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Teja Obulareddy V, Dixit A, Takhellambam V, Verma RK, Deepyanti, Kumar S, Kumar A. An In Vitro Investigation of the Role of Implant Abutment Materials on the Fracture Resistance and Failure Mode of Implant-Supported Restorations. Cureus 2024; 16:e54624. [PMID: 38529462 PMCID: PMC10962928 DOI: 10.7759/cureus.54624] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/27/2023] [Accepted: 02/14/2024] [Indexed: 03/27/2024] Open
Abstract
BACKGROUND Implant-supported restorations have gained popularity in modern dentistry, and the choice of abutment material is crucial for their long-term success. This in vitro study aimed to evaluate the fracture resistance and failure mode of implant-supported restorations using different abutment materials. METHODS Ninety standardized implant-supported restorations were included in the study. Abutments made of titanium, zirconia, and a hybrid material (titanium base with a zirconia veneer) were evaluated. Standardized abutments were fabricated, and screw-retained restorations were fabricated using a resin-based composite material. Cyclic loading was applied using a universal testing machine to simulate masticatory forces. Fracture resistance was measured in terms of the number of cycles to failure (NCF), and failure modes were analyzed. RESULTS The findings indicate that zirconia abutments exhibited higher fracture resistance compared to titanium and hybrid abutments. Longer implants demonstrated higher fracture resistance, suggesting improved stability and resistance to mechanical forces. Increased loading angles resulted in decreased fracture resistance of implant-supported restorations, emphasizing the need for proper occlusal adjustment. Central loading showed higher fracture resistance than lateral and posterior loading locations. The distribution of failure modes varied among the abutment materials, with bulk prosthesis fracture being the most common in the titanium group, while abutment fracture was predominant in the zirconia and hybrid groups. CONCLUSION This in vitro study demonstrated that the choice of abutment material significantly influenced the fracture resistance and failure mode of implant-supported restorations. Zirconia abutments exhibited the highest fracture resistance, followed by hybrid and titanium abutments. The failure mode analysis revealed different patterns of failure for each abutment material.
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Affiliation(s)
| | - Arti Dixit
- Public Health Dentistry, Vaidik Dental College and Research Centre, Daman, IND
| | | | - Rajnish K Verma
- Pedodontics and Preventive Dentistry, Kalinga Institute of Dental Sciences, Kalinga Institute of Industrial Technology (KIIT) (Deemed to be University), Bhubaneswar, IND
| | - Deepyanti
- Conservative Dentistry and Endodontics, D.Y. Patil Dental College and Hospital, Pune, IND
| | - Sandeep Kumar
- Public Health Dentistry, Rajendra Institute of Medical Sciences (RIMS), Ranchi, IND
| | - Amit Kumar
- Public Health Dentistry, Interdental Multispeciality Dental Clinic, Mumbai, IND
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Fujii Y, Hatori A, Minami S, Kanno Y, Hamada H, Miyazawa T, Chikazu D. Characteristics and Risk Factors for the Fracture of One-Piece Implants. J Maxillofac Oral Surg 2023; 22:1091-1098. [PMID: 38105858 PMCID: PMC10719176 DOI: 10.1007/s12663-023-02033-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/13/2023] [Accepted: 10/16/2023] [Indexed: 12/19/2023] Open
Abstract
Objective The one-piece dental implant was originally designed to overcome the structural weaknesses of the two-piece implant. However, a fractured one-piece implant requires removal because the abutment cannot be repaired or replaced to support new prosthetic restorations. The aim of this study was to clarify the features and risk factors for fracture of the one-piece implant. Methods This study was designed as a retrospective case series research. The subjects were patients who were treated for fractures of the one-piece implant at a clinic in Japan between 2012 and 2021. Fractures of the one-piece implant were diagnosed by cone-beam computed tomography, and the association between age and duration from implant placement to fracture was analyzed by one-way ANOVA followed by the Tukey test. Results Eighteen patients and 20 one-piece implants (under 39 years: 5 patients and 6 implants; 40-59 years: 7 patients and 7 implants; over 60 years: 6 patients and 7 implants) had fractures in their one-piece implants. Of the fractured implants, 11 had a diameter of 3 mm, and 9 had a diameter of 4 mm. The mean durations up to implant fracture were 662 days in the younger group, 1467 days in the middle group, and 1239 days in older group, and the duration was significantly shorter in the younger group. In addition, 83.3% of fracture implants in the younger group were in the molar region. All fractures of the one-piece implants occurred under the bone margin. Two patients had torus mandibularis, and 1 patient was had bruxism. Conclusions One-piece implants in younger patients that are located in the lower molar position are the most susceptible to implant fracture, and the fracture occurred under the bone margin in all cases.
