Journal List > J Korean Acad Periodontol > v.39(2) > 1049789

Ko, Park, Kim, Song, and Lee: Observation of the change of the dental implant stability and bone density evaluation methods

Abstract

Purpose

The aim of this study was to examine the correlation of the subjective and the objective evaluation of edentulous ridge bone quality, and to evaluate the change of the dental implant stability in each bone density group for early healing period after implant installation.

Methods

Sixty-seven implants(Osstem implant®, Seoul, Korea) were included in this study. We evaluated the bone density by 2 methods. The one was the subjective method which was determined by practitioner's tactile sense, the other was the objective bone type was based on Hounsfield units. The implant stability in each bone type group was assessed by resonance frequency analyzer(Osstell mentor®). Data were analyzed for the change of the implant stability, and they were compared to verify the difference of groups at the time of installation, 2, 6, 10, 14 weeks postoperatively. Spearman's correlation was used to demonstrate the correlation between the subjective and the objective evaluation of the bone density, and analysis of variance(ANOVA) was used to analyze the differences of implant stability at each time point.

Results

There was no close relation between the subjective and the objective evaluation of the bone density(r=0.57). In the subjective groups, there was statistically significant difference between the type 1 and 3 at 10 weeks and between the type 2 and 3 at 14 weeks. In the objective groups, there was no statistically significant difference between the D 1, 2, 3, 4, and 5 group with regard to RFA from baseline to 14 weeks(P>0.1).

Conclusions

The implant stability increased over time during the study, and it was improved with bone density proportionally after 2weeks postoperatively. It is recommended that the decision of bone density is base on Hounsfield unit for implant loading time.

Figures and Tables

Figure 1
Measuring RFA was done 2 times buccally and mesially.
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Figure 2
The change pattern of the ISQ mean value over time.
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Figure 3
The change patterns of the ISQ mean value in the subjective grouping over time. *Statistically significant difference (P<0.05).
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Figure 4
The change patterns of the ISQ mean value in the objective grouping over time.
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Table 1
Distribution of Installed Implants in Jaw Area
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Table 2
Number of the Subjective Bone Type and the Objective Bone Quality
jkape-39-185-i002

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