文档介绍：牙折的病因及治疗方法PPT
病因
外力直接撞击,咀嚼咬到沙石、碎骨等硬物。
be impacted by force,biting hard food.
Etiology
临床表现
Clinic character联合折crown-root fracture：
可作根管治疗，具备桩核冠修复的冠根联合折，应保留。
The tooth with crown-root fracture which can be restored by a post retained full crown should be saved to receive RCT
牙根纵裂
vertical root fracture
发生在牙根的纵裂,未波及牙冠者。
Vertical root fracture, not involving the crown.
病因
慢性持续性的创伤合力
牙根发育缺陷
无髓牙
Etiology
Chronic durative traumatic occlusal force
Defect of root development
Pulpless tooth
无髓牙
Pulpless tooth
内因：牙本质脱水，失去弹性，牙变 脆，致使牙抗折力降低。
外因：
侧方加压充填根管
桩或桩核修复
其他
临床表现
X线检查对诊断牙根纵裂有重要意义
Diagnosis can be carried out by radiographic examination
Clinic characteristics
治疗
Treatment
松动明显，牙周破坏严重或单根牙的牙根纵裂，均应拔除。
The tooth should be extracted if it is very loose or of severe periodontal lesion or vertical root fracture in single rooted tooth.
牙周病损局限且牙稳固的磨牙，可在根管治疗后行牙半切术或截根术。
Tooth hemiresection or root resection is performed after RCT if the molar is steady and of limited periodontal lesion.
牙半切术
tooth hemiresection
截根术
root resection
慢性损伤
磨损
楔状缺损
磨牙症
牙隐裂
酸蚀症
第七章 牙体慢性损伤
楔状缺损
wedge-shaped defect
楔状缺损是牙齿唇、颊颈部硬组织缓慢磨耗所致，因该缺损常呈楔状而得名。
Wedge-shaped defect is caused by tardy abrasion of buccal cervix hard tissues.
刷牙不当
病因
牙颈部结构
Structure of tooth cervix
Improper teeth brushing
Etiology
酸作用
牙体组织疲劳
Acid erosion
Weariness of hard tissues
临床表现
由2～3个平面组成，坚硬光滑，为牙本色。
Usually have 2 or 3 surfaces,hard and smooth,tooth-like color。
Clinic characteristics
根据缺损程度分浅型、深型和穿髓3型
前磨牙好发，常左右对称，有牙龈退缩
随年龄增长，楔状缺损有增加趋势
Be classified with shallow,deep and pulp exposure according to the depth of the lesion
Most commonly occur on the buccal surface of bicuspids symmetrically and accompany with gingival recession
The sizes of abrasions increase with age
治疗和预防
改正刷牙方法
牙体缺损少无牙本质过敏，不需处理。
Correct tooth brushing
Treatment and prevention
Careful observation if there is no t