Wear at the Implant-Abutment Interface of Zirconia Abutments Manufactured by Three CAD/CAM Systems (original) (raw)
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Wear of the Implant Connection with Zirconia and Titanium Abutments
Open Access Journal of Dental Sciences, 2017
Background: Classify and quantify the wear of the implant and abutment interface simulating a loose screw situation. Methods: Nine external connection titanium implants were split into 4 groups: Group A (no hexagon titanium abutment), Group B Titanium abutment (with hexagon) (n=3), Group C Zirconia abutment with hexagon (n=3) and Group D mix abutments (n=2). All components were individually weighted and the rotational freedom for each pair was access before and after testing. The specimens were tested an Instron 8874 fitted with a dynamic load cell with a torque capacity of 100Nm and a precision of 0.5% from 1% of the full scale. They were loaded with a sinusoidal rotational angle that was different for each group (A= 6º, B= 3.3º, C= 0.835º, D=6.6 º), 4 Hz, for 250.000 cycles. After testing all components were photographed with a SEM. Spearman's correlation analysis was made. Results: Regardless of angle and materials the rotational freedom increased in all groups. Volume loss with zirconia abutment was more than double than with a titanium abutment. Conclusion: The loose screw in implant prosthesis may lead to the wear of the hexagon on both components. This wear is sufficient to compromise the connection beyond repair.
Correlation of wear in vivo and six laboratory wear methods.
d e n t a l m a t e r i a l s 2 8 ( 2 0 1 2 ) 961-973 Laboratory test method Correlation Composite Clinical a b s t r a c t Objective. We examined the correlation between clinical wear rates of restorative materials and enamel (TRAC Research Foundation, Provo, USA) and the results of six laboratory test methods (ACTA, Alabama (generalized, localized), Ivoclar (vertical, volumetric), Munich, OHSU (abrasion, attrition), Zurich).
Journal of Oral Rehabilitation, 2008
Better clarification of the long-term relationship among the various implant-related measures could improve the evaluation process for dental implants. Thus, the aim of the present study was to determine the potential correlations among the volumetric features and nitric oxide content of peri-implant sulcus fluid (PISF) and measures of implant stability, and the marginal bone loss. Completely edentulous patients (n = 15) treated with dental implants and ball attachment mandibular over dentures were included. Resonance frequency analysis (RFA), marginal bone level measurements, PISF volume and spectrophotometrically determined nitrite levels were recorded for all dental implant sites. Measures for early (n = 16) and delayed (n = 14) loaded dental implants were comparatively analysed for a period of 18 months. Some random correlations between PISF volume and marginal bone level, PISF nitrite level and marginal bone level and PISF volume and PISF nitrite content, and RFA and PISF volume were observed. However, the only constant correlation was noticed between implant stability (RFA scores) and marginal bone level. This correlation was negative and significant for all dental implants and for delayed loaded implants (P < 0AE05). The pattern of loading seemed to affect the extent, but not the pattern of this relationship. While some of the implant-related measures may be strongly associated (e.g. dental implant stability and marginal bone level), not all measures from a single implant site are likely to be related. Such associations may be under the influence of a variety of factors including the loading protocol of dental implants.
Journal of Functional Biomaterials
The most commonly used material in dental implants and their abutments is titanium. Zirconia is a more aesthetic alternative to titanium abutments; however, it is much harder. There are concerns that zirconia could damage the surface of the implant over time, especially in less stable connections. The aim was to evaluate the wear of implants with different platforms connected to titanium and zirconia abutments. A total of six implants were evaluated, two of each connection type: external hexagon, tri-channel, and conical connections (n = 2). Half of the implants were connected to zirconia abutments, and the other half to titanium abutments (n = 3). The implants were then cyclically loaded. The implant platforms were evaluated by digital superimposing micro CT files and calculating the area of the loss surface (wear). In all the implants, a statistically significant loss of the surface area (p = 0.028) was observed when comparing the area before and after cyclic loading. The average ...
Correlation of M-L, Leinfelder, and USPHS clinical evaluation techniques for wear
Dental Materials, 1990
Most recent clinical research studies on wear of posterior composite restorations have used the USPHS and Leinfelder measuring techniques. New studies are adopting the Moffa-Lugassy (M-L) technique. However, to date there has been no means of comparing results of the different techniques. The objective of this study was to correlate the M-L scale wear values to Leinfelder scale wear values and to USPHS scale alfa-bravo transitions, so that data can be pooled across studies for comparisons. M-L evaluations were made for 221 restorations previously evaluated by the USPHS and Leinfelder methods. The M-L wear values were determined as the mean of three independent evaluators' values. At the USPHS a[fa-bravo transition, the mean Leinfelder wear value was 192 p.m, and the mean M-L value was 97 p.m. The correlation coefficient for the linear regression of M-L values vs. Leinfelder values was 0.87. The scales were linearly related, with a slope of 0.52. The average values for M-L readings of wear were statistically different and approximately half the Leinfelder values.
