牙周牙髓联合病变ppt课件

14 牙周牙髓联合病变 Periodontal-Endodontic Combined Lesions 14-1 牙周组织和牙髓的解剖通道 Anatomical Interrelations of Peridontium and Pulp 根尖孔 Apical foramen 根管侧支 Lateral root canal 或副根管 Accessory canal 根尖 1/3处最多 根分叉区 20-60%有 The pulp was non-vital and the tooth was endodontically treated. After prosthetic therapy The pulp was non-vital and the tooth was endodontically treated. After prosthetic therapy (c), the 2 -year follow-up radiograph in (d) shows bone fill in the previous angular bony defect, whereas the marginal bone remains at the same level. On careful examination one can see that a lateral canal communicating with the lateral bone defect was filled. 牙本质小管 Dentinal tubules 解剖异常 Anatomical abnormalities 腭侧沟 牙根外吸收 根裂 14-2 牙周 -牙髓联合病变的临床类型 Clinical Patterns of Periodontal-Endodontic Combined Lesions 1， 根尖感染经牙周组织途径排除，有人称之为逆行性牙 周炎 (retrograde periodontitis) 牙髓根尖周病对牙周组织的影响 influence of endodontic lesions on the periodontium 根尖脓肿沿牙周的可能排脓途径 Schematic illustration demonstrating possible pathways for drainage of a periapical abscess into the gingival sulcus/pocket. (a) periodontal ligament fistulation. (b) extraosseous fistulation periodontal ligament fistulation. 此型在临床上易被误诊为牙周脓肿 特点： 死髓牙 窄而深的牙周袋，无明显的牙槽嵴吸收 only a narrow opening of the fistula into the gingival sulcus/pocket and may not be detected unless careful probing of the sulcus is carried out at multiple sites. 邻牙一般无严重的牙周炎 X片显示烧杯型或日晕型病变 after 18 M In multirooted teeth a periodontal ligament fistulation can drain off into the furcation area ，牙髓治疗过程中或治疗后造成的牙周病变 根管侧穿，髓室底穿，髓室或根管内的药物（砷 戊 二醛 塑化液 干髓剂等） During endodontic treatment, and in conjunction with preparation of root canals for the insertion of posts, instrumentation can accidentally cause perforation of the root and wounding of the periodontal ligament Angular bone defect at the distal root surface of a mandibular premolar (arrows). The root is per forated. Conceivably, this occurred in conjunction with preparation of the root canal for a post and core. Clinical symptoms included drainage of pus from the pocket and increased tooth mobility. The tooth was extracted. Perforation of the pulpal floor of the mandibular first molar occurred in conjunction with a search for root canal openings (a). The perforation was immediately sealed with gutta-percha (b). One month after treatment a slight radiolucency appeared at the perforation site (arrow) in the periodontium (c). After an observation period of 2 years, normal periodontal conditions were re- established both clinically and radiographically RCT治疗后可发生牙根纵裂 : 主要由于扩根过度 ,桩核不当 , 过大合力等 共同特点 : 牙髓无活力 病变局限于单个牙，局限于患牙的局部 病变呈烧杯状， 邻牙基本正常 Vertical root fracture 结局 : Vertical root fractures that involve the gingival sulcus/pocket area usually have a hopeless prognosis due to continuous bacterial invasion of the fracture space from the oral environment. External Root resorption Surface resorption A surface resorption is initiated subsequent to injury of the cementoblastic cell layer. Osteoclasts are attracted by substances from the damaged tissue on the denuded root surface and resorb the hard tissue These resorptions may be caused by a localized injury in conjunction with external trauma (Andreasen 1981) and by trauma from occlusion. Resorption may also result from excessive orthodontic forces. This type of resorption is common, self-limiting and reversible Replacement resorption This type of resorptive process results in a replacement of the dental hard tissues by bone, hence the name Replacement resorption and ankylosis are often used as synonyms. Clinically, ankylosis is diagnosed by absent tooth mobility and by a percussion tone that is higher than in a normal tooth External inflammatory resorption The term external inflammatory resorption suggests the presence of an inflammatory lesion in the periodontal tissues adjacent to a resorptive process 牙周病变对牙髓的影响 Iinfluence of periodontal disease on the pulp 1, 逆行性牙髓炎 Retrospective pulpitis 2，长期存在的牙周病变：轻者 修复性牙本质 重者 炎症 变性 钙化 坏死 因牙周炎拔除的无龋牙， 64%有牙髓的炎症或坏 死，与 PD成正比 3，牙周治疗对牙髓的影响 Influence of periodontal treatment measures on the pulp 14-3 治疗原则 Treatment strategies for vombined endodontic and periodontal lesions 确定原发原