S Prapayasatok | PubMed Health

PubMed2006

Digital camera resolution and proximal caries detection.

OBJECTIVES: To evaluate the diagnostic accuracy of proximal caries detection from digitized film images captured by a digital camera at different resolution settings. METHODS: Twenty-five periapical radiographs of 50 premolar and 25 molar teeth were photographed using a digital camera, Sony Cyber-shot, DSC-S75 at three different resolution settings: 640 x 480, 1280 x 960 and 1600 x 1200. Seventy-five digital images were transferred to a computer, saved and opened using ACDSee software. In addition, a PowerPoint slide was made from each digital image. Five observers scored three groups of images (the films, the displayed 1:1 digital images on the ACDSee software, and the PowerPoint slides) for the existence of proximal caries using a 5-point confidence scale, and the depth of caries on a 4-point scale. Ground sections of the teeth were used as the gold standard. Az values under the receiver operating characteristic (ROC) curve of each group of images and at different resolutions were compared using the Friedman and Wilcoxon signed rank tests. Mean different values between the lesions' depth interpreted by the observers and that of the gold standard were analysed. RESULTS: Films showed the highest Az values. Only the 1280 x 960 images on the ACDSee software showed no significant difference of the Az value from the films (P=0.28). The digital images from three resolution settings on the PowerPoint slides showed no significant differences, either among each other or between them and the films. For caries depth, the 1280 x 960 images showed lower values of mean difference in enamel lesions compared with the other two resolution groups. CONCLUSIONS: This study showed that in order to digitize conventional films, it was not necessary to use the highest camera resolution setting to achieve high diagnostic accuracy for proximal caries detection. The 1280 x 960 resolution setting of the digital camera demonstrated comparable diagnostic accuracy with film and was adequate for digitizing radiographs for caries detection.

Bicuspid↗

PubMed2004

Analysis of 587 cases of oral squamous cell carcinoma in northern Thailand with a focus on young people.

The increasing incidence of oral squamous cell carcinoma (SCC) especially among younger people has been observed in many parts of the world. The objective of this study was to delineate the profile of patients with oral SCC with an emphasis on younger people in northern Thailand between 1991-2000. The medical records of 587 (median age 65, male-to-female ratio 1:3:1) patients presenting oral SCC were reviewed, with details of demographic data, staging, histological grading, treatment modality and risk factor profile being collated in detail. Seventy-five patients (12.8%) were 45 years of age or below (median age, 39 years). Most patients regardless of age had stage IV disease (56.2%). The most common histological gradings were well or moderately differentiated SCC (79.4%). The most common site regardless was tongue (42.8%). Most patients (79.4%) received treatments with either radiotherapy alone or a combination of surgery and radiotherapy. 64.4% of patients (87.2%) did not have a familial history of cancer. Collectively this data indicates that oral SCC remains a constant problem to the northern Thai population. In addition, the occurrence of oral SCC in young people is relatively high. Therefore, it is recommended that prevention of oral SCC with early detection, early treatment intervention, and withdrawal from risk habits are important factors for improving the wellbeing of these people.

Adolescent↗

PubMed2000

A rare, radiographic 'sunray' appearance in fibrous dysplasia.

We report a case of a 19-year-old Thai woman who had fibrous dysplasia (FD) with a rare radiographic 'sunray' appearance. The sunray appearance could have been due to either an unusual pattern of calcification within the lesion or a periosteal reaction.

Adult↗