scholarly journals Comparing the Repair of Veneered Zirconia Crowns with Ceramic or Composite Resin: An in Vitro Study

2020 ◽  
Vol 8 (2) ◽  
pp. 37
Author(s):  
Hattanas Kumchai ◽  
Patrapan Juntavee ◽  
Arthur F. Sun ◽  
Dan Nathanson
Keyword(s):  
Resin Composite ◽  
Testing Machine ◽  
Ceramic Materials ◽  
Resin Cement ◽  
Cylindrical Shape ◽  
Cohesive Failure ◽  
Load To Failure ◽  
Cad Cam ◽  
Zirconia Crowns

Statement of problem: Current techniques for repairing porcelain-chipped restorations have several limitations. With advances in CAD/CAM technology, the combination of resin cements and high-strength ceramic materials might offer new options for repairing the chipping of veneering ceramic. Purpose: The purpose of this study is to compare the load-to-failure of veneered zirconia crowns repaired by different materials. Material and Methods: Veneered zirconia crowns were made on aluminum dies (n = 10/group). Feldspathic porcelain (Vita VM9, Vident) was applied to the zirconia coping (Vita In-Ceram YZ, Vident) in a cylindrical shape (Ø 10.5 mm, height 7.5 mm). A bevel cut on the porcelain veneer (45 degree, 3 mm width) was made at one side of each crown to simulate porcelain chipping. The crowns were then divided into four different groups according to the repair materials: 1. Conventional resin composite (A; Tetric EvoCeram, Ivoclar Vivadent); 2. Flowable resin composite (B; G-aenial Universal Flo, GC america); 3. CAD/CAM milled feldspathic ceramic (C; Vita Trilux Forte, Vident); 4. CAD/CAM milled lithium disilicate glass-ceramic (D; IPS e.max CAD, Ivoclar Vivadent). Resin cement (Multilink Automix, Ivoclar Vivadent) was used to cement the CAD/CAM ceramic materials to the beveled crowns. Each crown underwent 5000 cycles of thermocycling. The strength test was performed on an Instron universal testing machine by loading force on the center of repaired part to record load-to-failure. Data were analyzed by ANOVA and Tukey HSD post-hoc tests (α = 0.05). Results: Mean loads-to-failure (in Newton +/− SD) of repaired veneered zirconia crowns were: Gr. A: 660.0 ± 200.5; Gr. B: 681.7 ± 175.9; Gr. C: 1236.0 ± 188.8; Gr. D: 1536.3 ± 286.1. Catastrophic failure was the most dominant failure mode in every group. Few specimens exhibited cohesive failure. Only one specimen in group D had adhesive failure. Conclusions: Within the limitation of the study, veneered zirconia crowns repaired with CAD/CAM ceramic materials have significantly higher load-to-failure than veneered crowns repaired with resin composite (p ≤ 0.05). Clinical Implications: Traditionally, porcelain-chipped restorations are often repaired with resin composite and bonding technique. Repairing chipped porcelain with CAD/CAM ceramics fitting the fractured parts can be alternative option with potential advantages. More well-designed studies are necessary to justify this novel repair technique.

scholarly journals In Vitro Evaluation of the Effect of Different Luting Cements and Tooth Preparation Angle on the Microleakage of Zirconia Crowns

2021 ◽  
Vol 2021 ◽  
pp. 1-7
Author(s):  
Behnaz Ebadian ◽  
Amirhossein Fathi ◽  
Melika Savoj
Keyword(s):  
Resin Cement ◽  
Cement Type ◽  
Digital Photograph ◽  
Luting Cements ◽  
Luting Cement ◽  
Cad Cam ◽  
Zirconia Crowns ◽  
Tooth Preparation ◽  
Cementing Agent

