A text-book of dental histology and embryology, including laboratory directions . The region of the carious spot shown in Fig. 107, showing the disintegrated areaof the enamel and the action of acid on the dentine. (About 30 x) AREAS OF WEAKNESS FOR ENAMEL MARGINS 141 Fig. 110. The enamel over the mesial marginal ridge to the oblique groove, showing a regionof weakness for the occlusal wall of a simple proximal cavity. 142 AREAS OF WEAKNESS FOR ENAMEL MARGINS The surface of the enamel from the point directly over thedentine cusp or ridge to the tip of the enamel cusp or ridge,which is an area
A text-book of dental histology and embryology, including laboratory directions . The region of the carious spot shown in Fig. 107, showing the disintegrated areaof the enamel and the action of acid on the dentine. (About 30 x) AREAS OF WEAKNESS FOR ENAMEL MARGINS 141 Fig. 110. The enamel over the mesial marginal ridge to the oblique groove, showing a regionof weakness for the occlusal wall of a simple proximal cavity. 142 AREAS OF WEAKNESS FOR ENAMEL MARGINS The surface of the enamel from the point directly over thedentine cusp or ridge to the tip of the enamel cusp or ridge,which is an area of great strength in the perfect crown, is aregion of weakness for an enamel wall. It is fully as impor-tant not to extend into this area unnecessarily as to formthe wall properly when caries has extended so as to involveit. And when caries of a smooth surface approaches a mar-ginal ridge which receives the force of occlusion, the wallmust be extended so that the enamel receives full supportfrom sound dentine. CHAPTER XII THE EFFECT OF CARIES ON THE STRUCTURE OF THE ENAMEL The action of acid upon the enamel has been fully con-sidered in Chapter VIII, and it should be carefully studiedbefore considering the effect of caries on the structure ofthe enamel, for this cannot
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectteeth, bookyear1912
