Effect of soft laser in bone repair after expansion of the midpalatal suture in dogs.

INTRODUCTION: The purpose of this research was to study the influence of soft laser treatment on the process of bone repair after expansion of the midpalatal suture. METHODS: The sample for this case-control experimental study was 11 dogs. They were randomly divided into 2 groups, both of which underwent rapid maxillary expansion with a hyrax appliance. The animals in group 1 were also treated with laser therapy. They were killed, and histologic specimens of the palatal suture were prepared. The Student t test was applied for independent data, and the Mann-Whitney test was used for nonparametric data. RESULTS: A significant difference was observed in the quality of the palatal sutures between the animals in groups 1 and 2. The connective tissues of the sutures in the group 1 animals were similar to the original configurations, with more advanced osteogenesis and fibrogenesis, compared with those of group 2. CONCLUSIONS: Soft laser appears to influence the behavior of the repair process, contributing to suture reorganization and palatal bone osteogenesis during and after expansion.

Newborn with malformations and a combined duplication of 9pter-q22 and 16q22-qter resulting from unbalanced segregation of a complex maternal translocation.

We report a patient with duplication of 9pter-q22 combined with duplication of 16q22-qter. The chromosome anomaly was the result of a 3:1 segregation of a maternal translocation (46,XX,t[9;16;21]). This newborn had intrauterine growth retardation and microcephaly, the characteristic recognizable pattern of trisomy 9p, cerebellar hypoplasia, a porencephalic cyst in the parieto-occipital region, and rocker-bottom feet. We compare the clinical features with another previously described case of duplication of an identical 9p segment combined with distal 16q duplication of a similar, but not identical segment, as well as with cases with duplication of either one of the two segments.