. The Dental cosmos. ome years ago, reported a case of syphi-litic necrosis, in which one of the antrawas perforated, the entire alveolar pro-cess having been lost and the roof of themouth being almost a plane use of springs in this case seemedinadvisable because all of the lower teethremained intact. A vulcanite plate wasmade with a projection in the buccalregion which avoided the anterior mar-gin of the masseter muscle, and whichfitted into a depression in the cheeklocated above the position of the risoriusmuscle. The patients cheek was some- 928 THE DEXTAL COSMOS. what distended
. The Dental cosmos. ome years ago, reported a case of syphi-litic necrosis, in which one of the antrawas perforated, the entire alveolar pro-cess having been lost and the roof of themouth being almost a plane use of springs in this case seemedinadvisable because all of the lower teethremained intact. A vulcanite plate wasmade with a projection in the buccalregion which avoided the anterior mar-gin of the masseter muscle, and whichfitted into a depression in the cheeklocated above the position of the risoriusmuscle. The patients cheek was some- 928 THE DEXTAL COSMOS. what distended by the appliance, but incourse of time a marked depression wasmade in the muscular structures of thecheek, and the patient learned to main-tain the denture satisfactorily in place. The rim ordinarily used need only beof moderate size. (Fig. 10.) When it isa factor of prime importance it shouldbe pronounced, because this makes itmore efficient, helps to keep the soft tis-sues away from the teeth and prevents Fig. Plates showing three variations in size ofmarginal rim. cheek-biting, though the overhang of theupper buccal cusps should be enough toassist in preventing this. The tongue learns to hold the dentureup, and at the same time to press thefood between the teeth during mastica-tion. It is believed that the roughenedlingual surface existing when rugae aremade upon the denture is of materialassistance to the tongue. Patients also acquire new methods ofmandibular movement, as they soon learnthat certain ones do not displace thedentures. They often begin with thestraight up-and-down motion, simul-taneously crushing similar amounts offood on each side, and later they extendthe mandibular activities to lateral ex- cursions with dentures the articulationof which permits it. All patients should be informed as towhat will be required of them in learn-ing to use a new denture. When physicalretention is poor, they should be toldthat it practically all depends upon theirown effort
Size: 2604px × 960px
Photo credit: © Reading Room 2020 / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1910, bookiddent, booksubjectdentistry
