Enamel Cracks and Ceramic Bracket Failure during Debonding In Vitro

Bishara, Samir E.; Ostby, Adam W.; Laffoon, John F.; Warren, John J.

doi:10.2319/112007-540.1

Cited by 87 publications

(81 citation statements)

References 23 publications

(43 reference statements)

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“…In other words, a selection of the appropriate Er:YAG laser pulse duration corresponding with adequate thermal annealing results in reducing the applied force needed to debond the ceramic brackets. This potentially eliminates the breakage rate in ceramic brackets compared to the breakage rate in traditional ceramic bracket debonding [11][12][13].…”

Section: Discussionmentioning

confidence: 99%

Thermal Effect of Er:YAG Laser Pulse Durations on Teeth During Ceramic Bracket Debonding

Hamadah¹,

Bachir²,

Zamzam³

2016

Dent. Med. Probl.

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Debonding of the ceramic brackets with the aid of laser technology has become a certified technique in the field of orthodontics, as the use of a laser eliminates the problems of debonding that are associated with the traditional method. These problems may include enamel cracking and broken ceramic brackets, as well as the pain experienced by the patient during the removal of ceramic brackets [1]. Moreover, the use of a laser reduced the efforts and time needed for brackets debonding through thermal annealing of orthodontic brackets [2]. However, the effects of different lasers on the teeth and pulp tissue have not been fully determined. AbstractBackground. Deboning of ceramic brackets using a Er:YAG laser has become an acceptable method to facilitate the removal of such type of brackets. Therefore, research has been conducted to establish safer and more effective techniques. The pulse duration is one of the most critical parameters with respect to thermal effect on the pulp vitality. Objectives. The goal of the current research is to evaluate the thermal effect of different Er:YAG laser pulse durations in order to establish safe and effective protocols of debonding ceramic brackets. Material and Methods. The sample consisted of 45 premolars extracted for orthodontic purposes. A ceramic bracket was bonded to each tooth. The sample was divided into three groups: 15 teeth for pulse duration of 50 µs, 15 teeth for pulse duration of 100 µs, and 15 teeth for pulse duration of 300 µs. All the ceramic brackets were exposed to the Er:YAG laser for 6 s by laser scanning method, with the same air and water conditions, as well as the same pulse energy and repetition rate. The tooth temperature was monitored during debonding the brackets by a thermal camera, and the ceramic bracket was debonded after 18 s. Then, the samples were examined under a microscope to evaluate the presence of the adhesive material. Results. The results showed the absence of a statistically significant difference between the pulse duration of 50, 100 and 300 µs in relation to the rise in temperature of the tooth. However, a statistically significant difference was found in relation to the presence of adhesive materials between pulse duration 50 µs and both 100 and 300 µs, with no statistically significant difference between 100 and 300 µs. Conclusions. Within the limits of this study, both Er: YAG pulse durations of 100 and 300 µs are preferred during ceramic brackets debonding using the laser scanning method (Dent. Med. Probl. 2016, 53, 3, 352-357).

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Section: Discussionmentioning

confidence: 99%

Thermal Effect of Er:YAG Laser Pulse Durations on Teeth During Ceramic Bracket Debonding

Hamadah¹,

Bachir²,

Zamzam³

2016

Dent. Med. Probl.

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“…Because of this, part of the enamel is possibly removed by trauma, increasing the chance of creating cracks or fractures 14 . In contrast, when the control group was removed, an adhesive layer was left adhered to the enamel, which must be removed in subsequent steps.…”

