J Korean Assoc Oral Maxillofac Surg.  2010 Oct;36(5):417-422.

The study of bone density assessment on dental implant sites

• Park SW
• Jang SM
• Choi BH
• Son HN
• Park BC
• Kim CH
• Son JH
• Sung IY
• Lee JH
• Cho YC

Abstract

INTRODUCTION
Bone density is one of the important factors for the long term success of endosseous implants. The bone density varies from site to site and from patient to patient. A preoperative evaluation of the bone density is quite useful to oral surgeons for planning dental implantation. More accurate information on the bone density will help surgeons identify suitable implant sites, thereby increase the success rate of dental implantation. This study examined the correlation between the bone density measured preoperatively by computed tomography (CT) and the implant primary stability measured by resonance frequency analysis. Furthermore, the effects of the implant sites, gender, age and generalized systemic disorder patients on the bone density and primary implant stability were examined.
MATERIALS AND METHODS
One hundred and fourteen patients were selected. None of the patients had undergone a tooth extraction or bone graft history in the previous year. Preoperatively, the patients underwent CT scanning to evaluate the Hounsfield unit (HU), and resonance frequency analysis (RFA) was used to evaluate the implant primary stability at the time of implant installation. All implants were 4.0 mm diameter and 11.5 mm length US II. All patients were recorded and the HU and implant stability quotient (ISQ) value were evaluated according to the sites, gender and age.
RESULTS
The highest HU values were found in the mandibular anterior site (827.6+/-151.4), followed by the mandibular molar site (797+/-135.1), mandibular premolar site (753.8+/-171.2), maxillary anterior site (726.3+/-154.4), maxillary premolar site (656.7+/-173.8) and maxillary molar site (621.5+/-164.9). The ISQ value was the highest in the mandibular premolar site (81.5+/-2.4) followed by the mandibular molar site (80.0+/-5.7), maxillary anterior site (77.4+/-4.1), mandibular anterior site (76.4+/-11.9), maxillary premolar site (74.2+/-14.3) and maxillary molar site (73.7+/-7.4). The mean HU and ISQ value were similar in females and males. (HU: P=0.331, ISQ: P=0.595) No significant difference was also found in the age group respectively. However, the correlation coefficients between the variables showed a closed correlation between the HU and ISQ value.
CONCLUSION
These results showed close correlation between the bone density (HU) and primary stability value (ISQ) at the time of implant installation (Correlation coefficients=0.497, P<0.01). These results strengthen the hypothesis that it might be possible to predict and quantify the initial implant stability and bone density from a presurgical CT diagnosis. These results strengthen the hypothesis that it might be possible to predict and quantify the initial implant stability and bone density from a presurgical CT diagnosis.

Keyword

Bone density; Hounsfield unit (HU); Implant Stability Quotient (ISQ); Dental implants; Osseointegration

MeSH Terms

Bicuspid
Bone Density
Dental Implantation
Dental Implants
Female
Humans
Male
Molar
Osseointegration
Tooth Extraction
Transplants
Dental Implants

Figure

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  Fig. 1. Image of transaxial cut of Somatom computed tomography (CT). The hounsfield unit (HU) measurement feature of CT was utilized to evaluate the bone density.

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  Fig. 2. Osstell mentor to measure implant stability quotient (ISQ) value.

Reference

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