CBCT 영상에서 무치악부 임프란트 매식체 주위골 골밀도(HU)의 정량적 평가

Abstract

ABSTRACT

Quantitative assessment of periimplant bone density(HU) on CBCT image

Jong Gook Goo D.D.S. Director Jae Duk Kim Ph.D. Dept. of Dental Science Graduate School, Chosun University

PURPOSE: The primary aims of this retrospective study were to compare subjective bone quality and bone quality based on the Hounsfield scale in different segments of the edentulous jaw and to establish a quantitative and objective assessment of bone quality.

MATERIALS AND METHODS: Twenty eight randomly selected cone beam computerized tomographic(CBCT) scans were used for the analysis. One hundred twelve edentulous areas were selected for evaluation. Implant recipient sites were evaluated visually for Lekholm and Zarb classification. The same sites were subsequently evaluated digitally using the Hounsfield scale with Vimplant2.0TM, and the results were correlated with visual classification. Data was subject to statistical analysis in order to determine any correlation between recorded HU and the regions of the mouth, by using the Kruskal-Wallis test.

RESULTS: The highest unit/mean density value (311 HU) was found in the anterior mandible, followed by 259 HU for the posterior mandible, 216 HU for the anterior maxilla, and 127 HU for the posterior maxilla. These results demonstrate a strong correlation for HU with respect to the 4 regions of the mouth(p<0.001). The relationship between HU and type 4 bone was found to be significant(r=0.74).

CONCLUSIONS: Knowledge of the Hounsfield value as a quantitative measurement of bone density can be helpful as a diagnostic tool by using CBMercuRayTM with VimplantTM software. It can provide the implant surgeon with an objective assessment of bone density, which could result in modification of surgical techniques especially in situations where poor bone quality is suspected.