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Download or read book Displacement Comparison of CAD–CAM Titanium and Zirconia Abutments to Implants with Different Conical Connections written by and published by . This book was released on 2018 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Yoon-Hyuk Huh
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (116 download)
Download or read book Axial Displacements of Cemented Prosthesis in Different Implant-abutment Connections written by Yoon-Hyuk Huh and published by . This book was released on 2017 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Background: Axial displacement is a unique biomechanical feature of internal conical connection (ICC) implants. ICC abutments lacking structures for vertical stop might sink axially into the inner surface of the implant. Axial displacement is caused by factors u2014 machining tolerance and the settling and wedge effects. Machining tolerance and the settling effect are inevitable phenomena in both external and ICC implants. However, the wedge effect, which induces concentrated axial compressive force in the direction of abutment sinking, is observed only in ICC implants. Although axial displacement in screw-type prostheses has been reported previously, no information is available regarding axial displacement in cement-retained prostheses. Differences in implantu2013abutment connection type have been known to result in variations in axial displacement in various clinical situations. Three typical implantu2013abutment connectionsu2014the external-butt (EXT), internal-conical (INT), and internal-butt (INT-Butt) connectionsu2014have been known to provide satisfactory results in clinical practice.Aim/Hypothesis:The purpose of this study was to quantitatively evaluate axial displacement in three different implantu2013abutment connections in cement-retained monolithic zirconia and polymethylmethacrylate (PMMA) provisional prostheses with the computer aided designu2013computer aided manufacturing (CAD-CAM) custom abutments.Materials and Methods: Three types of implants with different connectionsu2014external and internal butt connection implants and an internal conical connection implantu2014were evaluated. In each implant group, implant replicas were embedded vertically and angulated at 15u00b0. Sixty titanium custom abutments were fabricated using a CAD-CAM system. The geometries and surface morphologies of custom and ready-madeabutments were comparatively evaluated by scanning electron microscopy. Micro-gaps in abutment connections were scanned byoptical microscopy during screw tightening, re-tightening, and cyclic loading. Zirconia and provisional acrylic prostheses were fabricated and evaluated for internal gap by an indirect silicone technique. Cemented prostheses on abutments were mounted on a universal testing machine and subjected to 250 N sine wave cyclic loads. Cumulative axial displacement was measured at loadingperiods of 3, 10, 100, and 1,000,000 and analyzed by repeated measures analysis of variance (ANOVA). Internal gap width and netchange in axial displacement were analyzed by multi-way ANOVA.Results: There were no significant differences in internal gap widths of prostheses according to implant or prosthesis type. However,measurement site and implant angulation were influencing factors on internal gap. Surface geometries and morphologies of custom abutments varied according to the implantu2013abutment connection. Machining tolerance control and precision fit were difficult to achieve with the custom CAD-CAM abutment. The internal and external conical connection implants exhibited the greatest and lowest axial displacements, respectively. Acrylic prostheses exhibited greater axial displacement than zirconia prostheses. The vertically positioned implant group exhibited greater axial displacement than the angulated implant group in the early cyclic loading periods. Axial displacement in the late cyclic loading period was relatively low.Conclusions and Clinical implications:Custom abutments for cement-retained prostheses exhibited greater axial displacement than screw-retained prostheses. Axial displacement mostly occurred in the early loading period and was self-limited. Axial displacement should be managed by provisional restoration, with consideration of implant connection type and angulation, abutment fabrication method, and occlusal force of the patient.
