IJSR International Journal of Scientific Research 2277 - 8179 Indian Society for Health and Advanced Research ijsr-8-4-18791 Original Research Paper COMPARISON OF SHEAR BOND STRENGTH BETWEEN CUSTOM MADE MULTISTRAND BONDED RETAINERS WITH THAT OF CUSTOM MADE CASTED FIXED RETAINER IN DIASTEMA CASES PREMKUMAR Dr. DR.S.SUMALATHA Dr. April 2019 8 4 01 02 ABSTRACT

AIM: To compare the shear bond strength between custom twisted 3 stranded ligature wire (0.36mm thick) retainer and custom casted bonded retainer. MATERIALS AND METHODS: Study involved 80 extracted anatomically similar maxillary central incisors for various reasons and divided into 2 groups, group–1 bonded with custom made 3 stranded twisted ligature wire, Group–2 bonded with custom casted retainer and stored in distilled water for 24 hours and shear bond strength is tested using instron universal testing machine. RESULTS: Group –2 with custom casted retainer showed more mean SBS than Group–1 with multistrand custom made retainer. The maximum SBS for Group–1 was 132.73N and with the minimum of 97.33N and in Group–2 the maximum SBS were 264.52N and with the minimum of 147.12N and comparison was statistically significant.p>0.005 CONCLUSION : In the present study both the groups showed resistance more than the required amount of force still Group–2 with custom casted retainer showed mean SBS of 172.74N which is significantly higher than the Group–1 and it is very much advisable to use it as permanent retainer for midline diastema cases