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asure the rest vertical dimension
Establish the occlusal vertical dimension
Record the centric jaw relationship
Methods, which may be used to assist the patient in closing to a retruded, position.
3) Protrusive record
When a patient protrudes the lower jaw the condyles both move forward and downward, guided by the form of the articular fossae. The downward movements of the condyles result in a similar downward of the lower molar region. The protrusive record measures the amount of the drop. With it the articulator is adjusted so that it will produce a similar amount of drop when a similar amount of protrusion is used. The teeth on the denture can then be arranged so that con tact between the posterior teeth is maintained in protrusion (protrusive balance).
4) The facebow record
5) Selection of teeth.
To choose artificial teeth whose form and colour will harmonize with the patient's featurees.
Laboratory procedures 3
l) Adding the post-dam to the upper denture base.
2) Mounting the baseplates and occlusion rims.
3) Selecting posterior teeth.
4) Setting the teeth.
Clinical stage 4
The trial dentures
To check that the arrangement of the teeth is such that speech and mastication will be restored and to ensure that a pleasing appearance is obtained.
Laboratory procedure 4
At this stage the protrusive record is used to set the condylar track angles and then the occlusion is adjusted to provide balance in eccentric positions. Following this wax surfaces are contoured, the dentures are invested in a flask, and the wax is removed and replaced by acrylic resin.
l) Setting the condylar track angles
2) Developing the lateral and protrusive occlusions.
3) Contouring and finishing the wax surfaces.
4) Processing dentures.
Clinical stage 5
Inserting the completed dentures.
Objective.
l) To check the retention and the accuracy of the jaw relations of the completed dentures, and to adjust where necessary.
2) To instruct the patients in the correct use of their dentures.
3) To advise the patients on the proper care of their dentures and of the denture-supporting tissues.
4) To advise them on the limitations to be expected of artificial dentures.
Laboratory procedures 5
Alter a check centric jaw relationship record has been taken, the lower denture must be remounted in the articulator, and adjustment of the centric and eccentric occlusions made.
l) Remounting
2) Reforming centric lateral and protrusive occlusions.
Clinical stage 6
Adjustment of dentures
l) Use of disclosing wax (on the border) and pressure relief cream (on the fitting surface).
2) Subsequent visits
VOCABULARY
l. artificial substitute 人工替代物
2. denture-supporting area 义齿承托区
3. sulcus (间隙)沟
4. landmark 标志
5. edentulous jaw 无牙颌
6. model 模型
7. tray 托盘
8. primary impression 初印模
9. secondary impression 二次印模
10. compound 印模膏
11. border seal 边缘封闭
12. free activity 自由活动
13. trial denture 试牙
14. balance in eccentive positions 非正中平衡
15. invested flask 装盒
16. processing denture 义齿热处理
17. remounted 重新上合架
18. post-dam 后堤
19. reforming 纠正