Biocompatibility of polymethylmethacrylate as a polymer material for dental implants

doi:10.3969/j.issn.2095-4344.2015.47.012

Abstract

Abstract:

BACKGROUND: As a kind of dental implant material, the application of titanium has certain restrictions because of its higher probability of postoperative bleeding rate, infection and gingival hyperplasia. Studies have shown that polymethylmethacrylate has been used in artificial joints and artificial bones, but rarely reported to be used as dental implant material.
OBJECTIVE: To explore the biocompatibility indexes such as cytotoxicity, cell adhesion rate, relative cell proliferation rate and post-implantation inflammatory response of human osteoblasts when pure titanium and polymethylmethacrylate are used as dental implant materials, so as to provide certain reference basis for the clinical usage of polymethylmethacrylate as the dental implant material.
METHODS: Human osteoblasts were cultured in vitro. Three groups were divided as follows: control group
(cells cultured normally), pure titanium group (cells cultured with titanium extract) and polymethylmethacrylate group (cells cultured with polymethylmethacrylate extract).
RESULTS AND CONCLUSION: Compared with the control group, the cell adhesion rate was significantly decreased after 2, 4, 8 and 16 hours of culture with pure titanium and polymethylmethacrylate extracts (P < 0.05); the cell adhesion rate in the polymethylmethacrylate group was higher than that in the pure titanium group (P < 0.05). Compared with the control group, the cells were sparse and grew slowly after 2 days of culture with pure titanium and polymethylmethacrylate extracts. Cells in the polymethylmethacrylate group grew faster with fusiform distribution and obvious drawing phenomenon. Compared with the control group, the relative cell proliferation rate was significantly decreased after 2 days of culture with pure titanium and polymethylmethacrylate extracts (P < 0.05); the relative cell proliferation rate of polymethylmethacrylate group was higher than that of the pure titanium group (P < 0.05). The expression of inflammatory factors in rat serum was significantly increased after 7 days of implantation of titanium and polymethylmethacrylate materials (P < 0.05), the expression of inflammatory factors in the polymethylmethacrylate group was less than that in the titanium group (P < 0.05). There was only one rat developing allergic reaction, but no pyrogen reaction and no death in the polymethylmethacrylate group; and three rats presented with allergic reaction, one rat present with pyrogen reaction and no death occurred in the pure titanium group. These results demonstrate that as the dental implant material, polymethylmethacrylate is superior to pure titanium in the cell toxicity, inflammatory response and biocompatibility.
中国组织工程研究杂志出版内容重点：生物材料；骨生物材料; 口腔生物材料; 纳米材料; 缓释材料; 材料相容性；组织工程

Key words: Tissue Engineering, Biocompatible Materials, Titanium

Li Xiao-dong, Li Xin-mei, Sun Xiao-chen, Sun Xiang. Biocompatibility of polymethylmethacrylate as a polymer material for dental implants[J]. Chinese Journal of Tissue Engineering Research, 2015, 19(47): 7613-7618.

Figures/Tables 5

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