• The Journal of the Acoustical Society of Korea
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• 제22권2E호
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• pp.69-77
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• 2003

Correlations between acoustic properties and bone density have been investigated in bovine cancellous bone. Speed of sound (SOS), broadband ultrasonic attenuation (BUA), and broadband ultrasonic reflection (BUR) were measured in 10 defatted bovine cancellous bone specimens in vitro. SOS showed a significant correlation with the apparent density of the bone. A comparable correlation was observed between BUA and the apparent density. BUR was rather highly correlated with the apparent density. It was shown that BUR had a weak correlation with BUA and a significant correlation with SOS. This indicates that the parameter BUR can provide important information that may not be contained in BUA and SOS and, therefore, can be useful as an alternative diagnostic parameter of osteoporosis. As expected, a linear combination of all three ultrasonic parameters in a multiple regression model resulted in a significant improvement in predicting the apparent bone density.

• 대한간호학회지
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• 제30권1호
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• pp.29-38
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• 2000

To determine whether personal history of lactation in premenopausal women influence bone mineral density, a cross-sectional study was conducted. One hundred eighty-four premenopausal women were selected from women who had been checked for bone mineral density by dual energy x-ray absortiometry in lumbar spine, femoral neck, Ward's triangle, and trochanteric site at general hospitals in Seoul and Pusan. They completed a questionnaire including life style factors and reproductive history. In the data analysis, Pearson correlation coefficients were used to test any association between individual variables and bone mineral density and a statistical comparisons between long term lactation(>24 months) and short term lactation(<24 months) were made by one way analysis of covariance. The results were summarized as follows: 1) There was no significant difference in the bone mineral density of the lumbar vertebrae in premenopausal women between the long term lactation group(>24months) and the short term lactation group(<24months). 2) There was no significant difference in the bone mineral density of the femur neck, Ward's triangle, and trochanteric site in premenopausal women between the long term lactation group (>24months) and the short term lactation group (<24months). Considering these results, we suggest prospective studies that measure bone mineral density before and after, in addition to those during lactation. We also suggest the further study with premenopausal women less than 35 who have achieved peak adult bone mass.

• Journal of Multimedia Information System
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• 제6권2호
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• pp.67-74
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• 2019

Bone density is one of the factors in the early failure of dental implants and doctors should make a preoperative assessment of jaw bone density using patient's CT data before dental implant surgery in order to find out whether the patient has osteoporosis and osteopenia. The main goal of this study was to propose a method that based on image processing techniques in order to provide accurate information about where to drill and place an abutment screw of implants in the jaw bone for doctors and reduce human activity for the estimation of the local cancellous bone density of mandible using CT data. The experiment was performed on a computed tomography data of the jaw bone of two different individuals. We assumed that the result of the estimation of jaw bone density depends on the angle of drilling and average HU (Hounsfield Unit) values were used to evaluate the quality of local cancellous bone density of mandible. As a result of this study, we have been developed a toolbox that can be used to estimate jaw bone density automatically and found a positive correlation between the angle of the drill and time complexity but a negative correlation between the diameter of the drill and time complexity.

• Journal of the Korean Physical Society
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• 제73권12호
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• pp.1849-1854
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• 2018

The present study aims to investigate the feasibility of using a simple nonlinear acoustic method for the assessment of bone status and osteoporosis in trabecular bone. Correlations of linear and nonlinear ultrasound parameters with the apparent bone density were obtained in 32 bovine femoral trabecular bone samples. Highly significant positive correlations were observed between the apparent bone density and the two linear ultrasound parameters, the speed of sound (SOS) and the normalized broadband ultrasound attenuation (nBUA), with Spearman's correlation coefficients of r = 0.85 and 0.77. In contrast, the apparent bone density was found to be negatively correlated with the nonlinear ultrasound parameter introduced in the present study, the logarithmic difference between the power spectrum levels of the fundamental frequency and the second harmonic (PSL1-PSL2), with the highest correlation coefficient of r = -0.92. These results suggest that the PSL1-PSL2, in addition to the SOS and the nBUA, may be useful for the assessment of bone status and osteoporosis.

