Influence of ceramic material, thickness of restoration and cement layer on stress distribution of occlusal veneers

Tribst, João Paulo Mendes; Penteado, Marcela Moreira; Bottino, Marco Antônio

doi:10.1590/1807-3107bor-2018.vol32.0118

Cited by 61 publications

(73 citation statements)

References 38 publications

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“…Other advantages include preserving the pulp vitality, lower hypersensitivity, enabling prediction of the outcome by using temporary restorations, and easy cementation. 5,6 Nonetheless, according to laboratory fatigue tests, crack formation and debonding are the most common causes of failure of occlusal veneer restorations. 4,7 Optimal fracture resistance is one of the most important factors that increases the longevity of a conservative restoration.…”

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confidence: 99%

“…They showed that occlusal veneers had high fatigue resistance. [3][4][5][6]8,[12][13][14] Nonetheless, evaluation of their failure mode revealed some shortcomings that called for further investigations. 15 To the best of the authors' knowledge, no previous study has compared the properties of these restorations with those with a less conservative preparation design.…”

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confidence: 99%

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Effect of Tooth Preparation Design on Fracture Resistance of Zirconia‐Reinforced Lithium Silicate Overlays

Falahchai

Hemmati

Asli

et al. 2020

Journal of Prosthodontics

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Purpose To assess the effect of tooth preparation design on fracture resistance of zirconia‐reinforced lithium silicate overlays. Materials and Methods This study evaluated 50 human maxillary first molars with no caries, restorations or anatomical defects. The teeth were randomly divided into five groups (n = 10/group) based on preparation design for the fabrication of overlay restorations: (O) anatomical occlusal reduction, (OS) anatomical occlusal reduction with round shoulder preparation, (OG) anatomical occlusal reduction with a central groove, (OSG) anatomical occlusal reduction with round shoulder preparation and central groove, and (C) no preparation of tooth (control group). All restorations were fabricated using zirconia‐reinforced lithium silicate (Vita Suprinity). The specimens underwent thermomechanical fatigue loading in a masticatory simulator (1.2 million cycles at 98 N). Fracture resistance was measured using a universal testing machine. The mode of failure was determined as well. Data were analyzed using one‐way ANOVA followed by Tukey's post‐hoc test, paired t‐test and Fisher's exact test (α = 0.05). Results Group O showed significantly higher fracture resistance than groups OG and OSG (p = 0.002 and p = 0.001, respectively). The fracture resistance of group OS was significantly higher than that of group OSG (p = 0.008). The fracture resistance of the control group was significantly higher than that of OG and OSG (p = 0.001) and had no significant difference with other groups. Conclusions Group O (anatomical occlusal reduction alone), which had the most conservative preparation design, yielded the highest fracture resistance.

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confidence: 99%

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confidence: 99%

Effect of Tooth Preparation Design on Fracture Resistance of Zirconia‐Reinforced Lithium Silicate Overlays

Falahchai

Hemmati

Asli

et al. 2020

Journal of Prosthodontics

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“…Occlusal veneers are thin non‐retentive overlays/onlays 2 . The main advantage of this modality is that it reinstates the masticatory function while preserving the tooth structure 7 …”

Section: Introductionmentioning

confidence: 99%

“…2 The main advantage of this modality is that it reinstates the masticatory function while preserving the tooth structure. 7 Marginal adaptation is a fundamental parameter in restoration success. 8 Absence of marginal adaptation may enhance the cement dissolution, and lead to subsequent microleakage, development of secondary caries, periodontal disease, pulpal inflammation, and eventual clinical failure of fixed restorations.…”

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confidence: 99%

“…29 Recently, some investigations were carried out regarding the ceramic occlusal veneers; however, most of them only focused on the mechanical properties of this type of restorations and paid less attention to their biological properties. 2,7,28,[30][31][32][33] However, it is widely accepted that occlusal veneers have high fatigue resistance. 2,7,28,[30][31][32][33] On the other hand, limited studies have addressed the effect of preparation design on the properties of overlay restorations, and the existing ones focused only on the fracture resistance of these restorations.…”

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confidence: 99%

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Marginal adaptation of zirconia‐reinforced lithium silicate overlays with different preparation designs

Falahchai

Hemmati

Asli

et al. 2020

J Esthet Restor Dent

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Objective: Following the advent of strong adhesive bonding, the conservative tooth preparation designs without a retentive form gained increasing popularity. This study aimed to evaluate the marginal adaptation of zirconia-reinforced lithium silicate (ZLS) overlays with different preparation designs. Materials and methods: Forty sound human maxillary first molars were collected and divided into four groups (n = 10) according to their preparation design for the fabrication of ZLS overlays: (O) anatomical occlusal reduction, (OS) anatomical occlusal reduction with rounded shoulder, (OG) anatomical occlusal reduction with a central groove, and (OSG) anatomical occlusal reduction with rounded shoulder and central groove. A video measuring machine (VMM) was used to measure the marginal gap. Statistical analysis was carried out using one-way ANOVA followed by paired t test and Tukey's test (α = .05). Results: The gap size was significantly different between the groups both before (P = .004) and after (P = .008) cementation, and it was significantly smaller in group O than group OSG (P = .002 before and P = .004 after cementation). Marginal gap increased in all groups following cementation (P < .001). Conclusions: Group O showed comparable marginal adaptation with groups OS and OG while group OSG with the most complex design showed the lowest marginal adaptation for ZLS overlays. Clinical Significance: According to the results of this in vitro study, it may be stated that for defect-free teeth requiring occlusal restoration, the occlusal surface preparation alone would suffice to achieve optimal marginal adaptation, and retentive and more invasive preparation designs are not required.

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Strengthening ceramic surfaces with the use of resin cements based on thiourethane oligomers

Correr-Sobrinho

Costa

Fugolin

et al. 2020

J of Applied Polymer Sci

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This study evaluated the effects of thiourethane (TU) additives on the flexural strength (σf) and elastic modulus (Ef) of a resin cement, and on a possible strengthening of ceramic restorations.MethodsTwo TUs (ARomatic and ALiphatic) were added at 0 (control—EC) or 20 wt% to photopolymerizable resin cements. RelyX Ultimate (RU) was the commercial control. Flexural strength (σf) and elastic modulus (Ef) of the cements were measured in three‐point bending (n = 8). Biaxial flexural strength (σbf) of ceramic discs with and without cement layering were determined using a ball‐on‐ring setup. The σbf of cement‐coated specimens was calculated at positions z = 0 (ceramic surface, bonded interface) and z = −t2 (cement surface above ring). Data were analyzed with one‐way ANOVA/Tukey test (α = .05).Resultsσf of AR was significantly higher than for AL and RU, and Ef was lower. The Ef of RU was significantly higher than all other groups. At z = 0, all resin‐coated groups had higher σbf. The σbf of RU, AR, and AL were significantly higher than EC and unfilled resin group. At z = −t2, RU had significantly higher σbf.SignificanceAll resin cements were able to strengthen the ceramic, with the TU‐modified material presenting similar results to the commercial material.

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Influence of ceramic material, thickness of restoration and cement layer on stress distribution of occlusal veneers

Cited by 61 publications

References 38 publications

Effect of Tooth Preparation Design on Fracture Resistance of Zirconia‐Reinforced Lithium Silicate Overlays

Effect of Tooth Preparation Design on Fracture Resistance of Zirconia‐Reinforced Lithium Silicate Overlays

Marginal adaptation of zirconia‐reinforced lithium silicate overlays with different preparation designs

Strengthening ceramic surfaces with the use of resin cements based on thiourethane oligomers

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