Ar. Talaeipour , M. Shaikholeslami, N. Ramazankhani ,
Volume 14, Issue 3 (9-2001)
Abstract
One of the major factors in a successful root canal therapy is the determination of root length before canal preparation. Radiography has been proved to be useful in this case, but nowadays for reducing radiation, radiovisiography has been recommended. The aim of this study was comparing conventional radiography (CR) with radiovisiography (RVG) in determination of canal length. 101 anterior and posterior extracted human teeth were selected. After mounting in unolit block, K- file (Num. 15) was placed in canal with tactile sense. Working length was measured by C.R and RVG. The results were analyzed by complete, randomized block design. RVG and CR showed shorter length than actual length. But, the measured lengths did not show significant statistical differences. As a result, considering the advantages of RVG, it is recommended in determining canal length.
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.
Ar. Talaei Pour , S. Mehralizadeh , A. Mesgarzadeh ,
Volume 18, Issue 1 (3-2005)
Abstract
Statement of Problem: Computed tomography (CT) has proved to be the most precise method to evaluate the quantity of jaw bones.In recent years, patient dose which is much more greater in CT than conventional methods has attracted more attention, and has brought the idea of using the conventional method in more accurate ways or applying new methods with lower doses.
Purpose:radiovisiography for presurgical evaluation of endosseous implants.
Materials and Methods: measured with the two aforementioned techniques. To determine the magnification factor, an acrylic stent with spherical lead markers with known diameter, has been used. Then in intra-operative phase, this distance was measured directly on the patient’s jawbone. To assess the significance of differences from radiography results and the gold standard the binomial distribution was used.
Results:significant and there was no significant difference between RVG and visual method.
Conclusion:to conventional tomography.
Radiography is the main tool for presurgical assessment of endosseous implants.The goal of this study was the assessment of the accuracy of conventional tomography andDistance between alveolar margin and superior border of mental foramen wasFindings showed that the differences between conventional omography and visual methods wereThis study revealed that the radiovisiography method showed more precise results in comparison
