ABSTRACT
To estimate the age in forensic identification, when none of the methods is satisfactory, the teeth are used. The aim of the present study was to estimate the age from pulp/tooth area ratio [AR] by digital panoramic radiography in patients referred to a radiography clinic. In this diagnostic study, digital panoramic radiographs of 120 cases were assessed. The chronological age was calculated by subtracting the date of birth from the date of radiographs and the pulp/tooth AR was calculated with "AutoCad" software. Using the regression model, the age was estimated. In this study, the role of sex was also assessed. The mean difference between the chronological and estimated age was 0.11 years in male group. The correlation coefficient was -0,180 and the correlation between age and AR was not statistically significant [p=0.169]. The mean difference between the chronological and estimated age was 0.36 years in female group. Correlation coefficient was -0.336 and the correlation between age and AR was significant [p=0.004]. Negative correlation indicates that by advanced age, pulp/tooth AR decreases. According to the results of this study, AR alone cannot be used for age estimation alone, but it can be used as combined index with other indices for this purpose
Subject(s)
Humans , Male , Female , Dental Pulp , Tooth , Radiography, PanoramicABSTRACT
Due to the widespread use of lateral cephalometric radiography especially in orthodontic therapy and orthognathic surgery, obtaining radiographs of high quality with the least amount of radiation exposure is of utmost importance. The aim of this study was to compare the absorbed dose of head and neck target organs in conventional and digital lateral cephalometric radiography. In this experimental study, RANDO phantom was used for absorbed dose estimation in thyroid, parotid, pituitary and submandibular glands, bone marrow and ocular lens. The phantom was exposed 60 times: 30 times with CRANEX Tome, Soredex and 30 times with CRANEX D, Soredex with standard exposure settings. TLD [GR-200] dosimeters were used to measure organ doses. A total of 69 TLDs were used with 9 TLDs for background radiation. T-test was used for statistical analysis. The mean absorbed dose of target organs was 0.04 +/- 0.005 mSv for conventional and 0.01 +/- 0.002 mSv for digital technique. The difference in absorbed dose in all target organs except for the thyroid gland [P=0.08] between the two techniques of conventional and digital was statistically significant. [P=0.01] $ Use of digital lateral cephalometric system causes a significant reduction in absorbed dose compared to the conventional film-screen system