. Operative and dental anatomy technics; a class-room and laboratory manual for freshmen dental students . T42, 143, 147 and 148). 2. Cavities in the Proximal Surfaces of the Incisors andCuspids not Involving the Angle.—(a) With the hatchets, hoesand chisels, flatten the gingival and axial walls, making adefinite line angle at their junction, (b) Bring the axial,gingival, labial and lingual walls together at two definitepoint angles (labio-gingivo-axial and lingo-gingivo-axial pointangles). (c) Join the labial and lingual walls together at a def-inite point angle at the incisal portion of the
. Operative and dental anatomy technics; a class-room and laboratory manual for freshmen dental students . T42, 143, 147 and 148). 2. Cavities in the Proximal Surfaces of the Incisors andCuspids not Involving the Angle.—(a) With the hatchets, hoesand chisels, flatten the gingival and axial walls, making adefinite line angle at their junction, (b) Bring the axial,gingival, labial and lingual walls together at two definitepoint angles (labio-gingivo-axial and lingo-gingivo-axial pointangles). (c) Join the labial and lingual walls together at a def-inite point angle at the incisal portion of the cavity, the re- io6 PREPARATION OP CAVITIES sultant form being triangular in shape, with three definitepoint angles (Figs. 149^ 150 and 151). 3. Cavities in Proximal Surfaces of Incisors and CuspidsInvolving the Angle.—(a) If the simple mortise form is adoptedthe procedure is practically the same as that described inthe preceding paragraph, consisting in flattening the gingivaland axial walls and joining them at a definite line angle, thegingivo-axial line angle. The resistance form is afforded by. Fig. 149. Fig. 150. Fig. 151. Fig. 149.—Mesial cavity on an upper central incisor showing the flat gingival view. Fig. 150.—Lingual view of the same cavity shown in Fig. 149. Fig. 151.—Cavity shown in Figs. 149 and 150 seen from a different aspect. Thetriangular form with three point angles is noticeable. the flat gingival wall, (b) Incisal step form. After obtainingthe form as described in (a), with a chisel (except in ex-tracted teeth) cut a step about one-half or two-thirds thedistance across the cutting edge of the tooth, exposing theimaginary dentin and removing as little of the labial plateof the imaginary enamel as the tooth will allow. Then,with a hoe, remove the imaginary dentin between the labialand lingual enamel plates, cutting mesio-distally, until a GIVING THE CAVITY FORM 107
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