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Questions and Answers
What are the three types of dental cements classified by the ADA and ISO?
What are the three types of dental cements classified by the ADA and ISO?
- Type II: Restorative materials (correct)
- Type IV: Temporary cements
- Type III: Liners and bases (correct)
- Type I: Luting agents (correct)
What is the purpose of Permanent Cements?
What is the purpose of Permanent Cements?
Used for the long-term cementation of cast restorations.
What is the purpose of Temporary cements?
What is the purpose of Temporary cements?
Allows for the removal of indirect restorations later if needed.
List some variables affecting final cementation.
List some variables affecting final cementation.
The initial setting process may cause the casting not to seat properly if there is a delay between completion of the mix and seating of the __________.
The initial setting process may cause the casting not to seat properly if there is a delay between completion of the mix and seating of the __________.
It is important to dispense the liquid first when mixing dental cements.
It is important to dispense the liquid first when mixing dental cements.
What is essential to do regarding the mixing time for cements?
What is essential to do regarding the mixing time for cements?
What happens if you incorporate too much or too little powder when mixing cement?
What happens if you incorporate too much or too little powder when mixing cement?
Why is it beneficial to cool the glass slab before mixing cement?
Why is it beneficial to cool the glass slab before mixing cement?
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Study Notes
Classification of Dental Cements
- Dental cements are vital materials used with indirect restorations.
- Classified into three types by ADA and ISO:
- Type I: Luting agents for adhering indirect restorations; includes permanent and temporary cements.
- Type II: Used as restorative material, such as Intermediate Restorative Material (IRM).
- Type III: Includes liners and bases used in cavity preparations.
Permanent Cements
- Serve as long-term luting agents for cast restorations like inlays, crowns, bridges, and veneers.
- Stability and appropriate fit are critical during cementation of indirect restorations.
Temporary Cements
- Utilized for temporary cementation when future removal of restorations is anticipated.
- Helpful for managing sensitive teeth or during the waiting period for provisional coverage.
Variables Affecting Final Cementation
- Multiple factors can impact cementation quality, including mixing technique, time, humidity, and slab temperature.
Mixing Time
- Adherence to manufacturer instructions for mixing time and conditions is crucial.
- Delays between mixing and seating can lead to improper casting fit.
Guidelines for Mixing Dental Cements
- Carefully read and follow manufacturer directions prior to mixing.
- Measure powder and liquid according to specific instructions, with powder placed separately from liquid for effective mixing.
- Use incremental mixing: start with smaller increments for better consistency.
Humidity
- Protect cement from premature moisture loss or gain.
- Always dispense powder before liquid to minimize evaporation.
- Avoid pre-setting materials out too early to maintain their quality and effectiveness.
Powder-to-Liquid Ratio
- Accurate powder measurement is essential for proper cement consistency.
- Fluff powder in its container prior to measuring to ensure accurate dosing.
Temperature
- Some cements react chemically at specific temperatures; cooling the mixing slab can aid in proper setting.
- Ensure the slab is dry before mixing to prevent moisture interference.
Types of Cement
- Cements have varied properties and applications, emphasizing versatility in dental practices.
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