Questions and Answers
What is Ellis Class I?
What characterizes Ellis Class II?
What does Ellis Class III indicate?
What preparation shape is used for a class 4 fracture on tooth #8 or #9?
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How do you create a fracture for #8/9 composite prep class 4?
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What is the internal preparation depth in dentin for class 4?
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What width should the bevel be on the facial part of the prep for class 4?
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How to bevel the gingival margin for class 4?
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Study Notes
Ellis Classification of Fractures
- Ellis Class I: Fracture remains confined to enamel.
- Ellis Class II: Fracture extends into dentin.
- Ellis Class III: Fracture reaches pulp causing pain; typically requires endodontic therapy, such as root canal treatment.
Class 4 Composite Preparation for Teeth #8 or #9
- The preparation shape should correspond to the extent of the fracture.
- Internal retention should be established in the dentin area.
- Continuous bevel marginally at the external cavosurface margin (facial, lingual, incisal, and gingival).
- The outline form for Class 4 preparation involves a diagonal fracture covering at least half of the facial width at the incisal edge.
- Adhere to the original fracture or decay geometry; do not extend preparation beyond fracture.
Creating the Fracture for Class 4 Composite Preparation
- The fracture zone is prepared by removing the discolored area using a tapered diamond bur.
- Ensure the gingival part of the fracture aligns just below the proximal contact.
Internal Preparation in Dentin for Class 4
- Internal preparation should be confined to dentin for enhanced restoration retention.
- Use a #330 pear-shape carbide bur or a #33 1/2 bur, removing dentin to a depth of 1 mm.
- Depth measurement can be done with a perioprobe for accuracy.
Beveling Techniques for Class 4 Preparation
- Begin beveling on the external facial surface using a tapered diamond bur; avoid extending bevel to internal prep.
- Bevel width should be 2 mm on the facial part of preparation; do not attempt gingival margin beveling at this stage.
- Continue the bevel on the lingual surface with a width of 1 mm and include the incisal angles.
Beveling the Gingival Margin
- Protect adjacent teeth using a steel matrix and wedge before beveling the gingival margin.
- Carefully extend the bevel onto the gingival margin after ensuring proper protection.
Class 4 Composite Restoration
- Complete the final prep before bonding the restoration; ensure all previous steps are followed meticulously for optimal results.
- Post-beveling and internal prep adjustments, finalize the restoration technique in accordance with the established guidelines.
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Description
This quiz focuses on the Ellis classification of tooth fractures and the principles of Class 4 composite preparation for teeth #8 or #9. You'll learn about the different classes of fractures and the specific techniques required for effective composite restoration. Test your knowledge on fracture management and dental preparation methods.
