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Journal of Peking University (Health Sciences) ›› 2021, Vol. 53 ›› Issue (2): 378-383. doi: 10.19723/j.issn.1671-167X.2021.02.024

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In vivo study of strontium-doped calcium phosphate cement for biological properties

WANG Jing-qi1,2,WANG Xiao1,Δ()   

  1. 1. Department of Stomatology, Peking University Third Hospital, Beijing 100191, China
    2. Department of Stomatology, the Second Affiliated Hospital of Hainan Medical University, Haikou 570311, China
  • Received:2019-07-09 Online:2021-04-18 Published:2021-04-21
  • Contact: Xiao WANG E-mail:bysywangxiao@163.com
  • Supported by:
    Discipline Construction Fund of Beijing Stomotology Hospital(15-09-03)

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Abstract:

Objective: To evaluate the biocompatibility and osteogenic effect of new calcium phosphate cement (CPC) in vivo and to provide experimental basis for its further clinical application. Methods: Thirty New Zealand white rabbits were randomly divided into four groups: CPC group, CPC+Bio-Oss group, Bio-Oss group and blank control group. Bone defect models of 6 mm in diameter and 7 mm in depth were made on the lateral condyle of bilateral hind legs of the rabbits. CPC, Bio-Oss and CPC+Bio-Oss mixture were implanted into the bone defect according to the group, and the mass ratio of CPC and Bio-Oss was 4 ∶1. The experimental animals were sacrificed the 4th, 12th and 24th week after operation. The tissue around the bone defect was taken for histological evaluation by H&E staining. Bone ingrowth fraction (BIF) was calculated. The expression of BMP-2 and COL-Ⅰ was detected by immunohis-tochemical staining by calculating the mean optical density (MOD) of the positive area the 4th week after operation, and the bone healing of each group was evaluated at different time points. The measurement data were analyzed by one-way ANOVA and LSD test was used for multiple comparison of the differences between the means by SPSS 19.0. P<0.05 was considered to be statistically significant. Results: The results of H&E staining showed that the BIF values of CPC group, CPC + Bio-Oss group and Bio-Oss group were significantly higher than those of blank control group at the same time point (P<0.01). The BIF values of CPC group were lower than those of Bio-Oss group and CPC + Bio-Oss group (P<0.01). There was no significant difference between CPC + Bio-Oss group and Bio-Oss group. Immunohistochemical staining showed that the MOD values of BMP-2 and COL-Ⅰ in CPC group were higher than those in blank control group, but lower than those in Bio-Oss group and CPC+Bio-Oss group (P<0.01). There was no significant difference between BMP-2 and COL-Ⅰ in CPC+Bio-Oss group and Bio-Oss group. Conclusion: The new calcium phosphate cement has good biocompatibility and can promote early osteogenesis with stable and long-term effect.

Key words: Calcium phosphate cement, Biocompatibility, Bone defect, Osteogenesis

CLC Number: 

  • R783.1

Figure 1

Histological sections at different time points of each group bone ingrowth fraction(×12.5,×200)"

Figure 2

Bone ingrowth fraction (BIF) at different time points of each group *P<0.01."

Figure 3

BMP-2 and COL-Ⅰ immunohistochemical staining of histological sections and at 4th week A, immunohistochemical staining of each group at 4th week(×40,×200); B, MOD of BMP-2 in each group; C. MOD of COL-Ⅰ in each group. *P<0.01."

Table 1

MOD of BMP-2 and col-Ⅰ immunohistochemical staining of histological sections at the 4th week ($\bar{x} \pm s$)"

Group BMP-2 COL-Ⅰ
Blank 0.496±0.016 0.121±0.026
CPC 0.134±0.021* 0.244±0.023*
Bio-Oss 0.208±0.020* 0.315±0.025*
CPC+Bio-Oss 0.197±0.022* 0.302±0.019*
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