Introduction. Discrepancy between the crown border and prepared tooth margin leads to a microleakage that eases the penetration of microorganisms and causes the dissolution of luting cement consequently. Several factors should be considered to achieve optimal fitness, including tooth preparation taper and type of cementing agent. The study aimed to determine the relation of tooth preparation taper and cement type on the microleakage of zirconia crowns. Materials and Methods. Fifty-six freshly extracted premolars without caries and restorations were selected as the study sample and divided into two groups of different tapering degrees (6 and 12 degrees). Zirconia copings were designed and fabricated by the CAD/CAM system. The samples were divided into four subgroups for cementation, and each subgroup was cemented with a different luting cement (n = 7). After 5000 thermocycles at 5°C–55°C and dye penetration, the specimens were sectioned in the mid-buccolingual direction, and a digital photograph of each section was taken under a stereomicroscope. Data were analyzed by the Kruskal–Wallis and Mann–Whitney tests (α = 0.05). Results. The results showed significant differences among the four types of luting cement in marginal permeability (PV < 0.001). Regardless of the type of cement, the 12-degree tapering resulted in a lower microleakage (46.4% without microleakage) with statistically significant differences from the 6-degree tapering (PV = 0.042). Conclusion. Within the limitations of this study, increasing the tapering degree of the prepared tooth for CAD/CAM zirconia copings improved the marginal fit and decreased the microleakage score. In addition, total-etch resin cement indicated the least microleakage.

Fracture Resistance of Endodontically-treated Teeth Restored Using Three Root-reinforcement Methods

2008 ◽  
Vol 9 (1) ◽  
pp. 30-37 ◽  
Author(s):  
Soodabeh Kimyai ◽  
Horieh Moosavi ◽  
Fathemeh Maleknejad
Keyword(s):  
Fracture Resistance ◽  
Resin Composite ◽  
Testing Machine ◽  
Acrylic Resin ◽  
Mean Value ◽  
Resin Cement ◽  
Endodontically Treated Teeth ◽  
Root Reinforcement ◽  
Anterior Teeth

Abstract Aim The aim of this in vitro study was to compare the fracture resistance of endodontically-treated anterior teeth with their roots reinforced using three different restorative methods. Methods and Materials Forty sound maxillary human central incisors were randomly assigned to four groups (n=10). The crowns of the teeth were removed at a level 2 mm incisal to the cementoenamel junction (CEJ). After root canal therapy, flared canals were simulated in three groups. In the first, second, and third groups the flared canals were reinforced with resin composite (RCO) (Clearfil DC Core Automix), two Reforpins (REF), and a resin cement (RCE) (Panavia F 2.0), respectively. In the fourth (DEN) group flared canals were not created. The same size fiber reinforced composite (FRC) posts were cemented with resin cement (Panavia F 2.0) in all groups. After post cementation and restoration of the teeth crown with a core build-up composite (Clearfil Photo Core), the roots of the teeth were embedded in acrylic resin blocks up to 1 mm below the CEJ. The samples were loaded in an Instron testing machine with a crosshead speed of 0.5 mm/min at a 45° angle to the long axis of the tooth on the palatal surfaces until failure occurred. Data were analyzed using the Kruskal-Wallis, Mann-Whitney, and Chi-square tests (p=0.05). Results Significant differences were found between fracture resistance in all of the groups (P<0.05) with the exception being among the RCO and REF groups. The least mean value 230 (130) N and the highest mean value 830 (220) N were shown in the fracture resistance of the RCE and DEN groups, respectively. Conclusion Reforpin can be used as an alternative to resin composite for internal reinforcement of weakened roots according to the results of this study. For reinforcement of flared canals, fiber posts along with Reforpin or resin composite proved to have higher fracture resistance than resin cement. Non flared canals had the highest fracture resistance. Citation Moosavi H, Maleknejad F, Kimyai S. Fracture Resistance of Endodontically-treated Teeth Restored Using Three Root-reinforcement Methods. J Contemp Dent Pract 2008 January; (9)1:030-037.

