PURPOSE To search if the shear bond strengths of brackets would change after two different base-cleaning procedures such as sandblasting or carbide bur cleaning, and to determine if a previously bonded tooth surface had any effect on bond strength. MATERIALS AND METHODS A total of 120 new brackets were first bonded to 120 extracted premolars and then debonded and bond strength was recorded. T...

OBJECTIVES Debonding is a common occurrence in orthodontic treatment and a considerable number of orthodontists prefer to rebond the detached brackets because of economic issues. The aim of this study was to compare the microleakage beneath rebonded stainless steel brackets using two methods of adhesive removal namely sandblast and laser. MATERIALS AND METHODS Sixty human premolar teeth were ...

AIM To assess the effect of different bracket base conditioning method on shear bond strength (SBS) of rebonded brackets. MATERIALS AND METHODS Eighty brackets were bonded to freshly extracted premolar teeth using light cured composite adhesive. SBS was measured for 20 random samples as control group (G1). After debonding, 60 debonded brackets were allocated randomly into three groups of brac...

We survey theoretical approaches to understanding the diverse metastable behavior in hydrogenated amorphous silicon. We discuss a recently developed network-rebonding model involving bonding rearrangements of silicon and hydrogen atoms. Using tight-binding molecular dynamics we find non-radiative recombination can break weak silicon bonds with low activation energies, producing dangling bond–fl...

OBJECTIVE Bond failure of brackets during orthodontic treatment is a common problem; which results in treatment interference, increased treatment time and prolonged clinical time for rebonding of failed brackets. The purpose of this study was to evaluate the effects of Coca-Cola and a non-alcoholic beer on the shear bond strength and adhesive remnant index (ARI) of orthodontic metal brackets in...

Background: Infant's transition is a challenge for parents and the health system that requires ongoing assessment and management to improve each newborn`s growth and development. The purpose of this study was to explore the management of infant` transition from neonatal intensive care unit (NICU) to home. Materials and Methods: We used a grounded theory study to explore and describe the managem...

AIM To test the null hypothesis that there are no significant differences in the reusability of debonded brackets with regard to debonding technique and adhesive used. METHOD Ninety-six osteotomed third molars were randomly assigned to two study groups (n = 48) for bonding of a 0.018-inch bracket (Ormesh, Ormco) with either a composite adhesive (Mono-Lok2; RMO) or a glass ionomer cement (GIC;...

A central issue in the performance of tokamak fusion devices is the choice of the plasma-facing materials. During the device operation the plasma-facing surfaces are subject to extreme heat and particle loads, as they are impinged on by escaped fusion plasma particles. Although carbon-based materials have excellent thermomechanical properties in view of the high heat flux, their use in the next...