2 0 0 0 OA 頭頸部放射線治療後のう蝕発生リスク因子に関する検討
- 著者
- 曽我 麻里恵 勝良 剛詞 小林 太一 髙村 真貴 黒川 亮 新美 奏恵 田中 恵子 石山 茉佑佳 林 孝文
- 出版者
- 特定非営利活動法人 日本歯科放射線学会
- 雑誌
- 歯科放射線 (ISSN:03899705)
- 巻号頁・発行日
- vol.61, no.2, pp.41-46, 2022 (Released:2022-04-06)
- 参考文献数
- 14
Background and Purpose: Dental caries that arise after radiotherapy (radiation caries) can lead to reduced masticatory function caused by tooth loss and osteoradionecrosis caused by dental infections. There are two main opinions regarding the mechanism underlying radiation caries: 1) tooth fragility caused by the direct effects of radiation and 2) a reduction in the physiological effects of saliva due to hyposalivation and a worsening of oral status. However, it has not been clarified which of these mechanisms is the main cause of radiation caries. Therefore, the purpose of this study was to investigate the risk factors for radiation caries in patients who had received head and neck radiotherapy. Material and Methods: Forty patients who had received head and neck radiotherapy were enrolled. We retrospectively investigated the relationships between radiation caries and clinical parameters, such as the treated site, irradiation field, radiation dose, and oral status, for 3 years after the completion of radiotherapy. Results: The incidence rate of radiation caries was 85%. Twenty-two percent and 78% of radiation caries occurred within and outside the irradiation field, respectively. The incidence rate of radiation caries among teeth within and outside the radiation field was 41.7% and 57.7%, respectively. The occurrence of radiation caries showed a moderate positive correlation with plaque control records. On the other hand, it was not correlated with the total radiation dose, the mean radiation dose delivered to the parotid gland, or the amount of saliva. Discussion: Our results suggested that radiation caries occur both within and outside the radiation field. It is considered that the risk of radiation caries is affected more by oral status, such as poor oral hygiene, than structural changes in teeth caused by radiation. Therefore, it is important to maintain a good oral status after head and neck radiotherapy to prevent radiation caries.
1 0 0 0 OA 顎関節強直症を呈した乾癬性関節炎の1例
- 著者
- 松下 健 林 孝文 伊藤 寿介
- 出版者
- 特定非営利活動法人 日本歯科放射線学会
- 雑誌
- 歯科放射線 (ISSN:03899705)
- 巻号頁・発行日
- vol.35, no.3, pp.182-183, 1995-09-30 (Released:2011-09-05)
1 0 0 0 OA 切歯管嚢胞より発生したと考えられる扁平上皮癌の1例
- 著者
- 林 孝文 伊藤 寿介 中山 均 小林 富貴子 中村 太保 小宮 隆瑞 鈴木 誠 福島 祥紘 高木 律男 大橋 靖
- 出版者
- 特定非営利活動法人 日本歯科放射線学会
- 雑誌
- 歯科放射線 (ISSN:03899705)
- 巻号頁・発行日
- vol.33, no.2, pp.74-80, 1993-06-30 (Released:2011-09-05)
- 参考文献数
- 20
Carcinomas arising in jaw cysts are a very rare lesion. There was only one case report which was thought to be of origin from an inscisive canal cyst.The authors present a case of squamous cell carcinoma probably arising from an incisive canal cyst.The patient was a 60-year-old female with complaints of swelling and tenderness of the hard palate. Overlying mucosa of the lesion was normal except for an opening of fistula.An occlusal X-ray film and bone images of X-ray computed tomography (X-CT) showed a radiolucent lesion on the midline of the palate with well-defined margin and they also revealed an irregular resorption of the alveolar process of the maxilla.Soft tissue images of post contrast X-CT showed a heterogenously enhanced area in the anterior part of the lesion extending to the left upper lip.Pathological examination revealed a squamous cell carcinoma and suggested that the tumor derived probably from an incisive canal cyst.
