口腔根管治疗.ppt

History of endodontics The turn of the twenties Early use of x rays Reacceptance of endodontics By the late 1930s 必威体育精装版进展??? ?显微镜下根管治疗和根管内窥镜的应用? 机用镍钛锉和热成型牙胶技术 ?MTA(mineral trioxide aggregate)的应用 数字X线即刻成象技术? 髓腔应用解剖 根尖牙本质- 牙骨质界apical seat or apical stop 侧枝根管lateral canal 副根管accessory canal Types of canal configurations in one root Type 1-single canal from the pulp chamber to the apex Type 2-two separate canals leaving the chamber but merging short of the apex to form only one canal Type 3-two separate canals leaving the chamber and exiting the root in separate apical foramina Type 4 – one canal leaving the pulp chamber but dividing short of the apex into two separate and distinct canals with separate apical foramina Pulp canal anatomy and access prepararations Maxillary central incisor Always has one root and Type 1 canal configuration The root is slight distal axial inclination A cross section of tooth in the cervical area shows that the canal has a slightly triangular shape Penetration of the mesial portion the root Maxillary lateral incisor More slender than in the maxillary central incisor Always has one root and Type 1 canal configuration The root is slight distal or lingual curvature A cross section of tooth in the cervical area shows that the canal has a slightly oval shape Penetration of the mesial portion the root Maxillary cuspid Always has one root and Type 1 canal configuration The root is the longest in the arch A cross section of tooth in the cervical area shows that the canal has an oval shape mandibular central and lateral incisor Always has one root and type 1 had 60%,type 2 showed 35% and type 3 were classified as 5% The root is slight distal or lingual curvature A cross section of canal in the cervical area shows that the canal has a long thin oval shape which is very constricted mesiodistally Penetration of the mesial portion the root Lateral perforation in the thin incisor Mandibular cuspid Usually has one root ,the longest of the mand