H. Bashizadehfakhar, A. Talaeepour , A. Dabbaghi ,
Volume 15, Issue 1 (3-2002)
Abstract
Nowadays, bone mass estimation, through imaging methods, is widely used in metabolic diseases diagnosis and treatment. One of these methods is called "optical densitometry" which estimates bone density by measuring the intensity of the transmitted light on different parts of a radiographic image. Digital radiography systems act similarly by determining grey levels of the image. The aim of this study is comparing two different methods of optical densitometry and a digital system densitometry known as radiovisiography. 45 samples, containing urografin with three different concentrations, were imaged, by both radiovisiogrphy (RVG) and conventional film systems. To determine the densitometry of films and radiovisiography images, optical densitometry and bone densitometry option of the RVG software, were applied respectively. Data were analyzed and compared for their reliability (repeatability) and correlations with concentration. In RVG densitometry system, the correlation with concentration is moderate (r=0.42) and intra samples and intra group reliability are 97.68% and 88.19%. Moreover, in conventional optical film densitometry, correlation with concentration (r=0.987) is high, intra samples and intra group reliability is high, intra samples and intra group reliability are 99.97% and 99.84%, respectively. According to the results, it is suggested that conventional film optical densitometry is more precise and reliable than RVG densitometry.
L. Rashedi , Ar. Talaeipour, L. Rashedi ,
Volume 18, Issue 3 (5-2005)
Abstract
Background and Aim: It has been suggested that osteoporosis may be a predisposing factor for periodontitis and tissue destruction, thus periodontitis and mandibular bone density might be related. The purpose of the present study was to evaluate the clinical signs of periodontal tissue destruction in postmenopausal women.
Materials and Methods: In this cross-sectional study, 60 postmenopausal women (51 to 78 years of age) underwent radiographic examination of the right mandibular premolar. Mandibular bone density (MBD) was measured using optical densitometry. Periodontal status variables examined included: probing pocket depth (PPD), clinical attachment level (CAL), bleeding on probing (BOP) and plaque index (PLI). Data were analyzed by statistical tests using P<0.05 as the limit of significance.
Results: This study found no statistically significant association between the four indicators of periodontal disease and mandibular bone density, but there was statistically significant association between mandibular bone density and the number of remaining teeth. There was also statistically significant association between PPD and the number of remaining teeth.
Conclusion: These findings suggest that individuals with high MBD seem to retain teeth with deep periodontal pockets more easily than those with lower MBD.
