ABSTRACT
Statement of Problem: There is no enough published data about the shear bond strength of resin modified glass ionomer adhesives on caries-affected primary tooth dentin excavated using minimally invasive systems
Objective: To evaluate the shear bond strength of 2 different adhesives [one resin modified glass ionomer and one resin] using two caries removal techniques on healthy and caries-affected primary dentin
Materials and Methods: Two caries removal methods including mechanical [handpiece] and chemomechanical [Carisolv] techniques and two types of adhesives including one resin adhesive [Clearfil SE Bond; CSEB, Kuraray] and one resin-modified glass ionomer adhesive [Riva Bond LC; RBLC, SDI] were used in this study. Ten extracted healthy primary teeth were used for the control group. The teeth were sectioned bucco-lingually and mesio-distally in order to obtain four specimens from each tooth. Thirty suitable specimens were selected as the "control" and randomly divided into two groups of "sound dentin" based on the type of the adhesive used. Sixty extracted caries affected teeth were used for the carious group; sectioned as mentioned above and sixty suitable specimens were selected as the "treatment". Then the specimens were arbitrarily divided into four groups based on caries removal techniques and the type of adhesive used [n = 15]. After bonding with either CSEB or RBLC, the specimens were restored with a resin composite by means of PVC tubes and subjected to the shear bond strength test. The data was analyzed using ANOVA and Tukey's test
Results: The specimens in Carisolv group bonded with CSEB [11.68 +/- 3.1] showed a statistically significant higher mean bond strength followed by those in handpiece group bonded with CSEB [9.4 +/- 2.7], which exhibited higher mean values than those groups with RBLC [p < 0.05]. Shear bond strength values for Clearfil SE Bond was not significantly higher than Riva Bond LC when used in sound dentin
Conclusion: The lowest shear bond strengths for both adhesives were observed on caries-free dentin
ABSTRACT
Statement of Problem: Success in pulpectomy of deciduous teeth greatly depends on the accuracy of root length measurements which have mostly been done radiographically. However, X-ray risks and patient cooperation have usually been a challenge for the clinicians
Purpose: The clinical comparison of root length measurements with electronic apex locator and conventional radiography in 4-6 year old children's mandibular deciduous teeth was the aim of the present study
Materials and Method: In the current clinical trial, 15 mandibular molars with 60 canals in 4-6 year old patients who had the treatment plan of pulpectomy were chosen. The measured root lengths with apex locator and parallel technique radiography were evaluated with the same reference point. Data were analyzed using simple linear regression, coefficient of correlation, coefficient of variability and also graphic Bland Altman Plot
Results: The accuracy of electronic apex locator measurements in +/-0/5 from apical foramen was 85%. In all cases without considering pulp situation, the difference between the two techniques was not significant
Conclusion: The electronic apex locators are recommended for root length measurements of the deciduous mandibular molars without apical resorption, disregarding the pulp status, especially when initial radiographic films are available
ABSTRACT
Ferrous sulphate derivatives in the form of syrup or drop are administered in children 6 to 24 months old to prevent iron deficiency. Many parents consider dental caries to be caused by consumption of iron and they stop its use. There is need to further studies for better clearance of this subject and the present study aimed in this direction. The objective of this research was to evaluate the dmft and the route of using the iron derivatives and its relationship with dental caries. Other related factors were also surveyed. This cross sectional research was conducted on 280 children [2-5 year old boys and girls]. Data collection such as dmft, iron consumption, was achieved by examination of the children's primary teeth as well as giving a questionnaire form to their parents. Chi-Square, Spearman and Smirnov tests were used for statistical analysis of the collected data. Among 280 children under study, 247 [88.2%] children had taken iron supplement, 142 took drop and 54 took the syrup and 51 received both forms and 33 [11.8%] had not taken any kind of iron supplement. The latter group was used as the control group. The mean dmft for all the groups was 2.71 +/- 3.26 and for the control group was 3.03 +/- 2.95, which showed no significant difference between the groups. No statistically significant difference was noticed in relation to the type of infancy nutrition, oral hygiene, children's sex and age, parent's education and length of iron consumption, but a significant relationship was visible with the child's age and the mother's educational level. There was no significant difference for the mean of dmft between the two control and iron consumer groups. As a result, prescription of iron derivatives was not effective in prevalence of dental caries in children but only could cause black stains on their teeth surfaces