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Affiliation(s)
- Yasuyuki Fujii
- Department of Oral and Maxillofacial Surgery, Tokyo Medical University, 6-7-1 Nishishinjuku, Shinjuku-Ku, Tokyo, Japan
- Tokyo Ekimae Dental Clinic, 3-3-11 Kyobashi, Chuo-Ku, Tokyo, Japan
| | - Ayano Hatori
- Department of Oral and Maxillofacial Surgery, Tokyo Medical University, 6-7-1 Nishishinjuku, Shinjuku-Ku, Tokyo, Japan
| | - Sakura Minami
- Department of Oral and Maxillofacial Surgery, Tokyo Medical University, 6-7-1 Nishishinjuku, Shinjuku-Ku, Tokyo, Japan
| | - Yuki Kanno
- Tokyo Ekimae Dental Clinic, 3-3-11 Kyobashi, Chuo-Ku, Tokyo, Japan
- Department of Oral and Maxillofacial Surgery, Tokyo Women’s Medical University, 8-1 Kawada-Cho, Shinjuku-Ku, Tokyo, Japan
| | - Hayato Hamada
- Department of Oral and Maxillofacial Surgery, Tokyo Medical University, 6-7-1 Nishishinjuku, Shinjuku-Ku, Tokyo, Japan
| | | | - Daichi Chikazu
- Department of Oral and Maxillofacial Surgery, Tokyo Medical University, 6-7-1 Nishishinjuku, Shinjuku-Ku, Tokyo, Japan
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Passanha DN, Sankeshwari B, Pattanshetti C, Dhole R, Miyyapuram S, Zawar Y. A Comparative Evaluation of Vertical Marginal Gap for Vented and Precemented Cad-Cam Zirconium Copings on Angulated Abutments: An In vitro Study. JOURNAL OF PHARMACY AND BIOALLIED SCIENCES 2023; 15:S934-S936. [PMID: 37693993 PMCID: PMC10485502 DOI: 10.4103/jpbs.jpbs_283_23] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/24/2023] [Revised: 03/27/2023] [Accepted: 03/28/2023] [Indexed: 09/12/2023] Open
Abstract
Objective To evaluate vertical marginal gap after cementation of Zr (zirconium) copings with palatal vent, open vent, and precementation technique on angulated abutments resulting from cement entrapment between intaglio surface of copings and angulated abutments. Materials and Methods Twenty-four angled abutments and 24 CAD-CAM Zr copings were assigned to three groups depending on the type of cementation technique, comprising eight copings with palatal vent, open vent, and no vent, respectively. Vertical marginal gaps between abutment shoulder and coping margin were evaluated at four points: buccal, palatal, mesial, and distal. The readings were statistically analyzed. Results The average mean value of vertical marginal gap at all sites for Group A with palatal vent was 158.45, for Group B with open vent was 151.84, and for Group C using precementation technique was 163.58. A statistically non-significant difference was seen for values between all sites (P > 0.05) for all groups. Conclusion The average vertical marginal gap for Group B was comparatively lower compared to Groups A and C.
