[Study on the interrelation between dysplasias of permanent teeth and dental-jaw deformities. 1. Clinical-statistical study on the incidence and type of dental-jaw deformities among students with dysplasia of the permanent teeth]. / Izsledvane na vzanmovruzkata mezhdu displaziite na postoiannite zubi i zubno-cheliustnite deformatsii. 1. Kliniko-statistichesko prouchvane vurkhu chestotata i vida na subno-cheliustnite deformatsii pri uchenitsi s displazii na postoiannite zubi.

A total of 125 students, aged from 6 to 18, with dysplasia of the permanent teeth were examined by a qualified pediatric stomatologist and orthodontist. Dental-jaw deformities (DJD) were established in 74.40% of all examined students. Most frequent proved to be the combination of DJD with hypomineralization in mixed dentition (34.41%) and with hypoplasia in permanent dentition--20.45% and hypomineralization--10.75%. The analysis with a view to the type of DJD revealed that the combination between dysplasias of the permanent teeth and deformities in the proportion of the jaws was most frequent (56.84%). The highest relative share of deep bite was established (27.89%) with no tendency to selfregulation in the permanent dentition. The authors underlined the necessity of follow-up care of the students with dysplasia in combination with DJD in connection with the joint therapeutic and orthodontic treatment.

[Some clinical-laboratory indices in children with dental dysplasia of permanent teeth]. / Niakoi klnikolaboratorni pokazateli pri detsa sus zubna displaziia na postoiannite zubi.

The authors studied some serum indices of protein and electrolyte metabolism (total protein, protein fraction, serum calcium, ionized calcium, phosphorus, potassium, sodium, osmolality, Ca/P ratio) in 26 clinically healthy children, aged fro 7 to 10, with clinically diagnosed dysplasia (hypoplasia or hypomineralization) of the permanent teeth. The mean values of the single biochemical parameters for both groups of children remain within referent limits of the respective indices for childhood, and their comparison established no statistically significant differences (p greater than 0.05). That provided grounds the authors to associate with the opinion that enamel defects, localized on a restricted part of the clinical crown of a symmetric group of teeth, could be "markers" for disorders in protein and mineral metabolism only during a certain time period coinciding with the active phases of odontogenesis. The absence of lasting changes in those two metabolisms determined the trends of the secondary prophylaxis--caries-prophylactic measures aiming at the avoidance of complications.

[Hypomineralization of milk teeth of prematurely born children--effect of some factors for its origination]. / Khipomineralizatsiia na vremennite zubi pri nedonoseni detsa--vliiane na niakoi faktori za vuznikvaneto y.

A comparative study was carried out between two groups of children--115 prematurely born and 4830 full-term babies in order to establish the effect of pregnancy duration of the origination of hypomineralization of the milk teeth. The effect of the following factors was also studied and compared: complications of pregnancy, feeding of the newborn and diseases during early childhood of full-term and prematurely born children. The authors established that the prematurely born children were a risk group for the origination of milk teeth hypomineralization. The complications of pregnancy, mixed or bottle feeding as well as the frequent illnesses are additional aggravating factors in the origination of milk teeth hypomineralization. The authors recommend timely follow-up care and prophylaxis of all prematurely born children.