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Questions and Answers
What is the primary factor affecting alloy selection for dental amalgam?
What is the primary factor affecting alloy selection for dental amalgam?
What is the recommended ratio of alloy to mercury in dental amalgam?
What is the recommended ratio of alloy to mercury in dental amalgam?
What is the consequence of under-trituration of the amalgam mix?
What is the consequence of under-trituration of the amalgam mix?
What is the purpose of condensation in dental amalgam manipulation?
What is the purpose of condensation in dental amalgam manipulation?
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What does burnishing of the amalgam restoration primarily aim to achieve?
What does burnishing of the amalgam restoration primarily aim to achieve?
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Why is it important to overfill the cavity by 1 mm during amalgam placement?
Why is it important to overfill the cavity by 1 mm during amalgam placement?
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What type of margin is indicated if the explorer tip catches between the tooth and amalgam?
What type of margin is indicated if the explorer tip catches between the tooth and amalgam?
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What is the primary goal of finishing and polishing an amalgam restoration?
What is the primary goal of finishing and polishing an amalgam restoration?
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What is the minimum thickness required for an amalgam cavity preparation?
What is the minimum thickness required for an amalgam cavity preparation?
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What is the purpose of the retention form in amalgam restoration?
What is the purpose of the retention form in amalgam restoration?
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Which of the following correctly describes resistance form in amalgam cavity preparation?
Which of the following correctly describes resistance form in amalgam cavity preparation?
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Which principle outlines the requirement of having rounded internal preparation angles?
Which principle outlines the requirement of having rounded internal preparation angles?
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What does the convenience form in cavity preparation aim to achieve?
What does the convenience form in cavity preparation aim to achieve?
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What should be done during the amalgam restoration process to remove defective structures?
What should be done during the amalgam restoration process to remove defective structures?
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What is the function of auxiliary means like locks and coves in amalgam restoration?
What is the function of auxiliary means like locks and coves in amalgam restoration?
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What is the recommended cavosurface margin for an amalgam restoration?
What is the recommended cavosurface margin for an amalgam restoration?
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Study Notes
Operative Dentistry I: Amalgam Restoration and Manipulation II
- Course: Operative dentistry I
- Topic: Amalgam Restoration and Manipulation II
- Instructor: Dr. Luluah K. Alhagas
- Year: 2024
- Institution: Batterjee Medical College
Lecture Objectives
- Identify amalgam cavity preparations
- Identify amalgam manipulations
- Recognize amalgam safety precautions
Dental Amalgam Cavity Preparation
-
Pre-operative Assessment:
- Medical/dental history
- Radiographs (OPG, BW)
- Chief complaint
- Dental screening
Local Anesthesia
- Administered locally for dental procedures
Isolation
- Procedures to isolate the targeted tooth area
Cavity Preparation: General Requirements
- Remove defects (caries, old restorations)
- Extend preparation onto sound enamel
- Establish a 90-degree cavosurface margin
- Maintain a minimum thickness of 1.5-2 mm
- Prepare undercuts
- Include additional features like grooves, slots, pins, and coves
Cavity Preparation: Principles
-
1-Initial tooth preparation depth (pulpal floor depth):
- Central groove depth: 1.5 mm
- DEJ depth: 0.8 mm
-
2-Outline form/Cavosurface margin (90°):
- Establishing a 90-degree angle crucial for bonding and strength
-
3-Retention form (primary):
- Prevents dislodgement by creating dovetailing and channels.
-
3-Retention form (secondary):
- Auxiliary retention methods: locks, coves, pins, and slots
-
4-Resistance form (primary):
- Preserving cusp and marginal ridges
- Preparing pulpal and gingival walls perpendicular to occlusal forces
- Creating rounded internal angles.
- Removing areas of weakened/unsupported tooth structure.
-
4-Resistance form (secondary):
- Auxiliary resistance methods: locks, coves, pins, and slots.
-
5-Convenience form:
- Features that make the procedure easier: extending outline form for caries removal, matrix placement, amalgam insertion, ensuring proximal margins clear from adjacent teeth.
Dental Amalgam Manipulation: Alloy Selection
- Depends on clinical case
- Factors: particle shape, copper content, and zinc content
Dental Amalgam Manipulation: Alloy Proportion
- Desired ratio of alloy to mercury is 1:1
- Proper proportion of mercury essential for homogenous mixture, while insufficient mercury might lead to weak amalgram; excess mercury may cause a weak or flowable mixture.
Dental Amalgam Manipulation: Trituration Proportion
- Mixing mercury with alloy particles to create a coherent, plastic, and homogenous amalgam mass.
Dental Amalgam Manipulation: Under-/Over-Trituration
- Under-trituration insufficient mixing, leading to uncoated particles and a dull, brittle mixture.
- Over-trituration excessive mixing, resulting in a glossy, hard mixture with premature setting
Dental Amalgam Manipulation: Amalgam Carrier
- Tool for placing and condensing amalgam during the procedure.
Dental Amalgam Manipulation: Condensation of Amalgam mix
- Increase adaptation by directing excess mercury to the surface.
- Increases amalgam density by compacting it tightly.
- Increases final amalgam strength
Dental Amalgam Manipulation: Burnishing of Amalgam Restoration
- Remove excess mercury from the surface.
- Guide for amalgam carving.
- Increase adaptation at restoration margins.
Dental Amalgam Manipulation: Carving of Amalgam Restoration
- Restore normal anatomy and contour.
- Increase adaptation at restoration margins.
Dental Amalgam Manipulation: Checking Occlusion
- Important verification for proper fit
- Necessary for optimal chewing function
Dental Amalgam Manipulation: Checking Margins
- Inspecting the amalgam for proper margins (edges) between the restoration and the tooth to ensure no gaps or leakage.
Dental Amalgam Manipulation: Finishing/Polishing of Amalgam Restoration
- Reduce plaque retention, and the potential for tarnish and corrosion with finishing and polishing.
Dental Amalgam Safety Precautions
- Critical step for working with amalgam.
- Proper disposal of contaminated materials; including scraping amalgam off of the table and disposing of used amalgam tools and containers in designated areas.
References
- Sturdevant's Art and Science of Operative Dentistry
- Chapter 13: Introduction to Amalgam Restorations
- Chapter 18: Biomaterials
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Description
This quiz focuses on the principles of amalgam restoration and manipulation in operative dentistry. It covers essential topics such as cavity preparations, techniques for amalgam manipulation, and safety precautions necessary for dental procedures. Perfect for students in Dr. Luluah K. Alhagas's course at Batterjee Medical College.
