Repairing a bone defect model by using autogenous bone powder and implant materials

Yi WANG; Guowu MA

ABSTRACT

BACKGROUND:

Sampling the autogenous bone always needs to develop the second operational area or harvest surrounding the implant, which will increase the risk of trauma and infection. Therefore autogenous bone powder may be taken into consideration to reclaim and use for the treatment of local bone defect.

OBJECTIVE:

To construct experimental models of repairing bone defect by autogenous bone powder and implant material, and observe the biocompatibility between materials and host.

DESIGN:

Single sample observation.

SETTING:

College of Stomatology, Dalian Medical University.MATERIALS The experiment was performed at the Animal Experimental Center of Dalian Medical University from August 2005 to April 2006. Five healthy hybrid dogs were used in this study. Titanium nail and Bio-Oss bone implant materials were designed and produced by Xi'an Zhonghang Titanium Biological Materials Co., Ltd.

METHODS:

The first, second and third premolars of dogs were uprooted and received implantation 3 months later. Four implant sockets were prepared at left and right sides respectively of each dog, totally 40 sockets. One titanium nail was implanted into each socket, totally 40 nails. Autogenous bone powder collected when drilling hole, Bio-Oss implant materials and their mixture at 11 were implanted in artificial bone defect at bucca side, respectively, while non-implanted bone was served as blank control.MAIN OUTCOME

MEASURES:

①At week 9, recovery of bone mass was recorded. Height of alveolar bone, density of bone trabecula and osseointegration were observed by X-ray film.②Histological change was determined by methylene blue-basic fuchsin method.

RESULTS:

No titanium nail fell off, so five dogs were all involved in the result analysis.①General condition and bone defect At week 9 of implantation, wound was well healed, and the titanium nail was stable with total reserved rate of 100%. Compared with blank control, the bone defect mass was less in bones implanted with autogenous bone powder (P＜0.01), and the least in bones implanted with mixed powder, which had optimal recovery.②Recovery of bone mass X-ray film demonstrated that, 40 titanium nails were closely connected with bone, and the healing was well.③Biocompatibility between materials and host All titanium nails were closely surrounded by erythroic compact bone, no blue soft tissues were seen between implant materials and bone, and direct bone interface appeared under low power lens.

CONCLUSION:

It is effective to repair bone defect by autogenous bone powder and implant material in dog models,good hiocompatibility is observed between materials and host.