One of the causes of dental caries that occurs due to orthodontic treatment is the lack of antibacterial properties in orthodontic adhesive. This study was designated to investigate the effect of orthodontic resin modified by incorporating Nano Cinnamon powder on the shear bond strength of orthodontic brackets. Materials and methods: Heliosit Orthodontic Resin, a photo-activated light cure resin was modified by the addition of Cinnamon in the form of Nano particle powder. Twenty uniform disks were made, 5 as a control and 5 for each concentration of the 1%, 3% and 5% wt/wt Cinnamon modified resin. Their antimicrobial activity against Streptococcus Mutans was tested using the disk diffusion method. Then, the most effective concentration of the modified resin was used to bond metal orthodontic brackets to human extracted premolars. The universal testing machine was used to record the shear bond strength of the control and the modified resin. Also, the adhesive remnant index was measured. Results: Disc diffusion method showed that the 3% wt/wt Cinnamon powder modified resin was more effective than 1% with a larger bacterial inhibition zone. Shear bond strengths of the control were 8.50 MPa and 7.20 MPa for the 3% Cinnamon modified resin with no significant difference between them. Also, no significant difference was recorded in the adhesive remnant index scores between the control and the modified resin groups. Conclusion: Findings of this study revealed that the incorporation of 3% Cinnamon Nano particles in orthodontic resin produced an antibacterial effect against Streptococcus mutans without compromising the shear bond strength. Clinical relevance: Incorporation of Cinnamon Nano particles in orthodontic resin may reduce caries formation around brackets during treatment course.

Aim: The aim of this study was to investigate the effect of different mouth washes and to study the effect of text message reminder on the oral health status of orthodontic patients treated with fixed appliances. Methods: This study was a clinical trial with pre-test and post-test control group design, conducted on 24 patients undergoing fixed orthodontic treatment aged 15-30 years. The patients randomly divided into two groups; one received a weekly telephone text massage reminder for the instructions of brushing and rinsing while the second group did not receive any messages. Ortho-plaque index and gingival index were used to evaluate the patient’s oral hygiene status. The reading indices after brushing only were regarded as a control, then the patients were instructed to use two mouth washes, one containing sodium fluoride with cetylpyridinium chloride, the second containing chlorhexidine digluconate with cetylpyridinium chloride and Aloe Vera. Each one was used routinely for 4 weeks with the same amount and method. The washout period between the two types mouth washes was 4 weeks with a standardized toothbrush and paste. Results: Ortho-plaque index values decreased over the time between first, second and third visits. However, this index raised up at the fourth visit and again dropdown at the fifth visit. Similar results were detected for gingival index. Also, significant interaction between messages and the assessments was recorded for gingival index with a significant difference between the group of text messages and without text messages group (p<0.05). Conclusions: The results of this study showed that the combination of sodium fluoride with cetylpyridinium chloride was more potent for plaque control, while chlorhexidine digluconate with cetylpyridinium chloride and Aloe Vera combination showed a better gingival improvement. Moreover, the text messages reminder could enhance, but not replace direct oral hygiene instruction in orthodontic patients.