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Removable Partial Denture

Removable Partial Denture. Introduction. Prosthesis Prosthetics Prosthodontics.

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Removable Partial Denture

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  1. Removable Partial Denture

  2. Introduction • Prosthesis • Prosthetics • Prosthodontics

  3. Prosthodonticsmay be defined as that branch of dentistry pertaining to the restoration and maintenance of oral functions, comfort, appearance, and health of the patient by the restoration of natural teeth and/or the replacement of missing teeth and contiguous oral and maxillofacial tissues with artificial substitutes.

  4. Indications： 1.Partial edentulous arch, specifically the distal-extension partial denture. 2.Immediate denture, temporary denture. 3.Partial edentulous individuals with the absent of alveolar bone, jaw and soft tissue. 4.Occlusal reconstruction.

  5. 5.Removable periodontal splint. 6.Immediate surgical obturation (cleft of palate obturator). 7.Food impaction appliance. 8.Reluctance to grind more teeth.

  6. Contraindications： 1.Psychopath 2.Patients were sensitive to crylic resin.

  7. Advantages： 1. To be widely used 2. Tooth preparation very little 3. Made simply 4. Repaired easily 5. Excessive loss of bone and absent soft tissues may restore by RPD.

  8. Disadvantages ： 1.Unesthetic 2.Caries developed beneath clasp 3.Discomfortable 4.To grind food slowly

  9. Removable Partial denture types: Base type Frame type

  10. Tooth-borne type Mucosa-borne type Mixed-borne type

  11. The Component and Function of RPD

  12. Component Artificial teeth Denture Base Retainer Direct Retainer Indirect Retainer Connector

  13. Function

  14. Artificial Teeth Functions Types

  15. Types: a．resin tooth b．porcelain tooth c．metal-resin tooth

  16. Resin tooth: (Ⅰ) 优点： 与塑料基托为化学性结合；较轻； 不易折断、脱落；容易磨改。 (Ⅱ) 缺点： 耐磨性差；易磨损；咀嚼效能稍差； 易污染变色。 (Ⅲ) 适用范围：较广

  17. Porcelain tooth: (Ⅰ) 优点：硬度大、不易磨损、咀嚼效率高； 光泽好、不易变色。 (Ⅱ) 缺点：脆性大、易折裂、不易磨改； 较塑料牙重。 (Ⅲ) 适用范围：缺牙间隙大、缺牙较多； 牙槽嵴丰满； 邻牙和对合牙无倾斜移位， 对合牙较健康者。

  18. Metal-resin tooth: (Ⅰ) 优点：硬度大，能承担较大的合力； 不易磨损和折断。 (Ⅱ) 缺点：难磨改、调合。 (Ⅲ) 适用范围： 缺牙间隙小、龈距离较短， 合力较大，对合牙伸长移位， 不能排成品人工牙者。

  19. Other types: a．anatomic tooth b．non-anatomic tooth c．Semi-anatomic tooth

  20. Criteria for Selectingthe artificial teeth

  21. Area of anterior teeth: 1. shape 2. size 3. color

  22. Area of posterior teeth : 3D-space

  23. 当今义齿研究和发展： • 硬度——生理性 • 颜色——自然性

  24. Denture Base

  25. Functions of Denture Bases 1.供人工牙排列附着，连接其他各组成。 2.传导分散合力，给缺牙区牙槽嵴一定生理刺激。 3.修复缺损的牙槽嵴硬组织和软组织，恢复面部外形。 4.辅助局部义齿的固位和稳定。

  26. Types of Denture Bases

  27. 1．Resin bases (1)优点： 色泽美观，操作简便，重量轻， 便于修补和衬垫。 (2)缺点： 易折裂，温度传导作用差。

  28. 2．Metal bases (1)优点： 强度高，不易折裂， 较舒适，温度传导好。 (2)缺点： 修理和加补较困难，操作复杂。

  29. 3. Metal-resin bases 兼有金属、塑料基托的优缺点。

  30. Denture Base Considerations: 1．Border Tooth-supported partial denture base Distal extension partial denture base 2．Thickness 3．Location of attaching nature tooth 4．others

  31. 当今树脂基托研究和发展： • 分子结构和基质 • 颜色 • 加工工艺

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