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CLASSIFICATION OF DENTAL CAVITIES, PREPARATIONS AND RESTORATIONS

CLASSIFICATION OF DENTAL CAVITIES, PREPARATIONS AND RESTORATIONS. UNCLASSIFIED//REL TO NATO/ISAF. Objectives. know the 6 classifications of lesions, preparations and restorations identify the different parts of a cavity preparation (walls, line angles and point angles).

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CLASSIFICATION OF DENTAL CAVITIES, PREPARATIONS AND RESTORATIONS

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  1. CLASSIFICATION OF DENTAL CAVITIES, PREPARATIONS AND RESTORATIONS UNCLASSIFIED//REL TO NATO/ISAF

  2. Objectives • know the 6 classifications of lesions, preparations and restorations • identify the different parts of a cavity preparation (walls, line angles and point angles) AFAMS Dental Advisor Team

  3. CLASSIFICATION OF DENTAL CAVITIES Class 2: • involves proximal surfaces of posterior teeth. Class 3: • involves the proximal surfaces of anterior teeth but not the incisal angles. AFAMS Dental Advisor Team

  4. CLASSIFICATION OF DENTAL CAVITIES Class 4: • involves the proximal surfaces of anterior teeth and the incisal angles. AFAMS Dental Advisor Team

  5. CLASSIFICATION OF DENTAL CAVITIES Class 5: • involves the gingival third of all teeth (excluding pits or fissures). • Root caries are designated as Class 5 lesions. These lesions are frequently seen in the elderly where gum recession has occurred. AFAMS Dental Advisor Team

  6. CLASSIFICATION OF DENTAL CAVITIES Class 6: • involves only incisal edges and cusp tips. AFAMS Dental Advisor Team

  7. CAVITY PREPARATION TERMINOLOGY • A cavity preparation is termed simple if only one surface is involved, compound if two surfaces are involved and complex if a preparation involves three or more surfaces AFAMS Dental Advisor Team

  8. CAVITY PREPARATION TERMINOLOGY • The involved surfaces of the cavity, cavity preparation and restoration are designated by a combination of the letters representing each involved surface: F – facial D – distal I – incisalL – lingual B – buccalM – mesial O – occlusal V – vestibular (has replaced the terms facial and buccal) AFAMS Dental Advisor Team

  9. CAVITY PREPARATION TERMINOLOGY • For example: • interproximal decay involving the mesial and facial surfaces of tooth 11 would be classified as a Class 3 MF or MV. • A restoration involving the mesial, occlusal and distal surfaces of tooth 36 would be classified as a Class 2 MOD. AFAMS Dental Advisor Team

  10. CAVITY PREPARATION TERMINOLOGY • An internal wall is a cavity preparation surface that does not extend to the external tooth surface. There are 2 internal walls. An axial wall is a vertical internal wall overlying the pulp chamber and parallel with the long axis of the tooth. • A pulpal wall is a horizontal internal wall occlusal to the pulp chamber and perpendicular to the long axis of the tooth. AFAMS Dental Advisor Team

  11. CAVITY PREPARATION TERMINOLOGY • An external wall is a cavity preparation surface that extends to the external tooth surface. Such a wall takes the name of the tooth surface that the wall is toward. See next diagram. There are 6 external walls. Illustration indicating external and internal walls. AFAMS Dental Advisor Team

  12. CAVITY PREPARATION TERMINOLOGY • A cavity preparation wall which is reasonably flat and perpendicular to the forces of occlusion that are generally parallel to the long axis of the tooth can be called floors or seats. • Examples are the pulpal and gingival floors. • Such floors are purposefully prepared to provide stabilizing seats for the restoration, distributing the stresses in the tooth-restoration unit. AFAMS Dental Advisor Team

  13. CAVITY PREPARATION TERMINOLOGY • The enamel wall is the portion of a prepared external wall consisting of enamel. • The dentinal wall is the portion of a prepared external wall consisting of dentin. AFAMS Dental Advisor Team

  14. CAVITY PREPARATION TERMINOLOGY • The enamel wall is the portion of a prepared external wall consisting of enamel. • The dentinal wall is the portion of a prepared external wall consisting of dentin. AFAMS Dental Advisor Team

