Shear Bond Strength of Orthodontic Brackets Luted with RMGIC After Er:YAG Laser Etching with Two Pulse Modes Using a Digitally Controlled "X-Runner" Handpiece.
Photomed Laser Surg
; 36(11): 608-613, 2018 Nov.
Article
en En
| MEDLINE
| ID: mdl-30227107
ABSTRACT
OBJECTIVE:
To compare the shear bond strength (SBS) values of orthodontic brackets luted using a resin-modified glass ionomer cement (RMGIC) on enamel surfaces etched using either an ErYAG laser in two different working modes, or a conventional etching protocol, including phosphoric acid. MATERIALS ANDMETHODS:
Sixty healthy human premolars were randomly allocated to three experimental groups (n = 20) and etched with Group 1 ErYAG laser in super-short pulse (SSP) mode (100 mJ, 20 Hz, 2 W); Group 2 ErYAG laser in quantum square pulse mode (120 mJ, 10 Hz, 1.2 W) using a digitally controlled handpiece ("X-Runner"); Group 3 (control) 5.25% sodium hypochlorite pretreatment, then 37% phosphoric acid for 15 sec. Stainless steel brackets were bonded using light-curing RMGIC for orthodontic bonding. After term cycling (1800 cycles), SBS testing was performed using a universal testing machine. After debonding, both enamel and bracket surfaces were examined to determine the amount of RMGIC still present on the surfaces.RESULTS:
Group 3 surfaces gave the lowest mean SBS (10.6104 ± 2.66196 MPa), whereas Group 1 provided the highest 1 (13.1795 ± 3.37904 MPa), which was significantly different from the control (Group 3, p = 0.0226). Group 2 provided intermediate values (11.8486 ± 0.59832 MPa) nonsignificantly different from the control or from SSP (p = 0.4215 and p = 0.3082, respectively).CONCLUSIONS:
ErYAG laser treatment in SSP mode of enamel surfaces for orthodontic bonding provided higher SBS and a shear behavior of the luting material similar to the conventional acid-etching procedures, making it a viable alternative to acid etching.Palabras clave
Texto completo:
1
Banco de datos:
MEDLINE
Asunto principal:
Recubrimiento Dental Adhesivo
/
Soportes Ortodóncicos
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Grabado Dental
/
Láseres de Estado Sólido
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Cementos de Ionómero Vítreo
Tipo de estudio:
Guideline
Límite:
Humans
Idioma:
En
Año:
2018
Tipo del documento:
Article