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Reflections on extraction cases via diagnostic analyses
630
Reviews and abstracts
Facial
Growth
in Relation
By Anthony
to Chronological
Age
and
to Skeletal
Age
F. Noreschi.
This study is based on the lateral head films and the left-hand films of twenty white girls with normal occlusion, aged 11 to 18 years. The GreulichPyle Atlas was used. On the head films measurements were taken as follows: S-Na, S-Pr, S-Gn, Na-Pr, Na-Cn, Ar-Pr, Ar-Go, and Go-Gn. The data were longitudinal. The measurements which followed skeletal age more closely were S-Na, S-Pr, Na-Pr, Ar-Go, and Go-Gn; those apparently unrelated to skeletal age were S-Gn, Ar-Pr, and Na-Gn. This suggests that upper face depth and height (forming a triangle S-Na-Pr), ramal height (Ar-Go), and carpal length (Go-Gn) are ruled by biologic age; on the other hand, the position of the mandible to cranial base (S-Gn), to face depth (Ar-Pr), and to total face height (No-Gn) is unaffected by biologic age. It should be further pointed out that Xa-Gn contains two alveolar components (maxilla and mandible), each of which is relatively independent of its respective basal structures. Reflections
on Extraction
Cases
Via
Diagnostic
Analyses
By James E. Pumphrey. This is an a posteriori study of eight cases that “treated smoothly” (average age, 12:2, average treat,ment time, 1:8) and nine cases that “treated with difficulty” (average age, 11:4; average treatment time, 3 :4c). The diagnostic devices of Carey, Howes, and Tweed were employed, plus a Northwestern analysis. This paper has as its aim a measure of “insight into a potential basis for success or difficulty in treating certain extraction cases.” The Relation Downs,
of a Sample of 50 Boys With Normal Hellman, Northwestern, Sassouni
By William
H. Ruppert
Occlusion
to Given
Standards:
and John W. Sheffield.
In an over-all appraisal the three analyses (Downs, Northwestern, and Sassouni) were ranked in order as given in terms of agreement with, and insight into, the sample studied. The purely cephalomctric standard of Hellman was deemed a useful adjunct, but definitely subordinate to roentgenographic cephalometry. In the Downs and Northwestern analyses, measurements of the relationship of the skeletal parts of the head and fact were very satisfactory, having normal values in at least 82 per cent of the cases, varying from 82 to 94 per cent. Different results were obtained in relating the dental units to one another and to the skeletal framework. In these measurements, the percentage of normal values ranged from a low of 40 per cent in the case of the angle of the axis of the lower incisor to the occlusal plane in the Downs analysis, to a value of ‘i8 per cent in three of the measurements utilized in the Northwestern analysis. The mean percentages of normal ralucs in tha analysis for the skeletal and dental relationships are as follows:
Reviews and abstracts
Facial
Growth
in Relation
By Anthony
to Chronological
Age
and
to Skeletal
Age
F. Noreschi.
This study is based on the lateral head films and the left-hand films of twenty white girls with normal occlusion, aged 11 to 18 years. The GreulichPyle Atlas was used. On the head films measurements were taken as follows: S-Na, S-Pr, S-Gn, Na-Pr, Na-Cn, Ar-Pr, Ar-Go, and Go-Gn. The data were longitudinal. The measurements which followed skeletal age more closely were S-Na, S-Pr, Na-Pr, Ar-Go, and Go-Gn; those apparently unrelated to skeletal age were S-Gn, Ar-Pr, and Na-Gn. This suggests that upper face depth and height (forming a triangle S-Na-Pr), ramal height (Ar-Go), and carpal length (Go-Gn) are ruled by biologic age; on the other hand, the position of the mandible to cranial base (S-Gn), to face depth (Ar-Pr), and to total face height (No-Gn) is unaffected by biologic age. It should be further pointed out that Xa-Gn contains two alveolar components (maxilla and mandible), each of which is relatively independent of its respective basal structures. Reflections
on Extraction
Cases
Via
Diagnostic
Analyses
By James E. Pumphrey. This is an a posteriori study of eight cases that “treated smoothly” (average age, 12:2, average treat,ment time, 1:8) and nine cases that “treated with difficulty” (average age, 11:4; average treatment time, 3 :4c). The diagnostic devices of Carey, Howes, and Tweed were employed, plus a Northwestern analysis. This paper has as its aim a measure of “insight into a potential basis for success or difficulty in treating certain extraction cases.” The Relation Downs,
of a Sample of 50 Boys With Normal Hellman, Northwestern, Sassouni
By William
H. Ruppert
Occlusion
to Given
Standards:
and John W. Sheffield.
In an over-all appraisal the three analyses (Downs, Northwestern, and Sassouni) were ranked in order as given in terms of agreement with, and insight into, the sample studied. The purely cephalomctric standard of Hellman was deemed a useful adjunct, but definitely subordinate to roentgenographic cephalometry. In the Downs and Northwestern analyses, measurements of the relationship of the skeletal parts of the head and fact were very satisfactory, having normal values in at least 82 per cent of the cases, varying from 82 to 94 per cent. Different results were obtained in relating the dental units to one another and to the skeletal framework. In these measurements, the percentage of normal values ranged from a low of 40 per cent in the case of the angle of the axis of the lower incisor to the occlusal plane in the Downs analysis, to a value of ‘i8 per cent in three of the measurements utilized in the Northwestern analysis. The mean percentages of normal ralucs in tha analysis for the skeletal and dental relationships are as follows: