Araki Masao, Matsumoto Naoyuki, Matsumoto Kunihito, Ohnishi Masaaki, Honda Kazuya, Komiyama Kazuo
Department of Oral and Maxillofacial Radiology, Nihon University School of Dentistry, Tokyo, Japan.
J Oral Sci. 2011 Dec;53(4):439-44. doi: 10.2334/josnusd.53.439.
Panoramic radiography and cone-beam computed tomography (CT) were used to analyze asymptomatic radiopaque lesions in the jaw bones and determine the diagnostic relevance of the lesions based on their relationships to teeth and site of origin. One hundred radiopaque lesions detected between 1998 and 2002 were examined by both panoramic radiography and cone-beam CT. On the basis of panoramic radiographs, the region was classified as periapical, body, or edentulous, and the site was classified as molar or premolar. Follow-up data from medical records were available for only 36 of these cases. The study protocol for simultaneous use of cone-beam CT was approved by the ethics review board of our institution. A large majority of radiopaque lesions were observed in premolar and molar sites of the mandible; 60% of lesions were periapical, 24% were in the body, and 16% were in the edentulous region. An interesting type of radiopaque lesion, which we named a pearl shell structure (PSS), was observed on cone-beam CT in 34 of the 100 lesions. The PSS is a distinctive structure, and this finding on cone-beam CT likely represents the start of bone formation before bone sclerosis.
采用全景X线片和锥形束计算机断层扫描（CT）分析颌骨内无症状的不透光性病变，并根据病变与牙齿的关系及起源部位确定病变的诊断相关性。对1998年至2002年间检测到的100例不透光性病变进行了全景X线片和锥形束CT检查。根据全景X线片，将病变区域分为根尖周、牙体或无牙区，病变部位分为磨牙或前磨牙。这些病例中只有36例有病历随访数据。同时使用锥形束CT的研究方案已获本机构伦理审查委员会批准。绝大多数不透光性病变见于下颌前磨牙和磨牙区；60%的病变为根尖周病变，24%为牙体病变，16%为无牙区病变。在100例病变中的34例锥形束CT上观察到一种有趣的不透光性病变类型，我们将其命名为珍珠壳结构（PSS）。PSS是一种独特的结构，锥形束CT上的这一发现可能代表骨硬化前骨形成的开始。