• 한국융합학회논문지
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• 제11권10호
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• pp.125-131
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• 2020

본 연구는 엘리트 유소년 태권도 선수들을 대상으로 골절 발생 위험을 감소시키고, 골다공증의 조기진단을 평가하는 지표로 사용되는 골밀도와 운동 수행능력을 판단하는 지표인 심폐기능, 그리고 선수들에게 최대의 적인 스포츠 손상과의 관계를 알아보고자 하였다. 골밀도와 심폐기능 그리고 스포츠 손상 간의 관계를 알아보기 위해 Pearson 상관관계 분석을 시행하였다. 또한, 골밀도가 심폐기능 및 스포츠 손상에 미치는 영향을 알아보기 위해 단순 선형회귀 분석을 시행하였다. 골밀도는 환기량(r=.388) 및 최대산소 능력(r=.478) 그리고 스포츠 손상과 상관관계가 있었다(r=-.292). 또한, 골밀도가 .002, 및 .006씩 증가하면 환기(p=.001) 및 최대 산소능력은(p=.006) 1씩 높아진다. 또한, 골밀도가 .016씩 감소하면, 스포츠 손상의 발생이 1씩 증가한다(p=.044). 선수들의 골밀도 향상으로 스포츠 손상을 예방할 수 있으며, 향후 스포츠 손상 예방 프로그램으로 활용할 수 있을 것이다.

• The Journal of Korean Physical Therapy
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• 제13권1호
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• pp.97-105
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• 2001

본 연구는 2000년 7월 14일부터 8월 24일까지 대구광역시에 소재한 가톨릭병원 건강검진센타에서 골다공증 검사를 시행한 여성 36명을 대상으로 폐경후 여성의 골밀도차이를 비교하기 위해 실시하였다. 연령의 증가에 따라 요추부의 평균골밀도는 감소되었고, 신장이 증가할수록, 교육수준이 높을수록 평균골밀도는 증가했으며, 독신(이혼, 사별, 별거), 활동적인 직업 , 요통이 없다, 육류의 항목에서 평균골밀도는 각각 증가했지만 유의한 차이는 없었다. 골밀도의 표준편차인 T 값은 -2.5이하의 골다공증군이 41.7%로 가장 많았고, 골밀도 (BMD)는 평균 0.77g/c$m^2$로 나타났다. 가족중 골절시 연령이 증가할수록, 운동횟수, 운동시간이 증가할수록, 분만횟수가 증가할수록, 각각 골밀도는 높게 나타났지만 유의한 차이는 없었다. 자궁 절제술은 안했다가, 혈액형은 A형의 항목에서 골밀도는 높게 나타났지만 유의한 차이는 없었다. 폐경후 골밀도에 영향을 미치는 관련성이 있는 요인은 골밀도의 표준편차인 T 값이다(p<0.05). 본 연구는 폐경후 적성의 골밀도 관련요인에 대한 많은 변수를 고려한 전향적인 연구가 필요할 것으로 사료된다.

• Imaging Science in Dentistry
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• 제41권2호
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• pp.59-62
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• 2011

Purpose : This study was performed to evaluate the changes of jaw bone density around the dental implant after placement using computed tomography scan (CT-Scan). Materials and Methods : This retrospective study consisted of 30 patients who had lost 1 posterior tooth in maxilla or mandible and installed dental implant. The patients took CT-Scan before and after implant placement. Hounsfield Unit (HU) was measured around the implants and evaluated the difference of HU before and after implant installation. Results : The mean HU of jaw bone was 542.436 HU and 764.9 HU before and after implant placement, respectively (p<0.05). The means HUs for male were 632.3 HU and 932.2 HU and those for female 478.2 HU and 645.5 HU before and after implant placement, respectively (p<0.05). Also, the jaw bone with lower density needed longer period for implant procedure and the increased change of HU of jaw bone was less in the cases which needed longer period for osseointegration. Conclusion : CT-Scan could be used to assess the change of bone density around dental implants. Bone density around dental implant was increased after placement. The increased rate of bone density could be determined by the quality of jaw bone before implant placement.

