scholarly journals Classification and Properties of Dental Zirconia as Implant Fixtures and Superstructures

Materials ◽  
2021 ◽  
Vol 14 (17) ◽  
pp. 4879
Author(s):  
Seiji Ban
Keyword(s):  
Mechanical Strength ◽  
Bacterial Adhesion ◽  
Contact Region ◽  
Dental Materials ◽  
Occlusal Contact ◽  
Suitable Material ◽  
Yttria Content ◽  
Occlusal Wear ◽  
Alumina Composites ◽  
Oral Condition

Various types of zirconia are widely used for the fabrication of dental implant superstructures and fixtures. Zirconia–alumina composites, such as ATZ and NanoZR, are adequate for implant fixtures because they have excellent mechanical strength in spite of insufficient esthetic properties. On the other hand, yttria-stabilized zirconia has been used for implant superstructures because of sufficient esthetic properties. They are classified to 12 types with yttria content, monochromatic/polychromatic, uniform/hybrid composition, and monolayer/multilayer. Zirconia with a higher yttria content has higher translucency and lower mechanical strength. Fracture strength of superstructures strongly depends on the strength on the occlusal contact region. It suggests that adequate zirconia should be selected as the superstructure crown, depending on whether strength or esthetics is prioritized. Low temperature degradation of zirconia decreases with yttria content, but even 3Y zirconia has a sufficient durability in oral condition. Although zirconia is the hardest dental materials, zirconia restorative rarely subjects the antagonist teeth to occlusal wear when it is mirror polished. Furthermore, zirconia has less bacterial adhesion and better soft tissue adhesion when it is mirror polished. This indicates that zirconia has advantageous for implant superstructures. As implant fixtures, zirconia is required for surface modification to obtain osseointegration to bone. Various surface treatments, such as roughening, surface activation, and coating, has been developed and improved. It is concluded that an adequately selected zirconia is a suitable material as implant superstructures and fixtures because of mechanically, esthetically, and biologically excellent properties.

The Management of Advanced Tooth Wear Using the T-Scan/BioEMG Synchronization Module

2015 ◽  
pp. 467-521
Author(s):  
Teresa Sierpińska
Keyword(s):  
Dental Treatment ◽  
Tooth Wear ◽  
Masticatory Muscles ◽  
Activity Level ◽  
Occlusal Contact ◽  
Long Term Stability ◽  
Occlusal Wear ◽  
Synchronization Module ◽  
Level Information

Tooth wear is considered a normal, age dependent, physiological process that leads to the loss of enamel and dentine. However, in some cases the process is so progressive that it may be pathologic. The focus of this chapter is to present the consequences of advanced tooth wear resultant from parafunction, excessive masticatory forces, imbalanced occlusal contacts, and hyperactive masticatory muscles. This chapter also outlines preventative strategies that can predictably reduce the progression of pathologic wear, which employ the T-Scan 8/BioEMG synchronization module. These two objective companion technologies assess the occlusion before, during, and after dental treatment, as well as predictably control the long-term stability of newly installed fixed, implant-supported, or removable prostheses. Their synchronization correlates muscle activity level information directly to occlusal contact force and time-sequencing information, which when applied together in the wear patient can be instrumental in tempering and eliminating pathologic occlusal wear.

Shear Strength Testing of Bonded Joints of Dental Materials

2014 ◽  
Vol 224 ◽  
pp. 198-203 ◽  
Author(s):  
Mateusz Wirwicki ◽  
Tomasz Topoliński
Keyword(s):  
Mechanical Strength ◽  
Adhesive Bonding ◽  
Dental Materials ◽  
Fatigue Tests ◽  
Bonded Joints ◽  
Bonding Agents ◽  
European Standards ◽  
Bonding Method ◽  
Dental Applications ◽  
New Generation

Zirconium dioxide is a material more and more used by technicians and dental surgeons due to its chemical composition and excellent mechanical strength. It features high biocompatibility and may be used even in 6-unit fixed dental bridges. Adhesive bonding is one of the methods used in dental applications. New generation bonding agents featuring high mechanical strength are widely available on the market. This article presents the equipment designed and manufactured to European Standards for bonded joint testing as well as specimen geometry and bonding method. Monotonic and fatigue tests of bonded joints were performed, the results were presented and Weibull analysis was performed.

