. The science and practice of dental surgery. made alarge number of measurements of skulls andliving subjects—adults and children. Hewrites : I had been struck by thatthe angle formed by the ascending ramus withthe body of the mandible varied in differentpeople. It is an equally true observation thatthe chief feature of facial abnormality is causedby the position of the mandible being anterioror posterior to its proper position. My objectwas to try and estimate and correlate these twoj)henomena. To estimate the former I tooka point just in front of the antihelix of the ear(corresjjo
. The science and practice of dental surgery. made alarge number of measurements of skulls andliving subjects—adults and children. Hewrites : I had been struck by thatthe angle formed by the ascending ramus withthe body of the mandible varied in differentpeople. It is an equally true observation thatthe chief feature of facial abnormality is causedby the position of the mandible being anterioror posterior to its proper position. My objectwas to try and estimate and correlate these twoj)henomena. To estimate the former I tooka point just in front of the antihelix of the ear(corresjjonding with the mandibular fossa), thepoint where the ramus joins the mandible anda point in the same plane corresponding to thepoint of the chin. This is called the mandibularangle. To estimate the latter I chose the 118 same point in front of the ear, a point inthe same plane corresponding to the base of thenose (these being probably fairly stable cranialpoints), and measured the angle formed bythese with a line drawn from the base of the. be noted particularly that according to hisinvestigations protrusion of the mandible, asjudged by the mandibular and profile angles,sometimes exists without labial occlusion ofthe mandibular incisors. He believes thatmouth-breathmg is by far the most frequentcause of these deformities (see Figs. 198, 199,200). Rushtons measurements are— Normal. Length Length Total length Length of of of oframus, body. mandible. face. Mandi-bularangle. Pro-fileangle ChildrenAdults . 11 3i 4J (130:100)2J 3| 5| (126:100) Retruded Mandible. 3i 12r120° 74°73° ChildrenAdults . If 2J 4i (120:100)2\ 3 54(107:100) Protruded Mandible 3i 4| 129°134° 66°65° ChildrenAdults . lYi 3,V, 5 (119-5:100)2,V 3^ 51(110:100) 4A 132°137° 74°76° He remarks in comiection with them : Thechief points to be noted in the above tables are Fig. 198.—Youth aged 17. Had adenoids and tonsilsremoved a year ago, but still a narrow face; large mandibular angl
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectdentistry, bookyear19
