Principles and practice of operative dentistry . How cervix clamp. Libby clamp. It is sometimes necessary to slit the edge of the gum above the cavityin order to gain a clear view of the gingival margin and to permit therubber dam to go above it. Cavities occurring in the labial surfaces of the incisors and cuspids aregenerally located either at the cervix or in the frequent imperfections of320 CONSIDERATIONS IN FILLING SPECIAL CLASSES OF CAVITIES. 321 Fig. the enamel, due to developmental defects. As a rule they are shallow, andtherefore need to be given a good retentive form, either by sligh
Principles and practice of operative dentistry . How cervix clamp. Libby clamp. It is sometimes necessary to slit the edge of the gum above the cavityin order to gain a clear view of the gingival margin and to permit therubber dam to go above it. Cavities occurring in the labial surfaces of the incisors and cuspids aregenerally located either at the cervix or in the frequent imperfections of320 CONSIDERATIONS IN FILLING SPECIAL CLASSES OF CAVITIES. 321 Fig. the enamel, due to developmental defects. As a rule they are shallow, andtherefore need to be given a good retentive form, either by slightly en-larging the cavity at the bottom or by forming smallretaining-pits in the extremities. Cohesive foil orcrystal gold are the best for filling this class of cavi-ties. The filling should be started in one of the ex-tremities, care being taken that the first piece of goldis securely anchored and the balance of the fillingbuilt upon this. Many operators finish such fillingswith platinum-gold foil, as the color is less conspicuousthan pure gold. Figs. 402 and 403 show the locationof fillings of this class. Cavities occurring upon the lingual surface of theincisors are generally confined to the laterals, and arethe result of developmental defects, as shown in theimperfect closure of the pit or fissure at the base ofthe cingulum. These cavities are usually small, andare readily filled with a narrow ribbon of non-cohesivefoil and finished with cohesi
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectdentist, bookyear1920