Author : Jamie Foong
Publisher : LAP Lambert Academic Publishing
ISBN 13 : 9783659617287
Total Pages : 120 pages
Book Rating : 4.6/5 (172 download)
Download or read book Fracture Resistance of Titanium and Zirconia Abutments - A Lab Study written by Jamie Foong and published by LAP Lambert Academic Publishing. This book was released on 2014-10-21 with total page 120 pages. Available in PDF, EPUB and Kindle. Book excerpt: Statement of Problem. There is little conclusive evidence comparing the fracture resistance of internal connection titanium and zirconia implant abutments and the purpose of this study was to determine the fracture resistance of internal connection titanium and zirconia implant abutments. Material and Methods. Twenty-two specimens simulating implant-supported anterior single crowns were randomly divided into two equal test groups. Abutments were attached to dental implants mounted in acrylic resin and CAD/CAM crowns constructed. Chewing function was simulated using cyclic loading in a stepped fatigue loading protocol until failure. Failed specimens were then analyzed using SEM and fractographic analysis. Results. The titanium abutment group fractured at a mean SD load of 270 56.7 N and a mean SD of 81,935 27,929 cycles. The zirconia abutment group fractured at a mean SD load of 140 24.6 N and a mean SD of 26,296 9,200 cycles (p
Author : Hamid R. Shafie
Publisher : John Wiley & Sons
ISBN 13 : 1118928539
Total Pages : 200 pages
Book Rating : 4.1/5 (189 download)
Download or read book Clinical and Laboratory Manual of Dental Implant Abutments written by Hamid R. Shafie and published by John Wiley & Sons. This book was released on 2014-07-09 with total page 200 pages. Available in PDF, EPUB and Kindle. Book excerpt: To fulfill the vision for his latest book, Dr. Hamid Shafie compiled technical information from a vast variety of sources, including implant manufacturers and designers, master dental technicians, implant researchers, and expert clinicians leading the field of implant dentistry worldwide. He and his expert contributors meticulously assembled each chapter to include only the most relevant and up-to-date content and procedures in a concise and simple format. Dr. Shafie follows the same easy-to-read, easy-to-understand format as his best-selling textbook Clinical and Laboratory Manual of Implant Overdentures.Starting with the material science behind implant abutments, the text then describes all of the relevant abutment solutions, providing a step-by-step guide to design and manufacturing of the CAD/CAM abutments and explaining how to adjust prefabricated abutments and one-piece titanium and zirconia implants. In addition to offering the ultimate procedural guide for clinical and laboratory preparation of dental implant abutments, this textbook is filled with useful tips on clinical practice management such as sterilization, instrumentation and trouble-shooting related to implant abutments. Clinical and Laboratory Manual of Dental Implant Abutmentsis the only text devoted exclusively to an in-depth look at implant abutments. Every dental implant clinician, technician, student, and implant industry insider needs this vital work in their library.
Author : Abdul Aziz Al-Sahhaf
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (971 download)
Download or read book Long-term Stability and Resistance to Fracture written by Abdul Aziz Al-Sahhaf and published by . This book was released on 2016 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Zusammenfassung: AbstractObjectiveTo investigate the survival rate, fracture strength, bending moments, loading to fracture and fracture modes of different designs of zirconia abutments after dynamic loading with thermocycling, and compare these values to titanium abutments.MethodsA total of 80 abutment samples were divided into 5 test groups of 16 samples in each group. The study included the following groups, Group 1: CAD/CAM produced all-zirconia abutments, Group 2: titanium abutments, Group 3 zirconia-abutments adhesively luted to a titanium base, Group 4: prefabricated all-zirconia abutments and Group 5: zirconia-abutments glass soldered to a titanium base. Half the number of samples in each group was exposed to 1.2 million loading cycles (5-years simulation) in the chewing simulator. The samples that survived the artificial aging were later tested for fracture strength in a universal testing machine. The remaining 8 samples of the group were directly tested for fracture strength.ResultsAll samples exposed to the 5-years artificial aging survived except of six samples in one group (Group 1). The surviving samples were later fracture tested in the universal testing machine. The bending moments (Ncm) values were as follow: Exposed groups: Group 1: 94.5 Ncm; Group 2: 599.2 Ncm; Group 3: 477.5 Ncm; Group 4: 314.4 Ncm; Group 5: 509.4 Ncm. Non-exposed groups: Group 1: 269.3 Ncm; Group 2: 474.2 Ncm; Group 3: 377.6 Ncm; Group 4: 265.4 Ncm; Group 5: 372.4 