The Limitations of Traditional Non-Digital Occlusal Indicators When Compared to the T-Scan Computerized Occlusal Analysis Technology

2017 ◽  
pp. 1528-1555
Author(s):  
Sarah Qadeer, BDS, MSD
Keyword(s):  
Contact Force ◽  
Dental Materials ◽  
Digital Data ◽  
Dental Practice ◽  
Modern Material ◽  
Occlusal Force ◽  
Occlusal Contact ◽  
Impression Materials ◽  
Widespread Belief ◽  
Material Studies

The traditional occlusal indicators used in dental practice are articulation papers, shim-stock foils, elastomeric impression materials, and occlusal wax strips. These static dental materials have been widely believed to have occlusal force descriptive capability. However, modern material studies are challenging the widespread belief that occlusal indicator materials can measure differing occlusal force levels. This chapter evaluates the force reporting limitations of these static occlusal indicators and discusses how clinicians subjectively interpret their appearance characteristics to determine differing occlusal force levels. This chapter then compares these non-digital occlusal indicators to computerized occlusal analysis technology that records and displays precise, quantifiable, relative occlusal force variances and occlusal contact timing sequences. This digital data aids the clinician in making a more accurate occlusal analysis and can guide the clinician in the correction of occlusal contact force and timing abnormalities, thereby eliminating the subjectivity that is inherent in traditional occlusal indicator use.

Tooth Wear

2020 ◽  
pp. 879-943
Author(s):  
Teresa Sierpińska, MD PhD
Keyword(s):  
Dental Treatment ◽  
Tooth Wear ◽  
Masticatory Muscles ◽  
Activity Level ◽  
Occlusal Contact ◽  
Long Term Stability ◽  
Occlusal Wear ◽  
Synchronization Module ◽  
Level Information

Tooth wear is considered a normal, age-dependent, physiological process that leads to the loss of enamel and dentine. However, in some cases the process is so progressive that it may be regarded as severe or pathological. The focus of this chapter is to present the consequences of tooth wear resultant from mechanical reasons, such as parafunction, excessive masticatory forces, imbalanced occlusal contacts, and hyperactive masticatory muscles. This chapter will also outline preventative strategies that can predictably reduce the progression of pathologic wear, which employ the T-Scan 8/BioEMG synchronization module. These two objective companion technologies assess the occlusion before, during, and after dental treatment, as well as predictably control the long-term stability of newly-installed fixed, implant-supported, or removable prostheses. Their synchronization correlates muscle activity level information directly to occlusal contact force and time-sequencing information, which when applied together in the wear patient, can be instrumental in tempering and eliminating pathologic occlusal wear.

scholarly journals Plasma-based Fluorine Ion Implantation into Dental Materials for Inhibition of Bacterial Adhesion

2006 ◽  
Vol 25 (4) ◽  
pp. 684-692 ◽  
Author(s):  
Kenji ARITA ◽  
Yukari SHINONAGA ◽  
Mizuho NISHINO
Keyword(s):  
Ion Implantation ◽  
Bacterial Adhesion ◽  
Dental Materials

scholarly journals Soft Lithography and Minimally Human Invasive Technique for Rapid Screening of Oral Biofilm Formation on New Microfabricated Dental Material Surfaces

2018 ◽  
Vol 2018 ◽  
pp. 1-5
Author(s):  
Marta Alvarez-Escobar ◽  
Sidónio C. Freitas ◽  
Derek Hansford ◽  
Fernando J. Monteiro ◽  
Alejandro Pelaez-Vargas
Keyword(s):  
Bacterial Adhesion ◽  
Soft Lithography ◽  
Dental Materials ◽  
Rapid Screening ◽  
Invasive Technique ◽  
Oral Biofilm ◽  
Pdms Surface ◽  
Flat Surfaces ◽  
The University ◽  
Present Pilot Study

Introduction. Microfabrication offers opportunities to study surface concepts focused to reduce bacterial adhesion on implants using human minimally invasive rapid screening (hMIRS). Wide information is available about cell/biomaterial interactions using eukaryotic and prokaryotic cells on surfaces of dental materials with different topographies, but studies using human being are still limited. Objective. To evaluate a synergy of microfabrication and hMIRS to study the bacterial adhesion on micropatterned surfaces for dental materials. Materials and Methods. Micropatterned and flat surfaces on biomedical PDMS disks were produced by soft lithography. The hMIRS approach was used to evaluate the total oral bacterial adhesion on PDMS surfaces placed in the oral cavity of five volunteers (the study was approved by the University Ethical Committee). After 24 h, the disks were analyzed using MTT assay and light microscopy. Results. In the present pilot study, microwell structures were microfabricated on the PDMS surface via soft lithography with a spacing of 5 µm. Overall, bacterial adhesion did not significantly differ between the flat and micropatterned surfaces. However, individual analysis of two subjects showed greater bacterial adhesion on the micropatterned surfaces than on the flat surfaces. Significance. Microfabrication and hMIRS might be implemented to study the cell/biomaterial interactions for dental materials.

