Class III Cavity Preparation Flashcards
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Questions and Answers

What is Class III lesions?

Proximal surface of anterior teeth, usually incisor and canines, smooth surface anterior only, point of origin is gingival to contact but can grow beyond.

What does Class III lesions not involve?

Does not involve an incisal angle like mesial incisal or distal incisal, no pits or grooves.

What would you do if the caries lesion involves an incisal edge?

Change classification.

Class III preparation is used with what type of material?

<p>Composite, gold foil, amalgam.</p> Signup and view all the answers

What instrument can you use to detect the caries lesion?

<p>Radiograph, explorer, transillumination.</p> Signup and view all the answers

What are some Class III carious lesions?

<p>#7 mesial, #8 distal; #9 distal, #10 mesial.</p> Signup and view all the answers

What are some classifications for Class III lesions?

<p>Structures involved; by access (location).</p> Signup and view all the answers

What are the types of Class III lesions by tooth structure involved?

<p>Enamel only, enamel &amp; dentin, enamel, dentin, and cementum.</p> Signup and view all the answers

What are the 3 types of Class III lesions by access?

<p>Type 1: Facial no lingual; Type 2: Lingual no facial; Type 3: Through &amp; through.</p> Signup and view all the answers

What shape does the prep make when viewed from the proximal view and from lingual view?

<p>C-shape.</p> Signup and view all the answers

What is incipient enamel caries?

<p>V-shaped, not cavitated, often dormant, enamel lesion only.</p> Signup and view all the answers

What is cavitated enamel caries?

<p>Past point of remineralization.</p> Signup and view all the answers

What is the definition of cavitation?

<p>Critical event, marking the transition from plaque/acid induced loss of subsurface mineral.</p> Signup and view all the answers

What kind of prep do you use?

<p>Conservative.</p> Signup and view all the answers

What kind of bur would you use?

<p>#2 round bur (diamond or carbide).</p> Signup and view all the answers

Composite restoration requires mechanical retention.

<p>False</p> Signup and view all the answers

What is the depth, location, and outline form of a Class III prep?

<p>Depth: shallow; Location: slightly gingival to interproximal contact; Outline: C-shape with round line angles.</p> Signup and view all the answers

What are enamel and dentin lesions?

<p>Peripheral enamel margins, caries spread to DEJ, axial wall extends into dentin.</p> Signup and view all the answers

What technique would you use for root surface caries with no gingival enamel for bonding?

<p>Open sandwich technique with modified glass ionomer and composite.</p> Signup and view all the answers

What are some initial prep steps?

<p>Pumice the tooth, select appropriate shade, rubber dam.</p> Signup and view all the answers

Cotton roll isolation is an effective way to isolate.

<p>False</p> Signup and view all the answers

How would you create an outline form?

<p>Initial entry with #2 small round bur; maintain contact with adjacent tooth.</p> Signup and view all the answers

What is the depth of the prep?

<p>1.25 to 1.5 mm, uniform width at gingival floor.</p> Signup and view all the answers

How do you want the facial margin on the prep?

<p>Facial margin slightly visible from the facial, axial wall flat or slight convex.</p> Signup and view all the answers

What is the purpose of the caries outline?

<p>Caries removal with #2 rounding bur entering through the ML line angle.</p> Signup and view all the answers

What is beveling the margins?

<p>All enamel margins are beveled at a 45 degree angle or greater.</p> Signup and view all the answers

What is the purpose of beveling the enamel?

<p>To remove unsupported enamel rods and provide a smooth transition.</p> Signup and view all the answers

Do you bevel thin enamel?

<p>False</p> Signup and view all the answers

Historically, what are some restorative materials for Class III?

<p>Gold foil, amalgam, silicate cement, composite.</p> Signup and view all the answers

Restoration of silver amalgam vs. silicate cement vs. composite vs. gold foil.

<p>Amalgam has longer service life compared to silicate or composite.</p> Signup and view all the answers

Where do you primarily use amalgams on Class III?

<p>Distal surface of maxillary and mandibular canines, proximal surfaces of mandibular incisors.</p> Signup and view all the answers

Study Notes

Class III Lesions Overview

  • Class III lesions affect the proximal surfaces of anterior teeth, specifically incisors and canines.
  • These lesions remain as smooth surfaces and originate gingival to the contact point, potentially extending beyond.

Characteristics of Class III Lesions

  • Do not involve an incisal angle, distinguishing them from mesial-occlusal (MO) or distal-occlusal (DO) cavities.
  • Utilize composite, gold foil, or amalgam for Class III preparations.

Diagnosing Lesions

  • Detection methods include radiographs, explorers, and transillumination using light.
  • Prominent examples of Class III carious lesions include those on teeth #7 (mesial) and #8 (distal), as well as #9 (distal) and #10 (mesial).

Classification of Lesions

  • Class III lesions can be classified based on the structure involved (enamel only, enamel & dentin, enamel, dentin & cementum) and access type (facial only, lingual only, or through & through).

Preparation and Technique

  • The outline form is C-shaped when viewed from both proximal and lingual perspectives.
  • Incipient caries are V-shaped, non-cavitated, typically dormant, and limited to enamel.
  • Cavitated caries indicate irreversible damage, marked by shallow cavities that may not be aesthetically pleasing.

Cavitation and Treatment

  • Cavitation signals a critical transition where plaque-induced mineral loss allows bacteria to invade deeper tooth structures.
  • Conservative prep techniques focus on preserving healthy tooth structure, primarily using composite material.

Instruments and Initial Steps

  • Recommended tools for preparation include a #2 round bur (diamond or carbide) and appropriate isolation methods such as a rubber dam.
  • Preparation depth should be uniform, measuring 1.25 to 1.5 mm wide, maintaining at least 0.5 mm clearance from adjacent teeth.

Margins and Beveling

  • The facial margin should be slightly visible, with the axial wall being flat or slightly convex.
  • Beveling enamel margins at a 45-degree angle promotes aesthetic bonding and ensures the removal of unsupported enamel, but thin enamel should remain unbeveled to avoid exposing dentin.

Historical Materials and Applications

  • Historically used restorative materials include gold foil, amalgam, silicate cement, and composite, each with unique advantages and limitations in longevity and aesthetics.
  • Amalgams are primarily applied to the distal surfaces of canines and the proximal surfaces of mandibular incisors, remaining advantageous due to poor bonding surfaces.

Key Considerations for Restoration

  • Restoration selection should prioritize functionality and aesthetic considerations, factoring in service longevity and bonding strength peculiarities of each material used.

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Test your knowledge of Class III cavity preparations with these flashcards. Each card covers essential definitions and concepts related to Class III lesions, including their characteristics and treatment considerations. Perfect for dental students and professionals looking to refresh their knowledge.

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