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Affiliation(s)
- Divya N. Passanha
- Department of Prosthodontics Crown and Bridge, Bharati Vidyapeeth Dental College and Hospital, Sangli, Maharashtra, India
| | - Banashree Sankeshwari
- Department of Prosthodontics Crown and Bridge, Bharati Vidyapeeth Dental College and Hospital, Sangli, Maharashtra, India
| | - Channaveer Pattanshetti
- Department of Oral and Maxillofacial Surgery, Bharati Vidyapeeth Dental College and Hospital, Sangli, Maharashtra, India
| | - Rohit Dhole
- Department of Prosthodontics Crown and Bridge, Bharati Vidyapeeth Dental College and Hospital, Sangli, Maharashtra, India
| | - Sonica Miyyapuram
- Department of Prosthodontics Crown and Bridge, Bharati Vidyapeeth Dental College and Hospital, Sangli, Maharashtra, India
| | - Yash Zawar
- Department of Prosthodontics Crown and Bridge, Bharati Vidyapeeth Dental College and Hospital, Sangli, Maharashtra, India
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Bonyatpour M, Giti R, Erfanian B. Implant angulation and fracture resistance of one-piece screw-retained hybrid monolithic zirconia ceramic restorations. PLoS One 2023; 18:e0280816. [PMID: 36689439 PMCID: PMC9870147 DOI: 10.1371/journal.pone.0280816] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/09/2022] [Accepted: 01/09/2023] [Indexed: 01/24/2023] Open
Abstract
OBJECTIVE This study aimed to investigate the fracture resistance of one-piece screw-retained hybrid monolithic zirconia ceramic restorations in different implant angulations. MATERIALS AND METHODS Three implant fixtures were embedded in acrylic resin blocks with 0°, 15°, and 25° angulations. For each group of implant angulations, 11 screw-retained one-piece monolithic zirconia restorations were made and bonded to the titanium inserts with a dual-cure self-adhesive resin. The complexes were screwed to the implant fixtures with titanium screws. The samples were thermocycled, subjected to compressive load, and fracture modes were recorded. One-way ANOVA and post hoc Tukey's test were used for statistical analyses (α = 0.05). RESULTS One-way ANOVA showed the fracture resistance to be significanltly different among the study groups (P = 0.036). The 15° group was significantly more resistant than 0° (P = 0.031). However, the 25° group was not significantly different from the 15° (P = 0.203) and 0° groups (P = 0.624). Fractures occurred only on the restorations, not at the screw levels. CONCLUSIONS Tilting the implant up to 15° improves the fracture resistance of one-piece screw-retained hybrid monolithic zirconia restorations; however, increasing the tilt to 25° would not yield restorations with significantly better fracture strength than the straight implants. Accordingly, when angulated implants are indicated in the esthetic zones, one-piece screw-retained hybrid monolithic zirconia ceramic restorations can be used with acceptable fracture strength.
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Affiliation(s)
- Milad Bonyatpour
- Department of Prosthodontics, School of Dentistry, Shiraz University of Medical Sciences, Shiraz, Fars, Iran
| | - Rashin Giti
- Department of Prosthodontics, School of Dentistry, Shiraz University of Medical Sciences, Shiraz, Fars, Iran
| | - Behrad Erfanian
- Department of Prosthodontics, School of Dentistry, Shiraz University of Medical Sciences, Shiraz, Fars, Iran
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Yüksel M, Saygin AG, Bolayir G. Evaluation of The Fracture Resistance and Failure Types of Different CAD/CAM Ceramic Crowns Supported by Angled Titanium Abutment. J Prosthodont 2022. [PMID: 36065985 DOI: 10.1111/jopr.13596] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/28/2022] [Accepted: 08/14/2022] [Indexed: 11/28/2022] Open
Abstract
PURPOSE To evaluate the fatigue resistance of CAD-CAM single-ceramic crowns which were applied on angled implant abutments after thermomechanical aging. MATERIALS AND METHODS Titanium abutments (N = 72, MODE Medical Dental Implant, Turkey) with three different angles [0˚, 15°, 25°] were restored using different materials [Monolithic zirconia (Zir), lithium silicate ceramic reinforced by zirconia (VS), and Hybrid ceramic (VE)]. Crowns in the maxillary first premolar form were cemented to abutments using resin cement (Panavia 2.0 Introkit). Dynamic loading and thermomechanical aging were applied to the specimens (120,000 cycles, 49 N, 5°C to 55°C). Fracture resistance values were measured in the universal test machine and fracture types were determined. Two-way ANOVA and Tukey test were used for statistical analysis (Jamovi version 2.3.5). RESULTS Both the abutment angle and the type of material had a significant effect on fracture resistance (F = 3.295, p<0.05). The highest fracture resistance was obtained in the Group 0˚-Zir, and the lowest fracture resistance was obtained in the Group 15˚-VE. Fracture resistance showed significant differences between Group 0˚-Group15˚ for the Zir and VE materials, and between Group0˚-Group25˚ for VS (p<0.05), and no statistical significance was determined between the other groups (p>0.05). When failure types were evaluated they were seen to be full or partial crown fractures, and abutment deformation was found in some samples. CONCLUSION Monolithic crowns may be preferred on angled abutments. The fracture resistance of CAD-CAM materials decreases as the angle of abutments increases. Monolithic zirconia has higher fracture resistance than other materials. This article is protected by copyright. All rights reserved.
