. Dental n the reading matter published by THE DENTAL SUMMARY. 420 Ill 10 DJONTAL SUMMARY GINGIVAL CAVITIES. Gingival cavities should be extended only to include allthe decayed area. In doing this, endeavor to get an ovalor kidney-shaped cavity as it is extremely difficult to properlyinsert an inlay of circular outline. This extension is bestaccomplished by the use of chisels and inverted cone this class of cavities there are frequently several smallpits on initial seats of decay. These are best united by theuse of small inverted cone burs. Then with chisels breakdown the ove
. Dental n the reading matter published by THE DENTAL SUMMARY. 420 Ill 10 DJONTAL SUMMARY GINGIVAL CAVITIES. Gingival cavities should be extended only to include allthe decayed area. In doing this, endeavor to get an ovalor kidney-shaped cavity as it is extremely difficult to properlyinsert an inlay of circular outline. This extension is bestaccomplished by the use of chisels and inverted cone this class of cavities there are frequently several smallpits on initial seats of decay. These are best united by theuse of small inverted cone burs. Then with chisels breakdown the overhanging enamel walls. This operation shouldbe repeated, first using the inverted cone burs (increasing thesize each time), then the chisels until the cavity is extendedto sound margins and symmetrical outline. After the desiredoutline is reached any undercuts that may be present -shouldbe cut away and the walls made parallel by the use ofsquare-end fissure burs, or better still, a similar-shapedplug finishing Fig. 1 Fie 2 Fig. 3 It is in these cavities we experience so much difficultyin securing a proper color, especially after the inlay has beencemented to place. Consequently great care should beexercised in getting the proper alignment of the margins,also proper deptfh to the cavity. This being an extremelysensitive portion of the tooth many inlays are failures owingto a lack in depth sufficient to give enough bulk to theporcelain to exclude the influence of the cement, sayingnothing of the strength of the inlay. THE DENTAL SUMMARY 421 Many will criticise the use of the parallel walls, citingthe difficulty of burnishing a matrix to a cavity of this objection you will find entirely done away with in themethods suggested later for forming the matrix for this classof cavities. The main objections to flaring walls are the lackof retention and the objectionable change of color in theinlay from cement. The nearer you can get this cement wallparallel to the line o
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