Wear Resistance, Color Stability and Displacement Resistance of Milled PEEK Crowns Compared to Zirconia Crowns under Stimulated Chewing and High-Performance Aging (original) (raw)
Related papers
A study on the in-vitro wear of the natural tooth structure by opposing zirconia or dental porcelain
2010
PURPOSE. This study was conducted to evaluate clinical validity of a zirconia full-coverage crown by comparing zirconia' s wear capacity over antagonistic teeth with that of feldspathic dental porcelain. MATERIALS AND METHODS. The subject groups were divided into three groups: the polished feldspathic dental porcelain group (Group 1), the polished zirconia group (Group 2), and the polished zirconia with glazing group (Group 3). Twenty specimens were prepared from each group. Each procedure such as plasticity, condensation, and glazing was conducted according to the manufacturer' s manual. A wear test was conducted with 240,000 chewing cycles using a dual-axis chewing simulator. The degree of wear of the antagonistic teeth was calculated by measuring the volume loss using a three-dimensional profiling system and ANSUR 3D software. The statistical significance of the measured degree of wear was tested with a significant level of 5% using one-way ANOVA and the Tukey test. RESULTS. The degrees of wear of the antagonistic teeth were 0.119 ± 0.059 mm 3 in Group 1, 0.078 ± 0.063 mm 3 in Group 3, and 0.031 ± 0.033 mm 3 in Group 2. Statistical significance was found between Group 1 and Groups 2 and between Group 2 and 3, whereas no statistical significance was found between Group 1 and Group 3. CONCLUSION. Despite the limitations of this study on the evaluation of antagonistic teeth wear, the degree of antagonistic tooth wear was less in zirconia than feldspathic dental porcelain, representing that the zirconia may be more beneficial in terms of antagonistic tooth wear. [
Egyptian Dental Journal
Purpose: Due to a lack of data on their wear behavior, the study aimed to analyze the twobody wear rate of two different composite veneered computer-aided design/computer-aided manufacturing (CAD/CAM) polyetheretherketone (PEEK) posterior crowns after wear simulation using 3D surface deviation. Materials and Methods: Twenty duplicated epoxy resin models of prepared mandibular first molar to receive an all-ceramic crown were fabricated. Twenty CAD/CAM PEEK substructures were manufactured and divided according to the veneering technique into two groups (n=10); group (H): CAD/CAM High Impact Polymer Composite (HIPC) veneered PEEK substructures, and group (C): Conventional Crea.lign composite veneered PEEK substructures (control). The specimens underwent thermal and mechanical loading (49N, 5/55˚C; 120,000 chewing cycles) as antagonized by steatite ceramic balls. 3D surface deviation analysis using a 3D dental scanner and Geomagic Design X software was applied before and after chewing simulation to determine the volumetric wear loss (mm 3). Data were statistically analyzed with the Mann-Whitney U test to compare the two groups. The significance level was set at p≤0.05.
International Journal of Dentistry, 2021
Objectives The main purpose of the study was to assess the material wear, antagonistic natural primary teeth wear, and microhardness of zirconia (ZR), a recently launched novel glass-fiber-reinforced composite crown (GFRC). The research question was, are these aesthetic crowns resulting in antagonistic natural primary tooth wear and the crown material itself? Methods Forty-five primary canines were divided into three groups (15 per group) and mounted against Zr (Group A), GFRC (Group B), and natural teeth as control (Group C) in the wear test machine. All samples were assessed for surface wear with pre- and post-3-dimensional scanning. In addition, microhardness was assessed for all three groups. Results The mean microhardness value for the Zr disc was 1157 ± 7 HV; for the GFRC disc, it was 29.35 ± 2 HV; while with natural teeth, it was 105 ± 4 HV. There was a statistically significant difference in teeth wear in the prescan and postscan in the natural tooth (p < 0.05) group, hig...