A new method to quantify wear using implant supported restorations
Dental Materials, 2000
Objectives: To design a novel technique to assess the wear of prosthodontic veneering materials. Further to determine whether accurate transfer between the oral cavity and the measuring device is achievable and assess the reproducibility of the coordinates generated by the measuring system. Methods: The system is based on the repositioning capacity of an octagonal connector of the ITI ᭨ implant system. The same type of connector was screwed onto the clinical implants that supported the experimental restorations and secured to the x-y table of the measuring device. The measuring setup also comprised a z-axis LVDT displacement gauge that allowed the entire surface of the restorations to be profiled and digitized. The system was under the control of a PC equipped with custom-made software that set the position of the stepping motors, lifted and lowered the z-axis probe, and registered and wrote the x-, y-and z-axis coordinates. Final numerical adjustments and analyses were performed using a commercial array-oriented software package. Validation procedures were performed using a specially designed calibration surface. Results: On repeated profile tracings, the measurement error was less than 2 mm. When the calibration surface was removed between measurements as during clinical trials, the measurement error increased to ca. 5 mm. Significance: The measurement error of the testing procedure including transfer to and from the mouth is^5 mm.
Evaluation of change in implant abutment after teeth surface modifications
2021
The surface modifications in teeth increase the retentive strength of cemented castings by providing micro as well as macro retentive ridge and groove patterns. Restoring the dental implants with cement-retained prosthesis is well known. Therefore, it is of interest to compare retentive property of implant abutments with and without circumferential grooves. Hence, 20 straight shoulder type titanium abutments were with abutment screws as well as prefabricated plastic copings and corresponding 12 mm-long stainless steel laboratory implant analogs were used. The abutments were divided into two subgroups of 10 abutments each: without grooves and with grooves. After thermocycling and storing the cemented abutments in water at 37°C water for 6 days they were assembled in the Universal testing machine and subjected to a pullout test (retention) at a crosshead speed of 5.0mm/min to record forces in Newton. Data suggest that the addition of grooves increased the retention. The mean retentive...
The Journal of Advanced Prosthodontics, 2019
PURPOSE. To evaluate the influence of cyclic loading on phase transformation of zirconia abutments and to compare the effectiveness of three different quantitative ageing assessment techniques. MATERIALS AND METHODS. Thirty two Y-TZP prostheses fabricated from two brands, InCoris ZI and Ceramill ZI, were cemented to titanium bases and equally divided into two subgroups (n=8): control group without any treatment and aged group with cyclic loading between 20 N and 98 N for 100,000 cycles at 4 Hz in distilled water at 37°C. The tetragonal-to-monoclinic phase transformation was assessed by (i) conventional x-ray diffraction (XRD), (ii) micro x-ray diffraction (µXRD), and (iii) micro-Raman spectroscopy. The monoclinic-phase fractions (M%) were compared by two-way ANOVA. RESULTS. InCoris Zi presented significantly higher M% than Ceramill Zi in both control and aged groups (P<.001). Both materials exhibited significant phase transformation with monoclinicphase of 1 to 3% more in aged groups than controls for all three assessment techniques. The comparable M% was quantified by both µXRD and XRD. The highest M% was assessed with micro-Raman. CONCLUSION. Cyclic loading produced significant phase transformation in tested Y-TZP prostheses. The micro-Raman spectroscopy could be used as an alternative to XRD and µXRD.
Twelve-month results of a clinical wear study of three artificial tooth materials
The Journal of Prosthetic Dentistry, 1995
T e r r y J . L i n d q u i s t , D D S , M S , a R o b e r t E. O g l e , D D S , b a n d E l a i n e L. D a v i s , P h D c School of Dental Medicine, State University of New York at Buffalo, Buffalo, N.Y. This s t u d y c o m p a r e d in vivo w e a r of a n e w artificial tooth material w i t h that of e x i s t i n g artificial tooth materials. Artificial tooth w e a r w a s d e t e r m i n e d by m e a s u r i n g h e i g h t c h a n g e s of selected p o i n t s on c o n t a c t i n g tooth surfaces in patients w i t h c o m p l e t e d e n t u r e s d u r i n g a 12-month period. T h e s e results are part of an o n g o i n g 3-year clinical study. A total of 67 patients w e r e r a n d o m i z e d to one of three t r e a t m e n t g r o u p s in this double-blind study. Group 1 r e c e i v e d d e n t u r e s w i t h e x i s t i n g artificial tooth materials. Group 2 r e c e i v e d d e n t u