Abrasion And Polishing Question And Answers

Abrasion And Polishing

Question 1. Write a short note on polishing agents.
Answer:

It produces a smooth mirror-like surface without much loss of any external form.

Types of Polishing:

1. Abrasive
2. Nonabrasive.

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1. Abrasive Polishing:

If the particle size of an abrasive is reduced sufficiently, the surfaces become, extremely fragile and may disappear entirely. The surface then acquires a smooth shiny layer known as a polish.  The polishing agent removes material from the surface molecule by molecule. The microcrystalline layer is referred to as the polish layer or “Beilby layer”

Polishing Agents:

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2. Nonabrasive Polishing These include:

• Composite glazing: A layer of glaze or glass (a clear transparent liquid made of unfiled resin) is applied over the restoration and cured. This results in a smooth highly glossy surface.
• Glazing ceramics: The finished restoration is subjected to high temperature. At this temperature, the surface layer melts and flows to produce a smooth glass-like surface.
• Electrolytic polishing: In electrolytic polishing, the material is removed through an electrochemical process.
• Burnishing: It is related to polishing in that the surface is drawn or moved. Instead of using many tiny particles, only one large point is used.