A practical treatise on the technics and principles of dental orthopedia and prosthetic correction of cleft palate . Side view of upper and lower jaws of a child about twelve orthirteen years of age. 72 PART III. BASIC PRINCIPLES OF PRACTICE half its width, would it not interfere very materially with the second molar bydisturbing its true position—by carrying it backward and turning it over to agreater or less extent? Fig. 17 is from a similar preparation, of a child about twelve or thirteenyears of age. If the first molar had been moved backward half its width, atthe age of seven or eight yea
A practical treatise on the technics and principles of dental orthopedia and prosthetic correction of cleft palate . Side view of upper and lower jaws of a child about twelve orthirteen years of age. 72 PART III. BASIC PRINCIPLES OF PRACTICE half its width, would it not interfere very materially with the second molar bydisturbing its true position—by carrying it backward and turning it over to agreater or less extent? Fig. 17 is from a similar preparation, of a child about twelve or thirteenyears of age. If the first molar had been moved backward half its width, atthe age of seven or eight years, the second molar would have been carried backwith it. This would not have allowed proper space for the third molar, whichwould more than likely have become impacted. Fig. Frcm a radiograph taken from a cleaned specimen of the left side of the lower an impacted third molar. Fig. 18 is a radiograph taken from a cleaned specimen of the left side of thelower jaw showing the teeth in their position with the cancellated tissue. Onemight well imagine that a modern orthodontist had moved the first molar halfits width backward or held it in such a manner that it could not advance. Whetherthis was done by a mechanical appliance or was the result of pathological causes,the tooth was held and impaction resulted. If the cancellated tissue be examined,as seen in the X-ray picture, it will be noticed that it is more dense around the firstand second molars than anteriorly to these teeth. As the result of an inflammatorycondition the cancellated tissue has become united with the cortical bone, thusmaking another factor in preventing its sliding forward. It will be noticed that theroots of the molar teeth are also thickened by the overaction of the cementobl
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Keywords: ., bookcentury1900, bookdecade1920, bookidpracticaltre, bookyear1921
