Incorporation of calcium hydroxide to experimental self-etch adhesives for improved long-term dentin bonding

This study investigated the degree of conversion (DC), calcium release (CaR), and long-term dentin bond stability (DBS) of experimental self-etch adhesive systems containing calcium hydroxide. Four adhesive systems were formulated including UDMA, HEMA, GDMA-P monomers, TPO and diphenyl iodonium as p...

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Bibliographic Details
Published in:International journal of adhesion and adhesives 2022-09, Vol.117, p.103181, Article 103181
Main Authors: Amorim, Débora Michelle Gonçalves de, Caldas, Marilia Regalado Galvão Rabelo, Isolan, Cristina Pereira, Moraes, Rafael Ratto de, Queiroz, José Renato Cavalcanti de, Borges, Boniek Castillo Dutra
Format: Article
Language:English
Subjects:
Adhesive strength
Adhesives
Alkalies
Bond strength
Bonding strength
Calcium hydroxide
Dentin
Ethanol
Evaluation
Fourier transforms
Photoinitiators
Self-etch adhesives
Slaked lime
Water storage
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Summary:This study investigated the degree of conversion (DC), calcium release (CaR), and long-term dentin bond stability (DBS) of experimental self-etch adhesive systems containing calcium hydroxide. Four adhesive systems were formulated including UDMA, HEMA, GDMA-P monomers, TPO and diphenyl iodonium as photoinitiator system, and ethanol/water as solvent with different mass fractions of calcium hydroxide: 0% (control), 1%, 2% and 4%. The DC was evaluated through Fourier Transform Infrared spectroscopy coupled to an attenuated total reflectance device. The CaR was evaluated through a spectrophotometer after 3 h up to 168 h. The DBS was measured through the microtensile bond strength method through a microtensile testing machine after 24 h and 12 months of water storage. The data were statistically evaluated using one- and two-way ANOVA and Tukey's post-test (p  0.05). No material released calcium up to 168 h after photoactivation. For DBS, adhesive systems containing 0%, 1% and 4% calcium hydroxide showed statistically similar means between immediate (24 h) and 12-month time-points. The adhesive system containing 2% calcium hydroxide showed statistically higher bond strength at 12-month time-point (p = 0.001). The inclusion of calcium hydroxide to experimental adhesive systems tested did not affect the DC and calcium release. However, the inclusion of 2% calcium hydroxide was able to improve long-term dentin bond strength.
ISSN:0143-7496
1879-0127
DOI:10.1016/j.ijadhadh.2022.103181