Ncm. Except in Group 1, the values were higher in the exposed groups, although, statistically there was no difference (p>0.05). The one-piece ZrO2-abutment group (Group 1 and Group 4) exhibited lower values, while the two-piece ZrO2-abutment groups (Group 3 and Group 5) showed similar values and fracture modes like the titanium abutment group. The titanium abutment group showed the highest values of bending moments among all groups.ConclusionThe implant-abutment connection area appeared to influence the bending moment value and the fracture mode of the tested abutment groups, and it was found to be the weakest part of an internal connection one-piece zirconia abutment. The titanium base in the two-piece zirconia abutment worked as a substitute for the weakest part of the abutment. Therefore, the titanium base can reinforce the fracture strength of a zirconia abutment
Author : Pitta Joao
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (116 download)
Download or read book Stability of Zirconia Mesio-abutments Bonded to Titanium Bases Restored with Monolithic Crowns written by Pitta Joao and published by . This book was released on 2017 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Background: Recently due to esthetic concerns, zirconia abutments are becoming very popular. However, they were shown to be much moreprone to fracture than titanium abutments. The development of the titanium bonding-bases allowed a combination of a metallicconnection to the implant with different all-ceramic suprastructures, including monolithic reconstructions. Yet, it is still not clear howstable these reconstructions are.Aim: To assess the bending moments and fracture patterns of zirconia mesio-abutments on titanium bonding-bases restored with differentall-ceramic monolithic crowns and compare them with titanium abutments restored with all-ceramic crowns.Materials and Methods: 48 implants with an internal connection (Conelog, Camlog) were restored with 4 different CAD-CAM abutment-crown combinations(n=12). 36 customized zirconia mesio-abutments were bonded to titanium bonding-bases and divided into 3 groups according to thedifferent crown material: (T1) monolithic lithium disilicate (e-max CAD, Ivoclar); (T2) monolithic zirconia (Lava Plus, 3M ESPE) and(T3) monolithic hybrid ceramic (Enamic, Vita) Titanium customized abutments restored with monolithic lithium disilicate (e-max cad,Ivoclar) crowns served as control group (C). All crowns were cemented using a resin-cement (Panavia 21, Kuraray). The sampleswere embedded in acrylic holders. After aging (1'200'000 cycles, 49 N, 1.67 Hz, 5u00b0C-50C, 120s), static load was applied until failure(ISO-Norm 14801). Bending moments were calculated for comparison of the groups. Values were statistically compared with one-wayANOVA followed by Tukey post hoc test (p.05). Failure mode was analyzed descriptively.Results: The means of the bending moments were 356.4 u00b1 20.8 Ncm (T1), 385.5 u00b1 21.2 Ncm (T2), 357.7 u00b1 26.3 Ncm (T3) and 358.8 u00b1 25.3Ncm (C). Group T2 exhibited significantly higher mean bending moments than the other groups (p 0.05). No differences were foundbetween zirconia mesio-abutments on titanium bonding-base abutments and customized titanium abutments (p > 0.05). No failureswere registered during the aging. In all the groups failures occurred due to fracture of the abutment in the internal connection.Conclusions and clinical implications: The use of zirconia mesio-abutments bonded to titanium bonding-bases appeared to be a stable combination when compared to thecustomized titanium abutments which still represent the gold-standard. Regarding the crown material, monolithic zirconia revealed tobe mechanically superior than the other crown materials.
Author : Mohamed Ibrahim Abdelhamed
Publisher :
ISBN 13 :
Total Pages : 48 pages
Book Rating : 4.:/5 (672 download)
Download or read book A Comparison of Zirconia and Titanium Abutments for Microleakage written by Mohamed Ibrahim Abdelhamed and published by . This book was released on 2010 with total page 48 pages. Available in PDF, EPUB and Kindle. Book excerpt: Abstract: Background: The existence of a microgap in two-piece implant system has been well documented in the literature. This microgap is in microns size and several in-vitro studies tested the microleakage through the microgap and its effect on hard and soft tissues. It was proven that this gap acts as a reservoir for bacteria which induced peri-implant tissue inflammatory reactions. Microleakage through the interface differ between implant body-abutment connections systems and study methodology. There is an increased demand for all ceramic crowns and zirconia abutments in the anterior sextant due to esthetic reasons. To our knowledge there is not enough information regarding leakage around zirconia abutments. Thus it was the purpose of the study to compare titanium abutments and zirconia abutments for microleakage under two different torque values.
