Hafez, A., Nassar, E., Abdelnaby, Y. (2017). INFLUENCE OF PROLONGED CONTINUOUS ORTHODONTIC FORCE ON THE SHEAR BOND STRENGTH OF METALLIC BRACKETS BONDED WITH VARIOUS ADHESIVE SYSTEMS. test, 63(Issue 4 - October (Orthodontics, Pediatric & Preventive Dentistry)), 2931-2938. doi: 10.21608/edj.2017.75989
Ahmad Mohammad Hafez; Essam Abdelalim Nassar; Yasser Lotfy Abdelnaby. "INFLUENCE OF PROLONGED CONTINUOUS ORTHODONTIC FORCE ON THE SHEAR BOND STRENGTH OF METALLIC BRACKETS BONDED WITH VARIOUS ADHESIVE SYSTEMS". test, 63, Issue 4 - October (Orthodontics, Pediatric & Preventive Dentistry), 2017, 2931-2938. doi: 10.21608/edj.2017.75989
Hafez, A., Nassar, E., Abdelnaby, Y. (2017). 'INFLUENCE OF PROLONGED CONTINUOUS ORTHODONTIC FORCE ON THE SHEAR BOND STRENGTH OF METALLIC BRACKETS BONDED WITH VARIOUS ADHESIVE SYSTEMS', test, 63(Issue 4 - October (Orthodontics, Pediatric & Preventive Dentistry)), pp. 2931-2938. doi: 10.21608/edj.2017.75989
Hafez, A., Nassar, E., Abdelnaby, Y. INFLUENCE OF PROLONGED CONTINUOUS ORTHODONTIC FORCE ON THE SHEAR BOND STRENGTH OF METALLIC BRACKETS BONDED WITH VARIOUS ADHESIVE SYSTEMS. test, 2017; 63(Issue 4 - October (Orthodontics, Pediatric & Preventive Dentistry)): 2931-2938. doi: 10.21608/edj.2017.75989

INFLUENCE OF PROLONGED CONTINUOUS ORTHODONTIC FORCE ON THE SHEAR BOND STRENGTH OF METALLIC BRACKETS BONDED WITH VARIOUS ADHESIVE SYSTEMS

Egyptian Dental Journal
Article 3, Volume 63, Issue 4 - October (Orthodontics, Pediatric & Preventive Dentistry), October 2017, Pages 2931-2938    PDF (476.88 K)
Document Type: Original Article
DOI: 10.21608/edj.2017.75989
Authors
Ahmad Mohammad Hafez1; Essam Abdelalim Nassar2; Yasser Lotfy Abdelnaby3
1Lecturer, Department of Orthodontics, Faculty of Dentistry, Mansoura University, Mansoura, Egypt.
2Associate Professor, Department of Orthodontics, Faculty of Dentistry, Mansoura University, Mansoura, Egypt – Dammam University, KSA
3Professor, Department of Orthodontics, Faculty of Dentistry, Mansoura University, Mansoura, Egypt
Abstract
Purpose: To estimate the effect of prolonged continuous force on the shear bond strength (SBS) of orthodontic brackets bonded with different adhesive systems.
Materials and Methods: Eighty premolars were randomly divided into four groups (I, II, III and IV) according to the bonding adhesive used. Orthodontic metal brackets were bonded with one of the succeeding adhesives; Rely-a-bond, Transbond XT primer and adhesive, Transbond Plus self-etch primer (SEP) and Transbond XT adhesive and Smart Bond. Half of the brackets were subjected to 150 g of force for 12 months. All the specimens were thermocycled 1000 times between 5° C and 55° C. A Universal Testing Machine was used to measure SBS.
Results: Transbond XT primer and adhesive exhibited the highest significant SBS value (12.8Mpa). Smart bond showed the lowest value (7.7Mpa). Rely-a-bond and Transbond Plus SEP adhesive systems had middle values (8.8 and 7.8Mpa). There was a significant decrease in the SBS of all studied adhesives (P<0.05) accompanied force application (P <0.05). Smart Bond showed the higher reduction in SBS while Transbond XT primer + Transbond XT adhesive revealed the lesser reduction.
Conclusion: Application of 150 gram of force for 12 months produced a pronounced negative effect on SBS especially with either SEP or Smart Bond.
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