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. 2020 Jun 8;13(11):2605.
doi: 10.3390/ma13112605.

Morphological Evaluation of Bone by CT to Determine Primary Stability-Clinical Study

Masaaki Takechi  1 , Yasuki Ishioka  1 , Yoshiaki Ninomiya  1 , Shigehiro Ono  1 , Misato Tada  1 , Takayuki Nakagawa  1 , Kazuki Sasaki  1 , Hiroshi Murodumi  1 , Hideo Shigeishi  2 , Kouji Ohta  2
Affiliations

Morphological Evaluation of Bone by CT to Determine Primary Stability-Clinical Study

Masaaki Takechi et al. Materials (Basel). .

Abstract

Background: Primary stability is an important prognostic factor for dental implant therapy. In the present study, we evaluate the relationship between implant stability evaluation findings by the use of an implant stability quotient (ISQ), an index for primary stability, and a morphological evaluation of bone by preoperative computed tomography (CT).

Subjects and methods: We analyzed 98 patients who underwent implant placement surgery in this retrospective study. For all 247 implants, the correlations of the ISQ value with cortical bone thickness, cortical bone CT value, cancellous bone CT value, insertion torque value, implant diameter, and implant length were examined.

Results: 1. Factors affecting ISQ values in all cases: It was revealed that there were significant associations between the cortical bone thickness and cancellous bone CT values with ISQ by multiple regression analysis. 2. It was revealed that there was a significant correlation between cortical bone thickness and cancellous bone CT values with ISQ by multiple regression analysis in the upper jaw. 3. It was indicated that there was a significant association between cortical bone thickness and implant diameter with ISQ by multiple regression analysis in the lower jaw.

Conclusion: We concluded that analysis of the correlation of the ISQ value with cortical bone thickness and values obtained in preoperative CT imaging were useful preoperative evaluations for obtaining implant stability.

Keywords: computed tomography value; dental implants; implant stability quotient; primary stability.

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Conflict of interest statement

The authors declare no conflict of interest.

Figures

Figure 1
Figure 1
Selection of patients.
Figure 2
Figure 2
Computed tomography (CT) measurement methods. Gutta-percha point (GP): CT value at gutta-percha point. Cortical bone thickness: the thickness of cortical bone at alveolar crest. Cortical bone CT value: mean of 3 CT measurements of the cortical bone at alveolar crest. Cancellous bone CT value: mean CT value for 10 mm2 ROI set in the cancellous bone.
Figure 3
Figure 3
Correlation of each examined factor with the implant stability quotient (ISQ) value in all subjects (n = 247). A. Cortical bone thickness. B. Cortical bone CT value. C. Cancellous bone CT value. D. Insertion torque value (ITV). E. Implant diameter. F. Implant length.
Figure 4
Figure 4
Correlation of each examined factor with the ISQ value in upper jaws (n = 154). A. Cortical bone thickness. B. Cortical bone CT value. C. Cancellous bone CT value. D. ITV. E. Implant diameter. F. Implant length.
Figure 4
Figure 4
Correlation of each examined factor with the ISQ value in upper jaws (n = 154). A. Cortical bone thickness. B. Cortical bone CT value. C. Cancellous bone CT value. D. ITV. E. Implant diameter. F. Implant length.
Figure 5
Figure 5
Correlation of each examined factor with the ISQ value in lower jaws (n = 93). A. Cortical bone thickness. B. Cortical bone CT value. C. Cancellous bone CT value. D. ITV. E. Implant diameter. F. Implant length.
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