[ evaluation of 41 panoramic radiographic cases of dentigerous cysts and odontogenic keratocysts]

Dentigerous cyst [DC] is the most common pathologic pericoronal radiolucency and the odontogenic keratocyst [OKC] radiographic features appear as unilocular, multilocular or pericoronal radiolucency. Since OKC is very invasive and has a high recurrence rate and its radiographic features are like dentigerous cyst and bone important lesions such as amelobastoma and mural ameloblastoma, it seems necessary to recognize radiographic features of these two cysts.The aim of this study was to compare panoramic radiographic findings in DC and OKC. In this descriptive [case series] study, 41 panoramic radiographs of 26 patients with DC and 15 patients with OKC, were evaluated by one maxillofacial radiologist as an observer.The radiographic information included persent pericoronal radiolucency, unilocular or multilocular radiolucency, smooth or scalloped periphery, impacted tooth, size and area of cyst, age and sex. Finally, the data were analyzed using Chi-square and T tests statistically. One case of DC had multiolocular radiolucency, 4 cases of OKC had unilocular pericoronal, 2 cases had multilocular pericoronal, 2 cases had unilocular non-pericoronal radiolucency and 7 cases had non-pericoronal multilocular radiolucency. A significant relationship was detected among the mean age of patients, and mean area of cysts [P<0.05]. Based on the present study, DC was more common in maxillary canine appearing mainly as a pericoronal unilocular pattern, while OKC was more common in mandible appearing mainly as a multilocular pattern

[ one year epidemiologic study on radiolucent lesions in patients referred to radiology department of Mashhad Dental School]

Radiolucent lesions are common bony lesions and can be seen in the forms of periapical, pericoronal, interradicular and lesions not necessarily related to teeth. The purpose of this study was to determine the epidemiology of radiolucent lesions in patients who were referred to radiology department of Mashhad Dental School. In this prevalence descriptive study, panoramic radiographs of 256 patients referred to the radiology department were evaluated for one year and the frequency of their lesions were determined according to age, sex, number of lesions, site of occurrence, shape, border and effects on surrounding structures. The data were statistically analyzed using chi-square test. From 51 radiolucent lesions, the periapical granuloma was the most common lesion [45.1%] followed by periodontal disease [19.6%], radicular cyst [13.7%] dentigerous cyst [3.9%], cherubism, traumatic bone cyst, squamous cell carcinoma and central giant cell granuloma [2%]. These lesions occured predominantly at the second decade of life and most frequently in men. Three common radiolucent lesions were periapical granuloma, periodontal disease and radicular cyst. Periapical granuloma occurs predominantly in mandible while periodontal disease and radicular cyst occur in maxilla more frequently

[Radiographic evaluation of idiopathic osteosclerosis in patients referring to Mashhad dental school from November 2002 to May 2004]

Idiopathic osteosclerosis is a common radiopaque lesion in the jaw bones, which is asymptomatic and usually detected accidentally in various radiographs. The purpose of this study was to determine the radiographic features of idiopathic osteosclerosis in the jawbones of patients referring to the maxillofacial radiology center of Mashhad Dental Faculty. In this descriptive study, panoramic radiographs of 300 patients [ 125 males, 175 females ] who had referred to the maxillofacial radiology department were evaluated for the presence of idiopathic osteosclerosis. The radiographic information included location, number, shape, size, relationship with teeth, pattern of density [ trabecular-cortical ] and demographic data [ age, sex ] and evidence of disease in the gastrointestinal tract and kidneys were also recorded . Then data was analyzed using chi-square and t-student test. A total of 27 patients [9%], exhibited 40 foci of idiopathic osteosclerosis with different shapes and sizes [4 cm[2] to 1/09 cm[2] ], most of which had well defined borders [65%] and trabecular density [62/5%] . The most common region for these lesions was in the mandible, especially in the second premolar [47/5%] and first molar [42/5%] regions and the majority had no connection to the teeth [57/5%]. The lesions were most prevalent in the second decade of life [29/6%] followed by third and fourth decades. [25/9%]. The results of this study were the same as that of previous similar studies. In addition, chronic renal failure was seen in 1/3 of patients with idiopathic osteosclerosis