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Affiliation(s)
- Merve Yüksel
- Specialist of prosthodontics, Sivas Cumhuriyet University, Department of Prosthodontics, Sivas, Turkey
| | | | - Giray Bolayir
- Sivas Cumhuriyet University, Department of Prosthodontics, Sivas, Turkey
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Zincir ÖÖ, Parlar A. Comparison of stresses in monoblock tilted implants and conventional angled multiunit abutment-implant connection systems in the all-on-four procedure. BMC Oral Health 2021; 21:646. [PMID: 34915864 PMCID: PMC8680270 DOI: 10.1186/s12903-021-02023-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/12/2020] [Accepted: 12/13/2021] [Indexed: 11/10/2022] Open
Abstract
Background The All-on-four dental implant method is an implantology method designed to provide a comfortable prosthetic treatment option by avoiding advanced surgical procedures. This research aims to compare and evaluate the stress and tension values in conventional angled multiunit abutment-implant connection systems and monoblock dental implants used in the all-on-four procedure with finite element analysis. Methods Two master models were created by placing four implants connected to multiunit abutments (group A) in the interforaminal region of a completely edentulous mandible and four monoblock implants (group B) in the same region of another completely edentulous mandible. Group A implants were classified according to their diameter as follows: 3.5 mm (M1A), 4.0 mm (M2A), and 4.5 mm (M3A). Similarly, group B implants were classified as M1B, M2B, and M3B. In the six models rehabilitated with acrylic fixed prostheses, a 100 N force was applied to the anterior implant region, and a 250 N force was applied to the posterior cantilever in both axial and 30° oblique directions. Von Mises stresses were analyzed in the bone and implant regions of all models. Results M1A and M1B, M2A and M2B, and M3A and M3B were compared with each other under axial and oblique forces. The maximum Von Mises stresses in the bone around implants and the prosthesis screws, and the maximum and minimum principal stresses in the cortical and trabecular bone in group A models were significantly higher than those in group B models. Conclusions In monoblock implant systems under axial and oblique forces, higher stress is accumulated in the bone, prosthesis screw and implant compared to multiunit abutment-implant connection systems.
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Affiliation(s)
- Özge Özdal Zincir
- Department of Oral and Maxillofacial Surgery, Faculty of Dentistry, Istanbul Gelisim University, Istanbul, Turkey.
| | - Ateş Parlar
- Department of Periodontology, Private Primadent Oral, Dental Health and Implantology Center, Ankara, Turkey
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Saker S, Al-Zordk W, Özcan M. Resistance to Fracture of Zirconia Abutments with Different Angulations: Impact of Implant Platform Diameter. Eur J Dent 2020; 14:517-524. [PMID: 32645732 PMCID: PMC7535972 DOI: 10.1055/s-0040-1709947] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
Objective
The aim of this study was to assess the impact of implant platform diameters on ultimate force to failure of zirconia abutments with different angulation.
Materials and Methods
Forty-two zirconia abutments with either 0 degree (ST) or 15-degree (AN) angulation were assembled on tapered internal connection titanium implants (Direct's Legacy; 13 mm Implant Direct, LLC, Las Vegas, United States) with a platform diameter of Ø3.0, Ø3.5, and Ø4.5 mm (14 per group). Zirconia crowns (Ceramill Zolid; Amann Girrbach GmbH) were fabricated and cemented using self-adhesive resin cement (MaxCem Elite, Kerr). The specimens were thermomechanically loaded (TCML= 6,000 cycles of 5 to 50°C for 2 minutes/cycle followed by cyclic loading 600,000 cycles) followed by static loading until fracture. The data of load (N) at which fracture occurred were statistically analyzed by using Kruskal–Wallis analysis of variance and Mann–Whitney U tests at 5% significance level.
Results
Higher load to fracture was reported for zirconia crowns in straight abutments groups and a platform of 4.5, 3.5, and 3 mm diameter was 438.2± 85.4, 345.5± 71.3, and 331.1± 59.1 N, respectively. However, the groups restored with zirconia crowns in angulated abutments groups and a platform of 4.5, 3.5, or 3 mm diameter showed a fracture load of 411.4 ± 49.8, 354.2 ± 52.5, and 302.8 ± 52.5 N, respectively.
Conclusion
Straight and angulated zirconia abutments presented similar load to fracture on 3 and 3.5 mm platform diameters yet being significantly less for 4.5 mm diameter.
