essay 14 - class V cavity prepartion for amalgam and indirect restorations - indications, stages of preparation, retentions

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Last updated 8:37 AM on 5/21/26
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6 Terms

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what is class V prepartion?

  • restoration on gingival third of facial or lingual surfaces of all teeth

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Indications for class V preparations for amalgam and indirect restorations

  • cervical caries in non-aesthetic areas

  • deep gingival lesions where moisture control is difficult

  • abutment teeth for partial dentures (due to wear resistance)

  • root surface lesions requiring strong, durable material

  • Lesions needing long term restorations

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contraindications for class V preparations for amalgam and indirect restorations

  • aesthetically sensitive areas (visible in speech or smiling)

  • Highly demanding aesthetic patients

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stages of class V preparation for amalgam

Initial stage

  1. enter with tapered fissure bur to depth:

— 0.5 mm inside DEJ (enamel)

— 0.75 mm in cementum (root)

  1. follow facial surface curvature → convex axial wall

  2. Margins extended to sound tooth structure

  3. external walls perpendicular to the surface and parallel to enamel rods

Final tooth preparation

  1. Remove infected dentin

  2. apply liner/base only is needed

  3. prepare retention grooves:

— along gingivo axial and inciso axial line angles

— 0.25mm deep, 0.2 mm inside DEJ (or root)

<p>Initial stage </p><ol><li><p>enter with tapered fissure bur to depth:</p></li></ol><p>— 0.5 mm inside DEJ (enamel)</p><p>— 0.75 mm in cementum (root)</p><ol start="2"><li><p>follow facial surface curvature → convex axial wall </p></li><li><p>Margins extended to sound tooth structure </p></li><li><p>external walls perpendicular to the surface and parallel to enamel rods </p></li></ol><p></p><p>Final tooth preparation </p><ol start="5"><li><p>Remove infected dentin </p></li><li><p>apply liner/base only is needed </p></li><li><p>prepare retention grooves:</p></li></ol><p>— along gingivo axial and inciso axial line angles </p><p>— 0.25mm deep, 0.2 mm inside DEJ (or root)</p><p></p>
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retention features for class V preparations for amalgam

  • macromechanical retention (retention grooves) + (occlusal wall is given a slight undercut toward the axial wall. helps resist dislodgement toward the occlusal direction)

  • requires gingival and incisal grooves

  • diverging external walls → grooves are essential

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Class V preparations for indirect restorations (e.g lab-made inlays/onlays)

  • similar to prep as amalgam but often more conservative

  • Indicated for extensive lesions, aesthetic demands or when a composite restoration failed

  • Requires 90 degree butt joints, rounded internal line angles, and passive insertion path

  • Retention is bonding-based, sometimes reinforced with box form or slots