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Ghoveizi R, Baghaei M, Tavakolizadeh S, Tabatabaian F. Color match of ultra-translucency multilayer zirconia restorations with different designs and backgrounds. J Prosthodont 2024; 33:382-388. [PMID: 37155925 DOI: 10.1111/jopr.13700] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/10/2022] [Accepted: 05/03/2023] [Indexed: 05/10/2023] Open
Abstract
PURPOSE The purpose of this in vitro study was to assess the color match of ultra-translucency multilayer zirconia restorations with different designs and backgrounds. MATERIALS AND METHODS Thirty ultra-translucency multilayer zirconia crown specimens were made in VITA classical shade B2 for a prepared maxillary central incisor. The specimens were divided into three groups based on the restoration design: veneered zirconia with a trestle design (VZT), veneered zirconia with a dentin core design (VZD), and full-contour zirconia (FCZ). In the groups VZT and VZD, the zirconia specimens were layered with a feldspathic veneering ceramic. The specimens were seated on five different backgrounds: shade B2 composite resin, shade B2 zirconia, copper-colored metal alloy, silver-colored metal alloy, and the prepared central incisor. CIELab values of the labial middle sections of the crown specimens were measured with a spectrophotometer. Color differences between the specimens and a shade B2 VITA classical tab (as a control) were calculated from the ΔE* ab formula and compared with an acceptability threshold (ΔE* ab = 3.7) to be clinically explicated. RESULTS Mean ΔE* ab values ranged between 1.17 and 8.48. The restoration design, the background type, and their interaction affected the ΔE* ab (p < 0.001). The mean ΔE* ab values for VZT with all backgrounds and for VZD with the silver-colored metal background were greater than the threshold (p < 0.001), whereas the mean ΔE* ab values for VZD with the other backgrounds and FCZ with all backgrounds were less than the threshold (p = 1). CONCLUSIONS Restoration design and background type affected the color match of ultra-translucency multilayer zirconia restorations. VZT restorations on all backgrounds and VZD restorations on a silver-colored metal background showed color mismatches. However, VZD restorations on the other backgrounds and FCZ restorations on all backgrounds demonstrated color matches.
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Affiliation(s)
- Rahab Ghoveizi
- Department of Prosthodontics, School of Dentistry, Shahid Beheshti University of Medical Sciences, Tehran, Iran
| | - Maryam Baghaei
- School of Dentistry, Shahid Beheshti University of Medical Sciences, Tehran, Iran
| | - Sara Tavakolizadeh
- Department of Prosthodontics, School of Dentistry, Shahid Beheshti University of Medical Sciences, Tehran, Iran
| | - Farhad Tabatabaian
- Faculty of Dentistry, The University of British Columbia, Vancouver, British Columbia, Canada
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Golrezaei M, Mahgoli HA, Yaghoobi N, Niakan S. The Effect of Modified Framework Design on the Fracture Resistance of IPS e.max Press Crown after Thermocycling and Cyclic Loading. J Contemp Dent Pract 2024; 25:79-84. [PMID: 38514436 DOI: 10.5005/jp-journals-10024-3621] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/23/2024]
Abstract
AIM This study aimed to investigate the effect of modified framework (MF) design on the fracture resistance of IPS e.max Press anterior single crown after thermocycling and cyclic loading. MATERIALS AND METHODS Two types of IPS e.max Press frameworks were designed (n = 10); standard framework (SF) with a 0.5 mm uniform thickness and MF with a lingual margin of 1 mm in thickness and 2 mm in height connected to a proximal strut of 4 mm height and a 0.3 mm wide facial collar. The crowns were cemented to resin dies, subjected to 5,000 cycles of thermocycling, and loaded 10,000 cycles at 100 N. A universal testing machine was used to load specimens to fracture, and the modes of failure were determined. RESULTS The mean and standard deviation (SD) of fracture resistance were 219.24 ± 110.00 N and 216.54 ±120.02 N in the SF and MF groups. Thus, there was no significant difference (p = 0.96). Mixed fracture was the most common failure mode in both groups. We found no statistically significant difference between the groups (p = 0.58). CONCLUSION The MF design did not increase the fracture resistance of IPS e.max Press crown. CLINICAL SIGNIFICANCE Framework design is an essential factor for the success of all-ceramic restorations and its modification might be regarded as an approach to increase fracture resistance. Furthermore, the modified design was evaluated in metal-ceramic or zirconia crowns while less attention was paid to the IPS e.max Press crowns. How to cite this article: Golrezaei M, Mahgoli HA, Yaghoobi N, et al. The Effect of Modified Framework Design on the Fracture Resistance of IPS e.max Press Crown after Thermocycling and Cyclic Loading. J Contemp Dent Pract 2024;25(1):79-84.
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Affiliation(s)
- Mahnaz Golrezaei
- Department of Prosthodontics, School of Dentistry, Tehran University of Medical Sciences, Tehran, Iran
| | - Hossein Ali Mahgoli
- Department of Prosthodontics, School of Dentistry, Tehran University of Medical Sciences, Tehran, Iran
| | - Negin Yaghoobi
- Department of Prosthodontics, School of Dentistry, Tehran University of Medical Sciences, Tehran, Iran
| | - Somayeh Niakan
- Department of Prosthodontics, School of Dentistry, Tehran University of Medical Sciences, Tehran, Iran, Phone: +98 9126727694, e-mail:
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Alsubaiy EF, Chaturvedi S, Qutub OA, Mously HA, Zarbah MA, Haralur SB, Bhagat TV. Novel CAD-CAM zirconia coping design to enhance the aesthetics and strength for anterior PLZ crowns. Technol Health Care 2021; 29:1161-1171. [PMID: 33998567 DOI: 10.3233/thc-202782] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
BACKGROUND The aesthetics and strength of anterior porcelain layered zirconia (PLZ) crowns are mainly affected by the zirconia (Zr) coping design. There is a need for a modified design to enhance aesthetics with strength. OBJECTIVES The purpose of this study was to compare the fracture resistance of anterior PLZ crowns having modified CAD-CAM Zr coping designs (in terms of thickness and marginal collar designs) with standard Zr copings. METHODS Fifty PLZ crowns were fabricated and divided into two groups: Gr 1: Standard Zr Coping (SZC) (control gr) with 0.5 mm thickness (Facial-F, Mesial-M, Distal-D, incisal-I, and Palatal-P) without a collar; Gr 2: Collar Zr Coping (CZC) (test gr) with 2.5 mm collar height on M, D, P and 0.2 mm F and variable facial wall thickness. Subgroups: Gr 2a: (CZC-0.5 mm) facial wall thickness 0.5 mm; Gr 2b: (CZC-0.4 mm) facial wall thickness 0.4 mm; Gr 2c: (CZC-0.3 mm) facial wall thickness 0.3 mm; Gr 2d: (CZC-0.2 mm) facial wall thickness 0.2 mm. The fracture load was determined and analysed using One-way ANOVA and Dunnet test. RESULTS The minimum fracture load was 927.36 ± 127.80 N observed for Gr 2c (CZC at 0.3 mm) while the maximum fracture load was 1373.61 ± 146.54 N observed for Gr 2a (CZC at 0.5 mm). A highly significant difference in mean fracture load among various Zr coping groups (p< 0.001) was determined. CONCLUSIONS Novel Zr coping design for anterior PLZ crowns can provide better aesthetics with strength. Reducing the thickness of Zr coping in the aesthetic zone to 0.2 mm and providing a modified collar design (2.5 mm collar height on M, D, P, and 0.2 mm F) would provide strength without jeopardizing aesthetics.
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Affiliation(s)
- Ebrahim Fihaid Alsubaiy
- Department of Prosthetic Dentistry, College of Dentistry, King Khalid University, Abha, Saudi Arabia
| | - Saurabh Chaturvedi
- Department of Prosthetic Dentistry, College of Dentistry, King Khalid University, Abha, Saudi Arabia
| | - Osama A Qutub
- Oral and Maxillofacial Prosthodontics Department, College of Dentistry, King Abdulaziz University, Saudi Arabia
| | - Hisham Abdullah Mously
- Oral and Maxillofacial Prosthodontics Department, College of Dentistry, King Abdulaziz University, Saudi Arabia
| | - Mohammad Abdullah Zarbah
- Department of Prosthetic Dentistry, College of Dentistry, King Khalid University, Abha, Saudi Arabia
| | - Satheesh B Haralur
- Department of Prosthetic Dentistry, College of Dentistry, King Khalid University, Abha, Saudi Arabia
| | - Tushar V Bhagat
- College of Dentistry, Prince Sattam bin Abdulaziz University, AlKharj, Saudi Arabia
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Lin F, Ordinola-Zapata R, Xu H, Heo YC, Fok A. Laboratory simulation of longitudinally cracked teeth using the step-stress cyclic loading method. Int Endod J 2021; 54:1638-1646. [PMID: 33852743 DOI: 10.1111/iej.13530] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/05/2020] [Revised: 04/08/2021] [Accepted: 04/09/2021] [Indexed: 12/14/2022]
Abstract
AIM To simulate in a laboratory setting longitudinal cracking in root filled premolar teeth, using cyclic mechanical fatigue. METHODOLOGY Mesial-occlusal-distal (MOD) cavities were prepared in twenty root filled, single-rooted, mandibular premolars restored with fibre posts and resin composites. The samples were randomly divided into two groups based on the loading approaches: static loading with a crosshead speed of 0.5 mm/min and step-stress cyclic loading (1 Hz) with increasing amplitude. The loads and numbers of cycles to failure were recorded. Micro-CT was also used to identify the fracture modes. Statistical analysis was performed using Student's t-test. The level of significance was set at 0.05. RESULTS The mean fracture loads for the static loading and cyclic loading groups were 769 ± 171 N and 720 ± 92 N, respectively. There was no significant difference between the two groups (P > 0.05). The proportions of longitudinal, cuspal and mixed-mode fractures under cyclic loading were 50%, 20% and 30%, respectively. Longitudinal fractures occurred with larger numbers of cycles and higher average loads per cycle compared with the other fractures. Static loading produced only cuspal fractures. CONCLUSIONS Longitudinally cracked premolar teeth with root fillings were successfully produced using the step-stress cyclic loading method. This provides a more clinically representative methodology for studying cracked teeth in a laboratory setting.
