Light curing through glass ceramics: effect of curing mode on micromechanical properties of dual-curing resin cements

Flury, Simon; Lussi, Adrian; Hickel, Reinhard; Ilie, Nicoleta (2014). Light curing through glass ceramics: effect of curing mode on micromechanical properties of dual-curing resin cements. Clinical oral investigations, 18(3), pp. 809-818. Springer 10.1007/s00784-013-1051-y

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OBJECTIVES The aim of this study was to investigate micromechanical properties of five dual-curing resin cements after different curing modes including light curing through glass ceramic materials. MATERIALS AND METHODS Vickers hardness (VH) and indentation modulus (Y HU) of Panavia F2.0, RelyX Unicem 2 Automix, SpeedCEM, BisCem, and BeautiCem SA were measured after 1 week of storage (37 °C, 100 % humidity). The resin cements were tested following self-curing or light curing with the second-generation light-emitting diode (LED) curing unit Elipar FreeLight 2 in Standard Mode (1,545 mW/cm(2)) or with the third-generation LED curing unit VALO in High Power Mode (1,869 mW/cm(2)) or in XtraPower Mode (3,505 mW/cm(2)). Light curing was performed directly or through glass ceramic discs of 1.5 or 3 mm thickness of IPS Empress CAD or IPS e.max CAD. VH and Y HU were analysed with Kruskal-Wallis tests followed by pairwise Wilcoxon rank sum tests (α = 0.05). RESULTS RelyX Unicem 2 Automix resulted in the highest VH and Y HU followed by BeautiCem SA, BisCem, SpeedCEM, and finally Panavia F2.0. Self-curing of RelyX Unicem 2 Automix and SpeedCEM lowered VH and Y HU compared to light curing whereas self-curing of Panavia F2.0, BisCem, and BeautiCem SA led to similar or significantly higher VH and Y HU compared to light curing. Generally, direct light curing resulted in similar or lower VH and Y HU compared to light curing through 1.5-mm-thick ceramic discs. Light curing through 3-mm-thick discs of IPS e.max CAD generally reduced VH and Y HU for all resin cements except SpeedCEM, which was the least affected by light curing through ceramic discs. CONCLUSIONS The resin cements responded heterogeneously to changes in curing mode. The applied irradiances and light curing times adequately cured the resin cements even through 1.5-mm-thick ceramic discs. CLINICAL RELEVANCE When light curing resin cements through thick glass ceramic restorations, clinicians should consider to prolong the light curing times even with LED curing units providing high irradiances.

Item Type:

Journal Article (Original Article)

Division/Institute:

04 Faculty of Medicine > School of Dental Medicine > Department of Preventive, Restorative and Pediatric Dentistry

UniBE Contributor:

Flury, Simon and Lussi, Adrian

Subjects:

600 Technology > 610 Medicine & health

ISSN:

1432-6981

Publisher:

Springer

Language:

English

Submitter:

Simon Flury

Date Deposited:

18 Dec 2013 10:17

Last Modified:

12 Jan 2015 11:04

Publisher DOI:

10.1007/s00784-013-1051-y

PubMed ID:

23929361

Uncontrolled Keywords:

Luting resins, Polymerization, Light intensity, Radiant exposure, Surface hardness, Indentation modulus

BORIS DOI:

10.7892/boris.39331

URI:

https://boris.unibe.ch/id/eprint/39331

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