Academic literature on the topic 'Bonding/debonding on-demand'

Recycling adhesively bonded polymers is inconvenient due to its expensive separation and removal of adhesive residues. To tackle this problem, adhesive technologies are needed allowing debonding on demand and which do not contaminate the surface of the substrate. Direct bonding enabled by oxygen plasma treatment has already achieved substantial adhesion between flat substrates. However, debonding takes place by water, thus limiting the applications of this technology to water-free environments. The work presented in the following shows that this drawback can be overcome by grafting acrylic acid and adding copper(II) ions on the surface of polystyrene. In this process, the number of functional groups on the surface was significantly increased without increasing the surface roughness. The bonding strength between the substrates could be increased, and the process temperature could be lowered. Nevertheless, the samples could be debonded by exposure to EDTA solution under ultrasound. Hence, by combining acrylic acid grafting, variations in the bonding temperatures and the use of copper(II) ions, the bonding strength (5 N to >85 N) and the debonding time under the action of water can be tuned over large ranges (seconds to complete resistance).

BACKGROUND The overall success of orthodontic treatment depends on both bonding as well as debonding techniques. The debonding procedure in orthodontics consists of removal of the attachments (brackets, bondable tubes & buttons) as well as all the adhesive resin from the teeth without causing any permanent damage and to restore the teeth to their pre-treatment stage. The demand for more aesthetic appliance led to the introduction of direct bonding techniques and has made banded attachments almost obsolete in present-day orthodontics. These procedures should not be painful to the patient or damaging to enamel and to obtain these objectives a correct debonding technique is of fundamental importance. The debonding procedure is as essential as bonding for the overall success of the orthodontic treatment. In an attempt to increase the bond strength of orthodontic appliances, we have neglected the fact that these appliances have to be debonded at the end of the treatment. In orthodontics debonding refers to debracketing that is removal of brackets, bondable tubes, buttons, and the adhesive used to bond as well as to restore the form and surface of tooth to its best possible original form by avoiding any type of iatrogenic damage. For achieving such objectives, an accurate debonding procedure is of utmost importance, else it could be needlessly lengthy and painful to the patient and damaging to the enamel. Many researches have been carried out to conclude the best techniques for debonding which will give an ideal finish for the tooth when treatment is terminated. The debonding procedure is mostly done by mechanical means, but its technique should be varied according to the bracket material and type. KEY WORDS Debonding Techniques, Metal Brackets, Ceramic Brackets, Enamel Damage