Questions and Answers
What is a Class II restoration?
Where does a Class II originate?
below the contact point
Lesions that radiographically appear to be ______ or more through enamel have actually penetrated DEJ
2/3
What is CariVu?
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What is another tool you can use to diagnose Class II lesions?
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What is the cavosurface margin?
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What is isthmus in dental cavity preparation?
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What does the dovetail do in cavity preparation?
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Which is more important to restoration longevity?
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What results from a poor cavosurface margin?
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Remove all _________ and provide _______ protection
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What drives the form of prep to ensure that tooth or restoration will not be fractured or displaced during mastication?
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You should remove all demineralized enamel and dentin.
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You should remove enamel not supported by sound dentin.
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What are the initial steps of tooth prep?
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What is meant by outline form in cavity preparation?
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What does resistance form ensure?
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What does retention form prevent?
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What is convenience form in cavity prep?
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What are the final steps of tooth prep?
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What is the composite design dictated by?
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What principles should be considered before beginning the cavity prep?
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What should the angled walls in cavity preparation allow for?
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What is secondary retention form?
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What is the ideal contact location for restorations?
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What are the objectives of matrix and wedge placement?
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Is the mylar strip acceptable for posterior restorations?
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What is a universal matrix used for?
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Should the matrix band extend 1-2 mm coronal to the adjacent tooth?
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Which end of the matrix band is toward the occlusal?
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What does burnishing the matrix band do?
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What does proper wedge adaptation ensure?
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What does the FlexiWedge do?
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Which teeth and surfaces may have a mesial or distal concavity?
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What is the purpose of the Barton Matrix?
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What are common challenges of Class II restorations?
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What are common errors resulting in weak or missing contact?
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What are suggested solutions for common errors in Class II restorations?
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Study Notes
Class II Cavity Design Overview
- Class II restoration targets proximal surfaces of posterior teeth, addressing smooth surface caries and compound restorations.
- Originates beneath the contact point to effectively restore tooth integrity.
Diagnosing Class II Lesions
- Radiographic evidence shows lesions penetrating 2/3 of the enamel before reaching the dentin-enamel junction (DEJ).
- CariVu is a diagnostic tool that uses illuminated imaging to identify caries.
Cavity Preparation Terminology
- Cavosurface margin denotes the junction between prepared and unprepared tooth surfaces.
- Isthmus refers to the narrow area connecting facial and lingual cusps within the cavity prep.
Structural Integrity in Restorations
- The longevity of restorations relies heavily on the amount of remaining tooth structure.
- Poor cavosurface margins lead to unsatisfactory restoration prognoses.
Tooth Preparation Techniques
- Initial steps require outline, resistance, retention, and convenience forms.
- Outline form defines the prep shape, while resistance form comprises factors that prevent tooth and restoration fractures.
- Retention form prevents displacement, and convenience form facilitates restorative ease.
Final Steps in Cavity Prep
- Removal of remaining caries, pulpal protection with liners/bases, and cleaning the cavity are critical final steps before restoration.
Composite Design Principles
- Composite restoration design follows caries extension principles and cavity preparation guidelines.
- Visualize the cavity box's location relative to anatomical features before starting prep.
Resistance and Retention Forms
- Resistance form involves angular orientations and maintaining supporting tissues for upper marginal ridges.
- Primary retention is achieved through converging proximal walls, with dovetails aiding in preventing displacement.
Matrix and Wedge Placement
- Matrix systems mechanically restore proximal contacts and control material extrusion during filling.
- Proper adaptation is crucial; wedges should be positioned to seal gingival floors and allow tooth separation.
Matrix Selection and Techniques
- Universal matrices are used in preparations lacking adjacent teeth or large cavities.
- Specific bands accommodate unique cavity shapes or positions without hindering adjacent tooth contact.
Challenges in Class II Restorations
- Back-to-back restorations and subgingival cavities present difficulties in achieving proper margins.
- Proper technique and material use are essential to prevent weak or missing contacts.
Solutions for Improved Outcomes
- Ensure correct matrix contouring and placement before restoring to prevent post-operative issues.
- Utilize tools and techniques effectively, checking on all apparatus before proceeding with restorative materials.
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Description
This set of flashcards provides a comprehensive overview of Class II cavity design concepts essential for dental restorations. Each card includes terms and definitions related to proximal surfaces of posterior teeth and caries detection. Ideal for dental students looking to enhance their understanding of restorative dentistry.