Principles and practice of operative dentistry . l action, or resistance of the tissue to theencroachment of the disease, and produced by the filling up of the dentinaltubufi with calcific material. Miller, by quantitative analysis, has shown that it contains more calcimnsalts than the surrounding normal dentin. Walkhoff thinks that it is anevidence of vital or formative activity induced by the stimulation of irri-tation, causing the production of an intercellular substance at the surfacef the cells and primarily of their offshoots. It will be noticed, also, as pointed out by Gysi, that the tr
Principles and practice of operative dentistry . l action, or resistance of the tissue to theencroachment of the disease, and produced by the filling up of the dentinaltubufi with calcific material. Miller, by quantitative analysis, has shown that it contains more calcimnsalts than the surrounding normal dentin. Walkhoff thinks that it is anevidence of vital or formative activity induced by the stimulation of irri-tation, causing the production of an intercellular substance at the surfacef the cells and primarily of their offshoots. It will be noticed, also, as pointed out by Gysi, that the transparentzone which lies between the carious dentin and the pulp is continuous 180 OPERATIVE DENTISTRY. with a new formation of dentin—secondary dentin—upon the wall of thepulp-chamber (Fig. 275). Fig. 277. Fig. 278. Fig. 279. S2a Single tubule filled with cocci.(Miller.) 1100:1. 8^ or 1^ 8 \ Single tubule filled with rods. Single tubule showing a mixea(Miller.) 1100 :L infection with a pleomorphous bacterium. (Miller.) 1100:1. Fig. 280. iX. Decayed dentin, showinga mixed Infection with cocciand bacilli. (Miller.) 400:1. Longitudinal section of decayed dentin, showing infection withrod- and thread-forms. (Miller.) a, tubule distended, but wall3still comparatively intact; &, d, tubular walls broken through andthe dentin in a state of complete dissolution ; c, tubules out of 500:1. Buchard thinks these evidences point to the truth of Walkhoffsexplanation of the process, and indicate that the transparent appearanceis the result of vital reaction. r
Size: 1149px × 2175px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1920, booksubjectdentist, bookyear1920