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Affiliation(s)
- F Lin
- Department of Cariology and Endodontology, Peking University School and Hospital of Stomatology, Beijing, China.,Minnesota Dental Research Center for Biomaterials and Biomechanics, School of Dentistry, University of Minnesota, Minneapolis, USA
| | - R Ordinola-Zapata
- Division of Endodontics, Department of Restorative Sciences, School of Dentistry, University of Minnesota, Minneapolis, USA
| | - H Xu
- Department of Stomatology, Affiliated Hospital of Qingdao University, Qingdao, China
| | - Y C Heo
- Minnesota Dental Research Center for Biomaterials and Biomechanics, School of Dentistry, University of Minnesota, Minneapolis, USA
| | - A Fok
- Minnesota Dental Research Center for Biomaterials and Biomechanics, School of Dentistry, University of Minnesota, Minneapolis, USA
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Ramos GF, Ramos NC, Alves LMM, Kaizer MR, Borges ALS, Campos TMB, Melo RM. Failure probability and stress distribution of milled porcelain-zirconia crowns with bioinspired/traditional design and graded interface. J Mech Behav Biomed Mater 2021; 119:104438. [PMID: 33798936 DOI: 10.1016/j.jmbbm.2021.104438] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/18/2020] [Revised: 09/14/2020] [Accepted: 02/26/2021] [Indexed: 10/21/2022]
Abstract
OBJECTIVE To evaluate the failure probability and stress distribution of traditional and bioinspired porcelain-zirconia milled crowns, with and without silica infiltration (graded zirconia). METHODS Traditional crown design had a zirconia infrastructure veneered with porcelain; Bioinspired, had a porcelain infrastructure with translucent-zirconia veneer; Graded and Graded Bioinspired crowns had their zirconia layer infiltrated by silica (n = 25). The cameo surface of each crown (porcelain or zirconia) was glazed. The restoration layers were fused by a vitreous connector and the crowns were adhesively cemented to dies. The specimens were then mechanically cycled in a sliding machine using 100 N load at 4 Hz. The specimens were tested until 2 × 106 cycles, and every 0.5 × 106 cycles the crowns were evaluated under stereomicroscopy for the presence of failures. The stress distribution was inspected with Finite Element Analyses. RESULTS The predominant failure modes for the Traditional and Graded crowns were delamination and cracking, respectively. The Weibull parameters beta and eta were, respectively: Traditional 1.30 and 2.3 × 106 cycles, and Graded 1.95 and 2.3 × 106 cycles. Thus, the Traditional and Graded crowns presented greater susceptibility to failure due to fatigue, while the Bioinspired and Graded Bioinspired crowns showed no fatigue effect using 100N load, showing beta = 1 and eta of approximately 17 × 106 cycles. Also, through finite element analyses, it was verified that the Bioinspired and Graded Bioinspired crowns presented the best stress distribution on both crowns and dental structures. SIGNIFICANCE Bioinspired and Graded Bioinspired crowns had the lowest failure probability and better stress distribution and may be considered robust long lasting restorations.
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Affiliation(s)
- G F Ramos
- Department of Dental Materials and Prosthodontics, São Paulo State University (UNESP), Institute of Science and Technology, 777 Eng. Francisco José Longo Avenue, 12245-000, São José Dos Campos, SP, Brazil.
| | - N C Ramos
- Department of Dental Materials and Prosthodontics, São Paulo State University (UNESP), Institute of Science and Technology, 777 Eng. Francisco José Longo Avenue, 12245-000, São José Dos Campos, SP, Brazil; College of Dentistry, Sao Francisco University (USF), 218 Sao Francisco de Assis Avenue, 12916-900, Bragança Paulista, SP, Brazil.
| | - L M M Alves
- Department of Dental Materials and Prosthodontics, São Paulo State University (UNESP), Institute of Science and Technology, 777 Eng. Francisco José Longo Avenue, 12245-000, São José Dos Campos, SP, Brazil.
| | - M R Kaizer
- College of Dentistry, Positivo University (UP), 5300 Prof. Pedro Viriato Parigot de Souza Street, 81280-330, Curitiba, PR, Brazil.
| | - A L S Borges
- Department of Dental Materials and Prosthodontics, São Paulo State University (UNESP), Institute of Science and Technology, 777 Eng. Francisco José Longo Avenue, 12245-000, São José Dos Campos, SP, Brazil.
| | - T M B Campos
- Physics Department, Technological Institute of Aeronatics (ITA), 50 Praça Marechal Eduardo Gomes, 12228-900, São José Dos Campos, SP, Brazil.
| | - R M Melo
- Department of Dental Materials and Prosthodontics, São Paulo State University (UNESP), Institute of Science and Technology, 777 Eng. Francisco José Longo Avenue, 12245-000, São José Dos Campos, SP, Brazil.
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Fracture Load of Metal, Zirconia and Polyetheretherketone Posterior CAD-CAM Milled Fixed Partial Denture Frameworks. MATERIALS 2021; 14:ma14040959. [PMID: 33670544 PMCID: PMC7922591 DOI: 10.3390/ma14040959] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/26/2021] [Revised: 02/10/2021] [Accepted: 02/15/2021] [Indexed: 01/02/2023]
Abstract
The aim of this study was to investigate the load to fracture and fracture pattern of prosthetic frameworks for tooth-supported fixed partial dentures (FPDs) fabricated with different subtractive computer-aided design and computer-aided manufacturing (CAD-CAM) materials. Materials and Methods: Thirty standardized specimens with two abutments were fabricated to receive three-unit posterior FDP frameworks with an intermediate pontic. Specimens were randomly divided into three groups (n = 10 each) according to the material: group 1 (MM)—milled metal; group 2 (L)—zirconia; and group 3 (P)—Polyetheretherketone (PEEK). The specimens were thermo-cycled and subjected to a three-point bending test until fracture using a universal testing machine (cross-head speed: 1 mm/min). Axial compressive loads were applied at the central fossa of the pontics. Data analysis was made using one-way analysis of variance, Tamhane post hoc test, and Weibull statistics (α = 0.05). Results: Significant differences were observed among the groups for the fracture load (p < 0.0001). MM frameworks showed the highest fracture load values. The PEEK group registered higher fracture load values than zirconia samples. The Weibull statistics corroborated these results. The fracture pattern was different among the groups. Conclusions: Milled metal provided the highest fracture load values, followed by PEEK, and zirconia. However, all tested groups demonstrated clinically acceptable fracture load values higher than 1000 N. PEEK might be considered a promising alternative for posterior FPDs.
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Granato R, Bergamo ETP, Witek L, Bonfante EA, Marin C, Greenberg M, Kurgansky G, Coelho PG. Clinical, histological, and nanomechanical parameters of implants placed in healthy and metabolically compromised patients. J Dent 2020; 100:103436. [PMID: 32738285 DOI: 10.1016/j.jdent.2020.103436] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/23/2020] [Revised: 07/04/2020] [Accepted: 07/27/2020] [Indexed: 11/16/2022] Open
Abstract
OBJECTIVES To evaluate the clinical outcomes, histological parameters, and bone nanomechanical properties around implants retrieved from healthy and metabolic syndrome (MS) patients. METHODS Twenty-four patients with edentulous mandibles (12/condition), received four implants between the mental foramina. An additional implant prototype was placed for retrieval histology. The following clinical outcomes were evaluated: insertion torque (IT), implant stability quotient (ISQ) values at baseline and after 60 days of healing, and implant survival. The prototype was retrieved after the healing and histologically processed for bone morphometric evaluation of bone-to-implant contact (%BIC) and bone area fraction occupancy (%BAFO), and bone nanoindentation to determine the elastic modulus (Em) and hardness (H). Descriptive statistical procedures and survival tests were used to analyze the data. RESULTS The final study population was comprised of 10 women and 11 men (∼64 years). A total of 105 implants were placed, 21 retrieved for histology. Implant survival rates were similar between groups (>99 %). Similarly, IT and ISQ analyses showed no significant association with systemic condition (p > 0.216). Histological micrographs depicted similar bone morphology, woven bone, for both conditions. While MS (33 ± 5.3 %) and healthy (39 ± 6.5 %) individuals showed no significant difference for %BIC (p = 0.116), significantly higher %BAFO was observed for healthy (45 ± 4.6 %) relative to MS (30 ± 3.8 %) (p < 0.001). No significant differences on bone nanomechanical properties was observed (p > 0.804). CONCLUSIONS Although no significant influence on clinical parameters and bone nanomechanical properties was observed, MS significantly reduced bone formation in the peri-implant area in the short-term. CLINICAL SIGNIFICANCE A lower amount of bone formation in the peri-implant area was observed in comparison to healthy patients, although the other short-term clinical outcomes were not significantly different. Considering the escalating prevalence of MS patients in need for implant treatment, it becomes crucial to understand bone-to-implant response to determine the ideal loading time in this population.
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Affiliation(s)
- Rodrigo Granato
- Postgraduate Program in Dentistry, University of Grande Rio, Rio de Janeiro, RJ, Brazil
| | - Edmara T P Bergamo
- Department of Prosthodontics and Periodontology, University of São Paulo, Bauru School of Dentistry, Bauru, SP, Brazil.
| | - Lukasz Witek
- Department of Biomaterials and Biomimetics, New York University College of Dentistry, New York, NY, USA; Department of Biomedical Engineering - NYU Tandon School of Engineering, New York University, Brooklyn, NY, USA
| | - Estevam A Bonfante
- Department of Prosthodontics and Periodontology, University of São Paulo, Bauru School of Dentistry, Bauru, SP, Brazil
| | - Charles Marin
- Department of Oral Surgery, Federal University of Santa Catarina, Florianopolis, SC, Brazil
| | - Michael Greenberg
- Department of Biomaterials and Biomimetics, New York University College of Dentistry, New York, NY, USA
| | - Gregory Kurgansky
- Department of Biomaterials and Biomimetics, New York University College of Dentistry, New York, NY, USA
| | - Paulo G Coelho
- Department of Mechanical and Aerospace Engineering - NYU Tandon School of Engineering, Brooklyn, NY, USA; Hansjörg Wyss Department of Plastic Surgery, NYU Langone Health School of Medicine, New York, NY, USA
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Benalcazar Jalkh EB, Monteiro KN, Cesar PF, Genova LA, Bergamo ETP, Lopes ACDO, Lima E, Lisboa-Filho PN, Campos TMB, Witek L, Coelho PG, Borges AFS, Bonfante EA. Aging resistant ZTA composite for dental applications: Microstructural, optical and mechanical characterization. Dent Mater 2020; 36:1190-1200. [PMID: 32561117 DOI: 10.1016/j.dental.2020.05.011] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/09/2019] [Revised: 05/03/2020] [Accepted: 05/24/2020] [Indexed: 02/04/2023]
Abstract
OBJECTIVE To synthesize a zirconia toughened alumina (ZTA) composite with 70% alumina reinforced by 30% zirconia for dental applications and to characterize its microstructure and optical properties for comparison with the isolated counterpart materials and a first-generation 3Y-TZP. METHODS Disc-shaped specimens were divided in four groups (n = 70/material): (1) 3YSB-E (first generation 3Y-TZP), (2) Zpex (second generation 3Y-TZP), (3) alumina, and (4) ZTA-Zpex 70/30. After synthesis, ceramic powders were pressed, and green-body samples sintered following a predetermined protocol. Specimens were polished to obtain a mirror surface finish. Apparent density was measured by Archimedes principle. X-ray diffraction (XRD) and scanning electron microscope (SEM) were used to characterize the crystalline content and microstructure. Reflectance tests were performed to determine the contrast-ratio (CR) and translucency-parameter (TP). Mechanical properties were assessed by biaxial flexural strength (BFS) test. All analyses were conducted before and after artificial aging (20 h, 134 °C, 2.2 bar). Optical parameters were evaluated through repeated-measures analysis of variance and Tukey tests (p < 0.05). BFS data were analyzed using Weibull statistics (95% CI). RESULTS High density values (95-99%) were found for all ceramic materials and SEM images exhibited a dense microstructure. While XRD patterns revealed the preservation of crystalline content in the ZTA composite, an increase in the monoclinic peak was observed for pure zirconias after aging. Significantly higher CR and lower TP values were observed for the ZTA composite, followed by alumina, 3YSB-E, and Zpex. The highest characteristic stress was recorded for 3YSB-E, followed by intermediate values between ZTA and Zpex, and the lowest for alumina. Aging affected the optical and mechanical properties of both zirconias, while remained stable for ZTA composite and alumina. SIGNIFICANCE The synthesis of experimental 70-30% ZTA composite was successful and its relevance for dental applications relies on its higher masking ability, aging resistance, and strength similar to zirconia.
