Journal of Periodontal and Implant Science

Korean Academy of Periodontology (대한치주과학회)
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Primary implant stability in a bone model simulating clinical situations for the posterior maxilla: an in vitro study

  • Han, Ho-Chyul (Department of Periodontology, Kyung Hee University School of Dentistry) ;
  • Lim, Hyun-Chang (Department of Periodontology, Kyung Hee University School of Dentistry) ;
  • Hong, Ji-Youn (Department of Periodontology, Kyung Hee University School of Dentistry) ;
  • Ahn, Su-Jin (Department of Biomaterials & Prosthodontics, Institute of Oral Biology, Kyung Hee University School of Dentistry) ;
  • Han, Ji-Young (Department of Dentistry & Periodontology, Hanyang University College of Medicine) ;
  • Shin, Seung-Il (Department of Periodontology, Kyung Hee University School of Dentistry) ;
  • Chung, Jong-Hyuk (Department of Periodontology, Kyung Hee University School of Dentistry) ;
  • Herr, Yeek (Department of Periodontology, Kyung Hee University School of Dentistry) ;
  • Shin, Seung-Yun (Department of Periodontology, Kyung Hee University School of Dentistry)
  • Received : 2016.04.24
  • Accepted : 2016.07.05
  • Published : 2016.08.30
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Abstract

Purpose: The aim of this study was to determine the influence of anatomical conditions on primary stability in the models simulating posterior maxilla. Methods: Polyurethane blocks were designed to simulate monocortical (M) and bicortical (B) conditions. Each condition had four subgroups measuring 3 mm (M3, B3), 5 mm (M5, B5), 8 mm (M8, B8), and 12 mm (M12, B12) in residual bone height (RBH). After implant placement, the implant stability quotient (ISQ), Periotest value (PTV), insertion torque (IT), and reverse torque (RT) were measured. Two-factor ANOVA (two cortical conditions${\times}$four RBHs) and additional analyses for simple main effects were performed. Results: A significant interaction between cortical condition and RBH was demonstrated for all methods measuring stability with two-factor ANOVA. In the analyses for simple main effects, ISQ and PTV were statistically higher in the bicortical groups than the corresponding monocortical groups, respectively. In the monocortical group, ISQ and PTV showed a statistically significant rise with increasing RBH. Measurements of IT and RT showed a similar tendency, measuring highest in the M3 group, followed by the M8, the M5, and the M12 groups. In the bicortical group, all variables showed a similar tendency, with different degrees of rise and decline. The B8 group showed the highest values, followed by the B12, the B5, and the B3 groups. The highest coefficient was demonstrated between ISQ and PTV. Conclusions: Primary stability was enhanced by the presence of bicortex and increased RBH, which may be better demonstrated by ISQ and PTV than by IT and RT.

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References

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