Comparative Evaluation of Shear Bond Strength of Orthodontic Brackets using Laser Etching and Two Conventional Etching Techniques: An in vitro Study

Jamenis, Shilpa Chawla; Kalia, Ajit; Sharif, Kanaan

doi:10.1177/0974909820110306

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“…On the other hand, because in 1W and 2W laser etching groups the average SBS mean were 3.8MPa and 4.5MPa respectively, which are considered below average SBS, thus laser etching at these settings seems unacceptable for clinical use. These results were agreed with (von Fraunhofer et al, 1993b, Başaran et al, 2011a,and were opposite to (Usumez et al, 2002, Jamenis et al, 2011 whom found that laser at 2W power output can etch the enamel, this difference is probably the result of different parameters I.E pulse frequencies or maybe the hand-controlled sweeping motion of the laser beam during the conditioning; the motion might cause a weakly standardized etching pattern throughout the irradiated area.…”

Section: Discussionsupporting

confidence: 79%

Comparison of Enamel Acid Etching And Er, Cr: Ysgg Laser Etching on The Shear Bond Strength of Stainless Steel Orthodontic Brackets (an in Vitro Study)

Mudhir¹,

Rasheed²

2019

juod

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Objective: This laboratory study examined the influence of laser irradiation of enamel etching at 3 different power settings with an erbium, chromium: yttrium, scandium, gallium, garnet (Er, Cr: YSGG) hydrokinetic laser system on the shear bond strength of orthodontic appliances and compared these with that of acid-etching. Materials and methods: 64 maxillary premolars, extracted premolars for orthodontic purposes were used in this study, teeth were randomly divided into four groups. In Group 1, the buccal enamel surface was etched with 37% phosphoric acid (3M ESPE), In groups 2, 3, and 4, erbium, chromium-doped: Yttrium scandium-gallium-garnet (Er, Cr: YSGG) laser was used for etching, under the following specifications: Group 2 (1.0 Watt/20 Hz, 15 s), Group 3 (1.5 Watt/20 Hz, 15 s), and Group 4 (2.0 Watt/20 Hz, 15 s). After teeth surface preparation, standard edgewise stainless steel premolar brackets were bonded; 1 tooth in each group was not bonded and was examined under a scanning electron microscopic. Bonded teeth were then stored in normal saline at 37 c for 24 hours. Teeth were then debonded using the universal testing machine, SBS and ARI index scores were measured. Result: Both the 1-Watt and 2-Watt laser irradiations showed fewer bond strengths compared with other irradiations. There was no significant difference in shear bond strength with 1.5-Watt lasing group compared to acid etching group, the evaluation of adhesive-remnant-index scores demonstrated a statistically significant difference in bond failure site among the groups. Generally, more adhesives left on the bracket surface with laser irradiation than with acid etching. Conclusion: Etching obtained with an Er, Cr: YSGG laser (operated at 1.5-Watt for 15 seconds) is comparable to that obtained with acid etch and could be a feasible alternative to acid etching

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Section: Discussionsupporting

confidence: 79%