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Affiliation(s)
- Ernesto Byron Benalcazar Jalkh
- Department of Prosthodontics and Periodontology, University of São Paulo, Bauru School of Dentistry, Bauru, SP, Brazil; Department of Biomaterials and Biomimetics, New York University College of Dentistry, New York, NY, USA.
| | - Kelli Nunes Monteiro
- Department of Biomaterials and Oral Biology, University of São Paulo, School of Dentistry, SP, Brazil
| | - Paulo Francisco Cesar
- Department of Biomaterials and Oral Biology, University of São Paulo, School of Dentistry, SP, Brazil
| | | | - Edmara T P Bergamo
- Department of Prosthodontics and Periodontology, University of São Paulo, Bauru School of Dentistry, Bauru, SP, Brazil
| | | | - Erick Lima
- Department of Biomaterials and Oral Biology, University of São Paulo, School of Dentistry, SP, Brazil
| | | | | | - Lukasz Witek
- Department of Biomaterials and Biomimetics, New York University College of Dentistry, New York, NY, USA; Department of Biomedical Engineering, New York University, Tandon School of Engineering, Brooklyn, NY, USA
| | - Paulo G Coelho
- Department of Biomaterials and Biomimetics, New York University College of Dentistry, New York, NY, USA; Hansjörg Wyss Department of Plastic Surgery, NYU Langone Medical Center, New York, NY, USA; Mechanical and Aerospace Engineering, NYU Tandon School of Engineering, New York, NY, USA
| | - Ana Flavia Sanches Borges
- Department of Operative Dentistry, Endodontics and Dental Materials, University of São Paulo - Bauru School of Dentistry, Bauru, SP, Brazil
| | - Estevam A Bonfante
- Department of Prosthodontics and Periodontology, University of São Paulo, Bauru School of Dentistry, Bauru, SP, Brazil
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Lorenzoni FC, Bonfante EA, Valverde GB, Coelho PG, Bonfante G, Thompson VP, Silva NRFA. Effect of indenter material on reliability of all-ceramic crowns. J Mech Behav Biomed Mater 2020; 108:103831. [PMID: 32469725 DOI: 10.1016/j.jmbbm.2020.103831] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/18/2020] [Revised: 04/21/2020] [Accepted: 04/23/2020] [Indexed: 10/24/2022]
Abstract
OBJECTIVES Controversy exists about whether the elastic modulus (E) mismatch between the loading indenter and ceramic materials influences fatigue testing results. The research hypotheses were that for porcelain veneered Y-TZP crowns 1) A low modulus Steatite indenter (SB) leads to higher fatigue reliability compared to a high modulus tungsten carbide indenter (WC); 2) Different surface damage patterns are expected between low and high modulus indenters after sliding contact fatigue testing. All ceramic crowns will exhibit similar step-stress accelerated life testing (SSALT) contact fatigue reliability (hypothesis 1) and failure characteristics (hypothesis 2) when using high stiffness tungsten carbide (WC, E = 600 GPa) vs. enamel like steatite (SB, E = 90 GPa) indenters. METHODS Manufacturer (3M Oral Care) prepared Y-TZP-veneered all-ceramic molar crowns were bonded to aged resin composite reproductions of a standard tooth preparation and subjected to mouth-motion SSALT fatigue (n = 18 per indenter type). Failure was defined either as initial inner cone crack (IC), or final fracture (FF) when porcelain fractured (chipping). Selected IC specimens that did not progress to FF were embedded in epoxy resin and sectioned for fractographic analysis. RESULTS The distribution of failures across the load and cycle profiles lead to similar calculated Weibull Use Level Probability Plots with overlap of the 2-sided 90% confidence bounds. The calculated reliability for IC and FF was equivalent at a mission of 300 N or 700 N load and 50,000 cycles, although the WC indenter had a trend for lower reliability for IC at 700 N. Both indenters produced similar patterns of wear and cracking on crown surfaces. Fractographic landmarks showed competing failure modes, but sliding contact partial inner cone cracks were the most dominant for both groups. SIGNIFICANCE The more compliant Steatite indenter had similar veneered crown fatigue reliability and failure modes to those found with use of a high stiffness tungsten carbide indenter (hypotheses 1 and 2 rejected).
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Affiliation(s)
- Fabio C Lorenzoni
- Department of Prosthodontics, Unigran University School of Dentistry, Dourados, MS, Brazil; Lorenzoni Education Institute, Ponta Porã, MS, Brazil
| | - Estevam A Bonfante
- Department of Prosthodontics and Periodontology, University of São Paulo Bauru School of Dentistry, Bauru, Brazil.
| | - Guilherme B Valverde
- Assistant Professor - Advanced Education in Esthetic and Operative Dentistry, Tufts School of Dental Medicine, Boston, MA, USA, Private Practice, Newton Dental
| | - Paulo G Coelho
- Department of Biomaterials, Hansjörg Wyss Department of Plastic Surgery, Mechanical and Aerospace Engineering, New York University, New York City, New York, USA
| | - Gerson Bonfante
- Department of Prosthodontics and Periodontology, University of São Paulo Bauru School of Dentistry, Bauru, Brazil
| | - Van P Thompson
- Professor Emeritus King's College London Faculty of Dentistry Department of Tissue Engineering and Biophotonics London, UK
| | - Nelson R F A Silva
- Department of Restorative Dentistry, Federal University of Minas Gerais, FO/UFMG, Brazil
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Ferreira I, Vidal CL, Botelho AL, Ferreira PS, Valente MLDC, Schiavon MA, Alves OL, Dos Reis AC. Effect of nanomaterial incorporation on the mechanical and microbiological properties of dental porcelain. J Prosthet Dent 2020; 123:529.e1-529.e5. [PMID: 31952862 DOI: 10.1016/j.prosdent.2019.10.012] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/17/2019] [Revised: 10/08/2019] [Accepted: 10/08/2019] [Indexed: 01/18/2023]
Abstract
STATEMENT OF PROBLEM Dental porcelain restorations are subject to biological failures related to secondary caries and periodontal disease leading to prosthesis replacement. PURPOSE The purpose of this in vitro study was to explore the microbiological and mechanical properties of dental porcelain incorporated with different percentages of silver vanadate (β-AgVO3) through microbiological analysis, roughness tests, and the Vickers microhardness test. MATERIAL AND METHODS IPS InLine porcelain specimens were made by using a cylindrical Teflon matrix in the dimensions of 8×2 mm. For the control group, the porcelain was manipulated according to the manufacturer's instructions. The groups incorporating the nanomaterial were prepared with 2.5%, 5%, and 10% of β-AgVO3, which was added proportionally by mass to the porcelain powder. In vitro microbiologic analysis, roughness tests, and the Vickers microhardness test were performed. RESULTS Against Streptococcus mutans, the control group showed no inhibition halo (0 mm). All groups with AgVO3 showed a zone of inhibition, the highest for the group with 10% (30 mm) and then the groups with 2.5% (9 mm) and 5% (17 mm). For Vickers microhardness, no statistically significant difference (P<.05) was observed between the evaluated groups. The group with 10% of AgVO3 had the highest mean roughness and was statistically different (P<.001) from the other groups. CONCLUSIONS Adding β-AgVO3 to dental porcelain demonstrated antimicrobial effectiveness at all concentrations (2.5%, 5%, and 10%), with no effect on Vickers microhardness. The 10% group had higher roughness than the other groups.
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Affiliation(s)
- Izabela Ferreira
- Student, Department of Dental Materials and Prosthodontics, Ribeirão Preto Dental School, University of São Paulo (USP), Ribeirão Preto, Brazil
| | - Carla Larissa Vidal
- Graduate student, Department of Dental Materials and Prosthodontics, Ribeirão Preto Dental School, University of São Paulo (USP), Ribeirão Preto, Brazil
| | - André Luís Botelho
- Postdoctoral student, Department of Dental Materials and Prosthodontics, Ribeirão Preto Dental School, University of São Paulo (USP), Ribeirão Preto, Brazil
| | - Paulo Sérgio Ferreira
- Laboratory Technician, Department of Dental Materials and Prosthodontics, Ribeirão Preto Dental School, University of São Paulo (USP), Ribeirão Preto, Brazil
| | - Mariana Lima da Costa Valente
- Postdoctoral student, Department of Dental Materials and Prosthodontics, Ribeirão Preto Dental School, University of São Paulo (USP), Ribeirão Preto, Brazil
| | - Marco Antonio Schiavon
- Professor, Department of Natural Sciences, Federal University of São João del-Rei (UFSJ), São João del-Rei, Brazil
| | - Oswaldo Luiz Alves
- Professor, Department of Inorganic Chemistry, State University of Campinas (UNICAMP), São Paolo, Brazil
| | - Andréa Cândido Dos Reis
- Professor, Department of Dental Materials and Prosthodontics, Ribeirão Preto Dental School, University of São Paulo (USP), Ribeirão Preto, Brazil.
