12 Questions
What is the purpose of finishing and polishing in dentistry?
To enhance esthetic, function, and oral health
What is the recommended approach for finishing a casting?
Follow a definite sequence for finishing
Why is it important to use high speeds for finishing a casting?
To speed up the cutting process and reduce risks
What happens if contaminated wheels are used during finishing?
Foreign particles may become embedded in the surface
Why should each finishing operation completely remove scratches left by the preceding one?
To ensure a smooth and glossy finish
Which equipment is necessary for polishing in dentistry?
Rubber abrasive wheels and polishing wheels
What is the purpose of using a separating disc in the finishing and polishing procedure for a casting?
To effectively remove sprue ends on the casting after separation
Why should pliers never be used to remove partial denture sprues during the finishing process?
They distort the framework
What is the main purpose of pickling in the finishing and polishing process of a metal casting?
To remove surface oxides from the metal
Why is it essential to use a commercial pickling solution rather than a strong acid in the pickling process?
Strong acid produces harmful vapors
What is the final step in achieving a high polish on a casting framework according to the text?
Polishing with a rag wheel and tripoli
Why are plastic retention areas not subjected to the same finishing steps as the rest of the casting framework?
Plastic areas do not require finishing
Study Notes
Finishing and Polishing of Dental Prosthesis
- Finishing is the process of smoothing and trimming a prosthesis before final polish, while polishing is making a denture or casting smooth and glossy.
- The aims of finishing and polishing are to improve esthetics, function, and oral health.
Rules for Finishing a Casting
- High speeds are preferable to low speeds for finishing a casting.
- The wheels or points and their speed of rotation should do the cutting.
- A definite sequence for finishing should be adopted and followed for every framework.
- Clean polishing wheels should be used to avoid embedding foreign particles in the surface.
- Each finishing operation should completely remove all scratches left by the preceding one.
Equipment for Polishing
- The equipment necessary for polishing consists of stones, separating discs, finishing burs, rubber abrasive wheels, small felt wheels, and polishing wheels for pumice, tripoli, and rouge.
Finishing and Polishing Procedure
- After the ring is cool, the investment is removed using an electrical hammer and sandblasting machine with different sizes of Aluminum oxide.
- A separating disc is used to remove sprues, and a perforated disc is used to remove sprue ends on the casting after separation.
- Pliers should never be used to remove partial denture sprues to avoid distorting the framework.
- The casting is picked, and the framework is placed in a pickling solution and heated to remove surface oxides from the metal.
- The polishing steps are completed sequentially over the entire polished surface to prevent repetition of polish.
Stages of Polishing Metal
- The stages of polishing metal include:
- Stoning to remove scratches
- Using a rubber abrasive wheel to smooth the surface
- Using pumice to refine the surface
- Using tripoli to impart a higher polish to the framework
- Using rouge to achieve a high-luster finish
Test your knowledge on the processes of finishing and polishing prosthesis in dentistry. Learn about the importance of these procedures in improving esthetic, function, and oral health. Explore the rules and techniques for achieving smooth and glossy results in dental castings.
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