Author : Zinaida Kaleinikova
Publisher :
ISBN 13 :
Total Pages : 64 pages
Book Rating : 4.:/5 (838 download)
Download or read book The Effect of Implant Angulation on the Fracture Resistance of Procera Zirconium Abutments written by Zinaida Kaleinikova and published by . This book was released on 2006 with total page 64 pages. Available in PDF, EPUB and Kindle. Book excerpt: Abstract: Introduction: An all-ceramic abutment system offers superior esthetics, translucency, biocompatibility and strength in comparison to metal abutments. Naturally, with all the variables presented by human beings, there is a risk that the final location and angulation of the implant would be not as exact as planned. The restorative dentist has an option to use prefabricated ceramic abutments and customize them as necessary to achieve highly esthetic results. However, there is not much information on how different abutment angulations affect strength. The new Procera system (Nobel Biocare) offers customized abutments in wide variety of clinical situations, which would be especially convenient in the restorative esthetic cases of angled implants. Purpose: This study examined the effects of implant angulation on the strength of ceramic abutment designs. Materials and methods: Twenty custom made Procera (Nobel Biocare) zirconia abutments fabricated with CAD/CAM technique were used in this study. The typical design of an abutment for a cemented central incisor crown was used. The strength of zirconium abutments was measured using four different axial alignments of implants: Group A, axis of implant goes through the cingulum area, Group B, through the incisal edge, Group C, 150 labial inclination and Group D, the anterior angled limit allowed by the abutment screw height (300). Using an MTS hydraulic machine, load was applied to a consistent palatal/incisal reference point on each abutment. Measurements of fracture load were collected and analyzed using ANOVA. Where ANOVA detected a difference between tested variable levels, REGWQ test was performed and determined which variable level was more significant. Results: Group A withstand significantly (p=0.005) higher fracture load than Group B, Group C and Group D. Mean peak load values were 518.7 N, 269.4 N, 232.0 N and 227.4 N, respectively. Conclusion: Comparison of fracture load measurements of different abutment angulations revealed the most fracture resistant abutment design. Results from this study will help to create guidelines for prosthodontists in making decisions in various clinical situations and improve pre-operative treatment planning, particularly as they relate to the Procera (Nobel Biocare) all-ceramic system.
Author : Nicholas Ross Jacobs
Publisher :
ISBN 13 :
Total Pages : 39 pages
Book Rating : 4.:/5 (122 download)
Download or read book Displacement of Screw-retained Single Crowns Into New Generation Narrow Diameter Implants with Conical and Conical/hex Internal Connections and Their Performance when Cyclically Loaded written by Nicholas Ross Jacobs and published by . This book was released on 2019 with total page 39 pages. Available in PDF, EPUB and Kindle. Book excerpt: Purpose: To measured 3D axial displacement of screw-retained single abutments with conical (AST) and conical/hex (ZIM) internal connections into narrow diameter implants (NDI). Additionally, measured torque values before and after cyclic loading were used to calculate "preload efficiency."
Download or read book Influence of Margin Location and Luting Material on the Amount of Undetected Cement Excess on CAD CAM Implant Abutments and Cement-retained Zirconia Crowns written by and published by . This book was released on 2017 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Aim: The aim of the study is to assess the frequency of cement residues after cementation of monolithic zirconia crowns on CAD/CAM custom molar titanium abutments.Material & Methods: A master cast with embedded implant analog (SEMADOS, BEGO, Bremen, Germany) and flexible soft tissue silicone mask was used. Twenty CAD/CAM titanium abutments with different positions of the margin u2013 from 0 mm supragingivally to 3 mm below the gingival level u2013 were centrally milled and divided equally into four groups. The same amount of zirconia crowns was luted to the CAD/CAM abutments, excess cement was cleaned and the restorations were removed for evaluation of the undetected cement remnants. The screw access of the abutments and the opening on the occlusal surface of the crowns were covered during in-vitro cementation (Temp Bond NE, Kerr Dental, Germany and Panavia V5, Kuraray, Japan ). All quadrants of each specimen were evaluated for calculation of the ratio between the cement remnants area and the total specimen area using Adobe Photoshop.Statistics: A statistical analysis was carried out using STATISTICA (STATSOFT, Tulsa, USA, version 9.1) and BiAS (Epsilon-Verlag, Frankfurt, version 11.02). Significance was set at p
Author : Sary Borzangy
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (914 download)
Download or read book A Comparison of Zirconia CAD/CAM to Conventionally Fabricated Single Implant Restorations in the Esthetic Zone written by Sary Borzangy and published by . This book was released on 2015 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Conclusion: After one year of clinical performance, the Zr group showed comparable results to the Ti group. This indicated that good clinical, biological and esthetic outcomes could be achieved by either treatment option. Further observations and follow-up are required to evaluate long-term results.