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11
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Effect of Incisal Porcelain Veneering Thickness on the Fracture Resistance of CAD/CAM Zirconia All-Ceramic Anterior Crowns. Int J Dent 2019; 2019:6548519. [PMID: 31534456 PMCID: PMC6732585 DOI: 10.1155/2019/6548519] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/04/2019] [Accepted: 05/21/2019] [Indexed: 11/17/2022] Open
Abstract
Statement of Problem. In some clinical situations, the vertical length of either a prepared tooth or an implant abutment is short, while the occlusal clearance to be restored by a porcelain crown is large. Incisal thickness of the veneering porcelain should be considered to prevent mechanical failure of the crown. Purpose. The aim of this study is to evaluate the effect of two different incisal veneering porcelain thickness on the fracture resistance of the anterior all-ceramic CAD/CAM zirconia crown system as compared with the conventionally used metal ceramic crown system. Method. CAD/CAM zirconia all-ceramic and metal ceramic crowns were fabricated on the prepared dies with standardized dimensions and designs using standardized methods according to the manufacturer’s instructions. All crowns were then adhesively luted with resin-based cement (Multilink cement system), subjected to thermal cycling and cyclic loading, and were loaded until fracture using the universal testing machine to indicate the fracture resistance for each crown material in each veneering thickness. Results. Statistical analysis was carried out, and the results showed that the fracture resistance of the nickel-chromium metal ceramic group was significantly higher than that of the CAD/CAM zirconia all-ceramic group. Also, the fracture resistance of crowns with 1.5 mm incisal veneering thickness was significantly higher than those with 3 mm incisal veneering thickness in both groups. Furthermore, there was no significant difference in the fracture mode of the two groups where 50% of the total specimens demonstrated Mode II (veneer chipping), while 35% demonstrated Mode I (visible crack) and only 15% demonstrated Mode III (bulk fracture). Conclusion. High failure load values were demonstrated by the specimens in this study, which suggest sufficient strength of both incisal veneering thickness in both crown systems to withstand clinical applications; however, the fracture patterns still underline the requirement of a core design that support a consistent thickness of the veneering ceramic, and it is recommended to conduct long-term prospective clinical studies to confirm findings reported in the present study.
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Bergamo ET, Bordin D, Ramalho IS, Lopes AC, Gomes RS, Kaizer M, Witek L, Bonfante EA, Coelho PG, Del Bel Cury AA. Zirconia-reinforced lithium silicate crowns: Effect of thickness on survival and failure mode. Dent Mater 2019; 35:1007-1016. [DOI: 10.1016/j.dental.2019.04.007] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/01/2018] [Revised: 02/12/2019] [Accepted: 04/12/2019] [Indexed: 10/26/2022]
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Miranda JS, de Carvalho RLA, de Carvalho RF, Borges ALS, Bottino MA, Özcan M, Melo RMD, Souza RODAE. Effect of different loading pistons on stress distribution of a CAD/CAM silica-based ceramic: CAD-FEA modeling and fatigue survival analysis. J Mech Behav Biomed Mater 2019; 94:207-212. [DOI: 10.1016/j.jmbbm.2019.03.011] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/01/2018] [Revised: 03/14/2019] [Accepted: 03/15/2019] [Indexed: 11/24/2022]
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14
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Lifetime prediction of veneered versus monolithic lithium disilicate crowns loaded on marginal ridges. Dent Mater 2019; 35:511-522. [DOI: 10.1016/j.dental.2019.01.007] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/04/2018] [Revised: 12/02/2018] [Accepted: 01/11/2019] [Indexed: 11/19/2022]
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15
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Toyama DY, Alves LMM, Ramos GF, Campos TMB, de Vasconcelos G, Borges ALS, de Melo RM. Bioinspired silica-infiltrated zirconia bilayers: Strength and interfacial bonding. J Mech Behav Biomed Mater 2019; 89:143-149. [DOI: 10.1016/j.jmbbm.2018.09.013] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/25/2018] [Revised: 08/24/2018] [Accepted: 09/11/2018] [Indexed: 01/12/2023]
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16
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Reginato VF, Kemmoku DT, Caldas RA, Bacchi A, Pfeifer CS, Consani RLX. Characterization of Residual Stresses in Veneering Ceramics for Prostheses with Zirconia Framework. Braz Dent J 2018; 29:347-353. [PMID: 30462760 DOI: 10.1590/0103-6440201801990] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/06/2017] [Accepted: 04/13/2018] [Indexed: 11/22/2022] Open
Abstract
The aim of this study was to evaluate the influence of the coefficient of thermal expansion (CTE or α) and glass transition temperature (Tg) of three veneering ceramics used with zirconia frameworks of full-arch fixed prostheses. The generation of residual stresses and linear contraction after the simulation of the cooling process and mechanical loading were measured. The analysis was based on the finite element method in three-dimensional model of a maxillary full-arch fixed prosthesis with zirconia framework (e.max ZirCAD) and veneer by felsdpathic ceramics (GEC - IPS e.max Ceram, GVM - Vita VM9 and GLC - Lava Ceram). The linear contraction simulation was performed by cooling the structures from the Tg of each veneer ceramic at room temperature (25°C). A loading of 100 N on the occlusal region of the first molar was performed. The magnitude of the maximum principal stress (smax) and linear contraction were evaluated. The levels of CTE mismatch between veneering ceramics and framework showed no relevant influence on smax and linear contraction. The Tg values of the veneer ceramic showed to be directly proportional to amount of smax and linear contraction. The GEC presented the highest values of smax and linear contraction. The GVM and GLC did not present significant differences between them. In conclusion, GVM was similar to GLC, while GEC presented differences in relation to other veneer ceramics in terms of residual stress and linear contraction.
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Affiliation(s)
- Vagner Flávio Reginato
- Department of Prosthodontics and Periodontology, Piracicaba Dental School, UNICAMP - Universidade Estadual de Campinas, Piracicaba, SP, Brazil
| | | | - Ricardo Armini Caldas
- Department of Prosthodontics and Periodontology, Piracicaba Dental School, UNICAMP - Universidade Estadual de Campinas, Piracicaba, SP, Brazil
| | - Ataís Bacchi
- Department of Prosthodontics, IMED - Faculdade Meridional, Passo Fundo, RS, Brazil
| | - Carmem Silvia Pfeifer
- Department of Restorative Dentistry, Division of Biomaterials and Biomechanics, Oregon Healthand Science University, Portland, OR, USA
| | - Rafael Leonardo Xediek Consani
- Department of Prosthodontics and Periodontology, Piracicaba Dental School, UNICAMP - Universidade Estadual de Campinas, Piracicaba, SP, Brazil
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17
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Abstract
Zirconia‐based restorations are showing an increase as the clinicians’ preferred choice at posterior sites because of the strength and esthetic properties of such restorations. However, all‐ceramic restorations fracture at higher rates than do metal‐based restorations. Margin design is one of several factors that can affect the fracture strength of all‐ceramic restorations. The aim of this study was to assess the effect of preparation and crown margin design on fracture resistance. Four groups of bilayer zirconia crowns (with 10 crowns in each group) were produced by hard‐ or soft‐machining technique, with the following four different margin designs: chamfer preparation (control); slice preparation; slice preparation with an additional cervical collar of 0.7 mm thickness; and reduced occlusal thickness (to 0.4 mm) on slice preparation with an additional cervical collar of 0.7 mm thickness. Additionally, 10 hard‐machined crowns with slice preparation were veneered and glazed with feldspathic porcelain. In total, 90 crowns were loaded centrally in the occlusal fossa until fracture. The load at fracture was higher than clinically relevant mastication loads for all preparation and margin designs. The crowns on a chamfer preparation fractured at higher loads compared with crowns on a slice preparation. An additional cervical collar increased load at fracture for hard‐machined crowns.
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Affiliation(s)
- Anneli Skjold
- Department of Clinical Dentistry, Faculty of Medicine, University of Bergen, Bergen, Norway
| | - Christian Schriwer
- Department of Clinical Dentistry, Faculty of Medicine, University of Bergen, Bergen, Norway
| | - Marit Øilo
- Department of Clinical Dentistry, Faculty of Medicine, University of Bergen, Bergen, Norway
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18
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Fardin VP, Bonfante EA, Coelho PG, Janal MN, Tovar N, Witek L, Bordin D, Bonfante G. Residual stress of porcelain-fused to zirconia 3-unit fixed dental prostheses measured by nanoindentation. Dent Mater 2017; 34:260-271. [PMID: 29258696 DOI: 10.1016/j.dental.2017.11.013] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/10/2017] [Revised: 08/12/2017] [Accepted: 11/09/2017] [Indexed: 11/30/2022]
Abstract
OBJECTIVE To evaluate the residual stress (nanoindentation based on hardness) of fatigued porcelain-fused to zirconia 3-unit fixed dental prostheses (FDP) with different framework designs. METHODS Twenty maxillary 3-unit FDP replacing second-premolar (pontic) were fabricated with conventional framework-design (even-thickness of 0.5mm and 9mm2 connector area) and modified framework-design (thickness of 0.5mm presenting lingual collar connected to proximal struts and 12mm2 connector area). Connector marginal ridges were loaded and the fractured and suspended FDPs were divided (n=3/each) into: (1) Fractured zirconia even-thickness (ZrEvenF); (2) Suspended zirconia even-thickness (ZrEvenS); (3) Fractured zirconia with modified framework (ZrModF); (4) Suspended zirconia with modified framework (ZrModS); (5) Non-fatigued FDP with conventional framework design (Control). The FDPs were nanoindented at 0.03mm (Region of Interest (ROI) 1), 0.35mm (ROI 2) and 1.05mm (ROI 3) distances from porcelain veneer outer surface with peak load 4000μN. The Linear Mixed Analysis of Variance (ANOVA) Model on ranks and Least Significant Difference Test on ranks (95%) were used. RESULTS Highest rank hardness values were found for Control group and ZrModS, whereas the lowest values were found in ZrModF. Statistical differences (p=0.000) were found among all groups except for comparison between ZrModS and Control group (p=0.371). Hardness between ROIs were statistically significant different (p<0.001) where ROI 1 presented the lowest values. SIGNIFICANCE Framework-design modification did not influence the residual stress of porcelain-fused to zirconia fatigued 3-unit FDP. Whereas fractured FDPs showed the highest residual stress compared to suspended and control FDPs. Residual stress increased as nanoindented away from framework.
