The flexural strength of CAD/CAM polymer crowns and the effect of artificial ageing on the fracture resistance of CAD/CAM polymer and ceramic single crowns

Winter, Anna; Schurig, Axel; Rasche, Engelke; Rösner, Franziska; Kanus, Lisa; Schmitter, Marc

doi:10.1007/s10856-019-6347-2

Cited by 10 publications

(6 citation statements)

References 34 publications

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“…The fracture resistance of the artificially aged samples was significantly lower compared to the non-aged counterparts, implying that TMA had an impact on the fracture resistance. This is in accordance with previous studies on dentine ( 19 , 34 ) as well as indirect restorations ( 35 ). After aging, the maximum force to fracture was higher for teeth restored with RSR, followed by COMP and lastly the unrestored teeth (NR).…”

Section: Discussionsupporting

confidence: 93%

Comparison of Reverse Sandwich Restorations Versus Composite Fillings for the Restoration of External Cervical Resorptions: An In-Vitro Study

VINOTHKUMAR

2024

Eur Endod J

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Objective The aim was to compare the “reverse sandwich restoration” to resin composite restorations regarding marginal adaptation, fracture resistance, favourable/unfavourable fractures in the management of external cervical resorption. Methods Forty-eight extracted maxillary central incisors were selected and endodontically treated. Cervical regions of the labial root surfaces received simulated resorptive defects and were restored as three randomly allocated groups: Reverse Sandwich Restoration (resin composite + resin-modified glass ionomer) (RSR); resin composite restoration (COMP), and no restoration (NR). Each group was further divided into two subgroups (n=8 each): Thermomechanical Aging (TA) (equivalent to one year) and No Aging (NA). Marginal adaptation was scored by scanning electron microscopy. Fracture resistance was tested using a universal testing machine. Favourable versus unfavourable fractures were classified based on fracture extent. Results TA decreased the marginal adaptation for both RSR and COMP. Mean fracture resistance per groups were: RSR-NA 1522.4±94.9N, RSR-TA 939.6±72.9N, COMP-NA 1197.6±95.7N, COMP-TA 870.4±86.3N, NR-NA 1057.1±88.1N, and NR-TA 836.6±81.9N, respectively. Fracture resistance was the highest for RSR-NA compared to all other groups (p<0.05). TA decreased the fracture resistance in all groups (p<0.05), there was no significant difference between RSR and COMP regarding fracture resistance and favourable/unfavourable fractures (p>0.05). Conclusion RSR provided comparable results to resin composite fillings to restore artificial cervical defects pertaining to marginal adaptation, fracture resistance, and favourable versus unfavourable fractures. RSR is preferable due to its inherent biocompatibility to the periodontium.

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Section: Discussionsupporting

confidence: 93%

Comparison of Reverse Sandwich Restorations Versus Composite Fillings for the Restoration of External Cervical Resorptions: An In-Vitro Study

VINOTHKUMAR

2024

Eur Endod J

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“…Additionally, results from POB tests were better at predicting failures of the material as estimated using finite element analysis. Winter et al [29] reported that the fracture resistance and flexural strength of CAD/CAM polymer-based materials were lower than those of glass ceramics but still sufficient for use in the first molar region; however, they did not determine any correlations between the two mechanical properties. Rohr et al [22] reported that a linear trend was found between the fracture load and the fracture toughness of Pekkton material.…”

Section: Introductionmentioning

confidence: 97%

Relation of Crown Failure Load to Flexural Strength for Three Contemporary Dental Polymers

