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KMID : 1025720140330020048
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Journal of Dental Implant Research
2014 Volume.33 No. 2 p.48 ~ p.52
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The influence of the cancellous bone thickness and density on the implant primary stability
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Hong Seung-Beom
Kim Min-Suk
Jeon Tea-Hyun
Kim Young-Kak
Hyun Ki
Zhou Cong
Choi Yeon-Jo
Jun Sang-Ho
Ryu Jae-Jun
Kwon Jong-Jin
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Abstract
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Purpose: The purpose of this study was to evaluate the influence of the cancellous bone thickness and density on the implant primary stability.
Materials and Methods: The implants used in this experiment were Biotem implants, designed internal submerged tapered (Ø 4.0 mm × 11.5 mm, RBM surface, Seoul, Korea). A total of the 108 Biotem implants were installed into 18 artificial block bone blocks (Sawbones, Pacific Research Laboratories, Washington, USA). The artificial bone blocks were divided depending on density (D3, D4 bone) and each group was divided again into 3 groups according to cortical bone thickness (0 mm, 1 mm, 2 mm). The cancellous bone part of artificial bone blocks were removed leaving 2 mm, 5 mm, 8 mm bone thickness. Then, we inserted the implants on the artificial bone blocks. For each bone block, 6 installation sites were prepared. After inserting the implants, we measured the ISQ (Implant Stability Quotient) value with Osstell Mentor. Finally, the 2 way ANOVA was undertaken for statistical analysis (P＜0.05).
Results: We compared the ISQ values with different density and thickness of cancellous bones. The stabilities on D3 and D4 bones show a statistically significant difference in ISQ values . The thickness of the cancellous bone on D3 showed a statistically significant difference when the thickness of the cortical bone was zero and 1mm. However, the thickness of the cancellous bone on D3 did not show a statistically significant difference when the thickness of the cortical bone was 2 mm. The thickness of the cancellous bone on D4 showed a statistically significant difference when the thickness of the cortical bone was zero. However, the thickness of the cancellous bone on D4 did not show a statistically significant ifference when the thickness of cortical bone was 1mm and 2 mm. The influence of cancellous bone was greater when the quality of bone was greater and the thickness of cortical bone was thinner.
Conclusion: There was a statistically significant difference of the primary stability due to cancellous bone density of D3 and D4 bone. However, there was no statistical significance in the primary stability when cortical thickness was 2mm regardless the thickness of the cancellous bone. The influence of cancellous bone was greater when the quality of bone was greater and the thickness of cortical bone was thinner.
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KEYWORD
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primary stability, cortical bone, cancellous bone thickness and density, ISQ value
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