[Shear bond strength of ideal maccoo and brilliant light cure composites in orthodontic bracket bonding to enamel]

Due to the disadvantages of self cure composites, application of light cure composites is suggested in orthodontics but light transmission through metal brackets is in doubt. The aim of this study was to compare shear bond strength [SBS] of Ideal Maccoo and Brilliant composites in bonding steel and ceramic brackets. Eight intact first upper premolars were collected for this experimental invitro study and randomly divided into 4 equal groups. The buccal surfaces were etched and cured by visible light after applying margin bond resin. In the first group Ideal Maccoo composite was applied on the steel bracket base [SI group], bracket positioning in the correct location was done and then curing was performed by visible light for 40 seconds [20 seconds from occlusal and 20 seconds from gingival]. In the second group fascination ceramic brackets with Ideal Maccoo composite [CI group], in the third group ceramic brackets with Brilliant composite [CB group] and in the fourth group steel brackets with Bralliant composite [SB group] were bonded to teeth with the same method. SBS was measured by Zwick testing Machine. To compare the groups, Kolomgrov-Smironov, two way analysis of variance, one way analysis of variance and Tukey tests were used. Mean SBS was 9.71 +/- 3.37, 7.36 +/- 4.40, 5.58 +/- 2.21 and 12.36 +/- 5.77 in SI, CI, CB and SB groups respectively. Tukey test showed significant difference between SB and CB groups [P<0.001], no significant differences was detected between CI and SI, SI and SB and between CI and CB. Ideal Maccoo and Brilliant light cure composites had good capabilities in steel bracket bonding whereas ceramic brackets had lower shear bond strength. In bonding ceramic brackets only Ideal Maccoo composite showed acceptable results

[Comparing the effect of chlorhexidine and persica mouthrinses on periodontal status of fixed orthodontic patients]

Since maintaining good oral hygiene in fixed orthodontic patients is more difficult compared to normal individuals more serious methods for plaque control is needed. One way to improve oral hygiene and gingival health is chemical plaque elimination by means of mouthrinses. The aim of this study was to compare the effects chlorhexidine and Persica mouthrinses on periodontal status of patients undergoing fixed orthodontic treatment. 38 cases with the mean age of 14.2 years were selected among the patients who were refered to Mashhad Dental School for orthodontic treatment. 14 patients were eliminated for different reasons. In all patients before and three months after bonding orthodontic attachments gingival index, gingival bleeding index and mean pocket depth were measured. Then the patients were divided into three groups: for the first group chlorhexidine and for the second group Persica was prescribed. The third group did not receive any mouthrinse and was mentioned as control group. 30 days after using mouthrinses all of the indices were measured for the third time. SPSS software was used for data analysis and after confirming normal distribution of these data, paired t-test and ANOVA with 95% confidence interval were used. Gingival index, plaque index and mean pocket depth showed significant increase after beginning orthodontic treatment. Gingival index had a significant reduction in all groups after prescribing mouthrinses but this reduction was not significant between three groups. Mean pocket depth in chlorhexidine group and gingival bleeding index in Persica group had significant reduction. Plaque index did not show significant reduction in any of three groups. Most of the indices show significant increase after bonding of fixed orthodontic appliances. This emphasizes the need for more serious methods of oral hygiene control during orthodontic treatment. Since plaque index and gingival index did not show significant decrease in patients using chlorhexidine or Persica mouthrinses in comparison to control group it is concluded that correct tooth brushing and flossing are the main factors in plaque elimination and gingival health and mouthrinses could be used as an adjuctive