Alghazzawi

2023

Polymers

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Polymeric materials show great promise for use in a variety of dental applications. Manufacturers generally provide flexural strength information based on standardized (ISO and ASTM) specimen dimensions and loading conditions. It is not clear, however, if flexural strength data are predictive of the clinical performance of dental crowns. The objectives of this study were, therefore, to determine whether flexural strengths, as measured via three-point bending (3PB), would be predictive of failure loads assessed via crunch-the-crown (CTC) tests. Three brands of polymers (Trilor, Juvora, and Pekkton) were fabricated into rectangular bars and fully contoured crowns (10 specimens of each polymer brand, 30 specimens of each shape). Differential scanning calorimetry (DSC), Fourier transform infrared spectroscopy (FTIR), and burn off tests were used to characterize/confirm the materials. Bars were tested blindly in 3PB to determine flexural strength, and crowns were CTC-tested to determine failure load after luting to resin abutments. The statistical significance of the test results was evaluated via one-way ANOVA (α = 0.05) and Pearson’s correlation coefficient, while regression analysis was used to test for a correlation between 3PB and CTC results. The fracture mechanisms and failure surface characteristics were characterized using scanning electron microscopy (SEM). There were significant differences (p < 0.05) in the mean crown failure loads (Trilor (7033 N) > Juvora (5217 N) > Pekkton (3023 N)) and mean flexural strengths of the bars (Trilor (468 MPa) > Juvora (197 MPa) = Pekkton (192 MPa)). The mode of crown fracture was different between the materials and included deformation (Juvora), ductile-to-brittle fracture (Pekkton), and a combination of cracks and deformation (Trilor). Flexural strengths did not correlate with the corresponding crown failure loads for any of the materials tested. These results suggest that dental practitioners should not rely on the flexural strengths reported from three-point bending tests, as advertised by the manufacturer, to predict the performance of polymeric crowns.

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“…Fort the aim of the achieve better prosthetic results, it has developed to the use of restorations produced by the CAD/CAM system (computer-aided design/computer-aided manufacturing), which is an extensive technique in last decades. This technique allowed to manufacture the fixed restorations in a single session with excellent accuracy and adaptation [ 3 , 4 ], using industrially manufactured ceramic blocks [ 5 , 6 ]. Materials with different compositions and microstructures are available for CAD/CAM, such as lithium disilicate glass–ceramics and zirconium-oxide based polycrystalline ceramics which were most popular on the dental market [ 6 ].…”

Section: Introductionmentioning

confidence: 99%

Surface roughness and characteristics of CAD/CAM zirconia and glass ceramics after combined treatment procedures

2022

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Background The roughening of the inner surface of a fixed ceramic restoration is an important factor for the bonding process. The aim of this study is to investigate the effect of combined surface treatments (acid etching, air-abrasion and Er: YAG Laser) on surface roughness of CAD/CAM fabricated zirconia (ZrO2) and lithium-disilicate glass ceramics (LDS). Methods Sixty ZrO2 (Ceramill Zi) and LDS (IPS e.max CAD) specimens, (5 mm in width, 5 mm in length and 1.5 mm in height) were fabricated using CAD/CAM and sintered according to the manufacturer’s instructions. All specimens subjected to three surface treatment combinations; etching with 4% hydrofluoric acide (HF), airborne-particle abrasion with 110-μm alumina (Al2O3) (AP) and Er:YAG laser (Er:YAG) (Group A—HF + AP; Group B—Er:YAG + AP, and Group C—Er:YAG + HF). Perthometer was used to measure the surface roughness of the specimens before and after the tretments. Results Group A presented the highest Ra (LDS 0.81 ± 0.27 and ZrO2 0.67 ± 0.21 after treatment) and Group C the lowest (LDS 0.45 ± 0.13 and ZrO2 0.26 ± 0.07, after treatment). Compared with before treatment, the Ra were significantly different only in Group A both ZrO2 and LDS after treatment (p < 0.05). Qualitative SEM images suggested the surface topography of the ZrO2 was smoother than the LDS. Less surface changes were observed in the Er:YAG combined procedures than HF + AP. Conclusions HF + AP was significantly succesful in modifying the ceramic surface. Er:YAG did not sufficiently promote the surface topography, even if combined with any other treatments. Overall, surface tretments on ZrO2 not easier than LDS.

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The flexural strength of CAD/CAM polymer crowns and the effect of artificial ageing on the fracture resistance of CAD/CAM polymer and ceramic single crowns

Cited by 10 publications

References 34 publications

Comparison of Reverse Sandwich Restorations Versus Composite Fillings for the Restoration of External Cervical Resorptions: An In-Vitro Study

Comparison of Reverse Sandwich Restorations Versus Composite Fillings for the Restoration of External Cervical Resorptions: An In-Vitro Study

Relation of Crown Failure Load to Flexural Strength for Three Contemporary Dental Polymers

Surface roughness and characteristics of CAD/CAM zirconia and glass ceramics after combined treatment procedures

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