scholarly journals Ex Vivo Assessment of Natural Teeth Wear against Zirconia and Novel Glass-Fiber-Reinforced Composite Crowns in Primary Teeth by a Three-Dimensional Assessment Method

2021 ◽  
Vol 2021 ◽  
pp. 1-7
Author(s):  
Abhinav Talekar ◽  
Gayatri Chaudhari ◽  
Sreekanth Kumar Mallineni ◽  
Sneha Kothare ◽  
Amol Patil ◽  
...  
Keyword(s):  
Clinical Practice ◽  
Glass Fiber ◽  
Primary Teeth ◽  
Fiber Reinforced ◽  
Fiber Reinforced Composite ◽  
Reinforced Composite ◽  
Glass Fiber Reinforced ◽  
Study Results ◽  
Significant Difference ◽  
Natural Teeth

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, highly significant difference ( p < 0.001 ) in the ZR group, and no significant difference in the GFRC group. Conclusion. There is more significant wear loss of glass-fiber-reinforced composite discs as compared to zirconia. In addition, the wear of the antagonistic tooth with zirconia and natural teeth is more remarkable than with GFRC. There is a vast difference of microhardness between natural teeth and zirconia (almost 10 times higher) which suggests further scope of study. Clinical Relevance. Pediatric dentistry deals with the transition of dentition from primary to permanent through mixed dentition. Selection of restorative material needs to be done cautiously when we are dealing with primary teeth and young permanent teeth as antagonistic teeth. Wear of the crown material itself and opposing natural teeth are essential factors that should be considered in selecting crowns in clinical practice. The present study results can be extrapolated to clinical practice, and the practitioner can consider various factors in selecting full-coverage crowns for primary teeth. The vast difference in aesthetic crowns and natural teeth microhardness indicates a further need for research. Additionally, there is no literature published for the recently launched GFRCs.

scholarly journals Clinical Evaluation of the Effectiveness of Glass Fiber-reinforced Composite Space Maintainer vs Band-and-loop Space Maintainer following Loss of Primary Teeth: An in vivo Study

2017 ◽  
Vol 1 (1) ◽  
pp. 5-9
Author(s):  
Yusuf Chunawala ◽  
Abdul Morawala ◽  
Arti Ambiye ◽  
Kapil Jain ◽  
Shruti Kataria
Keyword(s):  
Glass Fiber ◽  
Loop Space ◽  
Primary Teeth ◽  
Fiber Reinforced ◽  
Fiber Reinforced Composite ◽  
Reinforced Composite ◽  
Glass Fiber Reinforced ◽  
Group I ◽  
Space Maintainer ◽  
Band And Loop

ABSTRACT Introduction and aim Premature exfoliation or extraction of primary tooth may lead to loss of space due to drifting of the adjacent teeth. This may also lead to undesirable effects, such as impaction of the succedaneous tooth, overeruption of the opposing tooth, and a shift of the midline, with consequent functional impairment. It is prudent to consider space maintenance when primary teeth are lost prematurely. The current study aims to clinically evaluate the effectiveness of space maintainers comparing conventional band and loop space maintainer with glass fiber-reinforced space maintainer following loss of primary teeth in mixed dentition. Materials and methods A total of 30 children aged 4 to 8 years were randomly assigned into two groups – band-and-loop space maintainer (group I) and glass fiber-reinforced composite (GFRC) space maintainer (group II). Distortion/dislodgment of the loop or the fiber frame, fracture of loop or fiber frame, gingival health, and space loss were evaluated clinically and radiographically at 1, 3, 6, and 12 months interval. Gingival health was assessed by gingival index given by Loe and Silness. Results Based on the statistical analysis, overall success rate of group I was found to be 69.2% and of group II was 95.7% (p = 0.026), which was statistically significant. Conclusion The GFRC space maintainers showed an overall success rate compared with band-and-loop space maintainers. How to cite this article Kataria S, Chunawala Y, Morawala A, Jain K, Ambiye A. Clinical Evaluation of the Effectiveness of Glass Fiber-reinforced Composite Space Maintainer vs Band-and-loop Space Maintainer following Loss of Primary Teeth: An in vivo Study. Int J Clin Dent Res 2017;1(1):5-9.