Section: Discussionmentioning

confidence: 99%

Influence of Primekote® polymer in orthodontic bonding

Vargas

Nuernberg

Maciel

et al. 2017

Rev. odontol. UNESP

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Descritores: Resistência ao cisalhamento; braquetes ortodônticos; descolagem dentária; adesividade. AbstractObjective: The Primekote  (TP) polymer was incorporated to the of Orthodontic Bracket mesh base to improve bond strength and make it more efficient. The purpose of this study was to assess the shear bond strength and adhesive remnant index (ARI) of these brackets. Material and method: The test sample consisted of thirty bovine incisors divided into 2 groups: with a group with TP  brackets (n=15), and a control group with Morelli  brackets (n=15) without Primekote  technology. The TransbondTM XT was used as adhesive system in both groups, following the same protocol and manufacturer's instructions. Specimens were stored in distilled water for 24 hours and then submitted to shear bond strength test in a universal testing machine (EMIC DL2000). The assessment of ARI was performed under stereomicroscope by two calibrated examiners. Result: No significant differences (p>0.05) in shear bond strength were found between the two groups according to the independent t-test. The Wilcoxon test was used to assess ARI data and statistical difference was found between Morelli  and TP  Nu-Edge brackets; the last one left less remaining adhesive on tooth surface. Conclusion: TP  brackets had higher adherence to the adhesive system as shown by lower ARI scores, but this does not improve its clinical performance.

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“…The location was specified as occlusal, middle and cervical third of the buccal tooth surface. On the basis of the visual examination of the buccal enamel surface, micro-cracks were categorized to weak (not apparent under normal room illumination but can be visualized with use of the SEM) and pronounced ones (visible with a naked eye under normal room illumination 5,15) ). Following the initial examination with the SEM, the teeth having enamel cracks were randomly divided into two groups of 30: group 1, the teeth were bonded with metal brackets, group 2, ceramic brackets were used.…”

Section: Secondary Teeth Selection Criteriamentioning

confidence: 99%

“…From digital SEM micrographs, vertical height (h) of every tooth's crown was evaluated. For detailed mapping of enamel cracks, the buccal surface was divided in three zones of equal height: 1st zone -cervical third, 2nd zone -middle third, 3rd zone -occlusal third 1,5,12) . With a help of a constructed ruler, every zone was divided in 10 measurement areas (MA), and a total of 30 MA of every tooth were obtained.…”

Section: Secondary Teeth Selection Criteriamentioning

confidence: 99%

“…Various enamel surface modification techniques, the protocols for teeth etching and bonding have been described in respect of the enamel damage following the removal of brackets [1][2][3][4] . Even more attention has been paid to the effect of the debonding procedure on the changes in the tooth structure [5][6][7][8] . However, little is known about the role of the cracks itself to the development of greater extent enamel surface defects after the removal of brackets.…”

Section: Introductionmentioning

confidence: 99%

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Enamel cracks evaluation —A method to predict tooth surface damage during the debonding

Dumbryte¹,

Jonavičius

Linkevičienė

et al. 2015

Dent. Mater. J.

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The objective of this in vitro study was to evaluate the effect of the enamel cracks on the tooth damage during the debonding. Measurements of the cracks characteristics (visibility, direction, length, and location) were performed utilizing a scanning electron microscopy (SEM) technique and mathematically derived formulas (x=h/30, l=n*x) before and following the removal of mechanically retained metal and ceramic brackets. The likelihood of having greater extent enamel defects was higher for the teeth with pronounced cracks (odds vatios, OR=3.728), increased when the crack was located in more than one zone of the tooth (OR=1.998), and the inclination did not exceed 30-45° (OR=0.505). Using ceramic brackets the risk of greater amount tooth structure defects raised 1.45 times (OR=1.450). Enamel crack showing all these characteristics at the beginning of the orthodontic treatment and the use of ceramic brackets might predispose to higher risk of greater extent tooth surface damage after the debonding by 20.4%.

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Enamel Cracks and Ceramic Bracket Failure during Debonding In Vitro

Cited by 87 publications

References 23 publications

Thermal Effect of Er:YAG Laser Pulse Durations on Teeth During Ceramic Bracket Debonding

Thermal Effect of Er:YAG Laser Pulse Durations on Teeth During Ceramic Bracket Debonding

Influence of Primekote® polymer in orthodontic bonding

Enamel cracks evaluation —A method to predict tooth surface damage during the debonding

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