可摘局部义齿(英文)

Summary
Review
1. 2. 3. 4.
Is the primary purpose of a denture base related to masticatory function? If so, how? Define the term major connector in your words. There are basically four types of maxillary major connectors. Name and describe them. Give 3 types of mandibular major connectors. Describe them characteristics.
other components of the prosthesis,
such as the clasp assembly, indirect retainers, occlusal rests, or cingulum rests.
Functions
1.To transfer functional stress to the abutment. 2.To transfer the effect of the retainers, rests, and stabilizing components to the rest of the denture.
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。
Other types:
a．anatomic tooth
b．non-anatomic tooth c．Semi-anatomic tooth
(2)缺点：
易折裂，温度传导作用差。
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。
3. Metal-resin bases
兼有金属、塑料基托的优缺点。
Denture Base Considerations:
1．Border
Contraindications：
1.Psychopath 2.Patients were sensitive to crylic
resin.
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.
(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
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。
Disadvantages ：
1.Unesthetic
2.Caries developed beneath clasp
3.Discomfortable 4.To grind food slowly
Removable Partial denture types:
Base type Frame type
3 ． Types connectors
of
maxillary
major
Maxillary major connector
(1)腭杆 palatal bar
a．前腭杆：位于腭前区，离开龈缘6mm，
厚1mm，宽8mm。
b．后腭杆：位于上腭硬区之后，颤动线之前，
两端位于第一、二磨牙之间， 厚1—1.5mm，宽3.5mm。
Tooth-supported base Distal base extension partial partial denture denture
2．Thickness 3 ． Location of attaching nature tooth
当今树脂基托研究和发展：

分子结构和基质


颜色
(2)舌板
lingual plate
金属铸成舌基板，覆盖在下前牙的舌隆突区。 常用：口底浅；舌侧软组织附着高；舌隆突明显者。 特别适用： a．前牙松动需用夹板固定者。
b．舌系带附丽过高或口低浅不能容纳舌杆者。
c．舌侧倒凹过大不宜用舌杆者。
(3)颊杆（唇杆） buccal (Labial)bar
位于龈下3mm
适用：余留牙向舌侧严重倾斜者，
无法使用上述大连接体者。
(二) minor connector
Minor connectors are those components that serve as the connecting link between the major connector or base of a removable partial denture and the
Mendibular major connector
(1)舌杆
lingual bar
a．位置：位于下颌舌侧龈缘与舌系带或粘膜皱襞 之间呈半犁形， 宽5mm、厚2mm、距龈缘4mm， 边缘薄而圆滑。 b．应用范围 c．与粘膜关系根据下颌舌侧牙槽骨形态而定为三型： 垂直型—与粘膜平行接触 倒凹型—与最突处接触，在非倒凹区 斜坡型—离开粘膜0.3—0.4mm d．舌隆突杆，双舌杆
Criteria for Selecting the artificial teeth
Area of anterior teeth:
1. shape 2. size
3. color
Area of posterior teeth :
3D-space
当今义齿研究和发展：

硬度——生理性 颜色——自然性
4.Occlusal reconstruction.
5.Removable periodontal splint. 6.Immediate surgical obturation (cleft of palate obturator). 7.Food impaction appliance. 8.Reluctance to grind more teeth.
Removable Partial Denture
Introduction
Prosthesis Prosthetics
Prosthodontics
Prosthodontics
may be defined as that
branch of dentistry pertaining to the restoration and maintenance of oral functions, comfort, ce, 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.
2．Design criteria
Made from an alloy compatible with oral tissues. Rigid and uses the principles of broad distribution of stress. Does not interfere with and is not irritating to the tongue. Does not substantially alter the natural contour of the lingual surface of the mandibular alveolar ridge or of the palatal vault.
• Location
A minor connector contacting the axial surface of an abutment should not be located on a convex surface; instead it should be located in an embrasure where it will be least noticeable to the tongue.
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.




Does not impinge on oral tissues when the restoration is placed, is removed, or rotates in function. Covers no more tissue than is absolutely necessary. Does not contribute to the retention or trapping of food particles. Has support from other elements of the framework to minimize rotation tendencies in function. Contributes to the support of the prosthesis.