. The Dental cosmos. nd theinterlocking system of the cusps has be-come disarranged, besides not giving thepatient the full efficiency anatomically andphysiologically for which they were de-signed, they present difficulties to theporcelain worker, chiefly in regard tothe direction of the forces to which hiswork is subjected during 11 shows a case sent to me becauseit was impossible to retain porcelaininlays in the anterior teeth. The patientwould not have gold fillings, so his teethwere filled with a silicate cement, which,on account of the large extent of thecavities occlusal
. The Dental cosmos. nd theinterlocking system of the cusps has be-come disarranged, besides not giving thepatient the full efficiency anatomically andphysiologically for which they were de-signed, they present difficulties to theporcelain worker, chiefly in regard tothe direction of the forces to which hiswork is subjected during 11 shows a case sent to me becauseit was impossible to retain porcelaininlays in the anterior teeth. The patientwould not have gold fillings, so his teethwere filled with a silicate cement, which,on account of the large extent of thecavities occlusallv and because these fill-ings had broken away several times, hadbeen rounded down at the mesio- anddisto-incisal angles, giving a very un-satisfactory appearance. The lower an-terior teeth struck the upper ones allthe way up the lingual surface, com- B their antagonists cusp against cusp, sothat food particles during masticationwould tend to tilt the fillings outwardinstead of directing the pressure against Fig. the slopes of the approximal planes ofocclusion. Fig. 12 shows the articulationcorrected as far as practicable in a pa-tient of thirty-eight or forty years of MOFFITT. NOTES ON PORCELAIN WORK. 687 age, and the desired results accomplishedas to permanent retention of the porce-lain, besides giving anatomically a betterfacial contour and physiologically greaterefficiency of the organs of mastication. Sterilization of the dentin. In thesterilization of the dentinal tubules, Avefind a use for the now almost discardedcreasote. It will, under pressure withgutta-percha properly applied in a pre-viously dried cavity, destroy the micro-organisms that may have penetratedbeyond the visible extent of caries orpossible extent of excavation, so that intwenty-four hours time no culture canbe obtained from cuttings from thebottom of the cavity, though with themicroscope innumerable dead micro-or-ganisms are seen in the same cuttings. the rubber dam must be employed tosecure dryne
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