Fracture fixation; Gelatin; In vitro degradation; Mechanical properties