  15. CAVITY PREPARATION TERMINOLOGY • The cavosurface angle is the angle formed by the cavity preparation and the external surface of the tooth. The actual junction of the angle is referred to as the cavosurface margin. AFAMS Dental Advisor Team

  16. CAVITY PREPARATION TERMINOLOGY Cavity preparations showing cavosurface angles (cs); axial wall (a); pulpal wall (p); enamel wall (e); dentinal wall (d); cavosurface margin (m); dentinoenamel junction (j). AFAMS Dental Advisor Team

  17. CAVITY PREPARATION TERMINOLOGY • The junction of two or more cavity preparation surfaces is referred to as an angle. • A line angle is the junction of two cavity preparation surfaces. • An example would be a lingual-pulpal line angle (lp). • A point angle is the junction of three surfaces. • An example would be an axial-lingual-gingival point angle (alg). AFAMS Dental Advisor Team

  18. CAVITY PREPARATION TERMINOLOGY Typical Class 1 cavity preparation for dental amalgam on a maxillary premolar Schematic representation illustrating cavity preparation line angles and point angles. Line angles are: distal-facial (df) distal-pulpal (dp) distal-lingual (dl) facial-pulpal (fp) lingual-pulpal (lp) mesial-lingual (ml) mesial-pulpal (mp) mesial-facial (mf) Point angles are: distal-facial-pulpal (dfp) distal-lingual-pulpal (dlp) mesial-lingual-pulpal (mlp) mesial-facial-pulpal (mfp) Schematic representation illustrating cavity preparation walls: distal (d) facial (f) lingual (l) mesial (m) pulpal (p) AFAMS Dental Advisor Team

  19. CAVITY PREPARATION TERMINOLOGY Schematic representation illustrating cavity preparation line angles and point angles. Line angles are: axial-facial (af) axial-gingival (ag) axial-lingual (al) axial-pulpal (ap) distal-facial (df) distal-pulpal (dp) distal-lingual (dl) facial-gingival (fg) facial-pulpal (fp) lingual-gingival (lg) lingual-pulpal (lp) Point angles are: axial-facial-gingival (afg) axial-facial-pulpal (afp) axial-lingual gingival (alg) axial-lingual-pulpal (alp) distal-facial-pulpal (dfp) distal-lingual-pulpal (dlp) Typical Class 2 mesialocclusal cavity preparation for dental amalgam on a maxillary premolar Schematic representation illustrating cavity preparation walls: axial (a) distal (d) facial of proximal and occlusal portions (f) gingival (g) lingual of proximal and occlusal portions (l) pulpal (p) AFAMS Dental Advisor Team

  20. CAVITY PREPARATION TERMINOLOGY Schematic representation illustrating cavity preparation line angles and point angles. Line angles are: axial-facial (af) axial-gingival (ag) axial-lingual (al) facial-gingival (fg) facial-lingual (fl) lingual-gingival (lg) Point angles are: axial-facial-gingival (afg) axial-lingual gingival (alg) axial-facial-lingual (afl) Class 3 facial approach cavity preparation for composite resin on a maxillary central incisor Schematic representation illustrating cavity preparation walls: axial (a) facial (f) gingival (g) lingual (l) AFAMS Dental Advisor Team

  21. CAVITY PREPARATION TERMINOLOGY Schematic representation illustrating cavity preparation line angles and point angles. Line angles are: axial-gingival (ag) axial-distal (ad) axial-incisal (ai) or axial- occlusal (ao) axial-mesial (am) distal-gingival (dg) distal-incisal (di) or distal- occlusal (do) mesial-gingival (mg) mesial-incisal (mi)or mesialocclusal (mo) Point angles are: axial-distal-gingival (adg) axial-distal-incisal (adi) or axial-distal-occlusal (ado) axial-mesial gingival (amg) axial-mesial-incisal (ami) or axial-mesial-occlusal (amo) Schematic representation illustrating cavity preparation walls: axial (a) distal (d) gingival (g) incisal (I) or occlusal (o) mesial (m) Class 5 cavity preparation AFAMS Dental Advisor Team

  22. CAVITY PREPARATION TERMINOLOGY • It is preferred that occlusalbe used for posterior teeth only and incisalbe used for anterior teeth only AFAMS Dental Advisor Team

  23. سوالات؟ Questions? UNCLASSIFIED//REL TO NATO/ISAF

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