The effect of nanoparticle additive on surface milling in glass fiber reinforced composite structures

2021 ◽  
pp. 096739112110141
Author(s):  
Ferhat Ceritbinmez ◽  
Ahmet Yapici ◽  
Erdoğan Kanca
Keyword(s):  
Composite Materials ◽  
Glass Fiber ◽  
Composite Structures ◽  
Fiber Composite ◽  
Cutting Speed ◽  
Fiber Reinforced ◽  
Fiber Reinforced Composite ◽  
Reinforced Composite ◽  
Glass Fiber Reinforced ◽  
Composite Layers

In this study, the effect of adding nanosize additive to glass fiber reinforced composite plates on mechanical properties and surface milling was investigated. In the light of the investigations, with the addition of MWCNTs additive in the composite production, the strength of the material has been changed and the more durable composite materials have been obtained. Slots were opened with different cutting speed and feed rate parameters to the composite layers. Surface roughness of the composite layers and slot size were examined and also abrasions of cutting tools used in cutting process were determined. It was observed that the addition of nanoparticles to the laminated glass fiber composite materials played an effective role in the strength of the material and caused cutting tool wear.

scholarly journals Fatigue performance of nanoclay filled glass fiber reinforced hybrid composite laminate

2017 ◽  
Author(s):  
◽  
John Olumide Olusanya
Keyword(s):  
Fatigue Life ◽  
Service Life ◽  
Glass Fiber ◽  
Residual Strength ◽  
Composite Structures ◽  
Fatigue Performance ◽  
Fiber Reinforced ◽  
Fiber Reinforced Composite ◽  
Reinforced Composite ◽  
Glass Fiber Reinforced

In this study, the fatigue life of fiber reinforced composite (FRC) materials system was investigated. A nano-filler was used to increase the service life of the composite structures under cyclical loading since such structures require improved structural integrity and longer service life. Behaviour of glass fiber reinforced composite (GFRC) enhanced with various weight percentages (1 to 5 wt. %) of Cloisite 30B montmorillonite (MMT) clay was studied under static and fatigue loading. Epoxy clay nanocomposite (ECN) and hybrid nanoclay/GFRC laminates were characterised using differential scanning calorimetry (DSC) and dynamic mechanical analysis (DMA). The mechanical properties of neat GFRC and hybrid nanoclay/GFRC laminates were evaluated. Fatigue study of the composite laminates was conducted and presented using the following parameter; matrix crack initiation and propagation, interfacial debonding, delamination and S–N relationship. Residual strength of the materials was evaluated using DMA to determine the reliability of the hybrid nanoclay/GFRC laminates. The results showed that ECN and hybrid nanoclay/GFRC laminates exhibited substantial improvement in most tests when compared to composite without nanoclay. The toughening mechanism of the nanoclay in the GFRC up to 3 wt. % gave 17%, 24% and 56% improvement in tensile, flexural and impact properties respectively. In the fatigue performance, less crack propagations was found in the hybrid nanoclay/GFRC laminates. Fatigue life of hybrid nanoclay/GFRC laminate was increased by 625% at the nanoclay addition up to 3 wt. % when compared to neat GFRC laminate. The residual strength of the composite materials revealed that hybrid nanoclay/GFRC showed less storage modulus reduction after fatigue. Likewise, a positive shift toward the right was found in the tan delta glass transition temperature (Tg) of 3 wt. % nanoclay/GFRC laminate after fatigue. It was concluded that the application of nanoclay in the GFRC improved the performance of the material. The hybrid nanoclay/GFRC material can therefore be recommended mechanically and thermally for longer usage in structural application.

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