Open AccessCan Nd:YAG laser irradiated on dentin with non-polymerized adhesives influence the durability of bond strength and micromorfology of hybrid layer?
Author(s) -
Daphne Câmara Barcellos,
Graziela Ribeiro Batista,
Erasmo de Sousa Persici,
Cesar Rogério Pucci,
Maria Filomêna Rocha Lima Huhtala,
Sérgio Eduardo de Paiva Gonçalves
Publication year - 2016
Publication title -
brazilian dental science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.153
H-Index - 6
ISSN - 2178-6011
DOI - 10.14295/bds.2016.v19i1.1173
Subject(s) - bond strength , adhesive , photopolymer , materials science , dentin , laser , composite material , single bond , irradiation , composite number , dentistry , layer (electronics) , polymerization , chemistry , optics , group (periodic table) , polymer , medicine , nuclear physics , organic chemistry , physics
Objective : This study evaluated the durability of bond strength to dentin using total-etch (Single Bond /SB) and self-etch (Clearfil SE Bond/CSEB) adhesives associated with Nd:YAG Laser irradiation through the unpolymerized adhesives. Also, this study evaluated micromorfological chances in hybryd layer after 12 months wter storage. Material and Methods : Bovine incisors were worn to expose a dentin area and were divided into 4 groups (n = 15): Group 1 (Control) – SB + photopolymerization; Group 2 (Control) – CSEB + photopolymerization; Group 3 (Experimental/Laser) - SB + Nd:YAG laser (149.28 J/cm 2 ) + photopolymerization; Group 4 (Experimental/Laser) – CSEB + Nd:YAG (149.28 J/cm 2 ) + photopolymerization. Composite blocks were fabricated; intact teeth were stored for 24 h or 12 months (12 m), sectioned into beams and submitted to microtensile bond strength tests. Two teeth from each group (n = 2) were prepared for SEM analysis. Results: Results were analyzed by three-way ANOVA (adhesive, Technique and storage time) and Tukey tests (0.05). Results: For interaction Adhesive X Technique X Storage time the mean values (MPa) were: SB/Control/24h = 34.05(±6.14)a; CSEB /Control/24h = 32.12(±5.26)a; SB/Laser/24h = 30.54(±5.94)a; CSEB/Laser/24h = 29.45(±5.11)a; SB/Control/12m = 29.36(±5.57)a; CSEB/Control/12m = 29.09(±8.84)a; SB/Laser/12m = 22.06(±3.77)b; CSEB/Laser/12m = 13.35(± 3.35)c. Conclusion : SEM showed evident areas of micromorphological alterations on lased samples after 12 months water storage with accelerated degradation of the hybrid layer . Bond strength decreased when dentin irradiated with the Nd:YAG laser through unpolymerized adhesives was stored in water for 12 months. Laser irradiation of dentin through unpolymerized self-etch adhesive significantly reduced bond strength when compare with total-etch adhesive after 12 months water storage. Keywords: Dental adhesives; Dentin bonding ; Nd yag; Tensile strength.
Accelerating Research
Robert Robinson Avenue,
Oxford Science Park, Oxford
OX4 4GP, United Kingdom
Address
John Eccles HouseRobert Robinson Avenue,
Oxford Science Park, Oxford
OX4 4GP, United Kingdom