アブストラクト（24巻1号：神奈川歯学）

神奈川歯学

Japanese

Title　： 炎症時における歯髄血管網の立体的観察
Subtitle　： 原著
Authors　： 下里直弘, 高橋和人
Authors（kana）　：
Organization　： 神奈川歯科大学口腔解剖学教室
Journal　： 神奈川歯学
Volume　： 24
Number　： 1
Page　： 96-116
Year/Month　： 1989 / 6
Article　： 原著
Publisher　： 神奈川歯科大学学会
Abstract　： 「緒言」歯髄炎は細菌の感染によることが最も多いとされているが, このほかに化学的刺激や物理的刺激によっても起こる. う蝕に継発する歯髄炎は, まず細菌毒素が象牙細管を通り歯髄へ進入し, いわゆる漿液性歯髄炎となり, 次いで細菌自身の進入により化膿性歯髄炎となり, その後侵襲の持続時間や歯髄の抵抗力により一進一退を繰り返しながら歯髄死という終局を迎える. それに対し物理的刺激に継発する歯髄炎は, 窩洞形成時の歯質の切削によって発生する熱が歯髄の損傷の最も大きな原因であることが証明されている. たとえばStanley(1959)とSwerdlow(1958), Langeland(1959)は実験的に窩洞形成を行い歯髄炎を惹起させ, 炎症の程度は可逆的なものから回復不可能な変化まであったことを報告している. また, PohtoとScheinin(1958)らは切削時の歯髄内の温度の上昇により, 血行が停止し, 細静脈と毛細血管の透過性の変化を観察し歯髄炎が熱によっても惹起されることを報告した.
Practice　： 歯科学
Keywords　： 炎症, 歯髄血管網, SEM

English

Title　： Three Dimentional Study of the Pulpal Vascular Changes During Inflammation
Subtitle　： Original article
Authors　： Naohiro SHIMOZATO, Kazuto Takahashi
Authors（kana）　：
Organization　： Department of Oral Anatomy, Kanagawa Dental College
Journal　： Kanagawa Shigaku
Volume　： 24
Number　： 1
Page　： 96-116
Year/Month　： 1989 / 6
Article　： Original article
Publisher　： Kanagawa Odontological Society
Abstract　： Abstract : In this study, the changes of canine pulpal vascular architecture, at various stage of growth when subjected so acute and chronic inflammation were examined through a scanning electron microscope using vascular corrosive resin casts. The following results were obtained. 1. The sites of leakage of MMA resin out of the blood vessels coincided with the site where microleakage occurred, thus suggesting that resin cast method is a useful technique to study the area where vascular permeability was increased. 2. In an acute inflammation, leakage of resin out of blood vessels was mainly observed at the sites of venular network (VN) and venous capillaries, and these could be discriminated by use of the casts method. This is in accordance with the result by Tsuchiya, Magino and Palade, where they showed that vascular permeabilisy was preferentially observed in venule and venous capillaries. 3. In pulp with a lesser number of venules during the stage of late maturation, leakage of resin was observed from those surviving vennules to the bundle of main blood vessels. 4. Leakage of resin was not observed in the terminal capillary network (TCN), but in the capillary network (CN) and VN, especially just beneath the dentin, where cavity preparation with a water spray was performed. Accordingly, the generation of heat during cavity preparation was thought to be the main reason for disturbance of the pulp. 5. Severe case of suppurative and chronic ulcerative pulpitis were generated within one week after cavity preparation. The vascular architecture was characterized by a dense granular capillary network facing the ulcerative surface.
Practice　： Dentistry
Keywords　： SEM