International Journal of Prosthodontics and Restorative Dentistry

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VOLUME 9 , ISSUE 2 ( April-June, 2019 ) > List of Articles

Original Article

Impact of Overdried Preparation and Thermocycling on the Fracture of CAD–CAM Hybrid Ceramic Occlusal Veneer Restorations

Paul D Edgerley, Antheunis Versluis, Daranee Tantbirojn, David R Cagna

Keywords : Fracture, Laboratory research, Occlusal veneers, Self-adhesive resin cement, Strength, Thermocycling

Citation Information : Edgerley PD, Versluis A, Tantbirojn D, Cagna DR. Impact of Overdried Preparation and Thermocycling on the Fracture of CAD–CAM Hybrid Ceramic Occlusal Veneer Restorations. Int J Prosthodont Restor Dent 2019; 9 (2):38-42.

DOI: 10.5005/jp-journals-10019-1231

License: CC BY-NC 4.0

Published Online: 01-10-2019

Copyright Statement:  Copyright © 2019; The Author(s).


Abstract

Aim: To study the impact of overdried preparations prior to cementation with a self-adhesive resin cement and thermocycling on the fracture of hybrid ceramic occlusal veneer restorations. Materials and methods: Sixty extracted maxillary molars were mounted and sectioned to remove the coronal structure 4 mm above the cementoenamel junction, leaving a flat area of exposed dentin and peripheral enamel. Ultrathin occlusal veneers with 0.3 mm central fossa thickness were milled from CAD–CAM hybrid ceramic (Vita Enamic). Teeth were randomly divided into three groups. After a selective enamel etching with phosphoric acid, groups I and II were blot-dried using cotton pellets; group III was desiccated with pressurized air for 15 seconds prior to cementation with a self-adhesive resin cement (Rely-X Unicem). Groups II and III were thermocycled between 5/55°C for 5000 cycles. The restored teeth were loaded axially until fracture. Fracture patterns were classified as fracture in the veneers only or fracture involving the tooth structure. Results: The fracture strengths (mean ± standard deviation) were 1672 ± 585, 1789 ± 722, and 1586 ± 711 N for groups I (control), II (thermocycled), and III (overdried and thermocycled), respectively. No statistically significant differences were indicated (one-way ANOVA, p = 0.6426). Fracture patterns were significantly different (the Kruskal–Wallis rank sum test for multiple independent samples, p = 0.01315, followed by the Dunn post hoc test), where group III had more fractures in the veneer only than groups I and II. Conclusion: Thermocycling of samples and overdrying of preparations did not show a significant difference in failure strength. However, fracture patterns indicated more veneer-only fractures under desiccated conditions, suggesting compromised restoration bonding.


