The Instron testing machine was used in this study to record the maximum load necessary to debond
the bracket, using a 5mm metallic rod; shear force was applied parallel to the height of contour of the teeth to the interface of the tooth-bracket in an occluso-gingival direction, with a 1-kn load cell at the crosshead speed of 0.5mm/min.
The upper hood of the double-sided design showcases a medical grade stainless steel Neutrovac which includes an IQ Power static neutralizing bar to electrostatically debond
particles and move debris through a stainless-steel air tube to the vacuum slot for ultimate cleaning.
carried out a prospective randomized controlled clinical trial to compare the clinical effectiveness of bonded retainers with vacuum-formed retainers, in terms of maintaining the results of orthodontic treatment in the lower arch up to 18 months' post debond
. They investigated the effectiveness of these retainers in maintaining the stability of lower anterior teeth.
The load-displacement curve from each test was recorded to obtain the maximum force ([F.sub.max]) and a typical example is shown in Figure 2, where [F.sub.d] is kink force ; when the pull-out force reaches this value, the fiber begins to debond
from the matrix; [F.sub.max] is the peak force caused by debonding force and the frictional load in debonding regions; [F.sub.b] is the tail force caused by frictional load when the embedded fiber totally debond
from the matrix.
Although we evaluated differences in implant design and manufacturing processes, we cannot be sure which design features caused Group 1 implants to debond
significantly more than Group 2 cups.
The maximum load necessary to debond
bracket was recorded in newtons (N) and numeric values were converted into megapascals (MPa) as a ratio of newtons to surface area of the bracket.
As Figure 6(a) provides, for the sheet to debond
at the end part of the beam, the type of fracture and failure of the specimens attributed this beam group happened before reaching the ultimate strength and no rupture was detected in fibres.
RonJohn works almost as quickly as methylene chloride to debond
target coatings and adhesives, but unlike a number of other replacements for methylene chloride, it does not need to be heated to function.
The model of particulate composite is created with respect some general terms (Zuiderduin et al., 2003): (I) aspect ratio of particles must be close to unity to avoid high stress concentration, (II) particles should be of small size (less than 5 [micro]m), (III) particles must debond
prior to the yield strain of the matrix polymer in order to change the stress state of the matrix material and (IV) particles must be dispersed homogeneously in the matrix polymer.
(3,7,14) The aim of the present study was to assess the effect of LED photoactivation on the SBS of orthodontic brackets at different debond
times when compared to that of a traditional QTH system.