Evaluation of Fracture Resistance of Varying Thicknesses of Zirconia Around Implant Abutment Cylinders

2017 ◽  
Vol 43 (5) ◽  
pp. 328-332 ◽  
Author(s):  
Cheryl J. Park ◽  
Jin-Ho Phark ◽  
Winston W. Chee
Keyword(s):  
Computer Aided Design ◽  
Testing Machine ◽  
Resin Cement ◽  
Minimum Thickness ◽  
Implant Abutment ◽  
Computer Aided ◽  
Load To Failure ◽  
Aided Design ◽  
B Test

Zirconia is becoming increasingly used as a restorative material for implant-supported restorations; however, information is lacking with respect to the minimum thickness of zirconia surrounding the implant components. The purpose of this study is to evaluate the resistance to fracture of different thicknesses of zirconia luted to implant components. Thirty cylinders of zirconia (Prettau, Zirkonzahn) with 13-mm height, designed with indented occlusal surface for loading, and varying wall thicknesses (0.5 mm, 1 mm, 1.5 mm; n = 10/group) were milled using a computer-aided design/computer-aided manufacturing system (Modellier, Zirkonzahn), after which they were sintered. Titanium temporary cylinders (ITCS41, Biomet3i) were attached to 30 implant analogs (ILA20, Biomet3i) that were embedded into polymethylmethacrylate blocks (Palapress Vario, Heraeus Kulzer) with dimensions of 4.5 × 1.8 × 2 cm. Zirconia specimens were cemented to the titanium cylinders using a self-adhesive, dual-cure resin cement (Panavia SA, Kuraray). Load to failure test was performed under compression until fracture using a universal testing machine (Instron5965, Instron) at a crosshead speed of 0.5 mm/min and measured in N (Newton). Statistical analysis was performed using 1-way analysis of variance and Tukey B test at α = .05 (SPSS19, IBM). Mean load to failure was 1059.94 N, 2019.46 N, and 4074.79 N for groups 0.5 mm, 1 mm, and 1.5 mm, respectively. Values were significantly different between the groups (P &lt; .05). Study limitations are that it is in vitro, specimens do not replicate tooth dimensions, and forces are static and directed toward the occlusal portion of each specimen. Within these limitations and considering the average human bite force, a thickness of 0.5 mm to 1 mm of this particular type of zirconia around this type of implant component can avoid fracture with these dimensions.

scholarly journals INFLUENCE OF DIFFERENT SURFACE TREATMENTS OF CAD/CAM HYBRID NANOCERAMICS CROWNS ON BOND STRENGTH OF RESIN COMPOSITE CEMENT

2018 ◽  
Vol 9 (1) ◽  
Author(s):  
Valentina Veselinović ◽  
Rebeka Rudolf ◽  
Nataša Trtić ◽  
Verica Pavlić ◽  
Radmila Arbutina ◽  
...  
Keyword(s):  
Surface Modification ◽  
Hydrofluoric Acid ◽  
Technological Development ◽  
Resin Composite ◽  
Testing Machine ◽  
Resin Cement ◽  
Control Group ◽  
Retention Force ◽  
Group I ◽  
Cad Cam

