Questions and Answers
What is a Class V preparation and restoration?
Smooth surface carious lesion located in the gingival 1/3 of F/L or L surface of the tooth.
When is a Class V preparation indicated? (Select all that apply)
What is the occlusal depth of a Class V preparation?
1.5 mm
What is the gingival depth of a Class V preparation?
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Class V preparation requires the outline drawn from _____ to _____ .
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What are the components of an ideal preparation? (Select all that apply)
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What size head does a 330 bur have?
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What is a non-carious cervical lesion (NCCL)?
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What are some causes of abrasion? (Select all that apply)
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What are some factors causing abfraction? (Select all that apply)
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Why should non-carious cervical lesions be addressed?
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Does every Class V NCCL need to be treated?
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What are some choices to restore a carious and non-carious tooth? (Select all that apply)
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What is the head size of a 256 bur?
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Study Notes
Class V Preparation and Restoration Overview
- Class V preparations involve smooth surface carious lesions located on the gingival third of the facial or lingual surfaces of teeth.
Indications for Class V Preparation
- Indicated for caries, erosion, abrasion, recession, and sensitivity.
Preparation Characteristics
- Horizontal cross-section details are crucial in procedural preparation.
Depths of Preparation
- Occlusal depth: 1.5 mm (deeper)
- Gingival depth: 1.25 mm (shallower)
Preparation Directions
- Begin by outlining from line angle to line angle.
- Utilize a number one round carbide bur, holding perpendicular to the buccal/lingual surface.
- Use a pear-shaped carbide bur to extend the outline form to cover the entire carious lesion.
- M-D extension should reach M-D line angles as per clinical caries presence.
- O-G extension determined by criterion in clinical settings.
Ideal Preparation Specifications
- Maintain a 1 mm distance from the free gingival margin.
- Extend prep from line angle to line angle at the intersection of facial and distal/mesial areas.
- Height of preparation should be 2 mm from incisal/occlusal to gingival/cervical margin.
Bur Specifications
- 330 bur: 2 mm head size designed for cavity preparation.
- 256 bur: 3-3.5 mm head size used in restorations.
- 245 bur specifics are not detailed but is crucial for precise cavity shaping.
Non-Carious Cervical Lesions (NCCL)
- NCCLs are characterized by loss of hard dental tissue near the cemento-enamel junction, often presenting as wedge-shaped grooves on buccal surfaces due to abrasion or abfraction.
Causes of Abrasion
- Factors contributing to abrasion include hard brushing, abrasive dentifrices, use of hard-bristled toothbrushes, tobacco chewing, and ill-fitting partial denture clasps.
Abfraction Insights
- Occurs due to occlusal stresses, such as bruxism and clenching, leading to enamel loss.
Importance of Addressing NCCLs
- Primary reasons include preventing dentinal hypersensitivity, caries development, root fractures, pulpal damage, maintaining esthetics, and periodontal health.
Treatment Justification for Class V NCCLs
- Patients' dental histories guide treatment; probing questions regarding symptoms are vital.
- Educate on proper brushing techniques and correct occlusal stresses.
- Preventive measures include desensitizing toothpaste, fluoride treatments, and dentin bonding agents.
Restoration Options for Carious and Non-Carious Teeth
- Anterior restorations: glass ionomer (fluoride-releasing), resin modified glass ionomer, resin composite.
- Posterior restorations: amalgam, gold, glass ionomer, resin modified glass ionomer, resin composite.
Retention and Resistance Forms
- Amalgam and gold materials follow specific retention and resistance form principles.
Additional Restorative Material Considerations
- RDI (Reparative Dental Indication) is essential; ensure shade selection occurs prior to RDI placement and involves the patient.
Suggested Hand Instruments for Preparation
- Perio probe: measures cavity design outline from free gingival margin to the gingival margin of the prep.
- Flat blunt instruments: used to retract gingival tissue during cavity design.
- Wedelstaedt Chisel (15-15-3): utilized for cleaving enamel.
- The 330 pear-shaped bur helps in measuring the height from gingival to occlusal cavo-surface margin effectively.
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Test your knowledge on Class V preparation and restoration techniques with these flashcards. Focus on definitions, indications, and technical aspects vital for understanding dental procedures. Perfect for dental students and professionals alike!
