1/3. Postmortem pink teeth.A series of cases is reported in which pink teeth were observed during the postmortem period. Most cases were associated with decomposition in a moist environment. Experimental procedures led to the extraction of pink material from dentin and demonstration that hemoglobin and serum proteins were present. The pink-tooth phenomenon was duplicated in human teeth by instilling into the pulp chambers whole blood and blood with the red cells hemolyzed. The change was manifested in teeth of dogs after freezing, heating, and decomposition in a moist environment. The authors postulate that pink teeth occur as a result of breakdown of red blood cells in the pulp chamber of the tooth and diffusion of hemoglobin and other serum proteins into the dentin via the dential tubules. Histochemical studies show that the brown or gray material in some teeth subjected to postmortem aging is probably hemoglobin and serum proteins. Factors of age, vascularity of the pulp chamber, and postmortem conditions are discussed in relation to the postmortem development of pink teeth.- - - - - - - - - - ranking = 1keywords = tooth (Clic here for more details about this article) |
2/3. tooth-based age estimation of an adipocerated cadaver using the amino acid racemization method.We attempted to estimate the age of a completely adipocerated unidentified body using the aspartic acid racemization reaction (racemization method). The material used to make the estimate consisted of two teeth, the right and left lower first premolars, and for comparison five lower first premolars from persons of known age were used. From testing of the specimen teeth, it was estimated that age at the time of death was 39 /- 3 years. Later, the body was identified as that of a woman who had been murdered 6 years before at the age of 41 years, and it was possible to estimate almost precisely her age at the time of death. It was clarified that the dentin racemization reaction hardly proceeds even when the body adipocerates, under conditions in which normal tooth color and hardness are maintained.- - - - - - - - - - ranking = 0.5keywords = tooth (Clic here for more details about this article) |
3/3. Postmortem histologic evaluation of hydroxyapatite-coated cylinder and titanium alloy basket implants in situ for 37 months in the posterior mandible. Dental Implant Clinical research Group.Histologic examination of the tissues surrounding a titanium alloy basket implant and a hydroxyapatite-coated titanium cylinder implant from the mandible of a cadaver were examined. The 67-year-old man died 37 months after first-stage surgery from cardiovascular failure. Clinical and radiographic examinations indicated that the implants were functional, immobile, and integrated. light microscopy revealed that the gingival tissues adjacent to the implants were healthy and, in general, free of inflammatory cells. The transmucosal area demonstrated a tight connective tissue apposition to the implants. The sulcular epithelial appearance was similar to that of a natural tooth. Histomorphometric analysis revealed that 72.2 percent of the basket implant and 75.3 percent of the hydroxyapatite-coated implant were in direct contact with bone. Generally, the bone along the surface of the basket implant was thicker than the bone along the surface of the hydroxyapatite-coated cylinder. Bone grew through the vent hole areas of both implants.- - - - - - - - - - ranking = 0.5keywords = tooth (Clic here for more details about this article) |