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Cavity preparation class 1
The document details various cavity preparation designs for molars and premolars, outlining specific locations, indications, and internal anatomy associated with each design. It describes eight different designs based on factors such as the extent of caries and the relationship with surrounding structures. Each design has unique characteristics tailored to specific dental scenarios and decay patterns.
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Cavity preparation class 1
- 1. CLASS 1 CAVITYPREPARATION Placedinpits andfissure lesions thatoccurinoneor moreof theff: a. Occlusalsurfacesof molarsandpremolars b. Occlusal2/3of buccalandlingualsurfaces ofmolars c. Lingualsurfacesof anterior teeth d. Anyother unusuallylocatedpit or fissure involved with decay
- 2. COMMON FEATURES Outline formconsists of smooth curves that avoid occlusal eminenceslikecusps and ridges Uniformdepth of 1.5-2mmfrom CSM Or 0.5-1mm from theDEJ Proximal walls are perpendicularto the pulpal floor or diverge pulpo-occlusaly Proximal walls located 1.6-2mm from the proximal surface Roundinternal lineangles Buccal and lingual walls converge pulpo- occlusally Butt joint or 90˚CSM Proximal walls follow contourof proximal surface Pulpal floor is flat and usually perpendicular to the long axis of the tooth
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- 4. DESIGN 1 Maxillarypremolar “dumb-bell”-shaped Mandibular 1stpremolar Circular,resembling snake eyes Mandibular 1st premolar “dumb-bell”-shaped Mandibular 2ndpremolar Y-shaped Mandibular 1st molar Elongated Mandibular 2ndmolar Elongated Maxillarymolar Elongated Maxillarymolar Mesial “kidney” shaped Distal “heart” shaped LOCATION: Occlusal surfaces of molars & premolars INDICATIONS: •caries penetration into dentin does not exceed 0.5mm-1mm •involvement of enamel or pits and fissures will not widen more than ¼intercuspal distance •good oral hygiene& low caries index •Areas of mouthwith low cariogenic activity
- 5. DESIGN 2 LOCATION: Occlusal surfacesof molars & premolars INDICATIONS: •caries cone in dentin extend 1 mmor more from DEJ •preparation involvement is more than ¼ ICD •as preventive measure inpatients with high plaque &caries index •for teeth with intact cusps Shapes similar to design 1 but thereare more deviations from shapes and less curvedoutlineand greater surface dimensions Margins similar to design 1 but closer to cusp tips and crests of ridges Bucco-lingualcross-section Pulpal floor may have different levels If cavity margins are located in occlusal 1/3of inclined planes of cusps, the buccal and lingualwalls will havetwo planes
- 6. DESIGN 3 LOCATION: Occlusal one-totwo-thirds of facial and lingual surfaces of molars & lingual surfaces of anterior teeth INDICATIONS: •the pit orfissure is decayed •used to eradicate pit or fissure as a prophylactic measure •involved pit is not connected w/ other surface(s) or lesions inthe tooth •for invaginated teeth GENERALSHAPE: rounded, triangular,oblong, etc. INTERNALANATOMY: •All walls are joined together in a seemingly continuous fashion •Axial wall should be flat &makea definite acuteangle with the continuous surroundingwall •If it is not conformingto enamelrod direction, it should bemade intwo planes
- 7. DESIGN 4 LOCATION: Occlusal surfacesof molars and grooved part of their facial/lingual surface INDICATIONS: •caries lesions at facial/lingual pits are connected to the occlusal surface •decay undermines facial/lingual marginal ridges •cariescones confined to the concavity of their grooves •cusps not underminedby backward decay GENERALSHAPE: same with design 1 &2 facial/lingual part -parallelogram INTERNALANATOMY Mesio-distal cross-section Bucco-lingualcross-section
- 8. DESIGN 5 LOCATION: Occlusal andfacial and/or lingual surfaces of molars INDICATIONS: •facial/lingual cusps underminedby backward decay •outline is not conducive to retention of restoration •caries cones in dentin exceed 1 mmfrom DEJ •foundation for cast restoration is needed GENERALSHAPE: same with design 2 facial/lingual part – parallelogram (larger) INTERNALANATOMY Mesio-distal cross-section Bucco-lingualcross-section
- 9. DESIGN 6 LOCATION: Occlusal surfacesof molars &premolars as well as portion of facial, proximal or lingualsurface in theform of a “table” of an entirecusp ora section of a cusp INDICATIONS: •Portions or an entirecusp underminedby backward decay •cariesleaves a cusp with a length-width ratio of 3:1infunctional cuspor 4:1innon-functionalcusp, and thereis no interruption in the continuityof surroundingwalls •caries leaves a cusp with a length-width ratio of 3:1 infunctional cusp or 4:1 innon-functionalcusp, and there is interruption in the continuityof surroundingwalls •marginalridge is crossed by a fissure to facial/lingual embrasures •foundation for a futurecast restoration is needed •Class I occlusal lesion is continuous with a Class VIlesion
- 10. DESIGN 7 LOCATION: Occlusal, facial,and/orlingualsurfacesof molars& premolars INDICATIONS: •class1lesions withextensivecariousinvolvement •Placementof internalboxesin thefloorofpreparationis impossible. •Pin/Post-RetainedRestoration
- 11. DESIGN 8 LOCATION: Occlusal surfacesof molars &premolars, sometimes lingualsurface of anterior teeth INDICATIONS: •for endodontically treated teeth
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