Caries on occlusal surface of premolars and molars
They are assigned in to three groups. R. on occlusal surface of premolars and molars
R. in foramina coeca - usually on occlusal two thirds of the facial and lingual surfaces of molars.
R.on lingual surface of maxillary incisors.
Access to the cavity from occlusal
surface
• Fissure bur from the middle
Outlines
•  All fissures should be involved - do no oversize - 1/4 dsitance between the bottom of the fissure and the cusp.
•  Oblique ridge    must be preserved if there is not a dental carious.
•  On foramen coecum the poreparation is limited to the size of the carious lesion
Retention
•  Prepare the box - the bottom is situated in dentin
•  Undercuts can be prepared, the proximal ridges must not be weakened!
Resistance
•  Amalgam should be 2 mm thick
•  Enamel must be supported with dentin (be cereful about proximal ridge!)
•  No sharp edges
•  Smooth bottom
Removal of carious, infected, dentin and remaining defective
enamel.
• Spoon excavator or a slowly revolving, round carbid bur of appropriate size.
Finishing and polishing
• Fine grit diamond bur.
Final control
Light, sharp probe, without pressure.