A dentifrice with high fluoride concentration could be regarded as a useful therapy of F delivery for high caries-risk patients, since intraoral F levels were sustained throughout most of the day after using this formulation.

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Dental caries and secondary caries are the most common problems in dentistry. Many studies provided evidence for the anticariogenic effect of fluorides. The incidence of secondary caries is decreased in teeth restored with fluoride releasing materials. The purpose of the present in vitro study is to evaluate the fluoride release and uptake capability of two glass-ionomer cements and two compomers. A total number of 60 specimens were prepared according to the manufacturer�s instructions using silicone molds. The specimens were transferred in plastic containers containing artificial saliva (pH=7), incubated at 37�C for 24 h and divided in three subgroups: control group, varnish treated group and dentifrice treated group. The fluoride ion content was measured on five times during a period of 30 days using an Orion 720A fluoride meter with 9609 BN fluoride ion electrode. The self-curing glass-ionomer cement released the highest amounts of fluoride ions at the beginning and after the one month study period. The samples of the four materials tested in the varnish treated groups showed significant differences compared to their control groups on the second day. Dentifrice treated groups did not show significant differences compared to their control groups, except values measured after 30 days. Application of fluoride varnish produced an increase of fluoride release for the first 24 h in case of all materials. However, results suggest that the use of fluoridated dentifrice would be more effective in caries prevention due to their fluoride uptake capability.

Background: Identification of the characteristics of tooth agenesis is an important component in the understanding of the ethiology of this common developmental dental anomaly. The aim of the present study was to determine the prevalence and the characteristics of tooth agenesis among patients from Tîrgu Mureș. Material and method: The present study is retrospective and descriptive, based on the evaluation of the patient’s dental records from 2004 to 2012 belonging to a pediatric dental office from Tîrgu Mureș. Orthopantomograms and anamnestic data of 947 children and young adults (365 male and 582 female) were analyzed. Results: The prevalence of tooth agenesis, excluding third molars, was 7.39%. The difference between the genders was statistically not significant (p = 0.09). The most frequently missing teeth were the upper second incisors, followed by the lower second premolars. The difference between the distribution of agenesis in the upper and lower jaws was statistically significant (p <0.0001). The distribution of dental agenesis between the anterior region and the lateral region of the maxilla and the mandible showed significant differences (p <0.0001). Symmetrical distribution of tooth agenesis was found more frequently (54.54%) than assymetrical distribution. Conclusions: The maxillary anterior region and the mandibular lateral region were the most affected by dental agenesis in the permanent dentition of the studied population. The maxilla was more affected than the mandible and bilateral forms of agenesis were more frequently than unilateral forms. The more extreme forms of agenesis were found amongst female