Author : Ivica Pelivan
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (116 download)
Download or read book PERIODONTAL EVALUATION OF STOCK AND CUSTOM CAD CAM IMPLANT ABUTMENTS- 1-year Follow-up Study written by Ivica Pelivan and published by . This book was released on 2017 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: BackgroundImplant abutment selection is the crucial moment in implant prosthodontics treatment. Abutments can generally be divided into two main groups: stock and custom. For several years, stock abutments have been the only option available for clinicians.Custom made CAD/CAM abutment acts as adequate support for soft tissues, and the connection between abutment and a cement-retained crown is moved more towards coronal, which makes residual cement removal easier during cementation of a prosthetic restoration.Aim/HypothesisThe aim of this study was to compare stock and individual CAD/CAM abutments after one year in function. A total of 64 subjects with one missing tooth, were included in this study. The missing tooth was replaced with a dental implant, an abutment and a porcelain-fused-to-metal crown.Materials and MethodsA total of 64 subjects had a single tooth loss restored by dental implant and porcelain-fused-to-metal crowns were fabricated. In one group there were a total of 34 stock Ti abutments and in the second group of subjects 30 CAD/CAM made Ti abutments. Examination of soft tissues around dental implants included determination of modified plaque index (mPI) and modified bleeding index (mBI), as well as measurement of sulcus probing depth (PPD). The average modified plaque index (mAPI) was calculated from the measured values, as the average measurement value on all four crown surfaces. The average modified bleeding index (mABI) was calculated in the same way. PPD measurement was performed on the mesial, distal, vestibular and lingual crown surface, and the average values of measured probing depth (APPD) were calculated. The values mAPI, mABI and APPD were measured during the first check-up (a week after cementing the crown) and at check-ups after four, eight and twelve months.ResultsAverage plaque index values (API), initial and after four, eight and twelve months, have not indicated significant differences between two groups of subjects. Average bleeding index values - initial (i-ABI) and after four months (4m-ABI) revealed no significant differences between two tested groups. However, there was significant difference in the average bleeding index values after eight months (8m-ABI) between the two tested groups (Mann Whitney's U test p=0.002). Significant difference (Mann Whitney's U test p
Author : Ghada O. Alrabeah
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (11 download)
Download or read book The Effect of Different Implant-abutment Connection Geometry and Abutment Alloy on Corrosion Product Release and Cell Response written by Ghada O. Alrabeah and published by . This book was released on 2019 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :
Publisher :
ISBN 13 :
Total Pages : 80 pages
Book Rating : 4.3/5 (91 download)
Download or read book The Glossary of Prosthodontic Terms written by and published by . This book was released on 1994 with total page 80 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Hanna Volkmann
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (131 download)
Download or read book Pull-off Force of Four Different Implant Cements Between Zirconia Crowns and Titanium Implant Abutments in Two Different Abutment Heights written by Hanna Volkmann and published by . This book was released on 2022 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Andy Ben Gilbert
Publisher :
ISBN 13 :
Total Pages : 44 pages
Book Rating : 4.:/5 (869 download)
Download or read book Three Dimensional Displacement of Nine Different Abutments for Cement-retained Crowns Using a Specific Torqueing Protocol on a Tapered Screw-vent Implant written by Andy Ben Gilbert and published by . This book was released on 2013 with total page 44 pages. Available in PDF, EPUB and Kindle. Book excerpt: Results: After the initial 30 Ncm torque was applied, the Atlantis Titanium, the Inclusive Custom Titanium, and the Legacy Zirconia Straight Contoured abutments showed statistically significant higher mean displacements than other abutments in the horizontal direction (P
Author : Hadi AL-Meraikhi
Publisher :
ISBN 13 :
Total Pages : 58 pages
Book Rating : 4.:/5 (945 download)
Download or read book In Vitro Fit and Distortion of CAD/CAM-fabricated Implant-fixed Titanium and Zirconia Complete Dental Prostheses Frameworks written by Hadi AL-Meraikhi and published by . This book was released on 2015 with total page 58 pages. Available in PDF, EPUB and Kindle. Book excerpt: Results: Results showed that the material type (zirconia or titanium) was not significant for 3D gap measurements (p=.9038). However, 3D gap measurement values were significantly different between Gap 3 and 4 within each group (P=.0003). The mean 3D gap measurement for Gap 2 for titanium was 48.2 μm (SD 2.6). The mean 3D gap measurement for Gap 3 for titanium was 74.0 μm (SD 15.0) and 84.4 μm (SD 12) for zirconia. The mean 3D gap measurement for Gap 4 for titanium was 102 μm (SD 26.7) and 93.8 μm (SD 30) for zirconia. All 3D gap measurements showed values
