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390 THE TECHNICAL PBOCEDTJBES IN FILi,ING TEETH.

Contact point (continued). Dento-enamel junction, definition, 14.
on mesial surfaces of incisors, may Direct-acting quadrangle plugger points,
build new, closer to gingival than special uses of, 254, 256.
original, 190. Discoid, definition, 20.
Contra-angle, definition, 21. form and use, 42.
Contra-angle hand-piece, description and sharpening, 37.
uses, 48. Discoloration of the substance of the
in distal cavities in upper second molar teeth by amalgam, 313.
and mesial cavities in upper third onlv when filling fails of being water-
molar, 155. tight, 314.
Contra-angles, instruments, 32. Dissolution of cements in oral secretions,
rules for forming, 22. 357.
Contra-angle pluggers, see Plugger points. Distal cavities, definition, 3.
Convenience form, in cavity preparation, in bicuspids and molars, see Proximal
113. cavities in bicuspids and molars,
in deep occlusal cavities in molars, 133. angles of, 10.
in gingival third cavity in buccal sur- walls of, 7.
face of molar, 202. in incisors and cuspids, see Proximal
in labial surface of incisor, 208. cavities in incisors and cuspids,
in large pit cavity in upper first molar, angles of, 12.
127. walls of, 8.
in occlusal cavities in lower molars, Disto-incisal cavities, see Proximal cavi-
137. ties in incisors,
in upper second and third molars. 135. angles of, 13.
in mesial cavity in upper central in- walls of, 8.
cisor, 183. Disto-occlusal cavities, see Proximal cavi-
in mesio-occlusal cavity in lower second ties in bicuspids and molars,
molar, 168. angles of, 11.
in upper first molar, 152, 162. walls of, 7.
in small pit cavity in upper first molar, Divisions of surfaces of teeth, use of, in
123. cavity description, 15.
Convenience points, cutting with bur, 47, Double plane instruments, 31.
152. Drills, measurements of, 24.
cutting with chisel, 153. uses of, 48.
Cotton for separating teeth, 262. Dynamometer for measuring force of
Cross-mouth finger positions, 66. thrusts, or pressure, 239.
Cross sections of proximal cavities and Elasticity of dentin, 224.
fillings, 163. Elasticity of gold, 233.
Crystal gold, 227, 251. Electric annealer, 231.
Curled enamel, 95. Electric crucible for making alloys, 307.
Cuspid teeth, see Incisors and cuspids. Electric mallet for condensing gold, 252.
Cutting holes in the rubber dam, 70. Enamel, attachment of, to dentin, weak-
Cutting instruments, 17. ened in teeth with abrasion, 218.
classification of, 17. caries of, see Caries,
nomenclature of, 17. cementing substance of, 94.
Cutting out grooves with bur, 46. curled, 95.
Cutting steps for anchorage with bur, 45. grooves of, weak lines, 101.
Decrease in finger power among dentists, histological structure of. in relation to
55. cavity preparation, 93.
Density necessary in gold fillings, 236 rods of, 94.
Dental instrument g.augo, 23. how to study directions and inclina-
Dental nomenclature, definition, 2. tions of; 96, 100.
Dentin, area involved in pit and fissure parallel near surface, 95.
decays, 106. statements of directions of in dif-
in smooth-surface decays, 110. ferent parts of the crowns of
Dentin elasticity of, 224. the teeth, 96.
loss of strength of, in teeth with abra- variations in the inclinations of,
sion, 218. from a right angle to the sur-
secondary, built in pulp chamber as face, 97.
result of abrasion, 216. straight, 94.
wall, definition, 14. wall, definition, 14.
walls not cut parallel fur greater wall, finishing of, see Finishing of
strength, 134. cnariiel wall,
Dentists' manudynamometer, 53. white spots in, 101.