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Biomedical subjects

I Brin

Publications and source records attributed to I Brin.

At least 37 records · Page 2Linked to original sources
PubMed1991

The influence of orthodontic treatment on previously traumatized permanent incisors.

The reaction of previously traumatized teeth to orthodontic force application was investigated. Four groups of children were examined: group T comprised 56 children who encountered trauma to their maxillary incisors; group O comprised 29 orthodontic patients with intact incisors; group TO comprised 28 previously traumatized orthodontic patients; and group C served as the control group (n = 26). Orthodontic treatment was restricted to tipping movement executed only by means of removable appliances. Groups T, O, and TO were followed up longitudinally by means of clinical and radiographic examinations. In most of the cases the reported trauma occurred to teeth with completed roots and affected the crown only. Group TO presented the highest, though relatively moderate, prevalence of root resorption (27.8 per cent) and was followed by groups O and T (6.7 and 7.8 per cent, respectively) while in the control group no resorption was observed. Electrical pulp testing revealed the highest prevalence of loss of tooth vitality in group TO (7.3 per cent) in which the highest prevalence of pulp obliteration was also found. It can be concluded that the combination of trauma with orthodontic tipping renders the teeth more susceptible to complications, especially to root resorption and loss of vitality.

Adolescent↗
PubMed1991

Functional and esthetic rehabilitation of an adolescent cleft lip and palate patient.

Many patients with clefts that also affect the alveolar ridge present with congenital absence of the permanent maxillary lateral incisors. This paper describes the treatment of an adolescent cleft lip and palate patient whose missing and unesthetic maxillary incisors were replaced by a combination of fixed and removable partial dentures.

Adolescent↗
PubMed1991

Condylar hyperplasia: remodeling of facial structures following condylectomy. Report of two cases.

Condylectomy accompanied by either simultaneous or postponed surgical correction of facial asymmetry is the treatment of choice in cases of condylar hyperplasia in its active stage. However, spontaneous remodeling processes in facial structures following the elimination of an actively growing hyperplastic condyle may bring about improvement in symmetry without further surgical intervention. Two cases are presented.

Adult↗
PubMed1990

Effect of occlusal functional forces on incisor socket morphology and location in the rat mandible.

The effect of functional occlusal stress on dimensional alterations of the rat incisor socket and mandible were studied from roentgenograms. In 12 rats, the lower left incisor was shortened twice weekly, whereas the lower right incisor was allowed to remain in contact with both upper incisors. Thus, the right incisors were subjected to hyperfunction, and the left ones, to hypofunction. The lower incisors of 16 rats with normal occlusal contact served as control. Following an experimental period of 3 months, the animals were killed and standardized radiographs were taken of the cleaned mandibles. Socket and mandibular dimensions were measured on magnified tracings of the roentgenograms. Socket area, its posterior length, posterior mandibular length, and gonial angle changed in the same direction under both hyper- and hypofunction. The anterior socket was relocated in opposite directions: under hyperfunction, it assumed a more inferior position, whereas in hypofunction, it moved superiorly. The angulation of the socket became significantly more acute under hyperfunction, whereas in hypofunction, this parameter remained unchanged. It is concluded that altered functional demands affect the morphology of the incisor socket and its location within the mandibular borders.

Animals↗
PubMed1990

Correlation between nasal width and maxillary incisal alveolar width in post-natal facial development.

The paired nasomedial processes of the prenatal developing face contribute to the formation of the nasal region as well as the alveolar segment of the maxillary four incisors. The objective of this investigation was to determine whether or not there is a common anatomic relationship between the transverse nasal dimension and the corresponding transverse alveolar dimension that is continued in the post-natal period. The corresponding transverse dimensions were measured on a longitudinal series of 120 A-P cephalograms. In addition, A-P cephalograms of 24 dried skulls and also of 19 individuals having severe craniofacial malformations were analysed. The mean difference between the nasal dimensions and the corresponding alveolar dimensions ranged from 0.14 to 1.72 mm in the various groups. However, the statistically significant correlation coefficients between the measured dimensions were low (range r = 0.36-0.57). The developmental stage did not affect this relationship. Crowding was not found to be a major factor explaining the variability, although sex was seen as a significant factor.

Adolescent↗
PubMed1990

Long-term effects of orthodontic forces on the morphology of the rat-incisor socket and its location in the mandible.