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Affiliation(s)
- Vinicius P Fardin
- Department of Prosthodontics, University of Vila Velha, Vila Velha, ES, Brazil; Department of Prosthodontics and Periodontology, University of São Paulo - Bauru School of Dentistry, Bauru, SP, Brazil.
| | - Estevam A Bonfante
- Department of Prosthodontics and Periodontology, University of São Paulo - Bauru School of Dentistry, Bauru, SP, Brazil
| | - Paulo G Coelho
- Department of Biomaterials and Biomimetics, New York University, New York, NY, USA; Hansjörg Wyss Department of Plastic Surgery, NYU Langone Medical Center, New York, NY, USA
| | - Malvin N Janal
- Department of Epidemiology and Health Promotion, New York University College of Dentistry, New York, NY, USA
| | - Nick Tovar
- Department of Biomaterials and Biomimetics, New York University, New York, NY, USA
| | - Lukasz Witek
- Department of Biomaterials and Biomimetics, New York University, New York, NY, USA
| | - Dimorvan Bordin
- Department of Operative Dentistry, Guarulhos University, Guarulhos, SP, Brazil
| | - Gerson Bonfante
- Department of Prosthodontics and Periodontology, University of São Paulo - Bauru School of Dentistry, Bauru, SP, Brazil
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Nikzadjamnani S, Azari A, Niakan S, Namdar SF. Fracture Resistance of Zirconia Restorations with a Modified Framework Design. JOURNAL OF DENTISTRY (TEHRAN, IRAN) 2017; 14:321-328. [PMID: 29942326 PMCID: PMC6015594] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 12/02/2022]
Abstract
OBJECTIVES Chipping is one of the concerns related to zirconia crowns. The reasons of chipping have not been completely understood. This in-vitro study aimed to assess the effect of coping design on the fracture resistance of all-ceramic single crowns with zirconia frameworks. MATERIALS AND METHODS Two types of zirconia copings were designed (n=12): (1) a standard coping (SC) with a 0.5mm uniform thickness and (2) a modified coping (MC) consisted of a lingual margin of 1mm thickness and 2mm height connected to a proximal strut of 4mm height and a 0.3mm-wide facial collar. After veneer porcelain firing, the crowns were cemented to metal dies. Afterwards, a static vertical load was applied until failure. The modes of failure were determined. Data were calculated and statistically analyzed by independent samples T-test. P<0.05 was considered statistically significant. RESULTS The mean and standard deviation (SD) of the final fracture resistance equaled to 3519.42±1154.96 N and 3570.01±1224.33 N in SC and MC groups, respectively; the difference was not statistically significant (P=0.9). Also, the mean and SD of the initial fracture resistance equaled to 3345.34±1190.93 N and 3471.52±1228.93 N in SC and MC groups, respectively (P=0.8). Most of the specimens in both groups showed the mixed failure mode. CONCLUSIONS Based on the results, the modified core design may not significantly improve the fracture resistance.
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Affiliation(s)
- Sakineh Nikzadjamnani
- Associate Professor, Dental Research Center, Dentistry Research Institute, Tehran University of Medical Sciences, Tehran, Iran; Department of Prosthodontics, School of Dentistry, Tehran University of Medical Sciences, Tehran, Iran
| | - Abbas Azari
- Associate Professor, Dental Research Center, Dentistry Research Institute, Tehran University of Medical Sciences, Tehran, Iran; Department of Prosthodontics, School of Dentistry, Tehran University of Medical Sciences, Tehran, Iran
| | - Somayeh Niakan
- Assistant Professor, Department of Prosthodontics, School of Dentistry, Tehran University of Medical Sciences, Tehran, Iran,Corresponding author: S. Niakan, Department of Prosthodontics, School of Dentistry, Tehran University of Medical Sciences, Tehran, Iran,
| | - Seyedeh Fatemeh Namdar
- Assistant Professor, Dental Materials Research Center, Mashhad University of Medical Sciences, Mashhad, Iran
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Choi JW, Kim SY, Bae JH, Bae EB, Huh JB. In vitro study of the fracture resistance of monolithic lithium disilicate, monolithic zirconia, and lithium disilicate pressed on zirconia for three-unit fixed dental prostheses. J Adv Prosthodont 2017; 9:244-251. [PMID: 28874990 PMCID: PMC5582089 DOI: 10.4047/jap.2017.9.4.244] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/04/2016] [Revised: 02/17/2017] [Accepted: 03/15/2017] [Indexed: 11/25/2022] Open
Abstract
PURPOSE The purpose of this study was to determine fracture resistance and failure modes of three-unit fixed dental prostheses (FDPs) made of lithium disilicate pressed on zirconia (LZ), monolithic lithium disilicate (ML), and monolithic zirconia (MZ). MATERIALS AND METHODS Co-Cr alloy three-unit metal FDPs model with maxillary first premolar and first molar abutments was fabricated. Three different FDPs groups, LZ, ML, and MZ, were prepared (n = 5 per group). The three-unit FDPs designs were identical for all specimens and cemented with resin cement on the prepared metal model. The region of pontic in FDPs was given 50,000 times of cyclic preloading at 2 Hz via dental chewing simulator and received a static load until fracture with universal testing machine fixed at 10°. The fracture resistance and mode of failure were recorded. Statistical analyses were performed using the Kruskal-Wallis test and Mann-Whitney U test with Bonferroni's correction (α=0.05/3=0.017). RESULTS A significant difference in fracture resistance was found between LZ (4943.87 ± 1243.70 N) and ML (2872.61 ± 658.78 N) groups, as well as between ML and MZ (4948.02 ± 974.51 N) groups (P<.05), but no significant difference was found between LZ and MZ groups (P>.05). With regard to fracture pattern, there were three cases of veneer chipping and two interfacial fractures in LZ group, and complete fracture was observed in all the specimens of ML and MZ groups. CONCLUSION Compared to monolithic lithium disilicate FDPs, monolithic zirconia FDPs and lithium disilicate glass ceramics pressed on zirconia-based FDPs showed superior fracture resistance while they manifested comparable fracture resistances.
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Affiliation(s)
- Jae-Won Choi
- Department of Prosthodontics, Dental Research Institute, Institute of Translation Dental Science, School of Dentistry, Pusan National University, Yangsan, Republic of Korea.,BK21 PLUS Project, School of Dentistry, Pusan National University, Yangsan, Republic of Korea
| | - So-Yeun Kim
- Department of Prosthodontics, Pusan National University Hospital, Pusan, Republic of Korea
| | - Ji-Hyeon Bae
- Department of Prosthodontics, Dental Research Institute, Institute of Translation Dental Science, School of Dentistry, Pusan National University, Yangsan, Republic of Korea.,BK21 PLUS Project, School of Dentistry, Pusan National University, Yangsan, Republic of Korea
| | - Eun-Bin Bae
- Department of Prosthodontics, Dental Research Institute, Institute of Translation Dental Science, School of Dentistry, Pusan National University, Yangsan, Republic of Korea.,BK21 PLUS Project, School of Dentistry, Pusan National University, Yangsan, Republic of Korea
| | - Jung-Bo Huh
- Department of Prosthodontics, Dental Research Institute, Institute of Translation Dental Science, School of Dentistry, Pusan National University, Yangsan, Republic of Korea
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Tang YL, Kim JH, Shim JS, Kim S. The effect of different cooling rates and coping thicknesses on the failure load of zirconia-ceramic crowns after fatigue loading. J Adv Prosthodont 2017; 9:152-158. [PMID: 28680545 PMCID: PMC5483400 DOI: 10.4047/jap.2017.9.3.152] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/14/2016] [Revised: 10/16/2016] [Accepted: 11/17/2016] [Indexed: 12/04/2022] Open
Abstract
PURPOSE The purpose of this study was to evaluate the influence of different coping thicknesses and veneer ceramic cooling rates on the failure load of zirconia-ceramic crowns. MATERIALS AND METHODS Zirconia copings of two different thicknesses (0.5 mm or 1.5 mm; n=20 each) were fabricated from scanning 40 identical abutment models using a dental computer-aided design and computer-aided manufacturing system. Zirconia-ceramic crowns were completed by veneering feldspathic ceramics under different cooling rates (conventional or slow, n=20 each), resulting in 4 different groups (CONV05, SLOW05, CONV15, SLOW15; n=10 per group). Each crown was cemented on the abutment. 300,000 cycles of a 50-N load and thermocycling were applied on the crown, and then, a monotonic load was applied on each crown until failure. The mean failure loads were evaluated with two-way analysis of variance (P=.05). RESULTS No cohesive or adhesive failure was observed after fatigue loading with thermocycling. Among the 4 groups, SLOW15 group (slow cooling and 1.5 mm chipping thickness) resulted in a significantly greater mean failure load than the other groups (P<.001). Coping fractures were only observed in SLOW15 group. CONCLUSION The failure load of zirconia-ceramic crowns was significantly influenced by cooling rate as well as coping thickness. Under conventional cooling conditions, the mean failure load was not influenced by the coping thickness; however, under slow cooling conditions, the mean failure load was significantly influenced by the coping thickness.
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Affiliation(s)
- Yu Lung Tang
- Nonsan Yonsei Suite Dental Clinic, Nonsan, Chungnam, Republic of Korea
| | - Jee-Hwan Kim
- Department of Prosthodontics, Yonsei University Dental Hospital, College of Dentistry, Yonsei University, Seoul, Republic of Korea
| | - June-Sung Shim
- Department of Prosthodontics, Yonsei University Dental Hospital, College of Dentistry, Yonsei University, Seoul, Republic of Korea
| | - Sunjai Kim
- Department of Prosthodontics, Gangnam Severance Dental Hospital, College of Dentistry, Yonsei University, Seoul, Republic of Korea
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Elshiyab SH, Nawafleh N, George R. Survival and testing parameters of zirconia-based crowns under cyclic loading in an aqueous environment: A systematic review. ACTA ACUST UNITED AC 2017; 8. [DOI: 10.1111/jicd.12261] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/18/2016] [Accepted: 01/07/2017] [Indexed: 01/08/2023]
Affiliation(s)
- Shareen Hayel Elshiyab
- School of Dentistry and Oral Health; Griffith University; Gold Coast Qld Australia
- Faculty of Applied Medical Sciences; Jordan University of Science and Technology; Irbid Jordan
| | - Noor Nawafleh
- School of Dentistry and Oral Health; Griffith University; Gold Coast Qld Australia
- Faculty of Applied Medical Sciences; Jordan University of Science and Technology; Irbid Jordan
| | - Roy George
- School of Dentistry and Oral Health; Griffith University; Gold Coast Qld Australia
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23
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Soares LM, Soares C, Miranda ME, Basting RT. Influence of Core-Veneer Thickness Ratio on the Fracture Load and Failure Mode of Zirconia Crowns. J Prosthodont 2017; 28:209-215. [DOI: 10.1111/jopr.12601] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 01/07/2017] [Indexed: 11/30/2022] Open
Affiliation(s)
- Luciana Mara Soares
- Department of Restorative Dentistry; Herman Ostrow School of Dentistry of USC; Los Angeles CA
| | | | - Milton Edson Miranda
- Department of Prosthodontics; São Leopoldo Mandic Institute and Dental Research Center; Campinas São Paulo Brazil
| | - Roberta Tarkany Basting
- Department of Restorative Dentistry; São Leopoldo Mandic Institute and Dental Research Center; Campinas São Paulo Brazil
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Fardin VP, de Paula VG, Bonfante EA, Coelho PG, Bonfante G. Lifetime prediction of zirconia and metal ceramic crowns loaded on marginal ridges. Dent Mater 2016; 32:1543-1554. [DOI: 10.1016/j.dental.2016.09.004] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/17/2016] [Revised: 08/19/2016] [Accepted: 09/03/2016] [Indexed: 10/20/2022]
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25
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Özcan M, Jonasch M. Effect of Cyclic Fatigue Tests on Aging and Their Translational Implications for Survival of All-Ceramic Tooth-Borne Single Crowns and Fixed Dental Prostheses. J Prosthodont 2016; 27:364-375. [DOI: 10.1111/jopr.12566] [Citation(s) in RCA: 33] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 08/10/2016] [Indexed: 11/29/2022] Open
Affiliation(s)
- Mutlu Özcan
- Dental Materials Unit, Center for Dental and Oral Medicine; Clinic for Fixed and Removable Prosthodontics and Dental Materials Science, University of Zürich; Zurich Switzerland
| | - Moritz Jonasch
- Dental Materials Unit, Center for Dental and Oral Medicine; Clinic for Fixed and Removable Prosthodontics and Dental Materials Science, University of Zürich; Zurich Switzerland
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Calha N, Messias A, Guerra F, Martinho B, Neto MA, Nicolau P. Effect of geometry on deformation of anterior implant-supported zirconia frameworks: An in vitro study using digital image correlation. J Prosthodont Res 2016; 61:139-148. [PMID: 27667555 DOI: 10.1016/j.jpor.2016.08.004] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/28/2015] [Revised: 07/20/2016] [Accepted: 08/27/2016] [Indexed: 10/21/2022]
Abstract
PURPOSE To evaluate the effect of geometry on the displacement and the strain distribution of anterior implant-supported zirconia frameworks under static load using the 3D digital image correlation method. METHODS Two groups (n=5) of 4-unit zirconia frameworks were produced by CAD/CAM for the implant-abutment assembly. Group 1 comprised five straight configuration frameworks and group 2 consisted of five curved configuration frameworks. Specimens were cemented and submitted to static load up to 200N. Displacements were captured with two high-speed photographic cameras and analyzed with video correlation system in three spacial axes U, V, W. Statistical analysis was made using the nonparametric Mann-Whitney test. RESULTS Up to 150N loads, the vertical displacements (V axis) were statistically higher for curved frameworks (-267.83±23.76μm), when compared to the straight frameworks (-120.73±36.17μm) (p=0.008), as well as anterior displacements in the W transformed axis (589.55±64.51μm vs 224.29±50.38μm for the curved and straight frameworks), respectively (p=0.008). The mean von Mises strains over the surface frameworks were statistically higher for the curved frameworks under any load. CONCLUSION Within the limitations of this in vitro study, it is possible to conclude that the geometric configuration influences the deformation of 4-unit anterior frameworks under static load. The higher strain distribution and micro-movements of the curved frameworks reflect less rigidity and increased risk of fractures associated to FPDs.
