Evaluation of the adaptation of zirconia-based fixed partial dentures using micro-CT technology

Borba, Márcia; Miranda, Walter Gomes; César, Paulo Francisco; Griggs, Jason A.; Bona, Álvaro Della

doi:10.1590/s1806-83242013000500003

Cited by 44 publications

(49 citation statements)

References 25 publications

(52 reference statements)

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“…Therefore, the use of a micro-CT may not become a general tool to evaluate marginal integrity of present resin composites but an additional tool valuable in the future to address specific questions, such as volumetric changes associated with new types of restorative materials. Further research areas are the investigation of gap formations in ceramic restorations [23]; comparisons among different parameters such as restorative material, C-factor, and cavity design [27]; the investigation of root canal fillings [40][41][42], glassfiber posts [43], and implants in connection with periimplantitis [44]; and the adaptation of ceramics-fixed partial dentures [45,46].…”

Section: Discussionmentioning

confidence: 99%

Evaluation of microleakage in class V composite restorations using dye penetration and micro-CT

et al. 2015

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Section: Discussionmentioning

confidence: 99%

Evaluation of microleakage in class V composite restorations using dye penetration and micro-CT

et al. 2015

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“…Following Holmes, et al 8 (1989), four locations (centers of the buccal, lingual, mesial, and distal faces) were selected for the evaluation of marginal gaps (MGs) and absolute marginal discrepancy (AMD; Figure 1A). Ten locations on each of the two slice types [four on the axial walls for the evaluation of axial gaps (AGs) and six on the occlusal walls for the evaluation of occlusal gaps (OGs) (Figure 1B)] were used for the evaluation of internal misfit 3,12,13 .…”

Section: Methodsmentioning

confidence: 99%

“…The most commonly accepted value is around 120 μm, but values of 50 μm and 200 μm have also been reported 3,9,15 . Some authors have claimed that thick cement layers may lead to increased cement dissolution, microleakage, localized stress accumulation, and reduction of fracture strength 20,21,28 .…”

Section: Introductionmentioning

confidence: 99%

Misfit and fracture load of implant-supported monolithic crowns in zirconia-reinforced lithium silicate

et al. 2017

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Zirconia-reinforced lithium silicate (ZLS) is a ceramic that promises to have better mechanical properties than other materials with the same indications as well as improved adaptation and fracture strength. Objective In this study, marginal and internal misfit and fracture load with and without thermal-mechanical aging (TMA) of monolithic ZLS and lithium disilicate (LDS) crowns were evaluated.Material and methods Crowns were milled using a computer-aided design/computer-aided manufacturing system. Marginal gaps (MGs), absolute marginal discrepancy (AMD), axial gaps, and occlusal gaps were measured by X-ray microtomography (n=8). For fracture load testing, crowns were cemented in a universal abutment, and divided into four groups: ZLS without TMA, ZLS with TMA, LDS without TMA, and LDS with TMA (n=10). TMA groups were subjected to 10,000 thermal cycles (5-55°C) and 1,000,000 mechanical cycles (200 N, 3.8 Hz). All groups were subjected to compressive strength testing in a universal testing machine at a crosshead speed of 1 mm/min until failure. Student’s t-test was used to examine misfit, two-way analysis of variance was used to analyze fracture load, and Pearson’s correlation coefficients for misfit and fracture load were calculated (α=0.05). The materials were analyzed according to Weibull distribution, with 95% confidence intervals.Results Average MG (p<0.001) and AMD (p=0.003) values were greater in ZLS than in LDS crowns. TMA did not affect the fracture load of either material. However, fracture loads of ZLS crowns were lower than those of LDS crowns (p<0.001). Fracture load was moderately correlated with MG (r=-0.553) and AMD (r=-0.497). ZLS with TMA was least reliable, according to Weibull probability.Conclusion Within the limitations of this study, ZLS crowns had lower fracture load values and greater marginal misfit than did LDS crowns, although these values were within acceptable limits.

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“…After milling, copings were sintered. Marginal and internal adaptation of each coping was measured using the silicone replica technique (18,23,24) and micro-CT imaging (19,(25)(26)(27).…”

Section: Methodsmentioning

confidence: 99%

Marginal and Internal Adaptation of Zirconia Crowns: A Comparative Study of Assessment Methods

et al. 2017

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Marginal and internal adaptation is critical for the success of indirect restorations. New imaging systems make it possible to evaluate these parameters with precision and nondestructively. This study evaluated the marginal and internal adaptation of zirconia copings fabricated with two different systems using both silicone replica and microcomputed tomography (micro-CT) assessment methods. A metal master model, representing a preparation for an all-ceramic full crown, was digitally scanned and polycrystalline zirconia copings were fabricated with either Ceramill Zi (Amann-Girrbach) or inCoris Zi (Dentslpy-Sirona), n=10. For each coping, marginal and internal gaps were evaluated by silicone replica and micro-CT assessment methods. Four assessment points of each replica cross-section and micro-CT image were evaluated using imaging software: marginal gap (MG), axial wall (AW), axio-occlusal angle (AO) and mid-occlusal wall (MO). Data were statistically analyzed by factorial ANOVA and Tukey test (α=0.05). There was no statistically significant difference between the methods for MG and AW. For AO, there were significant differences between methods for Amann copings, while for Dentsply-Sirona copings similar values were observed. For MO, both methods presented statistically significant differences. A positive correlation was observed determined by the two assessment methods for MG values. In conclusion, the assessment method influenced the evaluation of marginal and internal adaptation of zirconia copings. Micro-CT showed lower marginal and internal gap values when compared to the silicone replica technique, although the difference was not always statistically significant. Marginal gap and axial wall assessment points showed the lower gap values, regardless of ceramic system and assessment method used.

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Evaluation of the adaptation of zirconia-based fixed partial dentures using micro-CT technology

Cited by 44 publications

References 25 publications

Evaluation of microleakage in class V composite restorations using dye penetration and micro-CT

Evaluation of microleakage in class V composite restorations using dye penetration and micro-CT

Misfit and fracture load of implant-supported monolithic crowns in zirconia-reinforced lithium silicate

Marginal and Internal Adaptation of Zirconia Crowns: A Comparative Study of Assessment Methods

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