Treatment of malocclusions in children and adolescents at a public dental service clinic in Sweden: extent and cost.

This study was undertaken to investigate the extent and the cost of orthodontic consultation and treatment of malocclusions in 19-year-olds at a Public Dental Service (PDS) clinic. A further aim was to evaluate the group of patients who discontinued their treatment prematurely. A total of 223 patient records were reviewed.

Traumatic injuries to permanent teeth among Swedish school children living in a rural area.

Traumatic dental injuries in children and adolescents are a common problem, and several studies have shown that the prevalence of these injuries is increasing. The aim of this study was to make a cross-sectional investigation of all traumatized permanent teeth in children living in a rural area and to estimate the time required for each treatment. Patient records from all children aged between 7 and 17 years living in the district of Boxholm were examined.

Surface resorption following two forms of rapid maxillary expansion.

Rapid maxillary expansion (RME) is a useful orthodontic technique for correction of posterior cross-bite of skeletal origin. The aim of the present study was to compare the frequency and nature of root resorption in premolars subjected to RME by means of either a tissue-borne, fixed split acrylic (Haas) palatal expansion applicance, or an all-wire framework appliance. Another factor examined was the relationship between the pattern of resorption and the duration of the retention period.

Gametogenesis in Chlamydomonas eugametos: I. Light Requirements.

Male and female mating types of Chlamydomonas eugametos Moewus show an absolute light requirement for gametogenesis. Increasing light intensity from 0.3 to 1.

Light and calcium interactions in chlorella inhibited by sodium chloride.

Analysis of NaCl toxicity in Chlorella sorokiniana showed decreased growth rates, increased dry weight per cell, increased intracellular Na(+) and Cl(-), more total chlorophyll per cell, a decreased chlorophyll a to chlorophyll b ratio, increased rates of O(2) evolution, and decreased rates of CO(2) fixation when the extracellular concentration of NaCl was increased from zero to 0.3 m. Cultures did not grow at concentrations greater than 0.