Podcast
Questions and Answers
What is the purpose of finishing and polishing in dentistry?
What is the purpose of finishing and polishing in dentistry?
- To add color to the prosthesis
- To increase the weight of the prosthesis
- To decrease the durability of the prosthesis
- To enhance esthetic, function, and oral health (correct)
What is the recommended approach for finishing a casting?
What is the recommended approach for finishing a casting?
- Use contaminated polishing wheels
- Finish in any random order
- Use excessive pressure while cutting
- Follow a definite sequence for finishing (correct)
Why is it important to use high speeds for finishing a casting?
Why is it important to use high speeds for finishing a casting?
- To cause the wheels to clog and glaze
- To make the process less effective
- To increase the danger of the casting being thrown out of hands
- To speed up the cutting process and reduce risks (correct)
What happens if contaminated wheels are used during finishing?
What happens if contaminated wheels are used during finishing?
Why should each finishing operation completely remove scratches left by the preceding one?
Why should each finishing operation completely remove scratches left by the preceding one?
Which equipment is necessary for polishing in dentistry?
Which equipment is necessary for polishing in dentistry?
What is the purpose of using a separating disc in the finishing and polishing procedure for a casting?
What is the purpose of using a separating disc in the finishing and polishing procedure for a casting?
Why should pliers never be used to remove partial denture sprues during the finishing process?
Why should pliers never be used to remove partial denture sprues during the finishing process?
What is the main purpose of pickling in the finishing and polishing process of a metal casting?
What is the main purpose of pickling in the finishing and polishing process of a metal casting?
Why is it essential to use a commercial pickling solution rather than a strong acid in the pickling process?
Why is it essential to use a commercial pickling solution rather than a strong acid in the pickling process?
What is the final step in achieving a high polish on a casting framework according to the text?
What is the final step in achieving a high polish on a casting framework according to the text?
Why are plastic retention areas not subjected to the same finishing steps as the rest of the casting framework?
Why are plastic retention areas not subjected to the same finishing steps as the rest of the casting framework?
Flashcards are hidden until you start studying
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
Studying That Suits You
Use AI to generate personalized quizzes and flashcards to suit your learning preferences.