Introduction: Urgent demand for high-esthetic material, which at the same time has the possibility of absorption of mastication stress, has led to the technological development of hybrid nanoceramics used in CAD / CAM technology. Aim: The aim of the study was to evaluate the effects of different surface modification of hybrid nanoceramic crowns on the quality of the cement retention and the influence of the mastication stress after one year of function. Material and methods: 50 hybrid nanoceramic CAD/CAM crowns (CERASMART, GC) are cemented on titanium implant abutments with self-adhesive resin cement (G-CEM, LinkAce). The samples were divided into five main groups according to surface treatment (n=10): I (sandblasted with 50 microns Al2O3), II (treated with CERAMIC PRIMER II, GC), III (treated with 5% hydrofluoric acid), IV (treated with combination of 5% hydrofluoric acid and CERAMIC PRIMER II), V (control, non-treated group). The samples were storaged during 24 hours at 37°C, thermocycled and loaded under 10 000 mechanical cycles loads (simulation of 12 months of function). Retention forces measured in Universal testing machine. The data were represented as mean ± standard deviation, and for statistical analysis ANOVA test was used. Results: The highest initial retention force was demonstrated in the group IV (6.99±1.18), followed by group I (6.22±1.29), group III (5,97±1,25), group II (5,86±1,17) and control group samples (4.92±1.19). A statistically significant decline in retention force was recorded in all tested groups, with the lowest decrease observed in samples treated with a combination of 5% hydrofluoric acid and CERAMIC PRIMER II (6.08 ± 1.03). Conclusion: Mechanical and chemical surface modification can strongly influence the retentions between resin cement and hybrid nanoceramics. The results from this study are suggesting that the most efficient clinical outcome is the combination of 5% hidrofluoric acid and CERAMIC PRIMER II.

scholarly journals Efficacy of Fiber Post Bonding To Root Dentin after Different Obturation Techniques and Cementation Timings: In Vitro Study

2018 ◽  
Vol 6 (9) ◽  
pp. 1707-1711
Author(s):  
Rami M. Atia ◽  
Nada Omar ◽  
Haidy Nabil ◽  
Yousra Aly
Keyword(s):  
Bond Strength ◽  
Statistical Significance ◽  
Testing Machine ◽  
In Vitro Study ◽  
Resin Cement ◽  
Vitro Study ◽  
Endodontically Treated Teeth ◽  
Root Dentin ◽  
Push Out

OBJECTIVE: The aim of this in vitro study was to assess the effect of obturation technique and cementation timings on the bonding of fibre-reinforced posts to the root canal walls. METHODS: Twenty extracted teeth were randomly allocated to two groups according to the obturation technique and cementation timing. Central incisors with single canals were used after being decoronated. Every extracted tooth of the {vertical compaction group} (VC) group (n = 10) had been obturated using the {E & Q plus obturation system} with posts cemented in the same day; The other (CO) conventional group (n = 10) teeth were obturated using the conventional lateral compaction technique and posts cemented after one week. “SF“ Fiber posts were used after bonding and cementation using Rely X ARC resin cement with all the endodontically treated teeth. The push-out test was performed in a universal testing machine. Data were analysed by 2 way analysis of variance with Statistical significance was set to 0.05. RESULTS: Heat softened gutta percha group showed more push out the bond strength of the bonded posts than the conventional obturation group (p < 0.05). In the middle region, there was no statistical significance between the two groups while there was significance in the coronal and apical thirds. CONCLUSION: The vertical compaction technique and early cementation improved the bond strength of the resin posts in comparison to the conventional obturation technique with late cementation.

scholarly journals Effects of Universal Adhesive on Shear Bond Strength of Resin Cement to Zirconia Ceramic with Different Surface Treatments

2021 ◽  
Vol 2021 ◽  
pp. 1-6
Author(s):  
Zohreh Moradi ◽  
Farnoosh Akbari ◽  
Sara Valizadeh
Keyword(s):  
Bond Strength ◽  
Shear Bond Strength ◽  
Testing Machine ◽  
In Vitro Study ◽  
Surface Treatments ◽  
Resin Cement ◽  
Zirconia Ceramic ◽  
Single Bond ◽  
Universal Adhesive