International Journal of Prosthodontics and Restorative Dentistry, 2023
Purpose: This in vitro study was carried out to compare the wear of opposing natural teeth caused by zirconia, resin nanoceramic restorations, and polymer-infiltrated ceramic network (PICN). Materials and methods: A total of 12 disk-shaped samples measuring 10 × 2 mm were milled from each of the following blanks-Zirconia disc (3M™ Lava ™ Plus), Lava ™ Ultimate computer-aided design and computer-aided manufacturing (CAD/CAM) blocks, and VITA ENAMIC ® CAD/CAM blocks. The samples were grouped as group I-zirconia (n = 12), group II-resin nanoceramics (n =12), and group III-PICN (n = 12). A total of 36 freshly extracted maxillary premolars were collected and allocated to three groups (n = 12 each). The extracted teeth were weighed and scanned for prewear. The disc samples were subjected to a two-body wear test against the natural teeth in a two-body wear machine for 10,000 cycles, and readings were recorded. The teeth were again weighed and subjected to postwear scans. The one-way analysis of variance (ANOVA) was done to find the significant difference among groups, and post hoc Bonferroni's test was done for intergroup comparisons. Results: The results revealed that there was a statistically significant difference (p = 0.001) in all three groups. The maximum amount of wear was seen with zirconia (0.2912 ± 0.151 mm) followed by resin nanoceramic (0.1345 ± 0.017 mm) and PICN (0.1233 ± 0.007 mm). The maximum amount of weight loss was seen with zirconia (0.0100 ± 0.0048 gm), followed by resin nanoceramic (0.0037 ± 0.0037 gm), and the least amount of weight loss was seen in PICN (0.0017 ± 0.0009 gm). Conclusion: PICN displayed the least volumetric loss of the opposing natural teeth (both according to the weight and change in linear dimension), followed by resin nanoceramic and zirconia. In the case of bruxers, hybrid ceramics can be considered good alternatives to zirconia.
A method of comparing the wear resistance of various materials used for artificial teeth
RGO - Revista Gaúcha de Odontologia, 2014
OBJECTIVE: Abrasion resistance of three commercial brands of acrylic resin for artificial teeth, available on the domestic market (Biotone(r), Plus(r) and Vipi Dent Artiplus(r)) was evaluated by a new methodology called "Pirassununga Method ". METHODS: The Manufacturers produced the maxillary central incisor-shaped incisal resin specimens (n=27). These were embedded in chemically activated acrylic resin in an insulated metal matrix to fabricate test specimens, which were flattened on a lathe and refined manually with sandpaper. Wear testing was conducted in an experimental machine at the Vipi dental products factory. In the "Pirassununga Method" a polished metal sphere 4.8 mm in diameter, attached to a rotary device passes over the fixed specimens in programmable cycles, under 5N pressure, using distilled water as lubricant. In each sample, the groove caused by abrasion, was analyzed in two ways: Readout under a microscope to determine the breadth and depth of th...
SciDoc Publishers, 2021
Introduction: The treatment of carious primary molars has always been a problem for dentists. SSCs are exposed to the oral environment for many years and are influenced by physical and chemical factors such as saliva secretion, chewing, brushing, acidic drinks, abrasion, and biofilm composition. To counteract the effects of SSCs, they are coated with nano zirconia particles. Materials and Methods: This in vitro study was carried out at the saveetha institute of medical and technical science, and the zirconia coating was performed at University of Madras, Chennai. Total of 20 preformed stainless-steel crowns of the second primary mandibular molar from 3M (3M India Ltd) were evaluated in this study. One group had SSC (N=10) and the other group had of SCC were coated with nano-zirconia (N=10) and these crowns were evaluated for wear resistance Results: The microhardnesstest (VHN) assessed showed a higher range of indentation in nano zirconia coated SSCs than the preformed SSCs. In the wear test, the wear was more in nano zirconia coated SSCs than the preformed SSCs. Conclusion: To conclude, based on the present study, Nano zirconia coated on SSCs technique has high wear resistance and lower microhardness compared to SSCs. But the zirconia coated crowns are more esthetic when compared to SSCs.