The effect of orthodontic force application on the rat-incisor socket and mandible was studied on roentgenograms. A mean linguo-intrusive force of 19 +/- 0.6 g was applied continuously to the shortened left lower incisor for a period of two (group A) and four weeks (group B). A third group of rats, subjected to shortening of the left mandibular incisor only, served as a hypofunctional control (group C). A fourth group of normal rats constituted the intact control (group D). After a recovery period of three months, the animals were killed, and standardized roentgenograms of the cleaned mandibles were taken. Socket and mandibular dimensions were measured on magnified tracings of the roentgenograms. Comparison of groups A and B with the control groups, on the one hand, and of group C with group D, on the other, facilitated isolation of the hypofunctional factor. In groups A and B, the orthodontic forces caused changes in the parameters affected (i.e., socket area, alveolar bone thickness, mandibular dimensions) and not affected by hypofunction (i.e., socket angulation and location, anterior-socket length). The former findings implies modification of the adaptive capability of dental structures to functional demands. It is concluded that mechanical loading of the incisor for two to four weeks causes long-lasting changes in the socket and its surrounding bone.

Adaptation, Physiological↗
PubMed1989

Appearance of a labial notch in maxillary incisors: a population survey.

A labiogingival notch appearing on the enamel of maxillary central incisors seems to be a potential factor for compromised gingival and dental health. The objective of the survey was to describe the phenomenon and its prevalence in a random Israeli population. One thousand eight hundred eighty children with fully erupted permanent incisors were clinically examined. The appearance of the labiogingival notch on the enamel surface of the maxillary central incisors was determined. Two depth categories of the phenomenon were distinguished by probing. The possible differences in the prevalence of the labial notch appearance, between the sexes as well as between the right and left sides, were statistically evaluated. The prevalence between the right and left sides, were statistically evaluated. The prevalence of the labial notch on at least one incisor in the population examined was 6.5% (5.1% unilaterally and 1.4% bilaterally). No significant difference between the sexes regarding the appearance of this phenomenon was found. The shallow notch was similarly distributed between the right and left sides in both sexes. However, the deeper malformations appeared significantly more on the left side in boys (P less than 0.05) and in girls (P less than 0.01). The gingivae tended to follow the enamel contour; however, only in few cases was gingival inflammation or incipient caries diagnosed. It was concluded that the labio-gingival notch is not a rare phenomenon, and it should be given special attention to prevent possible damage to the dental and gingival tissues.

Anthropology, Physical↗
PubMed1989

Mandibular rotation and lower face height indicators.

Lower face height indicators and mandibular rotation are assessed at 7 and 12 years of age in a sample of 46 children, comparing the corpus axis and mandibular plane as indicators of change in mandibular position. The parameters involving the mandibular plane consistently show higher correlations.

Cephalometry↗
PubMed1988

Effect of trauma to the primary incisors on the alignment of their permanent successors in Israelis.

117 children who had experienced trauma to their primary incisors were re-examined in their transitional or permanent dentition stage. The control group consisted of 174 children with a corresponding dental developmental age. All the children were examined clinically and the intra- and interarch relations of the anterior segments were recorded. The prevalence of patients with at least one malposed incisor was higher in the trauma group. Trauma to the primary dentition was found to be a contributing factor affecting the alignment of the permanent successors. Early loss of the primary incisors did not cause loss of space in most of the cases; however, it was associated with malposition of their permanent successors. Lack of eruption guidance or the direct effect of the injury on the position of the developing bud could be considered as contributing etiologic factors. There was a very low prevalence of more serious malocclusion features, like impaction, in the trauma group.

Child↗
PubMed1985

Eruption of rootless teeth in congenital renal disease.

Eruption of rootless mandibular premolars and other dental defects in a girl suffering from congenital kidney disease are described. The successful management of these excessively mobile teeth allowed them to develop roots of sufficient length. Hypotheses of tooth emergence are viewed in the light of these rootless eruptions.

Bicuspid↗
PubMed1985

Quintuplets with clefts: follow-up at 5 years.

Follow-up observations are presented of a set of quintuplets at 5 years of age. Three of the children were born with different degrees of oral clefting. Height and weight comparisons between siblings with clefts and those without reveal that the most severely affected children lagged in their height measurements at the age of 5 years. This may indicate need for special awareness when caring for such children. A relative constriction of the anterior segment of the maxillary dental arch in two of the affected siblings may reflect a possible effect from previous surgical intervention.

Body Height↗