IADR Abstract Archives

Effects of Coloring Procedures on Zirconium/Resin Cement Bond Strength

Objectives: Debonding is the common failure seen in restorations with a zirconium core. In the present study, the shear bond strengths between resin cement and colored zirconium oxide core materials were evaluated.
Methods: Zirconium discs (15x12x1.6mm) were divided into 11 groups of 12 discs each. Groups were colored according to the Vita Classic scale: A3, B1, C4, D2, and D4. Each group was treated with the recommended shading time for 3 s, or with prolonged shading for 60 s, except for the control group. Samples were bounded with 3-mm-thick and 3 mm in diameter translucent resin cement and subjected to shear test in a universal testing machine with a crosshead speed of 1 mm/min. One-way analysis of variance (ANOVA) and Tukey's HSD tests were used for comparisons of the groups having the same shading times. A paired t test was used for groups of the same color (3 s/60 s).
Results: Among the 11 groups investigated B1 (60 s) had the highest bond strength, with a value of 10.05 MPa, while A3 (60 s) showed the lowest bond strength, at 6.72 MPa. However, these differences were not statistically significant.
Conclusions: Zirconium/resin cement bond strength is not effected by zirconium coloring procedures.

Division: IADR/AADR/CADR General Session
Meeting: 2017 IADR/AADR/CADR General Session (San Francisco, California)
Location: San Francisco, California
Year: 2017
Final Presentation ID: 3873
Abstract Category|Abstract Category(s): Dental Materials 4: Adhesion

Authors

Tuncel, Ilkin ( Bezmialem Vakif Univesity , Istanbul , Turkey )

Financial Interest Disclosure: NONE

SESSION INFORMATION

Poster Session
Dental Materials: Techniques for Bonding to Glassy-matrix and Oxide Ceramics
Saturday, 03/25/2017 , 03:45PM - 05:00PM

TABLES

Table I. ICE zirconia sintering program

Final temperature	1500°C
Heating time	~ 3 h
Standby time	2 h
Cooling time	~ 18 min

Table II. Shear bond strengths of groups tested.

Groups	Mean (MPa)	SD (±)	Min (MPa)	Max (MPa)
A3 (3 s)	7.15	3.07	4.33	15.89
A3 (60 s)	6.72	1.67	5.67	10.48
B1 (3 s)	7.68	1.38	5.09	10.45
B1 (60 s)	10.05	4.26	5.87	12.14
C4(3 s)	8.68	1.87	6.70	12.55
C4 (60 s)	8.68	2.80	6.42	14.79
D2(3 s)	8.51	3.42	5.49	16.71
D2 (60 s)	8.14	1.64	6.68	12.55
D4(3 s)	8.05	2.40	5.45	12.54
D4 (60 s)	8.49	2.73	6.42	15.21
Control	9.34	2.61	6.51	15.92

Table III: Fracture types of various groups

Fracture types
Groups	Combined	Cohesive	Adhesive
A3 (3 s)	0	0	12
A3 (60 s)	0	0	12
B1 (3 s)	0	0	12
B1 (60 s)	0	0	12
C4 (3 s)	0	0	12
C4 (60 s)	0	0	12
D2 (3 s)	0	0	12
D2 (60 s)	0	0	12
D4 (3 s)	0	0	12
D4 (60 s)	0	0	12
Control	0	0	12

IMAGES

Fig 1: The samples were dipped in the coloring liquid with a plastic holder.

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Fig 2: The samples were dried under a warming lamp.

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Fig 3: The shear bond strength test set-up.

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