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Affiliation(s)
- Nuno Calha
- Department of Dentistry, Faculty of Medicine, University of Coimbra, Portugal
| | - Ana Messias
- Department of Dentistry, Faculty of Medicine, University of Coimbra, Portugal; Centre for Mechanical Engineering, University of Coimbra, Portugal.
| | - Fernando Guerra
- Department of Dentistry, Faculty of Medicine, University of Coimbra, Portugal; Centre for Mechanical Engineering, University of Coimbra, Portugal
| | - Beatriz Martinho
- Department of Dentistry, Faculty of Medicine, University of Coimbra, Portugal
| | | | - Pedro Nicolau
- Department of Dentistry, Faculty of Medicine, University of Coimbra, Portugal; Centre for Mechanical Engineering, University of Coimbra, Portugal
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Influence of Different Framework Designs on the Fracture Properties of Ceria-Stabilized Tetragonal Zirconia/Alumina-Based All-Ceramic Crowns. MATERIALS 2016; 9:ma9050339. [PMID: 28773464 PMCID: PMC5503066 DOI: 10.3390/ma9050339] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/16/2016] [Revised: 04/25/2016] [Accepted: 04/29/2016] [Indexed: 11/16/2022]
Abstract
The aim of this study was to evaluate the fracture load and failure mode of all-ceramic crowns with different ceria-stabilized tetragonal zirconia/alumina nanocomposite (Ce-TZP/A) framework designs. Four frameworks (anatomical shape: AS, with a buccal or lingual supporting structure: BS and LS, or buccal and lingual supporting structures: BLS) were fabricated. All frameworks were veneered with porcelain to fabricate all-ceramic crowns followed by cementation to tooth analogs. The fracture load of each crown either without or with pre-loading (1.2 million cycles, 49 N) was measured. The failure mode was classified into partial or complete fracture. Differences were tested for significance (p < 0.05) by a two-way Analysis of Variance (ANOVA), followed by Tukey’s test and by Fisher’s exact test, respectively. Without pre-loading, supporting structures did not influence the fracture load or failure mode. Partial fractures were the most common failure mode. Pre-loading promoted the severity of the failure mode, although the fracture load among the framework designs was not influenced. In the AS group, prefailures were observed during pre-loading, and complete fractures were significantly increased after pre-loading. In contrast, the failure mode of the BLS group remained unchanged, showing only partial fracture even after pre-loading. This Ce-TZP/A framework design, comprised of an anatomical shape with additional buccal and lingual structures, has the potential to reduce the chipping of the veneering porcelain.
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Petersen R, Liu PR. 3D-WOVEN FIBER-REINFORCED COMPOSITE FOR CAD/CAM DENTAL APPLICATION. SAMPE JOURNAL. SOCIETY FOR THE ADVANCEMENT OF MATERIAL AND PROCESS ENGINEERING 2016; 2016:LB15--0138. [PMID: 27642198 PMCID: PMC5026051] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Three-dimensional (3D)-woven noncrimp fiber-reinforced composite (FRC) was tested for mechanical properties in the two principal directions of the main XY plane and compared to different Computer-Aided-Design/Computer-Aided-Machining (CAD/CAM) Dental Materials. The Dental Materials included ceramic with Vitablock Mark II®, ProCAD®, InCeram® Spinel, InCeram® Alumina and InCeram® Zirconia in addition to a resin-based 3M Corp. Paradigm® particulate-filled composite. Alternate material controls included Coors 300 Alumina Ceramic and a tungsten carbide 22% cobalt cermet. The 3D-woven FRC was vacuum assisted resin transfer molding processed as a one-depth-thickness ~19-mm preform with a vinyl-ester resin and cut into blocks similar to the commercial CAD/CAM Dental Materials. Mechanical test samples prepared for a flexural three-point span length of 10.0 mm were sectioned for minimum-depth cuts to compare machinability and fracture resistance between groups. 3D-woven FRC improved mechanical properties with significant statistical differences over all CAD/CAM Dental Materials and Coors Alumina Ceramic for flexural strength (p<0.001), resilience (p<0.05), work of fracture (p<0.001), strain energy release (p<0.05), critical stress intensity factor (p<0.001) and strain (p<0.001).
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Affiliation(s)
- Richard Petersen
- University of Alabama at Birmingham, SDB 539, 1919 7 Avenue South, Birmingham, AL 35294
| | - Perng-Ru Liu
- University of Alabama at Birmingham, SDB 539, 1919 7 Avenue South, Birmingham, AL 35294
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Bonfante EA, Suzuki M, Hirata R, Bonfante G, Fardin VP, Coelho PG. Resin composite repair for implant-supported crowns. J Biomed Mater Res B Appl Biomater 2016; 105:1481-1489. [DOI: 10.1002/jbm.b.33683] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/18/2015] [Accepted: 03/29/2016] [Indexed: 11/06/2022]
Affiliation(s)
- Estevam A. Bonfante
- Department of Prosthodontics; University of São Paulo, Bauru College of Dentistry; Bauru SP Brazil
| | - Marcelo Suzuki
- Department of Operative Dentistry and Prosthodontics; Tufts University School of Dental Medicine; Boston Massachusetts
| | - Ronaldo Hirata
- Department of Biomaterials and Biomimetics; New York University College of Dentistry; New York New York 10010
| | - Gerson Bonfante
- Department of Prosthodontics; University of São Paulo, Bauru College of Dentistry; Bauru SP Brazil
| | - Vinicius P. Fardin
- Department of Prosthodontics; University of São Paulo, Bauru College of Dentistry; Bauru SP Brazil
- Department of Biomaterials and Biomimetics; New York University College of Dentistry; New York New York 10010
| | - Paulo G. Coelho
- Department of Biomaterials and Biomimetics; New York University College of Dentistry; New York New York 10010
- Director for Research; Department of Periodontology and Implant Dentistry; New York University College of Dentistry; New York New York
- Affiliated Faculty; Division of Engineering; New York University Abu Dhabi; Abu Dhabi United Arab Emirates
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30
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Spies BC, Kohal RJ, Balmer M, Vach K, Jung RE. Evaluation of zirconia-based posterior single crowns supported by zirconia implants: preliminary results of a prospective multicenter study. Clin Oral Implants Res 2016; 28:613-619. [DOI: 10.1111/clr.12842] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 03/06/2016] [Indexed: 11/29/2022]
Affiliation(s)
- Benedikt Christopher Spies
- Department of Prosthetic Dentistry; Center for Dental Medicine; Medical Center - University of Freiburg; Freiburg Germany
| | - Ralf-Joachim Kohal
- Department of Prosthetic Dentistry; Center for Dental Medicine; Medical Center - University of Freiburg; Freiburg Germany
| | - Marc Balmer
- Clinic of Fixed and Removable Prosthodontics and Dental Material Science; Center of Dental Medicine; University of Zurich; Zurich Switzerland
| | - Kirstin Vach
- Center for Medical Biometry and Medical Informatics; Institute for Medical Biometry and Statistics; Medical Center - University of Freiburg; Freiburg Germany
| | - Ronald E. Jung
- Clinic of Fixed and Removable Prosthodontics and Dental Material Science; Center of Dental Medicine; University of Zurich; Zurich Switzerland
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Silva NRFA, Teixeira HS, Silveira LM, Bonfante EA, Coelho PG, Thompson VP. Reliability and Failure Modes of a Hybrid Ceramic Abutment Prototype. J Prosthodont 2016; 27:83-87. [DOI: 10.1111/jopr.12461] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 12/12/2015] [Indexed: 11/26/2022] Open
Affiliation(s)
- Nelson RFA Silva
- Department of Restorative Dentistry; Federal University of Minas Gerais-School of Dentistry (UFMG/FO); Belo Horizonte Minas Gerais Brazil
| | - Hellen S. Teixeira
- Department of Biomaterials and Biomimetics; New York University College of Dentistry; New York NY
- Department of Orthodontics; University of Pennsylvania School of Dental Medicine; Philadelphia PA
| | - Lucas M. Silveira
- Department of Biomaterials and Biomimetics; New York University College of Dentistry; New York NY
| | - Estevam A. Bonfante
- Department of Prosthodontics; Bauru School of Dentistry; University of Sao Paulo; Bauru Sao Paulo Brazil
| | - Paulo G. Coelho
- Department of Biomaterials and Biomimetics; New York University College of Dentistry; New York NY
| | - Van P. Thompson
- Department of Tissue Engineering and Biophotonics; King's College London; Guy's Hospital London UK
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LUO H, TANG X, DONG Z, TANG H, NAKAMURA T, YATANI H. The influences of accelerated aging on mechanical properties of veneering ceramics used for zirconia restorations. Dent Mater J 2016; 35:187-93. [DOI: 10.4012/dmj.2015-115] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Affiliation(s)
- Huinan LUO
- Department of Stomatology, Jinling Hospital, Nanjing University School of Medicine
| | - Xuehua TANG
- Department of Stomatology, The First Affiliated Hospital of Nanjing Medical University
- Department of Fixed Prosthodontics, Osaka University Graduate School of Dentistry
| | - Zhen DONG
- Department of Stomatology, Jinling Hospital, Nanjing University School of Medicine
| | - Hui TANG
- Institute of Stomatology, Nanjing Medical University
| | - Takashi NAKAMURA
- Department of Fixed Prosthodontics, Osaka University Graduate School of Dentistry
| | - Hirofumi YATANI