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  1. Abrahamsen TC. The worn dentition - pathognomonic patterns of abrasion and erosion. Int Dent J 2005;55(4 Suppl 1):268–276. DOI: 10.1111/j.1875-595X.2005.tb00064.x.
  2. Van't Spijker A, Rodriguez JM, et al. Prevalence of tooth wear in adults. Int J Prosthodont 2009;22(1):35–42.
  3. Turner KA, Missirlian DM. Restoration of the extremely worn dentition. J Prosthet Dent 1984;52(4):467–474. DOI: 10.1016/0022-3913(84)90326-3.
  4. Hellsing G. Functional adaptation to changes in vertical dimension. J Prosthet Dent 1984;52(6):867–870. DOI: 10.1016/S0022-3913(84) 90001-5.
  5. Fayz F, Eslami A. Determination of occlusal vertical dimension: a literature review. J Prosthet Dent 1988;59(3):321–323. DOI: 10.1016/0022-3913(88)90182-5.
  6. Edelhoff D, Liebermann A, et al. Minimally invasive treatment options in fixed prosthodontics. Quintessence Int 2016;47(3):207–216. DOI: 10.3290/j.qi.a35115.
  7. Johnson AC, Versluis A, et al. Fracture strength of CAD/CAM composite and composite-ceramic occlusal veneers. J Prosthodont Res 2014;58(2):107–114. DOI: 10.1016/j.jpor.2014.01.001.
  8. Egbert JS, Johnson AC, et al. Fracture strength of ultrathin occlusal veneer restorations made from CAD/CAM composite or hybrid ceramic materials. Oral Sci Int 2015;12(2):53–58. DOI: 10.1016/S1348-8643(15)00017-8.
  9. Magne P, Stanley K, et al. Modeling of ultrathin occlusal veneers. Dent Mater 2012;28(7):777–782. DOI: 10.1016/j.dental.2012.04.002.
  10. Angerame D, De Biasi M, et al. Influence of preparation designs on marginal adaptation and failure load of full-coverage occlusal veneers after thermomechanical aging simulation. J Esthet Restor Dent 2019; 31(3):280–289. DOI: 10.1111/jerd.12457.
  11. Al-Akhali M, Chaar MS, et al. Fracture resistance of ceramic and polymer-based occlusal veneer restorations. J Mech Behav Biomed Mater 2017;74:245–250. DOI: 10.1016/j.jmbbm.2017.06.013.
  12. Ioannidis A, Mühlemann S, et al. Ultra-thin occlusal veneers bonded to enamel and made of ceramic or hybrid materials exhibit load-bearing capacities not different from conventional restorations. J Mech Behav Biomed Mater 2019;90:433–440. DOI: 10.1016/j.jmbbm.2018.09.041.
  13. Coldea A, Swain MV, et al. Mechanical properties of polymer-infiltrated ceramic-network materials. Dent Mater 2013;29(4):419–426. DOI: 10.1016/j.dental.2013.01.002.
  14. Della Bona A, Corazza PH, et al. Characterization of a polymer-infiltrated ceramic-network material. Dent Mater 2014;30(5):564–569. DOI: 10.1016/j.dental.2014.02.019.
  15. He LH, Swain M. A novel polymer infiltrated ceramic dental material. Dent Mater 2011;27(6):527–534. DOI: 10.1016/j.dental.2011. 02.002.
  16. Radovic I, Monticelli F, et al. Self-adhesive resin cements: a literature review. J Adhes Dent 2008;10(4):251–258.
  17. Yoon SY, Park SH, et al. Effect of dentin surface wetness on tensile bond strength of self-adhesive resin cements. J Korean Acad Conserv Dent 2009;34(2):113–119. DOI: 10.5395/JKACD.2009.34.2.113.
  18. Mazzitelli C, Monticelli F, et al. Effect of simulated pulpal pressure on self-adhesive cements bonding to dentin. Dent Mater 2008;24(9):1156–1163. DOI: 10.1016/j.dental.2008.01.005.
  19. Guarda GB, Gonalves LS, et al. Luting glass ceramic restorations using a self-adhesive resin cement under different dentin conditions. J Appl Oral Sci 2010;18(3):244–248. DOI: 10.1590/S1678-77572010000300008.
  20. De Munck J, Vargas M, et al. Bonding of an auto-adhesive luting material to enamel and dentin. Dent Mater 2004;20(10):963–971. DOI: 10.1016/j.dental.2004.03.002.
  21. Ehlers V, Kampf G, et al. Effect of thermocycling with or without 1 year of water storage on retentive strengths of luting cements for zirconia crowns. J Prosthet Dent 2015;113(6):609–615. DOI: 10.1016/j.prosdent.2014.12.001.
  22. Blatz MB, Sadan A, et al. In vitro evaluation of shear bond strengths of resin to densely-sintered high-purity zirconium-oxide ceramic after long-term storage and thermal cycling. J Prosthet Dent 2004;91(4):356–362. DOI: 10.1016/j.prosdent.2004.02.001.
  23. Wegner SM, Gerdes W, et al. Effect of different artificial aging conditions on ceramic-composite bond strength. Int J Prosthodont 2002;15(3):267–272.
  24. Lüthy H, Loeffel O, et al. Effect of thermocycling on bond strength of luting cements to zirconia ceramic. Dent Mater 2006;22(2):195–200. DOI: 10.1016/j.dental.2005.04.016.
  25. McHorris WH. Occlusal adjustment via selective cutting of natural teeth. J Gnathol 1997;16(1):37–51.
  26. Koolstra JH, Van Eijden T, et al. A three-dimensional mathematical model of the human masticatory system predicting maximum possible bite forces. J Biomechanics 1988;21(7):563–576. DOI: 10.1016/0021-9290(88)90219-9.
  27. Piwowarczyk A, Bender R, et al. Long-term bond between dual-polymerizing cementing agents and human hard dental tissue. Dent Mater 2007;23(2):211–217. DOI: 10.1016/j.dental.2006.01.012.
  28. Kikuchi M, Korioth TWP, et al. The association among occlusal contacts, clenching effort, and bite force distribution in man. J Dent Res 1997;76(6):1316–1325. DOI: 10.1177/00220345970760061201.
  29. Morresi A, D'Amario M, et al. Thermal cycling for restorative materials: Does a standardized protocol exist in laboratory testing? A literature review. J Mech Behav Biomed Mat 2014;29:295–308. DOI: 10.1016/j.jmbbm.2013.09.013.
  30. Guidance on Testing of Adhesion to Tooth Structure. ISO/TR 11405 Dental Materials, International Standards Organization; 1994. pp. 1–14.
  31. McHorris WH. Occlusion with particular emphasis on the functional and parafunctional role of anterior teeth. Part 2. J Clin Orthod 1979;13(10):684–701.
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