INTRODUCTION: Establishing adequate retention of orthodontic fixed appliances onto the tooth surface is a major
challenge that most orthodontists face throughout the course of therapy. A primerless system possesses various superior
characteristics such as decreased working time and short curing time. It offers adequate bond strength as well, which is one of the
most important properties. AIM: The purpose of the study is to prove that without using the liquid primer, we can get sufficient
bond strength. The elimination of this step will save time and exposure to unpolymerized compounds. MATERIAL AND
METHODS: Twenty eight extracted human first premolars were mounted in plaster of Paris. The samples were categorized as
follows GROUP I- Transbond XT Light Cure Adhesive with primer, Group II- Ormco Enlight Light Cure Adhesive with primer,
Group III- Transbond XT Light Cure Adhesive without primer, Group IV- Ormco Enlight Light Cure Adhesive without primer.
Each group consisted of seven samples. Brackets (0.022*0.028 in 3M UNITEK GEMINI) were bonded onto the premolars and
shear bond strength testing was carried out using Instron testing machine. After testing, the samples were debonded and the tooth
surface characteristics was studied under Scanning Electron Microscopy (SEM) to determine the adhesive remnant index(ARI).
RESULTS: There was statistically significance in the shear strength between different groups, on comparison of Enlight with
primer and other study groups, Enlight without primer and Enlight with primer, Transbond XT with primer and Enlight with primer,
Transbond XT without primer and Enlight without primer. (P < 0.05). CONCLUSION: Our findings did not show any significant
difference while using Transbond XT with primer and without primer.
Key words: Shear bond strength; Primer; Without Primer; Light Cure Composite.