Aim. This study aimed to assess shear bond strength (SBS) of resin cement to zirconia ceramic with different surface treatments by using Single Bond Universal. Methods. In this in vitro study, 50 zirconia discs (2 × 6 mm) were divided into 5 groups of (I) sandblasting with silica-coated alumina (CoJet)  + silane + Single Bond 2, (II) sandblasting with CoJet + Single Bond Universal, (III) sandblasting with alumina + Single Bond Universal, (IV) sandblasting with alumina + Z-Prime Plus, and (V) Single Bond Universal with no surface treatment. Resin cement was applied in plastic tubes (3 × 5 mm2), and after 10,000 thermal cycles, the SBS was measured by a universal testing machine. The mode of failure was determined under a stereomicroscope at × 40 magnification. Data were analyzed using one-way ANOVA. Results. The maximum (6.56 ± 4.29 MPa) and minimum (1.94 ± 1.96 MPa) SBS values were noted in groups III and I, respectively. Group III had the highest frequency of mixed failure (60%). Group V had the maximum frequency of adhesive failure (100%). Conclusion. Single Bond Universal + sandblasting with alumina or silica-coated alumina particles is an acceptable method to provide a strong SBS between resin cement and zirconia.

scholarly journals COMPARATIVE EVALUATION OF THE SHEAR BOND STRENGTH OF THREE SELF-ETCH DENTIN BONDING AGENTS TO DENTIN: AN IN-VITRO STUDY

2020 ◽  
Vol 8 (10) ◽  
pp. 454-459
Author(s):  
Bhalla V. ◽  
◽  
K. Goud M. ◽  
Chockattu S. ◽  
Khera A ◽  
...  
Keyword(s):  
Bond Strength ◽  
Shear Bond Strength ◽  
Resin Composite ◽  
Testing Machine ◽  
Group Analysis ◽  
In Vitro Study ◽  
Bonding Agents ◽  
Mandibular Molar ◽  
Self Etch

Background:Dentin bonding is an ever-evolving field in adhesive dentistry. With the introduction of newer systems into the market, there is a crucial need to test their efficiency in terms of bond strength. Dual-cured adhesives in theory may provide for a better degree of conversion as compared to conventional light-cured adhesives .Thus, the aim of this study was to compare the shear bond strength of three different self-etch adhesives namely ClearfilSE bond (Kuraray), Tetric N Bond Universal (IvoclarVivadent) and Futura Bond DC (Voco) to dentin. Materials & Methods: Ninety extracted non-carious, intact human mandibular molar teeth were selected for this study. Each tooth was decoronated using a double-sided diamond disc with water coolant to a depth of 2mm from the cusp tip .The cut dentin surface was then abraded against 600-grit wet silicon carbide papers for 60 seconds to produce a uniform smear layer. The root portion of each tooth was mounted on a plastic ring using cold cure acrylic resin. Specimens were then divided into three adhesive groups of 30 teeth each, Group A: ClearfilSE Bond (Kuraray), Group B: Tetric N Bond Universal (IvoclarVivadent), Group C :Futura Bond DC (Voco). All bonding agents were used according to the manufacturers’ instructions, in combination with the resin composite Tetric N Ceram (IvoclarVivadent). The samples were thermocycled, followed by shear bond strength testing using a Universal testing machine (Hounsfield). Data were subjected to statistical analysis using one-way analysis of variance (ANOVA) (P<0.05) and Post hoc Tukey’s test for inter- and intra- group analysis respectively. Results: Clearfil SE Bond yielded the highest shear bond strength values (30.9 ±4.66 MPa) which were statistically significant, followed byTetric N Bond Universal group (29.8 ±4.34) and the lowest shear bond strength values were recorded for Futura Bond DC (18.2 ±3.13). Conclusion: Clearfil SE bond and Tetric N bond Universal can be considered as better options than Futura Bond DC.

scholarly journals Effects of Immediate and Delayed Cementations for CAD/CAM Resin Block after Alumina Air Abrasion on Adhesion to Newly Developed Resin Cement

