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The technic of oral radiography
Clarence O. Simpson
940
I should like this society to call the attention of the State Boards of the country to the fact that radiodontic work is not sufficiently emphasized in the examinations, and I hope that the influence of this society may be so enlarged that it will impress itself upon every department of dentistry, as radiodontia must precede almost every step taken in progressive and healthful dentistry.
THE TECHNIC OF ORAL RADIOGRAPHY By
DR. CLARENCE
O.
SIMPSON, ST.
Lours, l\Io.
REGIOXS IN DETAIL (Continued)
Mandibular First Molar Region (Continued from pa qc 876.)
Position of Head. Reclined sufficiently for the occlusal plane of the mandihular teeth to be horizontal when the film holder or retaining finger is in place.
Fig. I.-Position of /lIm packet and holder for the mandibular /lrst molar region.
Veriico-horizonial Angle of Projection. Ten degrees below horizontal. Modifications. Fifteen degrees below horizontal where there is a marked buccal inclination of the teeth, or the roots are unusually long. Five degrees below horizontal where there is an abnormal lingual inclination of the teeth, or the roots are exceptionally short.
Technic of Oral Radiography
941
Mesio-distal Angle of Projection. Parallel with the mesial surface of the first molar. Modification. Compensation for a marked malposition of the teeth. Placement of Film Packet. Longer dimension horizontal. Lower mesial corner slightly bent. Film holder attached at the center of the upper side. Place packet to include the first premolar, and extend distally to the length of the packet; occlusally to include the cusps of the teeth in symmetrical relation to "the side of the packet at the angle of projection.
Fig,
2.-Pogition of patient a nd cone fOI'
thc mandibular fltst. molar reglon.
Fig. 3.-Typical views of the mandibular tlrst molar region.
Firm pressure of the teeth on film holder, or first finger of patient '8 opposite hand on the film holder or near the lower mesial earner of packet when the loss of teeth prevents biting on the film holder. ('one. Centered midway the mesial root of the first molar. Spark Gap. 4 to 4~~ inches. lleient ion of Film Packet.
942
Clarence O. Simpson
Exposure. 90 to 120 milliampere seconds at an 18-inch target film distance. Explanatory Description. The mandibular first molar region generally presents the least difficulty of any in an intraoral examination. The plane of the film packet is approximately parallel with that of the teeth, making the angle of projection especially constant. Where conditions permit, the use of film holder eliminates most of the difficulty in placing and retaining the packet. It is desirable to examine the first molar exclusive of the second and third,
Fig. 4.-A case in which conditions permit a view of the second molar in examination of the first molar region, and another in which the second molar is only partially shown.
Fig. 5.-A set of film holders designed by Dr. Raper, which are indicated in the examInation of mandibular molar- regions.
Fig. 6.-0rdlnary wood film holders, the upper surfaces of which have been sawed diagonally to better conform to the bite in examination of the mandibular molar regions.
because the bueco-lingual axes of the three molars are normally not parallel and they cannot be viewed to the best advantage with a common mesio-distal angle of projection. The most satisfactory view of the first molar is obtained by a mesio-distal angle of projection parallel with the mesial surface of the tooth, which discloses the lamina dura, the contour of the proximal surfaces, the pulp chamber, and both roots; This is also the normal view of the premolars which are included, and supplies some information about the second molar by a diagonal view of that tooth.
940
I should like this society to call the attention of the State Boards of the country to the fact that radiodontic work is not sufficiently emphasized in the examinations, and I hope that the influence of this society may be so enlarged that it will impress itself upon every department of dentistry, as radiodontia must precede almost every step taken in progressive and healthful dentistry.
THE TECHNIC OF ORAL RADIOGRAPHY By
DR. CLARENCE
O.
SIMPSON, ST.
Lours, l\Io.
REGIOXS IN DETAIL (Continued)
Mandibular First Molar Region (Continued from pa qc 876.)
Position of Head. Reclined sufficiently for the occlusal plane of the mandihular teeth to be horizontal when the film holder or retaining finger is in place.
Fig. I.-Position of /lIm packet and holder for the mandibular /lrst molar region.
Veriico-horizonial Angle of Projection. Ten degrees below horizontal. Modifications. Fifteen degrees below horizontal where there is a marked buccal inclination of the teeth, or the roots are unusually long. Five degrees below horizontal where there is an abnormal lingual inclination of the teeth, or the roots are exceptionally short.
Technic of Oral Radiography
941
Mesio-distal Angle of Projection. Parallel with the mesial surface of the first molar. Modification. Compensation for a marked malposition of the teeth. Placement of Film Packet. Longer dimension horizontal. Lower mesial corner slightly bent. Film holder attached at the center of the upper side. Place packet to include the first premolar, and extend distally to the length of the packet; occlusally to include the cusps of the teeth in symmetrical relation to "the side of the packet at the angle of projection.
Fig,
2.-Pogition of patient a nd cone fOI'
thc mandibular fltst. molar reglon.
Fig. 3.-Typical views of the mandibular tlrst molar region.
Firm pressure of the teeth on film holder, or first finger of patient '8 opposite hand on the film holder or near the lower mesial earner of packet when the loss of teeth prevents biting on the film holder. ('one. Centered midway the mesial root of the first molar. Spark Gap. 4 to 4~~ inches. lleient ion of Film Packet.
942
Clarence O. Simpson
Exposure. 90 to 120 milliampere seconds at an 18-inch target film distance. Explanatory Description. The mandibular first molar region generally presents the least difficulty of any in an intraoral examination. The plane of the film packet is approximately parallel with that of the teeth, making the angle of projection especially constant. Where conditions permit, the use of film holder eliminates most of the difficulty in placing and retaining the packet. It is desirable to examine the first molar exclusive of the second and third,
Fig. 4.-A case in which conditions permit a view of the second molar in examination of the first molar region, and another in which the second molar is only partially shown.
Fig. 5.-A set of film holders designed by Dr. Raper, which are indicated in the examInation of mandibular molar- regions.
Fig. 6.-0rdlnary wood film holders, the upper surfaces of which have been sawed diagonally to better conform to the bite in examination of the mandibular molar regions.
because the bueco-lingual axes of the three molars are normally not parallel and they cannot be viewed to the best advantage with a common mesio-distal angle of projection. The most satisfactory view of the first molar is obtained by a mesio-distal angle of projection parallel with the mesial surface of the tooth, which discloses the lamina dura, the contour of the proximal surfaces, the pulp chamber, and both roots; This is also the normal view of the premolars which are included, and supplies some information about the second molar by a diagonal view of that tooth.