- Department of Fixed Prosthodontics, Osaka University Graduate School of Dentistry
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Spies BC, Witkowski S, Butz F, Vach K, Kohal RJ. Bi-layered zirconia/fluor-apatite bridges supported by ceramic dental implants: a prospective case series after thirty months of observation. Clin Oral Implants Res 2015; 27:1265-1273. [DOI: 10.1111/clr.12731] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 10/17/2015] [Indexed: 11/28/2022]
Affiliation(s)
- Benedikt Christopher Spies
- Medical Center - University of Freiburg; Center for Dental Medicine; Department of Prosthetic Dentistry; Freiburg Germany
| | - Siegbert Witkowski
- Medical Center - University of Freiburg; Center for Dental Medicine; Department of Prosthetic Dentistry; Freiburg Germany
| | - Frank Butz
- Medical Center - University of Freiburg; Center for Dental Medicine; Department of Prosthetic Dentistry; Freiburg Germany
| | - Kirstin Vach
- Medical Center - University of Freiburg; Center for Medical Biometry and Medical Informatics; Institute for Medical Biometry and Statistics; Freiburg Germany
| | - Ralf-Joachim Kohal
- Medical Center - University of Freiburg; Center for Dental Medicine; Department of Prosthetic Dentistry; Freiburg Germany
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Ramos GF, Monteiro EBC, Bottino M, Zhang Y, de Melo RM. Failure Probability of Three Designs of Zirconia Crowns. INT J PERIODONT REST 2015; 35:843-9. [PMID: 26509988 PMCID: PMC4671273 DOI: 10.11607/prd.2448] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Abstract
This study used a two-parameter Weibull analysis for evaluation of the lifespan of fully or partially porcelain-/glaze-veneered zirconia crowns after fatigue test. A sample of 60 first molars were selected and prepared for full-coverage crowns with three different designs (n = 20): traditional (crowns with zirconia framework covered with feldspathic porcelain), modified (crowns partially covered with veneering porcelain), and monolithic (full-contour zirconia crowns). All specimens were treated with a glaze layer. Specimens were subjected to mechanical cycling (100 N, 3 Hz) with a piston with a hemispherical tip (Ø = 6 mm) until the specimens failed or up to 2 × 10⁶ cycles. Every 500,000 cycles, the fatigue tests were interrupted and stereomicroscopy (10×) was used to inspect the specimens for damage. The authors performed Weibull analysis of interval data to calculate the number of failures in each interval. The types and numbers of failures according to the groups were: cracking (13 traditional, 6 modified) and chipping (4 traditional) of the feldspathic porcelain, followed by delamination (1 traditional) at the veneer/core interface and debonding (2 monolithic) at the cementation interface. Weibull parameters (β, scale; η, shape), with a two-sided confidence interval of 95%, were: traditional-1.25 and 0.9 × 10⁶ cycles; modified-0.58 and 11.7 × 10⁶ cycles; and monolithic-1.05 and 16.5 × 10⁶ cycles. Traditional crowns showed greater susceptibility to fatigue, the modified group presented higher propensity to early failures, and the monolithic group showed no susceptibility to fatigue. The modified and monolithic groups presented the highest number of crowns with no failures after the fatigue test. The three crown designs presented significantly different behaviors under fatigue. The modified and monolithic groups presented less probability of failure after 2 × 10⁶ cycles.
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Affiliation(s)
- G. Freitas Ramos
- Institute of Science and Technology, São Paulo State University (UNESP), Sao Jose dos Campos, Brazil
| | | | - M.A. Bottino
- Institute of Science and Technology, São Paulo State University (UNESP), Sao Jose dos Campos, Brazil
| | - Y. Zhang
- Department of Biomaterials and Biomimetics, New York University College of Dentistry, New York, NY 10010, USA
| | - R. Marques de Melo
- Institute of Science and Technology, São Paulo State University (UNESP), Sao Jose dos Campos, Brazil
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Lan TH, Liu PH, Chou MMC, Lee HE. Fracture resistance of monolithic zirconia crowns with different occlusal thicknesses in implant prostheses. J Prosthet Dent 2015; 115:76-83. [PMID: 26412004 DOI: 10.1016/j.prosdent.2015.06.021] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/23/2015] [Revised: 06/17/2015] [Accepted: 06/24/2015] [Indexed: 11/24/2022]
Abstract
STATEMENT OF PROBLEM The use of monolithic zirconia crowns in implant prostheses is increasing, especially when the interdental space is insufficient. However, fractures have been reported in clinical practice. PURPOSE The purpose of this study was to determine the minimal thickness of a complete zirconia crown used for an implant prosthesis in the posterior dental region. MATERIAL AND METHODS Fifty complete zirconia crowns were produced using a computer-aided design/computer-aided manufacturing technique. In each group, 5 crowns of varying thicknesses (0.4, 0.5, 0.6, 0.7, and 0.8 mm) were subjected to cycles of vertical and 10-degree oblique compressive loading at 5 Hz and 300 N in a servohydraulic testing machine. Five finite element models comprising 5 different occlusal thicknesses (0.4, 0.5, 0.6, 0.7, and 0.8 mm) were simulated at 2 loading angles (0 and 10 degrees) and 3 loading forces (300, 500, and 800 N). Data were statistically analyzed, and fracture patterns were observed with a scanning electron microscope. RESULTS Cyclic loading tests revealed that the fracture resistance of the specimens was positively associated with prosthesis thickness (P<.01). Low von Mises stress values were obtained for prostheses with a minimal thickness of 0.7 mm under varying loading directions and forces. CONCLUSIONS Zirconia prostheses with a minimal thickness of 0.7 mm had a high fracture resistance and the lowest stress values. Therefore, dentists and laboratory technicians should carefully choose the optimum thickness of zirconia prostheses.
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Affiliation(s)
- Ting-Hsun Lan
- Attending Dentist, Department of Dentistry, Kaohsiung Medical University Hospital, Kaohsiung Taiwan; Assistant Professor, School of Dentistry, College of Dental Medicine, Kaohsiung Medical University, Kaohsiung, Taiwan.
| | - Pao-Hsin Liu
- Assistant Professor, Department of Biomedical Engineering, I-Shou University, Kaohsiung, Taiwan
| | - Mitch M C Chou
- Professor, Department of Materials & Opto-electronic Science, National Sun Yat-Sen University, Kaohsiung, Taiwan
| | - Huey-Er Lee
- Professor, School of Dentistry, College of Dental Medicine, Kaohsiung, Taiwan
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Rinke S, Kramer K, Bürgers R, Roediger M. A practice-based clinical evaluation of the survival and success of metal-ceramic and zirconia molar crowns: 5-year results. J Oral Rehabil 2015; 43:136-44. [DOI: 10.1111/joor.12348] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 08/24/2015] [Indexed: 12/22/2022]
Affiliation(s)
- S. Rinke
- Private Practice; Hanau Germany
- Department of Prosthodontics; Georg-August-University; Göttingen Germany
| | - K. Kramer
- Department of Medical Statistics; Georg-August-University; Göttingen Germany
| | - R. Bürgers
- Department of Prosthodontics; Georg-August-University; Göttingen Germany
| | - M. Roediger
- Department of Prosthodontics; Georg-August-University; Göttingen Germany
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Bonfante EA, Suzuki M, Lorenzoni FC, Sena LA, Hirata R, Bonfante G, Coelho PG. Probability of survival of implant-supported metal ceramic and CAD/CAM resin nanoceramic crowns. Dent Mater 2015; 31:e168-77. [DOI: 10.1016/j.dental.2015.05.006] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/19/2014] [Revised: 03/28/2015] [Accepted: 05/15/2015] [Indexed: 01/22/2023]
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López-Suárez C, Gonzalo E, Peláez J, Rodríguez V, Suárez MJ. Fracture resistance and failure mode of posterior fixed dental prostheses fabricated with two zirconia CAD/CAM systems. J Clin Exp Dent 2015; 7:e250-3. [PMID: 26155341 PMCID: PMC4483332 DOI: 10.4317/jced.52067] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/20/2014] [Accepted: 02/05/2015] [Indexed: 11/29/2022] Open
Abstract
Background In recent years there has been an improvement of zirconia ceramic materials to replace posterior missing teeth. To date little in vitro studies has been carried out on the fracture resistance of zirconia veneered posterior fixed dental prostheses. This study investigated the fracture resistance and the failure mode of 3-unit zirconia-based posterior fixed dental prostheses fabricated with two CAD/CAM systems. Material and Methods Twenty posterior fixed dental prostheses were studied. Samples were randomly divided into two groups (n=10 each) according to the zirconia ceramic analyzed: Lava and Procera. Specimens were loaded until fracture under static load. Data were analyzed using Wilcoxon´s rank sum test and Wilcoxon´s signed-rank test (P<0.05). Results Partial fracture of the veneering porcelain occurred in 100% of the samples. Within each group, significant differences were shown between the veneering and the framework fracture resistance (P=0.002). The failure occurred in the connector cervical area in 80% of the cases. Conclusions All fracture load values of the zirconia frameworks could be considered clinically acceptable. The connector area is the weak point of the restorations. Key words:Fixed dental prostheses, zirconium-dioxide, zirconia, fracture resistance, failure mode.
