Effects of Liner-Bonding of Implant-Supported Glass–Ceramic Crown to Zirconia Abutment on Bond Strength and Fracture Resistance

Jang, Yong-Seok; Oh, Sang-Hoon; Oh, Won-Suck; Lee, Jung‐Jin; Bae, Tae‐Sung

doi:10.3390/ma12172798

Cited by 7 publications

(4 citation statements)

References 41 publications

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“…Additionally, zirconia has been tested recently concerning its mechanical properties. The bond strength [30], hardness [31], and wear [32] tests have been performed on this material, showing excellent mechanical properties.…”

Section: Introductionmentioning

confidence: 99%

Optical and Mechanical Properties of Highly Translucent Dental Zirconia

Kim

2020

Materials

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The aim was to evaluate the translucency, opalescence, and fluorescence of highly translucent zirconia, lithium disilicate, and bovine teeth. One mm-thick specimens of five monolithic zirconia systems, two glass-ceramics, and bovine enamel/dentin were investigated. A spectrophotometer (Ci7600) was used to measure the CIELab color coordinates, and the translucency and opalescence values were obtained. For evaluating the fluorescence emission, the differences in spectral reflectance by the UV component of illumination were calculated. The microstructures of ceramic specimens were examined with a scanning electron microscope and the chemical compositions were determined with an X-ray fluorescence spectrometer. Mechanical properties were appraised with three-point bending strength, indentation fracture toughness, and Vickers hardness. Data were analyzed using a one-way ANOVA, followed by Tukey’s multiple comparison test (α = 0.05). A higher yttria content (5 mol%) significantly improved the translucency of zirconia ceramics, while they were less translucent than lithium disilicate (p < 0.05). Lowering the alumina content below 0.05 wt.% enhanced the translucency (p < 0.05), but a small amount of alumina was still required to obtain full densification. 0.05 wt.% Fe was used to increase the chroma of zirconia specimens without compromising their mechanical properties. The Er-containing zirconia specimen showed a maximal fluorescence emission at 430 nm. The degree of opalescence was affected by the microstructures of ceramic materials. The microstructure, incorporation of a secondary phase, and sintering behavior can have a strong impact on the final mechanical and optical properties of dental ceramics. Addition of small amounts of metal oxides can affect the translucency, opalescence or fluorescence qualities of zirconia

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Section: Introductionmentioning

confidence: 99%

Optical and Mechanical Properties of Highly Translucent Dental Zirconia

Kim

2020

Materials

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“…CAD/CAM systems have shown sufficient reliability in the realization of adhesive restorations in aesthetic areas [12][13][14][15]; in particular, a recent study [16] demonstrated that milled esthetic mock-ups are much more consistent than those obtained with manual procedure. For instance, the construction of a prototype, based on the virtual assembly, reduces the number of errors in the final product and can represent a fundamental tool for aesthetic rehabilitations and/or prosthetic-driven surgery [16].…”

Section: Introductionmentioning

confidence: 99%

The step further smile virtual planning: milled versus prototyped mock-ups for the evaluation of the designed smile characteristics

et al. 2020

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Background: Mock-up based approach allows the preview of the aesthetic rehabilitation, however, it is crucial that the mock-up does not differ from the expected aesthetic outcomes. With CAD-CAM technologies, it is possible to directly create mock-ups from virtual planned smile project, with greater accuracy and efficiency compared to the conventional moulded mock-ups. In this study, we investigated the trueness of mock-ups obtained with milling and 3D printing technology and a full digital work-flow system. Methods: Ten adults subjects were included and digital smile design/digital wax-up were performed to enhance the aesthetic of maxillary anterior region. Ten milled mock-ups and 10 prototyped mock-ups were obtained from the original .stl file and a digital analysis of trueness was carried out by superimposing the scanned-milled mockups and the scanned-prototyped mock-ups to the digital wax-up, according to the surface-to-surface matching technique. Specific linear measurements were performed to investigate and compare the dimensional characteristics of the physical manufactures, the 3D project and the scanned mock-ups. All data were statistically analyzed. A clinical test was also performed to assess the fitting of the final manufacture. Results: The prototyped mock-ups showed a significant increment of the transversal measurements (p < 0.001) while the milled mock-ups showed a significant increment of all vertical and transversal measurements (p < 0.001). The prototyped mock-ups showed good fitting after clinical tests while none of the milled mock-ups showed good adaptation (no fitting or significant clinical compensation required). Deviation analysis from the original 3D project reported a greater matching percentage for the scanned-milled mock-ups (80,31% ± 2.50) compared to the scanned-prototyped mock-ups (69,17% ± 2.64) (p < 0.001). This was in contrast with the findings from linear measurements as well as from the clinical test and may have been affected by a reductive algorithmic computation after digitization of physical mock-ups.

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“…However, an even preparation taking into account the pulp and tooth anatomy can be difficult with a CAD/CAM system. Additionally, CAD/CAM dental materials have been tested recently concerning hardness [ 34 ], bond strength [ 35 ] and wear [ 36 ], showing their mechanical behavior under ideal laboratory conditions. A CAD/CAM processible material that resembles human teeth in mechanical properties would eliminate the need for extracted teeth and their not standardized preparation for such testing.…”

Section: Introductionmentioning

confidence: 99%

Fracture Load of CAD/CAM Feldspathic Crowns Influenced by Abutment Material

et al. 2020

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In vitro studies investigating the mechanical properties of dental reconstructions use various materials to replicate prepared teeth. However, no uniform recommendation exists as to which material is most suitable for standardized testing. The purpose of this study was to identify a material that resembles human dentin in fracture load tests. Sixteen human teeth were scanned with an intraoral scanner to obtain copies of the original crown morphology and were then prepared for crowns. Replica dies of the prepared teeth including the root morphology were fabricated with a Computer-aided design and computer-aided manufacturing (CAD/CAM) system and divided into four groups: (A) reinforced composite (RC); (B) human dentin (HD); (C) polymethyl methacrylate (PM); and (D) hybrid ceramic (HC). Sixty-four feldspar ceramic crowns were designed with the biocopy mode, fabricated with a CAD/CAM system, luted on the dies, and then with the roots embedded in polymethyl methacrylate. Care was taken to position all specimens of the same morphology identically. Thermo-mechanical load cycling was performed in a chewing simulator followed by fractural loading of the crowns. A mixed effect linear model was fitted to the data, and pairwise contrasts were estimated on the marginal means and corrected for multiple testing according to Tukey (α = 0.05). The means for fracture load (N) were 2435 N (95% CI (2162, 2709)) for hybrid ceramic, 1838 N (95% CI (1565, 2112)) for reinforced composite, 1670 N (95% CI (1396, 1943)) for human tooth and 1142 N (95% CI (868, 1415)) for polymethyl methacrylate abutment materials. Post-hoc pairwise contrasts revealed a statistically significant (p < 0.05) difference among all groups except for reinforced composite and human dentin (p = 0.76). The results indicate that the mechanical properties of abutment dies play a significant role for a possible substitution of natural teeth in in vitro studies.

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Effects of Liner-Bonding of Implant-Supported Glass–Ceramic Crown to Zirconia Abutment on Bond Strength and Fracture Resistance

Cited by 7 publications

References 41 publications

Optical and Mechanical Properties of Highly Translucent Dental Zirconia

Optical and Mechanical Properties of Highly Translucent Dental Zirconia

The step further smile virtual planning: milled versus prototyped mock-ups for the evaluation of the designed smile characteristics

Fracture Load of CAD/CAM Feldspathic Crowns Influenced by Abutment Material

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