Basir MM, Rezvani MB, Chiniforush N, Moradi Z. Effect of CO2, Nd:YAG and Er:YAG Lasers on Microtensile Bond Strength of Composite to Bleached-Enamel.
Open Dent J 2016;
10:148-57. [PMID:
27385998 PMCID:
PMC4911712 DOI:
10.2174/1874210601610010148]
[Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/27/2015] [Revised: 11/17/2015] [Accepted: 12/29/2015] [Indexed: 11/22/2022] Open
Abstract
Background:
Tooth restoration immediately after
bleaching is challenging due to the potential problems in achieving
adequate bond strength.
Objective:
The aim of this study was to evaluate the effect of surface treatment with ER:YAG, ND:YAG, CO2 lasers and
10% sodium ascorbate solution on immediate microtensile bond strength of composite resin to recently bleached enamel.
Materials & Methods:
Ninety sound molar teeth were randomly divided into three main groups (n:30) : NB (without bleaching), HB (bleached with 38% carbamide peroxide)
and OB (bleached with Heydent bleaching gel assisted by diode laser). Each group was divided into five subgroups (n:6) : Si (without surface treatment),
Er (Er:YAG laser), CO2 (CO2 laser), Nd (Nd:YAG laser) and As (Immersion in 10% sodium ascorbate solution). The bonding system was then applied and
composite build-ups were constructed. The teeth were sectioned by low speed saw to obtain enamel- resin sticks and submitted to microtensile bond testing.
Statistical analyses were done using two- way ANOVA, Tukey and Tamhane tests.
Results:
µTBS of bleached teeth irradiated with ND:YAG laser was not
significantly different from NB-Nd group. Microtensile bond strength of OB-Er group was higher than NB-Er and HB-Er groups. The mean µTBS of HB-CO2
group was higher than NB-CO2 group; the average µTBS of HB-As and OB-As groups was also higher than NB-As group.
Conclusion:
Use of Nd:YAG, CO2 lasers
and 10% sodium ascorbate solution could improve the bond strength in home-bleached specimens. Application of ND:YAG laser on nonbleached specimens
and Er:YAG laser on office-bleached specimens led to the highest µTBS in comparison to other surface treatments in each main group.
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