The effect of margin thickness, degree of convergence and bonding interlayer on the marginal failure of glass-simulated all-ceramic crowns

Sornsuwan, Tanapon; Swain, Michael V.

doi:10.1016/j.actbio.2012.08.006

Cited by 16 publications

(11 citation statements)

References 37 publications

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“…The dentin has a Poisson ratio of approximately 0.3, which may cause bulging or distortion of the dentine cervically during occlusal loading . Ceramics are weak in tension and the expanding dentin may create sufficient tensile stress to cause core fracture . Furthermore, high cementation force or excess cement inside the crown may induce an unfavorable stress distribution .…”

Section: Discussionmentioning

confidence: 99%

Fractographic features of glass‐ceramic and zirconia‐based dental restorations fractured during clinical function

Øilo

Hardang

Ulsund

et al. 2014

European J Oral Sciences

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Fractures during clinical function have been reported as the major concern associated with all-ceramic dental restorations. The aim of this study was to analyze the fracture features of glass-ceramic and zirconia-based restorations fractured during clinical use. Twenty-seven crowns and onlays were supplied by dentists and dental technicians with information about type of cement and time in function, if available. Fourteen lithium disilicate glass-ceramic restorations and 13 zirconia-based restorations were retrieved and analyzed. Fractographic features were examined using optical microscopy to determine crack initiation and crack propagation of the restorations. The material comprised fractured restorations from one canine, 10 incisors, four premolars, and 11 molars. One crown was not categorized because of difficulty in orientation of the fragments. The results revealed that all core and veneer fractures initiated in the cervical margin and usually from the approximal area close to the most coronally placed curvature of the margin. Three cases of occlusal chipping were found. The margin of dental all-ceramic single-tooth restorations was the area of fracture origin. The fracture features were similar for zirconia, glass-ceramic, and alumina single-tooth restorations. Design features seem to be of great importance for fracture initiation.

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Section: Discussionmentioning

confidence: 99%

Fractographic features of glass‐ceramic and zirconia‐based dental restorations fractured during clinical function

Øilo

Hardang

Ulsund

et al. 2014

European J Oral Sciences

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“…In the last years, several scholars have warned about the importance of crown geometry and loading directions on the distribution of stresses developing within a tooth during occlusal loadings [12,28,47]. Knowledge of these effects has obvious implications not only for the understanding of the relation between functional biomechanics and tooth morphology in an adaptive and evolutionary context [12], but also for modern dentistry to appropriately design the architecture and shape of artificial crowns and to test materials for tooth restoration [14].…”

Section: Discussionmentioning

confidence: 99%

Unravelling the Functional Biomechanics of Dental Features and Tooth Wear

et al. 2013

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Most of the morphological features recognized in hominin teeth, particularly the topography of the occlusal surface, are generally interpreted as an evolutionary functional adaptation for mechanical food processing. In this respect, we can also expect that the general architecture of a tooth reflects a response to withstand the high stresses produced during masticatory loadings. Here we use an engineering approach, finite element analysis (FEA), with an advanced loading concept derived from individual occlusal wear information to evaluate whether some dental traits usually found in hominin and extant great ape molars, such as the trigonid crest, the entoconid-hypoconulid crest and the protostylid have important biomechanical implications. For this purpose, FEA was applied to 3D digital models of three Gorilla gorilla lower second molars (M2) differing in wear stages. Our results show that in unworn and slightly worn M2s tensile stresses concentrate in the grooves of the occlusal surface. In such condition, the trigonid and the entoconid-hypoconulid crests act to reinforce the crown locally against stresses produced along the mesiodistal groove. Similarly, the protostylid is shaped like a buttress to suffer the high tensile stresses concentrated in the deep buccal groove. These dental traits are less functional in the worn M2, because tensile stresses decrease physiologically in the crown with progressing wear due to the enlargement of antagonistic contact areas and changes in loading direction from oblique to nearly parallel direction to the dental axis. This suggests that the wear process might have a crucial influence in the evolution and structural adaptation of molars enabling to endure bite stresses and reduce tooth failure throughout the lifetime of an individual.

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“…Preparation of the ceramic intaglios’ surface with hydrofluoric acid, silanisation and bonding agent, as performed in this study, has been found to efficiently prepare the restorations’ surface for bonding (25). The resin strengthening effect provided by bonding to porcelain has been previously explained by a bridging or crack healing effect by either strong bonding of the resin to the ceramic surface or the silane molecules entering the crack (26-28). …”

Section: Discussionmentioning

confidence: 99%

Luting of ceramic crowns with a self-adhesive cement: Effect of contamination on marginal adaptation and fracture strength

Slavcheva

Krejci²,

Bortolotto³

2013

Med Oral

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Objectives: This study evaluated the percentages of continuous margins (%CM) and fracture strength (FS) of crowns made out from blocs of leucite-reinforced ceramic (IPS Empress CAD) and luted with a representative self-adhesive cement (RelyX Unicem) under four contaminating agents: saliva, water, blood, a haemostatic solution containing aluminium chloride (pH= 0.8) and a control group with no contamination. Study Design: %CM at both tooth-cement (TC) and cement-crown (CC) interfaces were determined before and after a fatigue test consisting of 600’000 chewing loads and 1’500 temperature cycles changing from 5º C to 50º C. Load to fracture was recorded on fatigued specimens. Kruskal-Wallis test was used to compare %CM and FS between the five groups with a level of confidence of 95%. Results: At the TC interface, no significant differences in marginal adaptation before loading could be detected between groups. After loading, a significant marginal degradation was observed in the group contaminated with aluminium chloride (52 ± 22 %CM) in respect to the other groups. No significant differences in %CM could be detected between the groups contaminated with saliva, water, blood and the control. At the CC interface, no significant differences in marginal adaptation were observed between the groups. The FS on loaded specimens was around 1637N, with no significant differences between groups as well. Conclusions: An adverse interaction of the highly acidic haemostatic agent with either dentin or the self-adhesive cement could explain the specimens’ marginal degradation. The self-adhesive cement tested in this study was no sensitive to moisture contamination either with saliva, water or blood. Key words:Marginal adaptation, RelyX Unicem, contamination, all-ceramic crowns.

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The effect of margin thickness, degree of convergence and bonding interlayer on the marginal failure of glass-simulated all-ceramic crowns

Cited by 16 publications

References 37 publications

Fractographic features of glass‐ceramic and zirconia‐based dental restorations fractured during clinical function

Fractographic features of glass‐ceramic and zirconia‐based dental restorations fractured during clinical function

Unravelling the Functional Biomechanics of Dental Features and Tooth Wear

Luting of ceramic crowns with a self-adhesive cement: Effect of contamination on marginal adaptation and fracture strength

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