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Affiliation(s)
- Samah Saker
- Fixed Prosthodontics Department, Faculty of Dentistry, Mansoura University, Mansoura, Egypt
| | - Walid Al-Zordk
- Fixed Prosthodontics Department, Faculty of Dentistry, Mansoura University, Mansoura, Egypt
| | - Mutlu Özcan
- University of Zurich, Center of Dental Medicine, Division of Dental Biomaterials, Clinic for Reconstructive Dentistry, Zurich, Switzerland
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Naveau A, Rignon-Bret C, Wulfman C. Zirconia abutments in the anterior region: A systematic review of mechanical and esthetic outcomes. J Prosthet Dent 2019; 121:775-781.e1. [PMID: 30617036 DOI: 10.1016/j.prosdent.2018.08.005] [Citation(s) in RCA: 53] [Impact Index Per Article: 10.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/22/2018] [Revised: 08/07/2018] [Accepted: 08/08/2018] [Indexed: 02/07/2023]
Abstract
STATEMENT OF PROBLEM The success of single, anterior, implant-supported restorations relies on mechanical and esthetic outcomes. Titanium has been the most commonly used material for abutments, but zirconia is increasingly chosen for its appearance despite its unclear mechanical performance. Today, manufacturers market prefabricated, computer-aided design and computer-aided manufacturing (CAD-CAM) custom and zirconia abutments with titanium connections. PURPOSE The purpose of this study was to systematically review the mechanical and esthetic outcomes of implant zirconia abutments used in the anterior region, considering the design changes of the past 5 years. MATERIAL AND METHODS An electronic search was conducted in Medline (PubMed) for studies on zirconia abutments. All clinical studies with at least a 1-year follow-up and case series (>5 abutments) published after 2013 were included. Mechanical and esthetic outcomes were collected. RESULTS Of the 231 retrieved studies, 20 remained for quantitative analysis. Twelve described mechanical outcomes, and 15 focused on esthetics, using mainly the pink esthetic score. Five articles reported abutment fractures and no chipping. No difference was found between prefabricated and custom abutments or internal and external implant connections regarding fractures or screw loosening. All authors reported "good to excellent" esthetic integration in terms of restorations and soft-tissue color and the presence and height of papillae. The most difficult esthetic parameters to achieve were root convexity, soft-tissue color, and texture and level of mucosa. CONCLUSIONS Esthetics remain the major advantage of zirconia abutment when compared with titanium, despite reservations concerning the risk of mechanical complications. Data are lacking for zirconia abutments with titanium inserts, although the prospects for this design are promising.
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Affiliation(s)
- Adrien Naveau
- Associate Professor, Prosthodontics Department, University of Bordeaux, Bordeaux, France; Saint Andre Hospital, Bordeaux University Hospital, Bordeaux, France
| | - Christophe Rignon-Bret
- Associate Professor, Prosthodontics Department, Paris Descartes University - Sorbonne Paris Cité, Paris, France; Dental Department, Henri Mondor Hospital-University Group, AP-HP (Public Assistance-Paris hospital), Creteil, France
| | - Claudine Wulfman
- Associate Professor, Prosthodontics Department, Paris Descartes University - Sorbonne Paris Cité, Paris, France; Dental Department, Henri Mondor Hospital-University Group, AP-HP (Public Assistance-Paris Hospital), Creteil, France.
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Malhotra AO, Padmanabhan TV, Mohamed K, Natarajan S, Elavia U. Load transfer in tilted implants with varying cantilever lengths in an all-on-four situation. Aust Dent J 2012. [DOI: 10.1111/adj.12002] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Mitsias M, Koutayas SO, Wolfart S, Kern M. Influence of zirconia abutment preparation on the fracture strength of single implant lithium disilicate crowns after chewing simulation. Clin Oral Implants Res 2012; 25:675-82. [PMID: 23106096 DOI: 10.1111/clr.12058] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 09/08/2012] [Indexed: 11/28/2022]
Abstract
