A Comparative Study of Radiographic Images on Normal Anatomical Structures / 대한구강악안면방사선학회지

PURPOSE: To compare radiographic images of Digora system and Ektaspeed Plus film obtained from normal adults. MATERIALS AND METHODS: Storage phosphor plate(SPP) was placed in a film holder behind Ektaspeed Plus film package without lead foil. The effect of film on SPP was studied in a separate in vitro experiment. Forty-seven sets of images were prepared for the evaluaton. The regions of interest(ROI) for evaluation were designated at seven sites including normal anatomical structures. The image quality for each ROI was evaluated on enhanced and unenhanced storage phosphor(SP) images and Ektaspeed Plus film. RESULTS: Two film-SPP configurations showed significantly different grey levels at each step of the aluminum step wedge(p<0.05). The contrasts were comparable. Enhanced SP images were significantly superior to unenhaned images and film in all anatomical sturctures(p<0.01). The differences between unenhanced SP images and film were significant(p<0.05) except root canal and cortical bone on alveolar crest. For anatomical items, there were statistically significant difference among five observers(p<0.05). CONCLUSIONS: The image quality of enhanced SP images were superior to Ektaspeed Plus film, and Digora system is potentially applicable to clinical diagnosis.

A Study Of Cementifying Fibroma / 대한구강악안면방사선학회지

Cementifying fibroma is an odontogenic tumor of periodontal ligament origin, consistingof a proliferation of fibrous tissue that forms cementum. Cemento-ossifying fibroma, cemenrifying fibroma and ossifying firoma are difficult to distinguish on clinical and radiographic examination, and on histoapathology. However, when the calcified products is represented by ovoid or curvilinear deposites, the lesion is often referred to as cementifying fibroma. Cementifying fibroma of the jaws are well-circumscribed, generally slow-growing lesions. Although most lesions appear to be limited to the tooth-bearing areas, a few have extended into the angle-ramus area or encroached on the maxillary sinus. Radiographically, the cementifying fibroma could present as a radiolucent, radiopaque or mixed density lesion, depending on the degree of maturity. We have oberved two cases f cementifyingfibroma occurred in the left maxillary premolar-molar area of 38-year-old woman and 35-year old man. We obtained that two cases were shown the followed results ; 1. Clinically, main clinical sympton was facial swelling and pain at palpation. 2. Radiographically, well-circumscribed radiolucent lesion and radiolucent lesion with radiopaque foci were seen on the left maxillary premolar-molar areas. Loss of lamina dura and root resorption or divergency were also seen. 3. Histopathologically, many cementum-like calcifications were observed in the hypercellular connective tissue.