Chinese Journal of Tissue Engineering Research ›› 2010, Vol. 14 ›› Issue (24): 4458-4461.doi: 10.3969/j.issn.1673-8225.2010.24.020

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Differences of surface morphology, element content and micro-hardness between dentinogenesis imperfecta and normal permanent dentin

Xi Ge1, Zhang Dong1, Meng Yong-jie2, Wang Jian-rong1, Liu Bin1   

  1. 1 Department of Prosthodontics, College of Stomatology, Lanzhou University, Lanzhou  730000, Gansu Province, China; 2 Department of Quality Control, People’s Hospital of Gansu Province, Lanzhou  730000, Gansu Province, China
  • Online:2010-06-11 Published:2010-06-11
  • Contact: Liu Bin, Doctor, Professor, Department of Prosthodontics, College of Stomatology, Lanzhou University, Lanzhou 730000, Gansu Province, China liubkq@lzu.edu.cn
  • About author:Xi Ge, Experimentalist, Department of Prosthodontics, College of Stomatology, Lanzhou University, Lanzhou 730000, Gansu Province, China Xige@lzu.edu.cn
  • Supported by:

    the Plan of Lanzhou Science and Technology Bureau, No. 2008-1-86*; Open Item of State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, No. 0808*; Undergraduate Innovative Test Program, Ministry of Education, No. LZUYX200625*

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Abstract:

BACKGROUND: At present, the study of dentinogenesis imperfecta focuses on familial and phenotypic analysis, but the reports about physical properties of dentinogenesis imperfecta dentin are few.
OBJECTIVE: To comparative the differences of surface morphology, element content and micro-hardness of dentinogenesis imperfecta and permanent dentin.
METHODS: Totally 5 dentinogenesis imperfecta teeth were collected from 3 patients. At the same time, orthodontic teeth served as controls. The surface morphology, element content and micro-hardness of dentinogenesis imperfecta dentin and permanent dentin were measured by scanning electron microscope, X-ray energy chromatography and nano-indentation instrument.
RESULTS AND CONCLUSION: The dentin structure of dentinogenesis imperfecta was loose, and the dentinal tubule structural was affected. The content of Na, Zn, S, Ca in dentinogenesis imperfecta was significantly greater than that of permanent dentin, but the content of Mg, P, Cl was significantly decreased than permanent dentin (P < 0. 01). The Ca/P ratio of dentinogenesis imperfecta was 1.76, which significantly higher than permanent dentin (P < 0.01). Microhardness test results showed micro-hardness of dentinogenesis imperfect was (1.18±0.18) GPa, which was significantly lower than that of normal permanent dentin (1.72±0.48) GPa (P < 0. 01). The dentinal tubule structural of dentinogenesis imperfecta was changed, and micro-hardness was reduced, all these may be related to the element content.

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