Shear bond strength of the three different kinds of resin cement on CAD/CAM ceramic inlay

Chul-Woo Baek; Cheol-Woo Park; Jun-Sub Park; Jae-Jun Ryu

doi:10.4047/jkap.2013.51.1.20

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Baek, Park, Park, and Ryu: Shear bond strength of the three different kinds of resin cement on CAD/CAM ceramic inlay

ORIGINAL ARTICLE

J Korean Acad Prosthodont 2013;51(1):20-26.

Published online: 18 December 2013

DOI: https://doi.org/10.4047/jkap.2013.51.1.20

Shear bond strength of the three different kinds of resin cement on CAD/CAM ceramic inlay

Chul-Woo Baek, DDS, MSD¹, Cheol-Woo Park, DDS, MSD¹, Jun-Sub Park, MSD, DDS, PhD², Jae-Jun Ryu, DDS, MSD, PhD^1,^∗

^¹Department of Esthetic Restorative Dentistry, Graduate School of Clinical Dentistry, Korea University, Seoul, Korea

^²Goodwill Dental Hospital, Pusan, Korea

∗Corresponding Author: Jae-Jun Ryu Korea University Ansan Hospital, Gojan 1-dong, Danwon-gu, Ansan, Gyeonggi-do, 425-707, Korea +82 31 412 5370: e-mail, koprosth@unitel.co.kr

Received 10 October 20128 December 2012 Accepted 5 January 2013

This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/3.0/) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Purpose

The purpose of this study was to evaluate the bond strengths between the latest CAD/CAM ceramic inlay and various resin cements which are used primarily for esthetic restoration.

Materials and methods

Cylindrical ceramic blocks(Height: 5 mm, diameter: 3 mm) were fabricated by using Cerec3 and bonded on the dentin of the ninety extracted caries-free molars using three different kinds of resin cement(Unicem, Biscem and Variolink II according to the manufacturer's instructions. Ninety specimens were divided into 3 groups according to three different kinds of resin cement. Half of each group were conducted thermocycling under the conditions of the 5 - 55℃, 5,000 cycle but the other half of them weren't. All specimens were kept in normal saline 37℃, for 24 hours before measuring the bond strength. The shear bond strength was measured by Universal testing machine with a cross head speed of 0.5 mm/min. The results were analyzed statistically by t-test and one-way ANOVA.

Results

Unicem group showed the highest shear bond strength despite a slight decline by thermocycling. The shear bond strength of Unicemgroup and ValiolinkII group were significantly influenced by thermocycling, whereas Biscem group was not influenced (P<.05). There were no significant differences in the bond strength between the three groups without thermocycling, but there was significant differences between Unicem group and Valiolink II group with thermocycling(P<.05).

Conclusion

It has been shown to be clinically effective when the self-adhesive resin cements Unicem and Biscem were used instead of the etch-and-rinse resin cement Valiolink II during the bonding of CAD/CAM ceramic inlay restorations with teeth. (J Korean Acad Prosthodont 2013;51:20-6)

Keywords: Resin cement, Cerec3, Ceramic inlay, Shear bond strength, Thermocycling

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Fig. 1.

Cementation of ceramic and prepared specimen.

Fig. 2.

Shear bond test in universal testing machine.

Fig. 3.

Shear bond strength values of all groups with/without thermocycling.

Table 1.

Composition of resin cements used in this study

Resin cement	Main composition	Manufacturer
Unicem^®	methacrylate monomers containing phosphoric acid groups, silanated fillers	3M ESPE, USA
Biscem^®	Bis (hydroxyethyl methacrylate) phosphate (base); tetraethylene glycol dimethacrylate; dental glass	Bisco, USA
Variolink II^®	Bis-GMA⁺, TEGDMA⁺⁺, UDMA⁺⁺⁺	Ivoclar Vivadent, Liechtenstein

⁺ Bis-GMA: bisphenol A-glycidyl methacrylate,

⁺⁺ TEGDMA: triethyleneglycol dimethacrylate,

⁺⁺⁺ UDMA: urethane dimethacrylate.

Table 2.

Mean and Standard variation of the shear bond strength (MPa) of all groups with/without thermocycling (Mean ± SD)

Thermocycling	Resin cement
Thermocycling	Unicem^®	Biscem^®	Variolink II^®
No	20.67 ± 1.98	18.93 ± 2.09	18.91 ± 2.69
Yes	18.93 ± 2.40	17.85 ± 1.91	16.43 ± 2.01

Table 3.

T-test of Unicem^®, Biscem^®, and Variolink II^® with/without thermocycling

Group	t value	P-value∗
Unicem^®	2.17	.039
Biscem^®	1.47	.153
Variolink II^®	2.86	.008

Table 4.

One-way ANOVA for shear bond strength without thermocycling

Source	DF	Sum of squares	Mean square	F value	P-value
Resin cement	2	30.779	15.389
Error	42	217.140	5.170	2.98	.062
Total	44	247.919

Table 5.

One-way ANOVA for shear bond strength with thermocycling

Source	DF	Sum of squares	Mean square	F value	P-value
Resin cement	2	47.269	23.634
Error	42	187.828	4.472	5.28	.009
Total	44	235.097

Table 6.

Result of Tukey multiple comparisons for shear bond strength with thermocycling

Resin cement	N	Mean	SD	F value	P-value	Tukey
Unicem^®	15	18.932	2.397			A
Biscem^®	15	17.852	1.908	5.28	.009	A,B
Variolink II^®	15	16.429	2.007			B

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