Paper: Wear of Ceramics and Enamel in artificial chewing simulator (AADR Annual Meeting (March 21-24, 2012))

Wednesday, March 21, 2012: 2:30 p.m. - 4 p.m.

Presentation Type: Oral Session

S. JANYAVULA, S. SINGHAL, D. KOJIC, D. CAKIR, P. BECK, L. RAMP, and J. BURGESS, University of Alabama at Birmingham, Birmingham, AL

Objective:

To evaluate the effect of polished, glazed, aged and adjusted zirconia on opposing enamel.

Methods:

The study (n=8) included 5 groups of zirconia ceramic (Table), a veneering porcelain (Ceramco 3) and enamel (control). The cusps of molars were standardized with a tapered diamond (Brasseler/USA) to serve as the opposing enamel tooth stylus. The ceramic and tooth specimens were mounted in holders using acrylic resin, scanned to determine surface roughness (Ra) and then load cycled in a newly developed UAB-chewing simulator (10N vertical load/2mm slide/20cycles/min). A solution of artificial saliva (33.3% glycerin/66.6 % water) was used as third body media. PVS impressions (3M ESPE/USA) of each opposing enamel cusp were taken at baseline, 200,000 and 400,000 cycles and poured with vacuum mixed die stone (WhipMix/USA). The stone models were separated from the impression and scanned using a 3D non-contact surface profilometer (Proscan 2000/UK). Scans from baseline were compared to scans obtained after 200,000 and 400,000 load cycles and were super-imposed (Proform/UK) to determine enamel and ceramic wear (mm³). Data was analyzed with ANOVA and Tukey-Kramer post-hoc tests (p=0.05).

Results:

Mean±SD

Ceramic volume loss(mm³)

Opposing enamel volume loss (mm³)

Original roughness (µ)

Cycles

200,000

400,000

200,000

400,000

1

Polished zirconia

0.00±0.0^a

0.00±0.0^a

0.11±0.04^a

0.21±0.05^a

0.17±0.07

2

Glazed zirconia

0.381±0.1^c,d

0.62±0.16^c,d

0.87±0.21^c,d

1.18±0.2^c,d

0.76±0.12

3

Polished then reglazed zirconia

0.27±0.06^c

0.49±0.10^c

0.59±0.1^c

0.88±0.12^c

0.69±0.1

4

Glazed and adjusted Zirconia

0.32±0.08^b

0.53±0.09^b

0.29±0.15^b

0.43±0.19^b

3.8±0.2

5

Artificially aged zirconia

0.00±0.00^a,b

0.00±0.00^a

0.16±0.04^a,b

0.25±0.05^a

0.23±0.04

6

Ceramco3

0.87±0.1^b

0.42±0.11^b

1.46±0.5^b

2.15±0.5^b

2.6±1.1

7

Enamel

0.24±0.08^d

1.29±0.1^d

0.29±0.21^d

0.49±0.2^d

1.6±0.16

Similar superscripts represent statistically similar groups.

Conclusions :

- Polished zirconia wears enamel the least (p<.05).

- Glazed zirconia had the greatest enamel wear (p=.05).

- Ceramco 3 veneering porcelain had significantly greater wear than all other ceramics. Supported in part by a grant from Ivoclar.

This abstract is based on research that was funded entirely or partially by an outside source: Ivoclar

Keywords: Ceramics and Prosthodontics

See more of: Keynote Address and Reliability, Fatigue, and Wear Behavior of Ceramics
See more of: Dental Materials 3: Ceramic-based Materials and Cements

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		Ceramic volume loss(mm³)		Opposing enamel volume loss (mm³)			Original roughness (µ)
		Cycles
		200,000	400,000		200,000	400,000
1	Polished zirconia	0.00±0.0^a	0.00±0.0^a		0.11±0.04^a	0.21±0.05^a	0.17±0.07
2	Glazed zirconia	0.381±0.1^c,d	0.62±0.16^c,d		0.87±0.21^c,d	1.18±0.2^c,d	0.76±0.12
3	Polished then reglazed zirconia	0.27±0.06^c	0.49±0.10^c		0.59±0.1^c	0.88±0.12^c	0.69±0.1
4	Glazed and adjusted Zirconia	0.32±0.08^b	0.53±0.09^b		0.29±0.15^b	0.43±0.19^b	3.8±0.2
5	Artificially aged zirconia	0.00±0.00^a,b	0.00±0.00^a		0.16±0.04^a,b	0.25±0.05^a	0.23±0.04
6	Ceramco3	0.87±0.1^b	0.42±0.11^b		1.46±0.5^b	2.15±0.5^b	2.6±1.1
7	Enamel	0.24±0.08^d	1.29±0.1^d		0.29±0.21^d	0.49±0.2^d	1.6±0.16

26 Wear of Ceramics and Enamel in artificial chewing simulator