The wear of a posterior composite in an artificial mouth: a clinical correlation

Sakaguchi, Ronald L.; Douglas, William H.; DeLong, Ralph; Pintado, Maria R.

doi:10.1016/s0109-5641(86)80034-3

Cited by 190 publications

(108 citation statements)

References 10 publications

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“…21 An average of between 240 000 and 250 000 mastication simulator cycles conforms with 1 year of in vivo wear. 22 The difference between using no lateral movements and 0.7 mm lateral movements led to 8 times more wear. 23 A force of 50 N was used as this is the average force found between the antagonists orally.…”

Section: Discussionmentioning

confidence: 98%

“…The parameters chosen for the mastication simulator were a loading force of 50 N with 250 000 cycles, vertical speed of 30 mm/second, and a lateral movement of 0.7 mm from forward to backward. [21][22][23] The number of cycles was sufficient to cause changes in the antagonist. 21 An average of between 240 000 and 250 000 mastication simulator cycles conforms with 1 year of in vivo wear.…”

Section: Discussionmentioning

confidence: 99%

“…Specific conditions were used for mastication simulation and aging to simulate clinical condtions. [21][22][23][24][25] The experiment was performed underwater, which served as a medium for the removal of any debris from the antagonist and partially simulated the oral environment. The use of steatite balls simulated human enamel when occluded with zirconia in the mastication simulator.…”

Section: Discussionmentioning

confidence: 99%

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Effect of polishing procedures and hydrothermal aging on wear characteristics and phase transformation of zirconium dioxide

Bartolo

Cassar

Husain

et al. 2017

The Journal of Prosthetic Dentistry

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Statement of problem. Yttria-stabilized zirconia used for the fabrication of crowns and fixed\ud \ud prostheses may require intraoral adjustments after placement and cementation. Grinding and\ud \ud polishing methods may result in changes in the surface characteristics of zirconia.\ud \ud Purpose. The purpose of this in vitro study was to assess the effect of polishing procedures on\ud \ud surface roughness, topographical and phase changes of zirconia, and wear of the opposing dentition.\ud \ud Material and methods. Presintered and precut yttria-stabilized zirconia specimens (10×10×1 mm)\ud \ud were divided into 4 groups (control, Intensiv, Shofu, 3M ESPE) depending on the polishing method\ud \ud used to prepare the specimens. All tests were carried out in triplicate. The specimens were polished\ud \ud depending on the polishing regimen, while the control was left untreated. The specimens were\ud \ud thermocycled for 3000 cycles, with a temperature range of 5C to 55C. The surface roughness,\ud \ud elemental, and phase changes caused by polishing before and after thermocycling were assessed\ud \ud with surface profilometry, energy-dispersive spectroscopy, and X-ray diffraction analysis. The wear on\ud \ud antagonist steatite balls was also measured after mastication simulation. Statistical analysis was\ud \ud performed using 1-way ANOVA and the Tukey post hoc test to perform multiple comparison tests (a=.05).\ud \ud Results. The polishing procedures increased surface roughness (Ra) of yttria-stabilized zirconia from\ud \ud 0.52 for the control specimen to 0.73 for Intensiv, 0.70 for Shofu, and 0.70 for 3M ESPE (P<.05), which\ud \ud was reduced by thermocycling to 0.44 (control), 0.58 (Intensiv), and 0.58 (Shofu) (P<.001), while\ud \ud roughness remained unchanged for 3M ESPE specimens (0.75; P=.452). The deposition of aluminum\ud \ud when using Shofu abrasives and nickel in Intensiv was demonstrated. Phase changes were observed\ud \ud on the zirconia surface with formation of the monoclinic phase in all polishing methods. Specimen\ud \ud aging enhanced the surface phase changes and also induced compressive stresses in zirconia\ud \ud polished with Intensiv. The different polishing protocols did not affect the wear to the antagonist (P>.05).\ud \ud Conclusions. Polishing zirconia increased surface roughness and led to surface phase changes, but\ud \ud wear to the antagonist was not affected.peer-reviewe

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Section: Discussionmentioning

confidence: 98%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

See 1 more Smart Citation

Effect of polishing procedures and hydrothermal aging on wear characteristics and phase transformation of zirconium dioxide

Bartolo

Cassar

Husain

et al. 2017

The Journal of Prosthetic Dentistry

View full text Add to dashboard Cite

show abstract

“…The results obtained after 240,000 to 250,000 'masticatory' cycles in a chewing simulator corresponded to the results obtained after one year of clinical service. 23,24 Thus the number of cycles used in the present study could be proportioned to 5 years of service. A force of 49 N was applied during the aging test, thus reflecting normal occlusion and chewing forces for posterior teeth.…”

Section: Discussionmentioning

confidence: 99%

Marginal adaptation of three-unit fixed partial dentures constructed from pressed ceramic systems

et al. 2004

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Purpose This study compares the marginal accuracy of posterior metal ceramic (MC), all-ceramic IPS Empress®2 and experimental pressed ceramic (EPC-VP 1989/4) three-unit fixed partial dentures (FPD), before and after luting and after thermo-mechanical fatigue in a dual-axis chewing simulator. Materials and methods Caries-free human teeth (n=160) were used as abutments for the fabrication of eighty posterior three-unit FPD, divided into two test-groups, IPS Empress®2 and EPC, of 32 samples each and one control group of 16 samples metal ceramic FPD. All FPD were cemented with Variolink®II dual-curing resin cement. Half of the samples in each group were exposed to a dual-axis chewing simulator. Results The geometric mean marginal gap values (µm, before cementation, after cementation and after thermo-mechanical fatigue) amounted to 53, 63 and 62 for the ceramic metal FPD, 57, 71 and 68 for the Empress®2 FPD and 55, 67 and 68 for the EPC FPD. In all groups a statistically significant increase in marginal gap width was observed after cementation. The effect of functional loading in the chewing simulator on marginal gap was not significant. Marginal gap was lowest in the control group but differences with all-ceramic materials were small in all evaluation stages. Conclusion Within the limits of this investigation, it can be concluded that marginal gap values of these all-ceramic materials and conventional MC techniques are on a similar level. In particular, almost all marginal gap values observed in this study were within the limits of clinical acceptance.

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“…The implants were subjected to 10 million loading cycles. This aimed to simulate 10-40 years of loading in vivo, depending on the underlying data for extrapolation suggesting 240,000 up to 1,000,000 chewing contacts per year [17][18][19][20]. A load of 98 N (10 kg) was applied on the highest point to the horizontal of the angulated steel jig.…”

Section: Dynamic Loading Test ("Mechanical Treatment")mentioning

confidence: 99%

Long-term stability of an injection-molded zirconia bone-level implant: A testing protocol considering aging kinetics and dynamic fatigue

et al. 2017

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The wear of a posterior composite in an artificial mouth: a clinical correlation

Cited by 190 publications

References 10 publications

Effect of polishing procedures and hydrothermal aging on wear characteristics and phase transformation of zirconium dioxide

Effect of polishing procedures and hydrothermal aging on wear characteristics and phase transformation of zirconium dioxide

Marginal adaptation of three-unit fixed partial dentures constructed from pressed ceramic systems

Long-term stability of an injection-molded zirconia bone-level implant: A testing protocol considering aging kinetics and dynamic fatigue

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