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Indian J Dent Res. 2018 Nov-Dec;29(6):794-798. doi: 10.4103/ijdr.IJDR_230_17.

Comparative evaluation of lithium disilicate ceramic surface and bond strength to dentin surface after treatment with hydrofluoric acid and acidulated phosphate fluoride gel: An In Vitro study.

Author information

1
Department of Prosthodontics, Yenepoya Dental College, Yenepoya University, Mangalore, Karnataka, India.
2
Department of Prosthodontics, VS Dental College, Bengaluru, Karnataka, India.

Abstract

Context:

Long-term retention of the restoration depends on strength and durability of the bond of the luting composite resin to the tooth and the porcelain substrates.

Aims:

This in vitro study was conducted to compare and evaluate the influence of hydrofluoric acid (HF) and acidulate phosphate fluoride (APF) gel-etched treatments on surface roughness and bond strength to dentin of a commercially available lithium disilicate ceramic (E-Max).

Subjects and Methods:

Sixty lithium disilicate ceramic disks measuring 5 mm in diameter and 2 mm thick were fabricated and divided into three groups: Group A (n = 24), Group B (n = 24), and Group C (n = 12) and were subdivided to Group A1, A2, and A3which were surface treated with 1.23% APF gel (pH = 3-4) at different time intervals 4, 7, and 10 min, respectively. Group B1, B2, and B3 were surface treated with 1% APF gel (pH = 1-2) at different time intervals 4, 7, and 10 min, respectively. Group C were surface treated with 9.6% HF (pH = 1-2) for 1 min. Morphological changes obtained with the surface treatments were analyzed using a surface profilometer.

Statistical Analysis:

All specimens were subjected to a tensile bond strength test using a tensometer, and the obtained data were statistically analyzed using Kruskal-Wallis test.

Results:

The surface roughness (μm) and bond strength (MPa) of lithium disilicate discs (samples) etched with 1.23% APF gel and 1% APF gel for 10 min and etched with 9.6% HF for 1 min showed no statistical significant difference among them.

Conclusions:

In this study, the lithium disilicate discs etched with 1.23% APF gel and 1% APF gel for 10 min showed similar surface roughness and bond strength to those etched with 9.6% HF for a minute.

KEYWORDS:

Acidulate phosphate fluoride gel; hydrofluoric acid; lithium disilicate ceramic; profilometer; tensometer

PMID:
30589010
DOI:
10.4103/ijdr.IJDR_230_17
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