Sutural growth; investigations on the growth mechanism of the coronal suture and its relation to cranial growth in the rat

88

Amer.

Reviews and abstracts

J. Orthodo%t. July 1970

Stark, the editor of this volume, contributes chapters on congenital defects, secondary lip repair, initial and secondary cleft palate repair, and repair of alveolar clefts. Stark submits that they have had only limited experience with bone grafting at St. Luke’s Clinic. Nevertheless, he proceeds to downgrade the value of bone grafts in treat.ing c,lefts of the oral cavity. The book contains four and one half pages of text, without illustrations, on orthodontics and three pages of text and two pages of poorly devised illustrations on prosthetics. The value of this text lies largely in its historical description of orofacial clefts, speech pathology, classification of clefts, and the development of classic surgical technique for the elimination of clefts. J. A. Sabmann

Sutural Growth; Investigations Suture and Its Relation to Cranial Door-Birte 1968,

on the Growth

Growth Mechanism in the Rat

of the

Coronal

Prahl-Andersen

Offsetdrukckerij

van

Mameren-Nijmegen

The object of this study was to investigate the growth in the cranial sutures, to establish, by analysis, its contribution to the growth of the cranial vault, and to investigate the question of whether the growth at the sutures has to be regarded as autonomous or as primarily depending on other factors. The examination of the normal control material revealed that the coronal sutural area is an important growth site. From the fourth to the eleventh days of age, an overlapping of the bones is observed and the original bone areas are separated by newly formed bone. The size of the individual bones increases predominantly by growth at the sutures, and the thickening takes place by apposition of bone on both the endo- and ectocranial surfaces. The curvature of the individual bones decreases. The cause of this phenomenon is indicated. The fibrous connection between the parietal and the frontal bones divides the sutural region into two growth sites around the bone edges. The direction of the fibers-from anterior externally to posterior internally-suggests that pressure, and not tension, is transmitted in the brain capsule after the connection has been established. In implantation experiments, it was observed that during the implantation period osteogenesis takes place without a corresponding separation of the bone fragments. This is accounted for by pointing out that the fibers in the suture are responsible for the separation. On the basis of the findings described, a governing influence of the brain on the sutural growth was rejected and the concept of the “architectural cranial vault structure” was developed. According to this concept, pressure and not tension is transmitted in the cranial vault. To study what happens when the stresses in the brain capsule are changed and to test the concept of the “architectural cranial vault structure,” experiments with induced microcephaly and hydrocephaly were set up. The former revealed that the morphology of the coronal suture in the microcephalic rats

Reviews

abstracts

and

89

deviated only slightly from that in t,he control rats. The apposition of bone is very much the same, and no change was found in the size of the heads. This led to the conclusion that the brain probably has a supporting function only and has only a limited influence, if any, on the growth potency of the sutural area. The increase in overlapping of the bones was interpreted as giving support to the concept of the “architectur;~l cranial valllt struct,ure.”

Children’s H.

Dentistry

Orthodontics

Brouwer

Amsterdam,

ma

and

1968, Wetenschappelyke of illustrations

7 pages

Uitgevery

X.

P. lid

pages,

9 line

drawings,

This pocket-sized book on orthodontics and children’s dentistry is written for the lay public, particularly parents, and, as such, it deserves special mention. The need for better information, understanding, and appreciation concerning orthodontics has been belabored repeatedly. Y&t, apart from a few sketchy pamphlets, no adequate source is available to learn what orthodontics really involves. The series on Modern Medical Insights has wisely included this monograph, so that facts are readily accessible, at least in the Netherlands. The author gives a fairly comprehensive account of orthodontic examination, diagnosis, and treatment (including a chapter on treatment of adults), as well as stability of results. Dental development, is reviewed in four chapters by age levels and is related to treatment. The first two chapters deal with general information on the dentition and dental care for the young. The indications for orthodontic therapy are discussed with great wisdom. The discussion of children’s dentistry is rather brief. The cxecllent work of the Netherlands Ivory Cross Society is mentioned, hut the author might as well have. included their up-to-date account of the etiology of dental caries for better understanding of preventive dietary measures. Fixed appliances (Bcgg therapy) receive major emphasis, which may be awful for the education of parents, especially in countries whcrc fixed appliances it1*ebeing used with less frequency than removable appliances. The book is well prepared and illustrated. It, stands as an cxamplc for other c~ountries to follow. because the lam1 of the tulip has ;I I~lll~lli~.~~> riot, rcatlily untlcrstood by people of other tongues. i’f,f

Manual

of

Orthodontics.

Mixed

Dentition

Giorgio Bologna,

Mai, in collaboration 1968, Cara E&rice

Vol.

Prof.

2.

Diagnosis

and

t, twr,l

Treatment

F’

in

i

T/0(,1.?‘/

cs

the

with S. Bassoni and F. P. Lucchere Riccardo Patron. $10 pages, %llustratcd

In this volume of X~,~u.al of Orfhodonfic.s, 3Iaj presents his thoughts and actual procedures in the treatment of the mixed dentition. Xaj presents