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The effects of the tooth positioner on the oral mechanism following orthodontic treatment
630
Abstracts
and
Am. J. Orthodontics August 1962
,reviews
5. The angular analysis of the apex of the lower central incisor showed a similarity between Class 1 and Class II, Division 1. However, the linear analysis indicated that the a.pex in the Class IT, Division 1 sample was farther from B t.han in the Class I sample. This indicated that the mandibular central incisor was more upright in Class I than in Class II, Division 1 occlusion. 3604
Bryan.,
Texas
d’rc.
Texas
The Effects of the Tooth Treatment
Positioner
Uy Thomas M. Hotden,
on the Oral
Mechanism
Following
B.X., D.D.S., LU.S., Xt. Louis University,
Orthodontic
St. Louis,
Missouri
This study was made to evaluate cephalometrically the changes that have occurred in extraction cases where retention has been maintained by the Hawley appliance and the tooth positioner appliances. The Hawley appliance was used in the control group, and the positioner was used in the experimental group. Thirty-two children were selected. The control and experimental groups each consisted of sixteen subjects. Seven children of the control group had Class I malocclusions, and nine had Class II malocclusions. Five of the exmmental group had Class I malocclusions, and eleven had Class II malocclusions. Lateral cephalometric roentgenograms were obtained on each of the patients, both at the time of appliance removal and six to nine months after placement of the retaining appliance. The skeletal and dental changes of both groups from the first to the last roentgenogram were observed and compared by the use of the following landmarks : Sella turcica Pogonion Nasion Mechanical porion Orbitale Gonion Subspinale (point A) Maxillary central incisor Mandibular central incisor Supramentale (point B) Gnathion Mandibular first molar From these landmarks five linear and five angular measurements were obtained. The reliability of the measurements was checked by testing the significance of the difference in two sets of tracings made on the same patients. A statistical analysis of the data involved Student’s “t” test of the significance of the difference of means of small samples. The findings were as follows : 1. No significant difference existed between the groups with regard to type of appliance. 2. No significant difference existed between the classes of occlusion. 3. No significant difference existed between the two independent sets of tracings on the same patients. 3967 Pairview St. Louis, MO.
Ave.
Abstracts
and
Am. J. Orthodontics August 1962
,reviews
5. The angular analysis of the apex of the lower central incisor showed a similarity between Class 1 and Class II, Division 1. However, the linear analysis indicated that the a.pex in the Class IT, Division 1 sample was farther from B t.han in the Class I sample. This indicated that the mandibular central incisor was more upright in Class I than in Class II, Division 1 occlusion. 3604
Bryan.,
Texas
d’rc.
Texas
The Effects of the Tooth Treatment
Positioner
Uy Thomas M. Hotden,
on the Oral
Mechanism
Following
B.X., D.D.S., LU.S., Xt. Louis University,
Orthodontic
St. Louis,
Missouri
This study was made to evaluate cephalometrically the changes that have occurred in extraction cases where retention has been maintained by the Hawley appliance and the tooth positioner appliances. The Hawley appliance was used in the control group, and the positioner was used in the experimental group. Thirty-two children were selected. The control and experimental groups each consisted of sixteen subjects. Seven children of the control group had Class I malocclusions, and nine had Class II malocclusions. Five of the exmmental group had Class I malocclusions, and eleven had Class II malocclusions. Lateral cephalometric roentgenograms were obtained on each of the patients, both at the time of appliance removal and six to nine months after placement of the retaining appliance. The skeletal and dental changes of both groups from the first to the last roentgenogram were observed and compared by the use of the following landmarks : Sella turcica Pogonion Nasion Mechanical porion Orbitale Gonion Subspinale (point A) Maxillary central incisor Mandibular central incisor Supramentale (point B) Gnathion Mandibular first molar From these landmarks five linear and five angular measurements were obtained. The reliability of the measurements was checked by testing the significance of the difference in two sets of tracings made on the same patients. A statistical analysis of the data involved Student’s “t” test of the significance of the difference of means of small samples. The findings were as follows : 1. No significant difference existed between the groups with regard to type of appliance. 2. No significant difference existed between the classes of occlusion. 3. No significant difference existed between the two independent sets of tracings on the same patients. 3967 Pairview St. Louis, MO.
Ave.