All-ceramic partial coverage restorations—Midterm results of a 5-year prospective clinical splitmouth study

Guess, Petra C.; Strub, Jörg Rudolf; Steinhart, Niclas; Wolkewitz, Martin; Stappert, Christian F.J.

doi:10.1016/j.jdent.2009.04.006

Cited by 79 publications

(56 citation statements)

References 38 publications

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“…Several studies have shown that marginal defects are frequently present in indirect restorations. [18][19][20] The results of this study showed strategies, such as delayed light activation, that may help reduce polymerization stress and, ultimately, reduce marginal defects. The delay period used in this study was chosen because it is clinically feasible.…”

Section: Discussionmentioning

confidence: 74%

“…3,13 Unfortunately, a higher degree of conversion is also related to an increase in polymerization shrinkage stress. [14][15][16] If stress exceeds the bond strength between the dental substrate and the adhesive system, a contraction gap will be formed, [17][18][19][20] jeopardizing the longevity of the restoration. It has been demonstrated that lower polymerization rate 21,22 and lower elastic modulus [22][23][24][25] may help reduce polymerization stress.…”

Section: Introductionmentioning

confidence: 99%

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Effect of Immediate or Delayed Light Activation on Curing Kinetics and Shrinkage Stress of Dual-Cure Resin Cements

Faria-e-Silva¹,

Boaro²,

Braga³

et al. 2011

Operative Dentistry

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A Faria-e-Silva L Boaro R Braga E Piva V Arias L Martins Clinical RelevanceUnder clinical conditions, delayed light activation of dual-cured resin cements may be advantageous in order to reduce shrinkage stress. SUMMARYObjectives: This study evaluated the effect of light activation (absence, immediate, or delayed) on conversion kinetics and polymerization stress of three commercial dual-cured resin cements (Enforce, RelyX ARC, and Panavia F). Methods: Degree of conversion (DC) was monitored for 30 minutes using real-time nearFourier transform infrared spectroscopy. The cement was mixed, placed on the spectrometer sample holder, and light activated either immediately or after five minutes (delayed light activation). When no light activation was performed, the materials were protected from light exposure (control). DC was evaluated at five and 30 minutes postmixture. Maximum rates of polymerization (Rp max ) were obtained from the first derivative of the DC vs time curve. Polymerization stress was monitored for 30 minutes in 1-mm-thick specimens inserted between two cylinders attached to a uni-

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Section: Discussionmentioning

confidence: 74%

Section: Introductionmentioning

confidence: 99%

Effect of Immediate or Delayed Light Activation on Curing Kinetics and Shrinkage Stress of Dual-Cure Resin Cements

Faria-e-Silva¹,

Boaro²,

Braga³

et al. 2011

Operative Dentistry

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“…26 While short-term and medium-term clinical data on lithium-disilicate restorations are promising, long-term data are still sparse. 27,28 …”

Section: Introductionmentioning

confidence: 99%

Influence of preparation design and ceramic thicknesses on fracture resistance and failure modes of premolar partial coverage restorations

Guess

Schultheis

Wolkewitz³

et al. 2013

The Journal of Prosthetic Dentistry

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119

105

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Statement of problem Preparation designs and ceramic thicknesses are key factors for the long-term success of minimally invasive premolar partial coverage restorations. However, only limited information is presently available on this topic. Purpose The aim of this in vitro study was to evaluate the fracture resistance and failure modes of ceramic premolar partial coverage restorations with different preparation designs and ceramic thicknesses. Material and methods Caries-free human premolars (n= 144) were divided into 9 groups. Palatal onlay preparation comprised reduction of the palatal cusp by 2 mm (Palatal-Onlay-Standard), 1 mm (Palatal-Onlay-Thin), or 0.5 mm (Palatal-Onlay-Ultra-Thin). Complete-coverage onlay preparation additionally included the buccal cusp (Occlusal-Onlay-Standard; Occlusal-Onlay-Thin; Occlusal-Onlay-Ultra-Thin). Labial surface preparations with chamfer reductions of 0.8 mm (Complete-Veneer-Standard), 0.6 mm (Complete-Veneer-Thin) and 0.4 mm (Complete-Veneer-Ultra-Thin) were implemented for complete veneer restorations. Restorations were fabricated from a pressable lithium-disilicate ceramic (IPS-e.max-Press) and cemented adhesively (Syntac-Classic/Variolink-II). All specimens were subjected to cyclic mechanical loading (F= 49 N, 1.2 million cycles) and simultaneous thermocycling (5°C to 55°C) in a mouth-motion simulator. After fatigue, restorations were exposed to single-load-to-failure. Two-way ANOVA was used to identify statistical differences. Pair-wise differences were calculated and P-values were adjusted by the Tukey–Kramer method (α= .05). Results All specimens survived fatigue. Mean (SD) load to failure values (N) were as follows: 837 (320/Palatal-Onlay-Standard), 1055 (369/Palatal-Onlay-Thin), 1192 (342/Palatal-Onlay-Ultra-Thin), 963 (405/Occlusal-Onlay-Standard), 1108 (340/Occlusal-Onlay-Thin), 997 (331/Occlusal-Onlay-Ultra-Thin), 1361 (333/Complete-Veneer-Standard), 1087 (251/Complete-Veneer-Thin), 883 (311/Complete-Veneer-Ultra-Thin). Palatal-onlay restorations revealed a significantly higher fracture resistance with ultra-thin thicknesses than with standard thicknesses (P=.015). Onlay restorations were not affected by thickness variations. Fracture loads of standard complete veneers were significantly higher than thin (P=.03) and ultra-thin (P<.001) restorations. Conclusions In this in vitro study, the reduction of preparation depth to 1.00 and 0.5 mm did not impair fracture resistance of pressable lithium-disilicate ceramic onlay restorations but resulted in lower failure loads in complete veneer restorations on premolars.

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“…7 Although the ML is a non-centric holding cusp from a static occlusion perspective, eccentric movements in a group function occlusal scheme may encompass the inner inclines of the lingual cusp in mandibular posterior teeth, 6 as simulated in the present study (ML cusp), and as possibly being the case in several clinical prospective studies depicting chip-off fractures in the lingual cusp of mandibular allceramic as well as metal-ceramic posterior restorations. 18,19,23,24 This suggests that fatigue testing in both lingual and buccal cusps may be clinically relevant. As observed in clinical studies, the chip-off fractures are related to occlusal wear which was simulated in the present investigation by indenter sliding.…”

Section: Discussionmentioning

confidence: 99%

Failure modes of Y-TZP crowns at different cusp inclines

Bonfante

Sailer

Silva

et al. 2010

Journal of Dentistry

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All-ceramic partial coverage restorations—Midterm results of a 5-year prospective clinical splitmouth study

Cited by 79 publications

References 38 publications

Effect of Immediate or Delayed Light Activation on Curing Kinetics and Shrinkage Stress of Dual-Cure Resin Cements

Effect of Immediate or Delayed Light Activation on Curing Kinetics and Shrinkage Stress of Dual-Cure Resin Cements

Influence of preparation design and ceramic thicknesses on fracture resistance and failure modes of premolar partial coverage restorations

Failure modes of Y-TZP crowns at different cusp inclines

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