Dental

CLASS II CAVITIES

¨Due to presence of broad contact area, the gingival floor of the proximal box should be wide

¨The box should converge occlusally with the buccal and lingual wall paralleling the external tooth surface .the walls of proximal box should meet the occlusal wall in a straight line

¨The wall of proximal box should not flared

¨Isthmus should not exceed 1/3^rd of the intercuspal width in primary molars

¨Sharp cavosurface angle

¨Rounded/beveled/grooved/axiopulpal

 line angle to reduce stresses on this point

¨Greater width of the proximal box, more buccolingual extension of the gingival floor

¨Occlusal convergence

¨Axial wall should follow the contour of the external surface

¨Retention growth should not be given

¨Avoid the mesiobuccal pulp horn from exposure in case of small first molar