scholarly journals Bacterial Adhesion on Glass–Ionomer Cements and Micro/Nano Hybrid Composite Dental Surfaces

Coatings ◽  
2021 ◽  
Vol 11 (2) ◽  
pp. 235
Author(s):  
Klemen Bohinc ◽  
Erna Tintor ◽  
Davor Kovačević ◽  
Rajko Vidrih ◽  
Anamarija Zore ◽  
...  
Keyword(s):  
Streptococcus Mutans ◽  
Hybrid Composite ◽  
Bacterial Adhesion ◽  
Dental Materials ◽  
Black Tea ◽  
Ceramic Composites ◽  
Inhibitory Effect ◽  
Glass Ionomer Cements ◽  
Glass Ionomer ◽  
Composite Surface

Dental restorations need to reproduce the aspect of the natural teeth of the patient, and must be non-toxic, biocompatible, and have good mechanical properties so that they can last for longer. The aim of this study was to determine the extent of bacterial adhesion of Streptococcus mutans on four different dental material surfaces, i.e., two glass–ionomer cements (Fuji conventional and Fuji hybrid) and two ceramic composites (Micro hybrid composite and Nano hybrid composite). To understand the bacterial adhesion on these four different dental materials, various surface properties were measured: roughness, contact angle, CIE color parameters and zeta potential. We found that the greatest adhesion extent was obtained for the Nano hybrid composite surface. The pronounced adhesion is the interplay between the relatively high roughness and hydrophilicity of the Nano hybrid composite surface. Color changes upon immersing ceramic composites in red wine and black tea proved that both beverages adhered to them. Black tea adhered more intensively than wine, and showed a higher inhibitory effect on the growth of Streptococcus mutans and Staphylococcus aureus.

scholarly journals In vivo wear of CAD-CAM composite versus lithium disilicate full coverage first-molar restorations: a pilot study over 2 years

2020 ◽  
Vol 24 (12) ◽  
pp. 4301-4311
Author(s):  
Jan-Frederik Güth ◽  
Kurt Erdelt ◽  
Christine Keul ◽  
Gintare Burian ◽  
Josef Schweiger ◽  
...  
Keyword(s):  
Wear Behavior ◽  
Lithium Disilicate ◽  
Tissue Loss ◽  
Invasive Treatment ◽  
Occlusal Contact ◽  
Wear Rates ◽  
Occlusal Wear ◽  
Cad Cam ◽  
Second Year

Abstract Objectives To present a digital approach to measure and compare material wear behavior of antagonistic first molar restorations made of an experimental CAD/CAM composite (COMP) and lithium disilicate ceramic (LS2) in patients with reconstructed vertical dimension of occlusion (VDO) after generalized hard tissue loss. Methods A total of 12 patients underwent complete full jaw rehabilitation with full occlusal coverage restorations made either of COMP or LS2. The first molar restorations (n = 48) were chosen for wear examination. At annual recall appointments, polyether impressions were taken, and resulting plaster casts were digitalized using a laboratory scanner. Mean observation period was 371 days for first and 769 days for second year. The resulting 96 datasets were analyzed by superimposition of 3-D datasets using an iterative best-fit method. Based on the superimposition data, the wear rates of the occlusal contact areas (OCAs) were calculated. Results For antagonistic restorations made of COMP, the average wear rate was 24.8 ± 13.3 μm/month, while for LS2, it was 9.5 ± 4.3 μm/month in first year, with significant differences (p < 0.0001) between the materials. In second year, monthly wear rates decreased significantly for both materials: COMP (16.2 ± 10.7 μm/month) and LS2 (5.5 ± 3.3 μm/month). Statistical comparison between wear time showed significant differences for both materials: COMP p < 0.037 and LS2 p < 0.001. A logarithmic fit (COMP R2 = 0.081; LS2 R2 = 0.038) of the data was calculated to estimate the wear progression. Significance In patients with reconstructed VDO, restorations made of LS2 show a more stable wear behavior than ones out of experimental CAD/CAM composite. In cases of complete rehabilitation, load bearing CAD/CAM-composite restorations should be critically considered for application due to their occlusal wear behavior. However, when choosing a restorative material, not only the functional occlusal stability should be taken into account but also the prospect of minimally invasive treatment with maximum preservation of natural tooth structures.

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