COMPARISON OF SHEAR BOND STRENGTH OF FIFTH AND SEVENTH GENERATION ADHESIVE SYSTEMS FOR CERAMIC ORTHODONTIC BRACKETS

Abstract

Debonding forces can cause a fracture of ceramic brackets or adhesive system at tooth / resin interface, because, ceramic brackets have no bending ability. This in turn can create cracks in susceptible enamel. Therefore, safe debonding is considered to be one of the biggest concerns while using ceramic brackets. Aim of this study was to compare mean shear bond strength of ceramic brackets bonded with fifth generation {Transbond XT (3M UNITEK) bonding agent} versus seventh generation bonding agents {ADPER Prompt-L-pop (3M ESPE)}.

This randomized control trial was done at the department of orthodontics, Lahore Medical and Dental College, Lahore, For six months i.e: 30th August 2019 to 29th February 2020.

Sixty untreated maxillary & mandibular extracted premolars of age 12-35 years and both genders were collected from the Department of Orthodontics, Lahore Medical and Dental College (LMDC), Lahore. Defective, restorative and anomalous premolars were excluded. In group A, 5th generation bonding material (Conventional system) was applied. In group B, 7th generation bonding material (Self Etch Primer) was applied. Universal testing machine (Instron) was used to measure shear bond strength.

The mean shear bond strength of brackets was 16.40 ± 3.47 MPa in fifth generation group while 11.40 ± 1.40 MPa in seventh generation group (p-value = 0.0001).

This study concluded that mean shear bond strength of brackets bonded with fifth generation bonding agent is greater than brackets bonded with seventh generation adhesive.