Abstract
Objectives: To test the wear characteristics of an experimental high-strength fine-sized leucite glass-ceramic against human enamel.
Methods: A wear testing protocol was adapted on an MTS-Bionix-858 system. Human enamel pins were wear tested against disc samples (n=12) of a commercial control (Ceramco-3, Dentsply) and an experimental fine-grained leucite glass-ceramic. Specimens were loaded (13.5N) followed by a lateral excursion movement and a controlled cuspal contact time (0.25s) to complete a cycle for 300,000 simulated masticatory cycles at 2Hz under continuous flow of deionised water (37C). Wear quantification (volume/ mean-height loss) was performed by superimposition of digitised test surfaces before and after wear testing by non-contact 3D profilometry (Proscan-2000, Scantron) and the dedicated software using a novel protocol. Glass-ceramic disc/ tooth specimen groups were statistically compared (Mann-Whitney, p<0.05). Wear tested specimens were examined using SEM and Profilometry. Indicative surface roughness (Ra)/ waviness measurements (500 x,y line scans/ specimen) were also performed on a glass-ceramic disc/ tooth pair per group.
Results: Volume and mean-height loss results are listed below. A patterned wear profile with distinct parallel grooves was identified for the Ceramco-3 group versus the non-oriented wear profile of the experimental group. All recorded Ra and wave-height values for the experimental disc/ tooth group were lower than the Ceramco-3 group. Categories Ceramco-3 glass-ceramic Experimental glass-ceramic Volume loss(mm3) (Discs) 0.164(0.158,0.217)a 0.190(0.154,0.214)a Volume loss(mm3) (Teeth) 0.208(0.127,0.252)a 0.133(0.110,0.151)b Mean-Height loss(μm) (Discs) 61.8(55.2,72.0)a 67.9(60.0,72.5)a Mean-Height loss(μm) (Teeth) 88.3(69.8,103.0)a 65.7(56.0,77.5)b *Values represent medians (25%,75%percentiles). Different superscript letters indicate significant (p<0.05) differences between groups within categories.
Conclusions: The experimental glass-ceramic exhibited significantly (p<0.05) lower antagonistic enamel wear when compared to a commercial control. Development of the fine-sized leucite material tested may support its use to achieve reduced rates of enamel loss.
(Medical Ethics REC: 06/Q0603/98, Funding: StBarts and The London Charitable foundation, RAB05/PJ/06, National Scholarships Foundation, IKY,Greece)
Methods: A wear testing protocol was adapted on an MTS-Bionix-858 system. Human enamel pins were wear tested against disc samples (n=12) of a commercial control (Ceramco-3, Dentsply) and an experimental fine-grained leucite glass-ceramic. Specimens were loaded (13.5N) followed by a lateral excursion movement and a controlled cuspal contact time (0.25s) to complete a cycle for 300,000 simulated masticatory cycles at 2Hz under continuous flow of deionised water (37C). Wear quantification (volume/ mean-height loss) was performed by superimposition of digitised test surfaces before and after wear testing by non-contact 3D profilometry (Proscan-2000, Scantron) and the dedicated software using a novel protocol. Glass-ceramic disc/ tooth specimen groups were statistically compared (Mann-Whitney, p<0.05). Wear tested specimens were examined using SEM and Profilometry. Indicative surface roughness (Ra)/ waviness measurements (500 x,y line scans/ specimen) were also performed on a glass-ceramic disc/ tooth pair per group.
Results: Volume and mean-height loss results are listed below. A patterned wear profile with distinct parallel grooves was identified for the Ceramco-3 group versus the non-oriented wear profile of the experimental group. All recorded Ra and wave-height values for the experimental disc/ tooth group were lower than the Ceramco-3 group. Categories Ceramco-3 glass-ceramic Experimental glass-ceramic Volume loss(mm3) (Discs) 0.164(0.158,0.217)a 0.190(0.154,0.214)a Volume loss(mm3) (Teeth) 0.208(0.127,0.252)a 0.133(0.110,0.151)b Mean-Height loss(μm) (Discs) 61.8(55.2,72.0)a 67.9(60.0,72.5)a Mean-Height loss(μm) (Teeth) 88.3(69.8,103.0)a 65.7(56.0,77.5)b *Values represent medians (25%,75%percentiles). Different superscript letters indicate significant (p<0.05) differences between groups within categories.
Conclusions: The experimental glass-ceramic exhibited significantly (p<0.05) lower antagonistic enamel wear when compared to a commercial control. Development of the fine-sized leucite material tested may support its use to achieve reduced rates of enamel loss.
(Medical Ethics REC: 06/Q0603/98, Funding: StBarts and The London Charitable foundation, RAB05/PJ/06, National Scholarships Foundation, IKY,Greece)
| Original language | English |
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| Publication status | Published - Jul 2010 |
| Event | IADR 88th General Session - Barcelona, Spain Duration: 14 Jul 2010 → 17 Jul 2010 |
Conference
| Conference | IADR 88th General Session |
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| City | Barcelona, Spain |
| Period | 14/07/10 → 17/07/10 |