1 0 0 0 OA 上顎歯肉癌・硬口蓋癌取扱い指針
- 著者
- 高橋 功次朗 丹原 惇 森田 修一 小林 正治 池田 順行 林 孝文 齋藤 功
- 出版者
- 特定非営利活動法人 日本顎変形症学会
- 雑誌
- 日本顎変形症学会雑誌
- 巻号頁・発行日
- vol.27, no.1, pp.1-7, 2017
Cephalometric prediction is still widely used for treatment planning in surgical orthodontic patients. However, there have been few reports on the relationship between mandibular midline changes by orthognathic surgery and the amount of bilateral setback movement on lateral cephalograms. The aim of this study was to clarify the relationships between the difference in mandibular setback amount for deviated and non-deviated sides and the amount of middle region displacement on cephalometric prediction in patients with mandibular prognathism and deviation.<br>The subjects comprised 15 patients diagnosed as mandibular prognathism with skeletal deviation at the orthodontic clinic, Niigata University Medical and Dental Hospital. All patients underwent only mandibular setback surgery involving midline correction by sagittal split ramus osteotomy(SSRO). Frontal and lateral cephalograms taken just before and immediately after orthognathic surgery were used for measurements. X-Y coordinates were constructed using the occlusal plane on the preoperative lateral cephalogram for the X coordinate and the perpendicular line drawn intersecting the X line at the Sella for the Y coordinate. The amount of posterior movement of the distal segment and middle region displacement were determined by superimposition of pre-and postoperative lateral cephalograms. The postoperative midline changes were measured linearly using a study model taken at just before orthognathic surgery. We examined the relationship between the average amount of operative movement for deviated and non-deviated sides and the amount of anteroposterior changes of the incisal region. The relationship between the difference in operative movement for deviated and non-deviated sides and postoperative midline changes was also examined.<br>Significant correlations were found between the bilateral difference of operative movement and the amount of anteroposterior changes of the incisal region. A significant correlation was also revealed between the bilateral difference of operative movement and horizontal middle region. In addition, a significant regression formula was obtained as β=0.65α+1.17(α: bilateral difference of mandibular posterior movement (mm), β: lateral movement of mandibular midline(mm))by regression analysis.<br>The present results suggest that, in cases with skeletal deviation, it is possible to regard the average value of anteroposterior movement of distal segments on both sides as a predictive factor for the posterior position of the incisal region. Also, the results suggest that the amount of midline correction can be predicted from the bilateral difference of operative movement. Since there is diversity and much variation in the movement of distal segments, it is not easy to predict the amount of midline displacement during orthognathic surgery. However, this regression formula may be useful for orthodontists and surgeons to plan surgical orthodontic treatment.
1 0 0 0 舌癌取扱い指針
1 0 0 0 舌癌症例における口底部の介在リンパ節転移の画像診断学的検討
- 著者
- 星名 由紀子 林 孝文 新垣 晋 齊藤 力
- 出版者
- Japanese Society of Oral Oncology
- 雑誌
- 日本口腔腫瘍学会誌 (ISSN:09155988)
- 巻号頁・発行日
- vol.22, no.1, pp.25-36, 2010
- 被引用文献数
- 7
目的:舌扁平上皮癌症例における口底部の介在リンパ節への後発転移の画像所見について検討を行う。<br>対象と方法:1997年から2007年までの間に,口底部の介在リンパ節への後発転移と考えられる腫瘤性病変が出現した舌扁平上皮癌5症例を検討対象とした。いずれも1か月に1回の綿密な超音波診断による経過観察で検出されたものであり,CTとMRI検査が引き続き施行された。われわれは,転移巣が舌下隙後方で顎下腺内側に出現した場合に,外側舌リンパ節と同様の介在リンパ節への転移と考え,傍顎下腺リンパ節転移と呼称することとした。<br>結果:術前画像と頸部郭清で得られた病理標本との照合の結果,2例は外側舌リンパ節転移,2例は傍顎下腺リンパ節転移,1例はそれらの両方と推測された。同期間に口底部の介在リンパ節に転移を来たした症例は潜在的転移が認められた2例を含めて7例であり,頸部リンパ節転移が証明された舌扁平上皮癌43例の16.3%に及んだ。<br>結論:傍顎下腺リンパ節は,外側舌リンパ節とともに舌から上内頸静脈リンパ節にいたる経路の介在リンパ節の役割を有すると考えられた。N0舌扁平上皮癌の経過観察において,外側舌リンパ節と傍顎下腺リンパ節への後発転移を画像で検出するには,正確な解剖学的知識と注意深い観察が必要と考えられる。