OBJECTIVE The use of all-ceramic crowns over zirconia abutments is a well-established esthetic treatment option in implant dentistry; however, the effect of the mechanical processing due to abutment preparation has not been investigated under functional loading. The purpose of the study was to evaluate the influence of the zirconia abutment preparation depth and preparation mode on the fracture strength and fracture mode of lithium disilicate crowns after chewing simulation. MATERIAL AND METHODS Seventy single implant-supported lithium disilicate glass-ceramic crowns (IPS e.max Press, Ivoclar Vivadent) were adhesively cemented (Multilink Automix, Ivoclar Vivadent) onto zirconia abutments (ZirDesign, Astra Tech) using implants with a diameter of 4.5 mm and a length of 15.0 mm (Osseospeed, Astra Tech). Study design concerned the replacement of a maxillary central incisor (11.0 mm in height and 8.0 mm in width). Subgroups (n = 7) were subjected to dynamic loading (C) up to 1.2 × 10(6) loading cycles at 135° with 98N in a thermomechanical chewing simulator (Kausimulator, Willytech); followed by quasi-static loading at a cross-head speed of 0.5 mm/min until fracture in a universal testing machine (Z010/TN2S, Zwick). Additional subgroups were also subjected to quasi-static loading (S) at 135°. Lithium disilicate implant crowns were divided into five study groups (n = 14) according to the abutment preparation depth [A (control): 0.5 mm, B: 0.7 mm, C: 0.9 mm, and preparation mode [(No label): milling by the manufacturer, (P): copy-milling by the Celay System (Mikrona)]. RESULTS All specimens survived dynamic loading and mean fracture strengths (N) after quasi-static loading were as follows: Group SA: 384 ± 84; Group CA: 403 ± 67; Group SB: 294 ± 95; Group CB: 374 ± 75; Group SC: 332 ± 52; Group CC: 373 ± 105; Group SPB: 332 ± 80; Group CPB: 499 ± 91; Group SPC: 380 ± 101; and Group CPC: 358 ± 54. CONCLUSIONS Statistical analysis using multiple linear regression showed that both the preparation depth and mode had no influence on the fracture strength of the implant crowns (P > 0.05); however, fracture strength increased statistically significantly after 5 years chewing simulation (P = 0.01).
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Affiliation(s)
- Miltiadis Mitsias
- Department of Prosthodontics, Propaedeutics and Dental Materials, School of Dentistry Christian-Albrechts University at Kiel, Kiel, Germany; Private Practice, Athens, Greece
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Ellakwa A, Martin FE, Klineberg I. Influence of Implant Abutment Angulations and Two Types of Fibers on the Fracture Resistance of Ceramage Single Crowns. J Prosthodont 2012; 21:378-84. [DOI: 10.1111/j.1532-849x.2012.00859.x] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022] Open
Affiliation(s)
- Ayman Ellakwa
- Faculty of Dentistry, the University of Sydney, Sydney, Australia.
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Danappanavar PM, Nanda Z, Bhaskar M, Gowd V, Molugu M, Reddy KA, Reddy RK, Kumar MA. Comparative evaluation of resistance failure in nonprecious metal-ceramic restoration at the incisal edge with varying thickness under different application of load: an in vitro study. J Contemp Dent Pract 2011; 12:434-40. [PMID: 22269233 DOI: 10.5005/jp-journals-10024-1072] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
OBJECTIVE To determine the resistance failure value of nonprecious metal-ceramic restorations at the incisal edge with varying thickness under different application of load. MATERIALS AND METHODS An Ivorian central incisor was prepared to receive metal-ceramic crown, which was further duplicated, invested, casted and 72 metal dies were fabricated in Co-Cr alloy. Metal dies were relieved with die spacer, lubricated and wax patterns were prepared for metal copings, which were further invested and casted and 72 metal copings were fabricated. The ceramic materials were used for the study viz. Vita/VMK, IPSd SIGN, and superporcelain. Ceramic built-up was carried out according to manufacturer instructions. Incisal ceramic built-up was carried out with increasing thickness from 2.00 to 2.5 and 3.00 mm. RESULTS A total of 72 samples, prepared for the study, were divided into two groups, i.e. group I (36 samples) and group II (36 samples), as per the direction of application of load. The samples were mounted on acrylic block (6 samples/block). A total 12 acrylic blocks were prepared. All the samples were tested using universal testing machine (MTS/USA). The load was applied with crosshead speed of 5 mm/min. CONCLUSION Fracture resistance was found to be highest for the 2.00 mm and lowest for 3.00 mm incisal ceramic thickness samples regardless of the ceramic material in both groups. There was a gradual decrease in fracture resistance as the incisal ceramic thickness increased from 2.00 to 3.00 mm in all samples. Fracture resistance was marginally higher for incisal ceramic build-up of 3 mm thickness on group II metal copings than on group I copings. Fracture resistance was highest for IPSd SIGN followed by that of Vita/VMK-95 and superporcelain. CLINICAL SIGNIFICANCE A 3.00 mm incisal ceramic thickness offered greater fracture resistance in comparison to lower values of incisal thickness; IPSd SIGN offered greatest fracture resistance followed by that of Vita/VMK-95 and superporcelain.
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Affiliation(s)
- Prasanna M Danappanavar
- Department of Oral Pathology, MNR Dental College and Hospital, Sangareddy, Andhra Pradesh, India
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