Materials ◽  
2021 ◽  
Vol 14 (22) ◽  
pp. 7058
Author(s):  
Akane Chin ◽  
Masaomi Ikeda ◽  
Tomohiro Takagaki ◽  
Toru Nikaido ◽  
Alireza Sadr ◽  
...  
Keyword(s):  
Bond Strength ◽  
Water Sorption ◽  
Resin Composite ◽  
Resin Cement ◽  
Air Abrasion ◽  
Resin Cements ◽  
Significant Difference ◽  
Computer Aided ◽  
Cad Cam ◽  
Curing Methods

The purpose of this study was to evaluate the effect of one week of Computer-aided design/Computer-aided manufacturing (CAD/CAM) crown storage on the μTBS between resin cement and CAD/CAM resin composite blocks. The micro-tensile bond strength (μTBS) test groups were divided into 4 conditions. There are two types of CAD/CAM resin composite blocks, namely A block and P block (KATANA Avencia Block and KATANA Avencia P Block, Kuraray Noritake Dental, Tokyo, Japan) and two types of resin cements. Additionally, there are two curing methods (light cure and chemical cure) prior to the μTBS test—Immediate: cementation was performed immediately; Delay: cementation was conducted after one week of storage in air under laboratory conditions. The effect of Immediate and Delayed cementations were evaluated by a μTBS test, surface roughness measurements, light intensity measurements, water sorption measurements and Scanning electron microscope/Energy dispersive X-ray spectrometry (SEM/EDS) analysis. From the results of the μTBS test, we found that Delayed cementation showed significantly lower bond strength than that of Immediate cementation for both resin cements and both curing methods using A block. There was no significant difference between the two types of resin cements or two curing methods. Furthermore, water sorption of A block was significantly higher than that of P block. Within the limitations of this study, alumina air abrasion of CAD/CAM resin composite restorations should be performed immediately before bonding at the chairside to minimize the effect of humidity on bonding.

scholarly journals Grinding of composite cores using diamond burs with different grit sizes

2020 ◽  
Vol 19 ◽  
pp. e201574
Author(s):  
Vinicius Felipe Wandscher ◽  
Ana Maria Estivalete Marchionatti ◽  
Damiano Lodi Giuliani ◽  
Roberto Scotti ◽  
Paolo Baldissara ◽  
...  
Keyword(s):  
Resin Cement ◽  
Cohesive Failure ◽  
Adhesive Resin ◽  
Ctrl Group ◽  
Diamond Bur ◽  
Predominant Type ◽  
Alumina Particles ◽  
Zirconia Crowns ◽  
Type Of Failure ◽  
Aged Composite

Aim: To evaluate the retention of Y-TZP crowns cemented in aged composite cores ground with burs of different grit sizes. Methods: Sixty composite resin simplified full-crown preparations were scanned, while 60 Y-TZP crowns with occlusal retentions were milled. The composite preparations were stored for 120 days (wet environment-37°C) and randomly distributed into three groups (n=20) according to the type of composite core surface treatment. The groups were defined as: CTRL (control: No treatment), EFB (extra-fine diamond bur [25μm]), and CB (coarse diamond bur [107μm]). The grinding was performed with an adapted surveyor standardizing the speed and pressure of the grinding. The intaglio surfaces on the crowns were air-abraded with silica-coated alumina particles (30 μm) and then a silane was applied. The crowns were cemented with self-adhesive resin cement, thermocycled (12,000 cycles; 5/55°C), stored (120 days) and submitted to aretention test (0.5mm/min). The retentive strength data (MPa) were analyzed using one-way analysis of variance and Tukey test, as well as Weibull analysis. Failures were classified as 50C (above 50% of cement in the crown), 50S (above 50% of cement in the substrate) and COE (composite core cohesive failure). Results: No statistical difference was observed among the retention values (p=0.975). However, a higher Weibull modulus was observed in the CTRL group. The predominant type of failure was 50S (above 50% of cement in the substrate composite). Conclusion: The retention of zirconia crowns was not affected by grinding using diamond burs with different grit sizes (coarse/extra-fine) or when no grinding was performed.

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