Potential micrognathia in children with juvenile rheumatoid arthritis

acceptable substitute for the lateral incisor. However, the lateral incisor is not an adequate substitute for the central incisor. .I. A. Sulzrnotltl

Straight v. Multilooped A Comparison Study

Archwires

in Stage I of Begg Therapy:

WI. M. Kuftinec and G. 0. lnman J. &WI.

Rem SK: 401,

J;IIIN(II-I.,

I979

Because of the undesirable side effects of multilooped mandibular arch wires in the early stages of Begg therapy, a study was designed to compare the clinical results of treating two groups consisting of sixteen patients each, closely matched with respect to age, sex, severity of malocclusion, and particularly severity of the anterior mandibular crowding. Group A was treated according to the classically prescribed Begg therapy. The other group’s treatment was modified to the extent that the mandibular arch was not looped, but only straight arch wires were used. The comparison. based on the cephalometric evaluation at the end of Stage I and on comparison of treatment times. demonstrated that, on the basis of the results of this study, it would appear that the use of straight rather than multilooped arch wires in the mandibular arch deserves favorable consideration in early Begg therapy. J. A. Sulzmunn

Potential

Micrognathia

in Children

With Juvenile

Rheumatoid

Arthritis

Lars Odenrick Trcm.

Eut-. Orthod.

So<,.. pp.

207-Z/5.

I977

A comparative study was made of the development of the facial skeleton in 106 children with juvenile rheumatoid arthritis and in 913 healthy children, their ages ranging from 3 to 16 years. Among the children with polyarticular joint involvement, a significant correlation was noted between age at onset, duration of the disease. and mandibular development. The over-all frequency of micrognathia was 26 percent, all but one belonging to the group with polyarticular joint involvement. J. A. Sd~mann

Zur Atiologie Chr. Schulze Fort.whr.

der Progenie

Kiqfirorthopcdic~

40; 87-104,

(On the Etiology April,

of Prognathism)

I979

Four points are discussed regarding the etiology of prognathism, especially hereditary sequences. In the deciduous dentition it is found in about 3 percent and in the permanent dentition about 6 percent when clear-cut cases are considered. A concordance ratio in twins which is less than 4: I does not support the simple dominant pattern; the ratio below 1 : 1 does not support the homozygotic gene activity but suggests a polygenic (multifactorial) inheritance. The ratio of about 7: 1 in prognathism, therefore, favors the polygenic