• Journal of Community Nutrition
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• 제4권3호
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• pp.195-201
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• 2002

The purpose of this study was to examine the effects of dietary calcium supplementation and exercise on bone mineral density and bone mineral content of growing female rats. The exercise and control group were fed a diet containing 0.5% calcium and Ca supplementation group were fed a diet containing 1.0% calcium diet. The exercise group ran on a rodent treadmill (speed of 15m/min for 30 min) three days per week during the 3-week study period. Bone mineral density (BMD) and bone mineral content (BMC) of spine and femur were determined by using dual energy x-ray absorptiometry (FIXI-mus, GE Lunar Radiation Cooperation, Madison, WI, USA). The exercise group had significantly greater (6.25%) spine BMD compared to the nonexercise group and the exercise group had but not significantly greater spine BMC (7.1%) compared to nonexercisers. Femur BMD and BMC divided by the rats final body weight appears to have a higher BMD (7.5%) and BMC (4.5%) in the exercise group, which indicates that exercise had a positive influence on femur bone mineral density and bone mineral content. The supplementation of calcium did not significantly affect spine and femoral BMC and BMD for the 3 weeks experimental period. It can be concluded that when calcium intake meets the recommended, exercise is beneficial for acquisition of spine bone mineral density in young growing female rats. (J Community Nutrition 4(3) : 195∼201, 2002)

• 대한치과보철학회지
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• 제52권3호
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• pp.233-238
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• 2014

목적: 상, 하악골 혹은 치조골의 골밀도에 대한 지표를 나타낼 수 있는 방법의 개발은 치주질환의 관리, 치과 임플란트 치료 및 전신 골다공증의 진단 등에 유용하게 사용될 수 있다. 대상 및 방법: 팬텀을 포함하는 평행법 촬영기구(XCP)를 이용해 골밀도를 측정하고 이를 정량적 전산화 단층촬영 영상의 값과 비교하여 구강 내 치근단 방사선 영상을 이용한 골밀도 측정의 유용성을 평가하였다. 결과: 실험 결과 치조골의 골밀도에서 두 방법은 0.92 (P<.001)로 높은 상관관계를 보였고, 해면골에 국한된 골밀도는 0.73 (P<.001)으로 비교적 높은 유의한 상관관계를 보였다. 결론: 구강 내 치근단 방사선 영상을 통한 치조골 골밀도 측정의 가능성을 제시하였다.

• Journal of the Korean Association of Oral and Maxillofacial Surgeons
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• 제28권2호
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• pp.95-102
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• 2002

DM is a systemic disease with many complications. One of them, diabetic osteopenia is important sequelae and many authors reported reduced bone mass in diabetic rats. However, in mandible, study has been rare because of its anatomical limits. So the objective of this study was to investigate bony change in mandible of diabetic rats. Thirty-two adult rats were used in this study. Half of them were male and female respectively. In sixteen rats, streptozotocin was injected intraperitoneally to induce DM and the serum glucose concentration was checked to ensure the induction of DM prior to the time of sacrifice. At 1, 2, 3, 4, 6, 8, 12, 16weeks, control group and diabetic group rats were sacrificed respectively. And then bone mineral density of mandibles and femurs of the rats was measured using dual energy X-ray absorptiometry(DEXA). In addition serum osteocalcin and urine deoxypyridinoline were measured as markers of bone formation and resoption respectively. Mandibular and femoral bone density in streptozotocin induced rats was decreased with significance statistically after 4 weeks from injection. In mandible, comparing with femur, bone density was moderately decreased. The alveolar bone in mandible was more decreased bone density than the whole body in the mandible From these results, bone mineral density decreased in uncontrolled diabetic group with time, and especially alveolar bone was more destructive in the mandible. So authors think that consideration of reduced bone mineral density is necessary in dental procedure.