F1000Research, 2019
Background: Surfaces of ceramic crowns are modified several times before being exposed to wear in the oral cavity. Grinding and different finishing procedures may be associated with teeth wear due to increased surface roughness. Limited data is available with regard to the effect of polishing procedures on the surface roughness and wear behavior of ceramic crowns. This study was conducted to assess the influence of polished and polished-ground-repolished surface finish on the roughness and wear performance of three ceramic crowns. Methods: 36 natural 1st molar teeth were prepared using a CNC milling machine and classified into three groups (n=12/group): zirconia, E-max and hybrid ceramic (VITA ENAMIC) crowns. Each group was classified into two subgroups (n=6/subgroup): polished and polished-ground-repolished crowns. Natural molar teeth served as an unrestored control group (n=6). All samples were loaded into a chewing simulator for 100,000 cycles and subjected to 600 thermo-cycles...
Journal of Clinical Medicine, 2020
Background: The aim of this systematic review and meta-analysis was to determine the wear sustained in the natural antagonist tooth in cases of full-coverage fixed-base prosthetic restorations or monolithic zirconia tooth-supported crowns, as well as to determine the wear in the restoration itself, both in the short- and medium-term and considering the factors that may influence wear. Material and methods: A systematic literature review and meta-analysis, based on Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA) recommendations, of clinical studies that evaluated wear in antagonist teeth in relation to fixed-prosthesis monolithic zirconia crowns. A total of 5 databases were consulted in the literature search: Pubmed-Medline, Cochrane, Scopus, Embase and Web of Science (WOS). After eliminating duplicated articles and applying the inclusion criteria, eight articles were selected for the qualitative analysis and four for the quantitative analysis. Results: Me...
Journal of Functional Biomaterials
Background: Although there are a few studies which compare fast and slow sintering in normal zirconia crowns, it is essential to compare the cracks and load-bearing capacity in zirconia screw-retained implant crowns between regular and speed sintering protocols. This research aimed to compare the surface structure, cracks, and load-bearing capacity in zirconia screw-retained implant crowns between regular sintering (RS) and speed sintering (SS) protocol with and without cyclic loading (fatigue). Methods: A total of 60 screw-retained crowns were fabricated from zirconia (Katana STML Block) by the CAD/CAM system. Then, 30 crowns were subjected to the RS protocol and 30 crowns were subjected to the SS protocol. Cyclic loading was done in half zirconia crowns (15 crowns in each group) using a chewing simulator CS-4.8/CS-4.4 at room temperature. The loading force was applied on the middle of the crowns by a metal stylus underwater at room temperature with a chewing simulator at an axial ...
The International Journal of Prosthodontics
To comparatively evaluate the amount of wear of natural enamel against a glazed full coverage monolithic zirconia crown and a polished monolithic zirconia crown at 6 and 12 months. Materials and Methods: Thirty subjects within the age range of 18 to 35 years participated in this study. The subjects received a total of 60 single crowns, which were divided into two groups: (1) 30 glazed monolithic zirconia crowns opposed by natural enamel (group A); and (2) 30 polished monolithic zirconia crowns opposed by natural enamel (group B). Each subject received a crown from both groups, placed bilaterally in endodontically treated maxillary or mandibular first molars. An impression was made of the opposing arch at 24 hours, 6 months, and 12 months. The resulting casts were scanned with a 3D optical scanner. The recall scans were superimposed and compared to baseline scans using 3D AutoCAD software. A control group was included to compare the wear values to natural enamel against natural enamel. Results: No significant difference (P = .855) was found in enamel wear between groups A (42.80 µm) and B (42.50 µm) after 6 months of use. However, a significant difference (P < .05) in enamel wear was found between group A (81.87 µm) and group B (71.43 µm) after 12 months of use. Conclusion: Glazed monolithic zirconia crowns cause more wear to the opposing enamel than polished monolithic zirconia crowns after 12 months of clinical use.