Chinese Journal of Tissue Engineering Research ›› 2011, Vol. 15 ›› Issue (22): 4069-4072.doi: 10.3969/j.issn.1673-8225.2011.22.019

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Bivariate evaluation of the short implant diameter and length in type Ⅱ jaw bone of maxillary sinus area

Wang Han1, Li De-chao1, Zhu Yang1, Zhang Lin-lin2, Li He-jia3   

  1. 1Department of Oral Implant, Stomatology Hospital of Jiamusi University, Jiamusi  154002, Heilongjiang Province, China
    2Department of Peridontology and Oral Mucosa, Stomatology Hospital of Shuangyashan, Shuangyashan  155100, Heilongjiang Province, China
    3Department of Prosthodontics, Stomatology Hospital of Jiamusi University, Jiamusi  154002, Heilongjiang Province, China
  • Received:2011-02-06 Revised:2011-04-13 Online:2011-05-28 Published:2011-05-28
  • Contact: Li De-chao, Doctor, Associate chief physician, Department of Oral Implant, Stomatology Hospital of Jiamusi University, Jiamusi 154002, Heilongjiang Province, China dechaoli2004@yahoo.com.cn
  • About author:Wang Han★, Studying for master’s degree, Department of Oral Implant, Stomatology Hospital of Jiamusi University, Jiamusi 154002, Heilongjiang Province, China wanghan2001_82@163.com
  • Supported by:

    Science and Technology Plan of Heilongjiang Health Bureau, No. 2009-366*; Science and Technology Research Program of Jiamusi University, No. Sz 2009-001*

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Abstract:

BACKGROUND: What changes occur in the biomechanical indexes of maxillary sinus area following short implant implantation?
OBJECTIVE: To research the best range of length and diameter when applying the short implants at the vertical bone height in maxillary sinus of 9 mm, providing the theoretical basis for the clinical application of short implant.
METHODS: The establishment of parameterization included the three-dimension finite element model of type Ⅱ bone of the upper jaw sinus area of short implant. The diameter of the short implants was 4-6 mm and the length was 6-8 mm. The maximum equivalent stresses of diameter and length for the jaw were analyzed.
RESULTS AND CONCLUSION: Under vertical (buccal-lingual) loading condition, the amplification of maximum equivalent stresses in cortical bone and cancellous bone were 26% (40%) and 31% (45%) respectively with the diameter increasing; The amplification of maximum equivalent stresses in cortical bone and cancellous bone were 8% (5%) and 0 (7%) respectively with the length increasing. When diameter exceeded 4.8 mm and length exceeded 7.5 mm, the response curve curvatures of maximum equivalent stresses to diameter and length in jaw bone ranged from -1 to 0. And the variation of the maximum equivalent stresses in jaw bone was more sensitive to diameter than to length. The increasing for the diameter and length of short implants could reduce the stress of jaw bone. Especially the increasing of diameter are could improve distribution of mechanics better. From the biomechanics angle, when vertical bone height in maxillary sinus of 9 mm short implant, the diameter should be > 4.8 mm, the length should be > 7.5 mm, to ensure its stability.

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