Limitation of the antibiotic-eluting bone graft substitute: An example of gentamycin-impregnated calcium sulfate

Chang Chin Wu, Yang Kai Huang, Wei Jen Chang, Yun Ching Wu, Chen Chie Wang, Kai Chiang Yang

Research output: Contribution to journalArticlepeer-review

8 Citations (Scopus)


Patients with inadequate volume of alveolar processes or bone defects commonly require graft substitutes in oral, maxillofacial or orthopedic surgery. Ridge augmentation and reconstruction of facial bony defects with bone graft materials achieve better outcomes in functional and aesthetic rehabilitation. The injectable calcium sulfate filler is used widely in intra-operative applications. Calcium sulfate bone filler has been shown to upregulate bone formation-related mRNA genes in vitro and improve osseointegration in vivo. In addition, the bone graft substitute can be used as a drug delivery system for antibiotics to treat or prevent infections based on the clinical experiences. However, the influences of antibiotics addition on the calcium sulfate are not fully understood. In this study, calcium sulfate impregnated with gentamycin in different weight ratios was characterized. The results showed that gentamycin prolonged the hydration process and extended initial/final setting times of calcium sulfate. The addition of gentamycin slowed the conversion from calcium sulfate hemihydrate to dihydrate and changed the crystalline phase and microstructure. Higher amounts of gentamycin added resulted in faster degradation and lower mechanical strength of calcium sulfate. This study reveals that the extended setting time, decreased compressive strength, and the accelerated degradation of the gentamycin-impregnated calcium sulfate bone graft substitutes should be considered during intra-operative applications.

Original languageEnglish
Pages (from-to)80-87
Number of pages8
JournalJournal of Biomedical Materials Research - Part B Applied Biomaterials
Issue number1
Publication statusPublished - 2018
Externally publishedYes


  • Bone defect
  • Bone substitute
  • Calcium sulfate
  • Gentamycin
  • Infection

ASJC Scopus subject areas

  • Biomaterials
  • Biomedical Engineering


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