A text-book of dental histology and embryology, including laboratory directions . nt of the individual repeatsevolution. In the study of the bone it has been emphasizedthat the connective tissues have been specialized to meetmechanical conditions, and that both ontogenetically andphylogenetically they are formed in response to mechanicalstimuli. The mutations of connective tissue have beendwelt upon, and especially the fact that a bone as an organof support always contains fibrous tissue, and that there isa continual oscillation between formation and destruction,by means of which it is perfect
A text-book of dental histology and embryology, including laboratory directions . nt of the individual repeatsevolution. In the study of the bone it has been emphasizedthat the connective tissues have been specialized to meetmechanical conditions, and that both ontogenetically andphylogenetically they are formed in response to mechanicalstimuli. The mutations of connective tissue have beendwelt upon, and especially the fact that a bone as an organof support always contains fibrous tissue, and that there isa continual oscillation between formation and destruction,by means of which it is perfectly adapted to its mechanicalenvironment. The transformations of bone in bone growthhave been pointed out, and these will be still more carefully RELATION OF THE TEETH TO THE BONE 375 studied in connection with the growth of the bones of theface. Some years ago the author undertook a study of thestructure and growth of the jaws and alveolar process, whichresulted in very important modifications of the conceptionsof the matter as given by standard texts. Tomes describes Fig. 286. Tomes diagram of development of mandible from infant to adult. the process of development as essentially an addition atthe posterior portions of the jaws to make room for thesuccessively developed permanent molars, and illustratesthe process in diagrams (Fig. 286). * The following quotationstates his view: But the main increase in the size of the jaw has been inthe direction of backward elongation; in this, as Kollikerfirst pointed out, the thick articular cartilage plays an 1 Tomes Dental Anatomy, p. 208. 376 THE TEETH AND DEVELOPMENT OF THE FACE important part. The manner in which the jaw is formedmight also be described as wasteful; a very large amount ofbone is formed which is subsequently, at no distant date,removed again by absorption; or we might compare it to amodelling process, in which thick, comparatively shapelessmasses are dabbed on to be trimmed and pared down intoform. To bring it more cle
Size: 1616px × 1546px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1910, booksubjectteeth, bookyear1912
