27 Questions
What is a secondary impression?
An impression made in a special tray for making the master cast
What are the types of Removable Partial Dentures based on functional design classification?
Tooth Borne Partial Dentures and Extension Base Partial Dentures
What factors influence the support of a distal extension base?
Quality of soft tissue covering edentulous ridge
What is the difference in displacement between the periodontal ligament (PDL) and the mucosa?
0.25mm for PDL and 2mm for mucosa
Which impression material can be used for functional impression techniques?
Zinc oxide and eugenol paste
When is the functional relining method accomplished?
Before the insertion of the partial denture
What must be corrected after the denture base has been processed in functional relining method?
Occlusal discrepancies
What is the purpose of the space provided on the tissue surface of the denture base in functional relining method?
To allow room for the impression material
What is the characteristic of fluid wax used in functional impression techniques?
Firm at room temperature and flows in mouth temperatures
What is the purpose of border molding in functional relining method?
To record the contours of the tissues and the functional movements of the mouth
What is the disadvantage of functional relining method mentioned in the text?
Failure to maintain correct occlusion
What is added and border molded in the functional relining method?
Low fusing compound
What is used to make the wash impression in functional relining method?
Free flowing zinc oxide
What is the objective of functional impression techniques?
Equalizing support from edentulous area and abutment teeth
When is the anatomic impression used?
For tooth-supported removable partial dentures
What is the purpose of dual impression in prosthodontics?
To obtain maximum support from the edentulous area for extension partial dentures
What is the difference between anatomic and physiologic impressions?
Anatomic impression involves minimal displacement of tissues, while physiologic impression involves placing occlusal or finger load on the edentulous area
What are the indications of functional impressions?
Mandibular distal extension ridge and long-span anterior edentulous ridge
How are techniques for anatomic impressions characterized?
Pressure-free records of teeth and soft tissues in their anatomic form
What is the purpose of two-section impressions and one or two-section casts in prosthodontics?
To involve minimal displacement of tissues covering the residual ridge
Which technique involves finger pressure through circular openings in the posterior region of the hydrocolloid impression tray?
Hindle's technique
What is required for Hindle impression?
Custom tray over edentulous areas
What is the drawback of Hindle's technique?
Variable interpretation of functional loading by the dentist
What are the disadvantages of physiologic impressions?
Compromised blood flow and tissue rebound
What does the one-stage selected pressure impression technique involve?
A single impression made before framework construction
What is involved in the selective pressure impression technique?
Adding low fusing compound in the edentulous areas and border molding
What is involved in the altered cast method?
Evaluating the RPD frame, making an impression tray, and border molding using low fusing modeling plastic
Study Notes
Denture Impression Techniques and Methods
- Hindle's technique involves finger pressure through circular openings in the posterior region of the hydrocolloid impression tray.
- Custom tray over edentulous areas is required for Hindle impression.
- The drawback of Hindle's technique is the variable interpretation of functional loading by the dentist.
- Disadvantages of physiologic impressions include compromised blood flow and tissue rebound.
- The one-stage selected pressure impression technique is a single impression made before framework construction.
- Selective pressure impression involves adding low fusing compound in the edentulous areas and border molding.
- The one-stage selected pressure impression technique requires adapting two layers of base plate wax for alginate bulk.
- The altered cast method involves evaluating the RPD frame, making an impression tray, and border molding using low fusing modeling plastic.
- The altered cast technique uses fluid waxes like Iowa wax and Korrecta wax No 4 on a special tray made from acrylic resin.
- Holes are drilled opposite to the residual ridge and retromolar pad in the altered cast technique to allow escape of excess impression material.
- Vent holes are placed in the plastic tray near the finish line for escape of excess impression material.
- Retention grooves are placed in the cast for the sectional impression, which is beaded and boxed for pouring in vacuum-mixed stone.
Test your knowledge of denture impression techniques and methods with this quiz. Learn about various impression techniques such as Hindle's technique, physiologic impressions, selective pressure impression, altered cast method, and more. Explore the advantages and disadvantages of each method and understand the specific steps involved in creating accurate denture impressions.
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