Bond strength and morphology of resin materials applied to the occlusal surface of primary molars.
BACKGROUND
Hydrophilic adhesives may be used as pit and fissure sealants (sealants), but there is concern about the ability of self-etching adhesives to bond sealants to enamel.


OBJECTIVE
To study the bond strength (BS) and morphology of adhesive systems used as sealants.


METHODS
OptiBond FL, OptiBond All-in-One, combined OptiBond All-in-One+OptiBond FL adhesive, and Fluroshield were applied to the occlusal surfaces of 16 primary molars (n = 4). Teeth were stored in distilled water (24 h at 37°C) and sectioned through the interface to obtain sticks (0.8 mm(2) ) tested under a tensile load (0.5 mm/min). Failure modes were observed. Data were analysed by ANOVA and Tukey's tests (α = 5%). The morphology of 12 primary molars was examined in terms of the etching pattern and resin reproduction.


RESULTS
Differences in the BS were found (P = 0.001), with OptiBond FL showing the highest (36.84 ± 5.7 MPa), Fluroshield (24.26 ± 2.13 MPa) and OptiBond All-in-One (17.12 ± 4.97 MPa) similar, and OptiBond All-in-One + OptiBond FL adhesive the lowest (9.8 ± 2.94 MPA). OptiBond FL showed the best results in terms of morphology.


CONCLUSIONS
Under the conditions of this study, OptiBond FL was the best material to be used for sealing.
School of Dentistry, UNOPAR, Londrina, PR, Brazil.
Letícia Vargas Freire Martins
LV
Lemos
Klíssia Romero
KR
Felizardo
Silvio Issao
SI
Myaki
Murilo Baena
MB
Lopes
Sandra Kiss
SK
Moura
D000704:Analysis of Variance; D002648:Child; D001840:Dental Bonding / Q000379:methods*; D003743:Dental Enamel / Q000187:drug effects* / Q000648:ultrastructure; D006801:Humans; D008963:Molar; D010895:Pit and Fissure Sealants / Q000737:chemistry / Q000627:therapeutic use*; D019279:Resin Cements / Q000737:chemistry / Q000627:therapeutic use*; D018709:Statistics, Nonparametric; D014094:Tooth, Deciduous
D010895:Pit and Fissure Sealants; D019279:Resin Cements