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1、Post Crown and Post-Core Crown,Zhu ziyuan Staff Room of Prosthodontics,Post crown (Dowel Crown) Post-core crown (Dowel-core Crown, Post and core system ),Whats the post crown and post-core crown? Whats the difference between the post crown and post-core crown? When do people need one? What influence
2、 the retention and strength? Whats the point of tooth preparing? How to fabricate it?,Emphases,Definition of post crown,是利用冠桩插入根管内以获得固位的一种冠修复体。,Definition of post crown,advantages of post-core crown,change crown without change post,advantage of post-core crown,change direction of the tooth restore t
3、he extensive tooth defect with full crown,When is the right time,Perfect RCT ( root canal therapy 根管治疗),When is the right time,12 weeks after RCT completedFistula cicatrized,When is the right time,Lesion around apex limited,Indications of post-core crown,Extensively damaged toothThe defect is in sub
4、gingival area,Anterior tooth fracture（trauma）,Malposition (错位) or torsiversion (torsoclusion 扭转),Indications of post-core crown,malformed (畸形) tooth,Indications of post-core crown,As a retainer for FPD( Fixed partial denture 固定义齿),Contraindication of post-core crown,Age under 18Inflammation with cli
5、nical symptomSevere bone absorption (1/3 of root),the root canal is curved and tiny,Contraindication of post-core crown,A lateral cleft in root cannel,Contraindication of post-core crown,An oblique fracture under alveolar crest,Contraindication of post-core crown,The broken post can not be taken out
6、. Deep bite, compact occlusion.,Contraindication of post-core crown,Retention and strength,length: 2/3-3/4 length of the root 4mm apical seal remained Length of the post length of the crown,Length of the post inside alveolar 1/2 length of the root inside alveolar,Retention and strength,diameter: 1/3
7、 of the roots diameter,Retention and strength,shapecross section shape,Retention and strength,external shapeparallel postcone-shaped posttrapeziform post,Retention and strength,Retention and strength,external shapeSmooth postscrewed postserrated post,Retention and strength,Smooth post,Screwed post,R
8、etention and strength,Connection between crown and root surface Dentinal ferrule,Retention and strength,Connection between crown and root surface Dentinal ferrule,Types of post-core,Metal post-core,Cast metal post-core,Preformed ( prefabricated ) post-core,Types of post-core,Non-metal post-core,Glas
9、s fiber post,Carbon fiber post,Ceramic post,Coronal portion preparation,Reduce the tooth with crown preparation,Teeth preparation,Coronal portion preparation,Remove all caries,Teeth preparation,Coronal portion preparation,Remove unsupported tooth structure,Teeth preparation,Canal preparation,Teeth p
10、reparation,Root surface preparation,Teeth preparation,Fabrication of post-core,Fabrication of non-cast post-core,Fabrication of non-cast post-core,Fabrication of non-cast post-core,Fabrication of non-cast post-core,Fabrication of non-cast post-core,Fabrication of cast post-core,Impression of cast po
11、st-core Direct method( metal post-core),Fabrication of cast post-core,Impression of cast post-core,Impression of cast post-core Direct method( metal post-core),Impression of cast post-core,Impression of cast post-core Direct method( posterior metal post-core),Impression of cast post-core,Impression of cast post-core Indirect method,Impression of cast post-core,Impression of cast post-core Indirect method,Laboratory process of cast post-core,Try in and cementation of cast post-core,Finished restoration,