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Affiliation(s)
- Carlos López-Suárez
- DDS, Researcher, Department of Buccofacial Prostheses, Faculty of Odontology, University Complutense of Madrid, Spain
| | - Esther Gonzalo
- DDS, PhD, Associate Professor, Department of Buccofacial Prostheses, Faculty of Odontology, University Complutense of Madrid, Spain
| | - Jesús Peláez
- DDS, PhD, Associate Professor, Department of Buccofacial Prostheses, Faculty of Odontology, University Complutense of Madrid, Spain
| | - Verónica Rodríguez
- DDS, Researcher, Department of Buccofacial Prostheses, Faculty of Odontology, University Complutense of Madrid, Spain
| | - María-Jesús Suárez
- MD, DDS, PhD, Professor, Department of Buccofacial Prostheses, Faculty of Odontology, University Complutense of Madrid, Spain
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Renda JJ, Harding AB, Bailey CW, Guillory VL, Vandewalle KS. Microtensile Bond Strength of Lithium Disilicate to Zirconia with the CAD-on Technique. J Prosthodont 2015; 24:188-93. [DOI: 10.1111/jopr.12246] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 06/08/2014] [Indexed: 11/29/2022] Open
Affiliation(s)
- James J. Renda
- 10th Dental Squadron, US Air Force Academy; Colorado Springs CO
| | | | - Clifton W. Bailey
- Advanced Education in General Dentistry Residency Program; Dunn Dental Clinic; JBSA-Lackland TX
| | - Villa L. Guillory
- Advanced Education in General Dentistry Residency Program; Dunn Dental Clinic; JBSA-Lackland TX
| | - Kraig S. Vandewalle
- Advanced Education in General Dentistry Residency Program; Dunn Dental Clinic; JBSA-Lackland TX
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Lifetime comparison of Y-TZP/porcelain crowns under different loading conditions. J Dent 2015; 43:450-7. [DOI: 10.1016/j.jdent.2015.01.012] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/14/2014] [Revised: 01/13/2015] [Accepted: 01/20/2015] [Indexed: 11/21/2022] Open
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Ferrari M, Vichi A, Zarone F. Zirconia abutments and restorations: From laboratory to clinical investigations. Dent Mater 2015; 31:e63-76. [DOI: 10.1016/j.dental.2014.11.015] [Citation(s) in RCA: 45] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/05/2014] [Revised: 11/19/2014] [Accepted: 11/21/2014] [Indexed: 10/24/2022]
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Slow cooling protocol improves fatigue life of zirconia crowns. Dent Mater 2015; 31:77-87. [DOI: 10.1016/j.dental.2014.10.005] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/02/2013] [Revised: 12/22/2013] [Accepted: 10/27/2014] [Indexed: 11/18/2022]
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Ferrari M, Giovannetti A, Carrabba M, Bonadeo G, Rengo C, Monticelli F, Vichi A. Fracture resistance of three porcelain-layered CAD/CAM zirconia frame designs. Dent Mater 2014; 30:e163-8. [DOI: 10.1016/j.dental.2014.02.004] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/13/2013] [Accepted: 02/09/2014] [Indexed: 11/30/2022]
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Anami LC, Lima JMDC, Corazza PH, Yamamoto ETC, Bottino MA, Borges ALS. Finite element analysis of the influence of geometry and design of zirconia crowns on stress distribution. J Prosthodont 2014; 24:146-51. [PMID: 24975118 DOI: 10.1111/jopr.12175] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 12/13/2013] [Indexed: 11/29/2022] Open
Abstract
PURPOSE To evaluate the influence of the geometry and design of prosthetic crown preparations on stress distribution in compression tests, using finite element analysis (FEA). MATERIALS AND METHODS Six combinations of 3D drawings of all-ceramic crowns (yttria-stabilized zirconia framework and porcelain veneer) were evaluated: F, flat preparation and simplified crown; FC, flat preparation and crown with contact point; FCM, flat preparation and modified crown; A, anatomical preparation and simplified anatomical crown framework; AC, anatomical preparation and crown with contact point; and ACM, anatomical preparation and modified crown. Bonded contact types at all interfaces with the mesh were assigned, and the material properties used were according to the literature. A 200 N vertical load was applied at the center of each model. The maximum principal stresses were quantitatively and qualitatively analyzed. RESULTS The highest values of tensile stress were observed at the interface between the ceramics in the region under the load application for the simplified models (F and A). Reductions in stress values were observed for the model with the anatomical preparation and modified infrastructure (ACM). The stress distribution in the flat models was similar to that of their respective anatomical models. CONCLUSIONS The modified design of the zirconia coping reduces the stress concentration at the interface with the veneer ceramic, and the simplified preparation can exert a stress distribution similar to that of the anatomical preparation at and near the load point, when load is applied to the center of the crown.
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Affiliation(s)
- Lilian Costa Anami
- Department of Dental Materials and Prosthodontics, Institute of Science and Technology, UNESP - Univ Estadual Paulista, São José dos Campos, Brazil
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Sonza QN, Bona ÁD, Borba M. Effect of the infrastructure material on the failure behavior of prosthetic crowns. Dent Mater 2014; 30:578-85. [DOI: 10.1016/j.dental.2014.02.016] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/25/2013] [Revised: 12/03/2013] [Accepted: 02/20/2014] [Indexed: 02/04/2023]
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Trends in computer-aided manufacturing in prosthodontics: a review of the available streams. Int J Dent 2014; 2014:783948. [PMID: 24817888 PMCID: PMC4000974 DOI: 10.1155/2014/783948] [Citation(s) in RCA: 157] [Impact Index Per Article: 15.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/29/2013] [Accepted: 03/10/2014] [Indexed: 11/18/2022] Open
Abstract
In prosthodontics, conventional methods of fabrication of oral and facial prostheses have been considered the gold standard for many years. The development of computer-aided manufacturing and the medical application of this industrial technology have provided an alternative way of fabricating oral and facial prostheses. This narrative review aims to evaluate the different streams of computer-aided manufacturing in prosthodontics. To date, there are two streams: the subtractive and the additive approaches. The differences reside in the processing protocols, materials used, and their respective accuracy. In general, there is a tendency for the subtractive method to provide more homogeneous objects with acceptable accuracy that may be more suitable for the production of intraoral prostheses where high occlusal forces are anticipated. Additive manufacturing methods have the ability to produce large workpieces with significant surface variation and competitive accuracy. Such advantages make them ideal for the fabrication of facial prostheses.
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Kirsten A, Parkot D, Raith S, Fischer H. A cusp supporting framework design can decrease critical stresses in veneered molar crowns. Dent Mater 2014; 30:321-6. [DOI: 10.1016/j.dental.2013.12.004] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/25/2013] [Revised: 10/14/2013] [Accepted: 12/09/2013] [Indexed: 11/27/2022]
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Zhao K, Wei YR, Pan Y, Zhang XP, Swain MV, Guess PC. Influence of veneer and cyclic loading on failure behavior of lithium disilicate glass-ceramic molar crowns. Dent Mater 2014; 30:164-71. [DOI: 10.1016/j.dental.2013.11.001] [Citation(s) in RCA: 58] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/27/2013] [Revised: 08/05/2013] [Accepted: 11/11/2013] [Indexed: 11/25/2022]
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Agustín-Panadero R, Román-Rodríguez JL, Ferreiroa A, Solá-Ruíz MF, Fons-Font A. Zirconia in fixed prosthesis. A literature review. J Clin Exp Dent 2014; 6:e66-73. [PMID: 24596638 PMCID: PMC3935908 DOI: 10.4317/jced.51304] [Citation(s) in RCA: 43] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/17/2013] [Accepted: 11/21/2013] [Indexed: 02/04/2023] Open
Abstract
Statement of problem: Evidence is limited on the efficacy of zirconia-based fixed dental prostheses.
Objective: To carry out a literature review of the behavior of zirconium oxide dental restorations.
Material and Methods: This literature review searched the Pubmed, Scopus, Medline and Cochrane Library databases using key search words “zirconium oxide,” “zirconia,” “non-metal restorations,” “ceramic oxides,” “veneering ceramic,” “zirconia-based fixed dental prostheses”. Both in vivo and in vitro studies into zirconia-based prosthodontic restoration behavior were included.
Results: Clinical studies have revealed a high rate of fracture for porcelain-veneered zirconia-based restorations that varies between 6% and 15% over a 3- to 5-year period, while for ceramo-metallic restorations the fracture rate ranges between 4 and 10% over ten years. These results provoke uncertainty as to the long-term prognosis for this material in the oral medium. The cause of veneering porcelain fractures is unknown but hypothetically they could be associated with bond failure between the veneer material and the zirconia sub-structure.
Key words:Veneering ceramic, zirconia-based ceramic restoration, crown, zirconia, tooth-supported fixed prosthesis.
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Affiliation(s)
- Rubén Agustín-Panadero
- Associate Lecturer. Department of Dental Medicine, Faculty of Medicine and Dentistry, University of Valencia, Spain
| | - Juan L Román-Rodríguez
- Associate Lecturer. Department of Dental Medicine, Faculty of Medicine and Dentistry, University of Valencia, Spain
| | - Alberto Ferreiroa
- Collaborating Lecturer. Department of Buccofacial Prosthesis, Faculty of Odontology, Complutense University of Madrid
| | - María F Solá-Ruíz
- Assistant Lecturer. Department of Dental Medicine, Faculty of Medicine and Dentistry, University of Valencia, Spain
| | - Antonio Fons-Font
- Senior Lecturer. Department of Dental Medicine, Faculty of Medicine and Dentistry, University of Valencia, Spain
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Intraoral treatment of veneering porcelain chipping of fixed dental restorations: a review and clinical application. J Am Dent Assoc 2013; 144:31-44. [PMID: 23283924 DOI: 10.14219/jada.archive.2013.0011] [Citation(s) in RCA: 69] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
BACKGROUND Every dental ceramic system can experience failure of the veneering porcelain. However, the increasing popularity of all-ceramic crowns and fixed dental prostheses (FDPs) seems to have led to an increasing need to repair chipped veneering porcelain. OBJECTIVES The authors compared different methods to repair fractured ceramic restorations (porcelain-fused-to-metal and all-ceramic) and explain the basic principles of adhesion in these systems. They also evaluated the frequency and causes of failure in dental ceramic systems. METHODS This review is based on the results of PubMed and Google Scholar searches, as well as on a hand search of the scientific literature, resulting in 300 articles from 1977 to 2012. The authors used multiple key words (ceramic, repair, bonding, hydrofluoric acid, air abrasion, silane, phosphates, silicon dioxide) and different strategies (connecting different key words with OR, NOR and AND and truncation of the stem of words) to search the databases. RESULTS Because of differences in the material composition of ceramic systems (composed of metal, alumina or zirconia, glass-ceramics and feldspathic ceramics), different treatments are required for the exposed material surfaces after chipping. Use of hydrofluoric acid etching, air abrasion, tribochemical coating, silanization and metal primers or zirconia primers seem to be the most successful conditioning methods for durable bonding and repair. CONCLUSIONS AND CLINICAL IMPLICATIONS Intraoral repair of a restoration offers a satisfying option for the patient when the restoration cannot be removed or replaced. Its success depends largely on the conditioning methods used for the fractured surfaces.
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