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Dental And Zirconia

João Paulo Mendes Tribst, Amanda Maria de Oliveira Dal Piva, Marcela Moreira Penteado, Alexandre Luiz Souto Borges, Marco Antonio Bottino
The aim of this study was to evaluate stress distribution in an occlusal veneer according to the restorative material, restoration thickness, and cement layer thickness. A tridimensional model of a human maxillary first molar with an occlusal veneer preparation was constructed using a modeling software of finite element analysis. The model was replicated 9 times to evaluate the factors: restoration thickness (0.6, 1.2, and 1.8 mm) and cement layer thickness (100, 200, and 300 μm). Then, each model received different restorative materials (High Translucency Zirconia - [YZHT], Lithium Disilicate - [LD], Zirconia Reinforced Lithium Silicate - [ZLS], Feldspathic - [F], and Hybrid Ceramic - [HC]), totaling forty-five groups...
November 29, 2018: Brazilian Oral Research
Ankur Dahiya, Nadim Z Baba, Mathew T Kattadiyil, Charles J Goodacre, Akshita Mann
STATEMENT OF PROBLEM: Excess cement around dental implants is a significant cause of peri-implant inflammation. Research has focused on approaches to cement removal, the type of cement used, and the different instruments used for cement removal with titanium abutments. However, data comparing zirconia with titanium abutments are lacking. PURPOSE: The purpose of this in vitro study was to compare the effectiveness of excess cement removal from zirconia and titanium custom abutments using an explorer and to compare the effects of cement removal on the abutment surfaces...
December 1, 2018: Journal of Prosthetic Dentistry
Ruizhi Yin, Min-Ho Lee, Tae-Sung Bae, Kwang-Yeob Song
This study was to evaluate the load bearing capacity of monolithic dental zirconia crowns, and the effect of surface finishing on fracture strength. (1) The zirconia plates were divided into 5 groups and polished by various types of polishing bur, every specimen was analyzed by surface roughness testing, and X-ray diffraction (XRD). (2) The zirconia crowns were classified into 4 groups corresponding to different surface treatments and thickness. All the crowns were cemented and subjected to a load of 7 kg for 5 min...
December 1, 2018: Dental Materials Journal
Alexander J G Lunt, Philip Chater, Annette Kleppe, Nikolaos Baimpas, Tee K Neo, Alexander M Korsunsky
OBJECTIVE: Residually strained porcelain is influential in the early onset of failure in Yttria Partially Stabilised Zirconia (YPSZ) - porcelain dental prosthesis. In order to improve current understanding it is necessary to increase the spatial resolution of residual strain analysis in these veneers. METHODS: Few techniques exist which can resolve residual stress in amorphous materials at the microscale resolution required. For this reason, recent developments in Pair Distribution Function (PDF) analysis of X-ray diffraction data of dental porcelain have been exploited...
November 29, 2018: Dental Materials: Official Publication of the Academy of Dental Materials
Masahiro Okada, Hiroaki Taketa, Yasuhiro Torii, Masao Irie, Takuya Matsumoto
OBJECTIVE: To assess the influence of sandblasting conditions applied to conventional-type yttria-stabilized tetragonal zirconia polycrystal (Y-TZP) on surface roughness, phase transformation, and biaxial flexural strength. METHODS: Commercially available Y-TZP (Lava Frame, 3M Dental Products) disks were used after sintering (specimen dimensions: 14mm in diameter and 1.2mm in thickness). The surfaces of specimens were ground, and then sandblast treatments were conducted at different pressures (0...
November 27, 2018: Dental Materials: Official Publication of the Academy of Dental Materials
Edwin Ruales-Carrera, Madalena Lucia Pinheiro Dias Engler, Paula Vaz, Mutlu Özcan, Claudia Angela Maziero Volpato
OBJECTIVE: Congenital absence of maxillary lateral incisors is a frequent clinical challenge which must be solved by a multidisciplinary approach in order to obtain an esthetic and functional restorative treatment. Noninvasive treatments, that are in accordance with the patients' expectations, should be the first therapeutic alternative. If the deciduous tooth is present, minimally invasive dental extraction followed by immediate dental implant placement and provisional restoration is indicated...
November 29, 2018: Journal of Esthetic and Restorative Dentistry
C Monaco, A Arena, J Štelemėkaitė, E Evangelisti, P Baldissara
PURPOSE: To quantify and to compare a gravimetric and three-dimensional (3D) analysis of the removed tooth structure for different complete crown preparations. METHODS: A total of 80 molar resin teeth and 8 preparation finishing lines were chosen: 1 for metal ceramic crowns (MCC); 3 for zirconia all-ceramic crowns: knife edge (ZirKnE), chamfer (ZirCha), and shoulder (ZirSho); 4 for lithium disilicate: light chamfer (LDLCha), chamfer (LDCha), shoulder (LDSho) and table top...
November 26, 2018: Journal of Prosthodontic Research
Fahad Bakitian, Przemek Seweryniak, Evaggelia Papia, Christel Larsson, Per Vult von Steyern
PURPOSE: To investigate the load-bearing capacity and failure mode of monolithic zirconia fixed dental prostheses (FDPs) fabricated with different connector designs and embrasure shaping methods. MATERIAL AND METHODS: Seventy 4-unit zirconia FDPs (with 2 premolar pontics) were fabricated and divided into 7 groups (n = 10) according to the different connector designs gained by using different embrasure shaping methods. The groups were as follows: monolithic FDPs fabricated with sharp embrasures, monolithic FDPs fabricated with blunt embrasures, monolithic FDPs fabricated with blunt embrasures and no occlusal embrasures, 2 groups of monolithic FDPs fabricated with blunt embrasures and interproximal separations made with diamond discs at the soft stage and at the fully sintered stage, and monolithic FDPs fabricated with blunt embrasures and interproximal separation accentuated by localized porcelain build-up...
November 26, 2018: Journal of Prosthodontics: Official Journal of the American College of Prosthodontists
Karthiga P, Ponnanikajamideen M, R Samuel Rajendran, Gurusamy Annadurai, S Rajeshkumar
Zirconia oxide nanoparticles (ZrO2 NPs) are known to be one of the neutral bioceramic metal compounds that has been widely used for their beneficial applications in many biomedical areas, in dental implants, bone joint replacements, drug delivery vehicles, and in various industrial applications. To study the effects of ZrO2 NPs on zebrafish model, we used early life stages of the zebrafish (Danio rerio) to examine such effects on embryonic development in this species. ZrO2 NPs were synthesized by the sol-gel method, size about 15-20 nm and characterized by SEM, EDX, XRD, FTIR, UV-Vis Spectra...
November 20, 2018: Drug and Chemical Toxicology
Ana Flavia Nunes E Reis, Gabriela Freitas Ramos, Tiago Moreira Bastos Campos, Pedro Henrique Condé Oliveira Prado, Getúlio Vasconcelos, Alexandre Luiz Souto Borges, Renata Marques de Melo
OBJECTIVES: The purpose of the study was to characterize the microstructure, constituents, and mechanical properties of mono and bilayered zirconia specimens infiltrated with silica by the sol gel method. METHODS: 180 zirconia discs (14-mm diameter) were divided in 3 groups (n = 60) according to thickness (1.2, 0.5 mm) and further divided in two groups (n = 30) according to treatment (infiltrated or not). Disk thickness was 1.2 mm for the control samples...
September 27, 2018: Journal of the Mechanical Behavior of Biomedical Materials
Tomohide Kondo, Futoshi Komine, Junichi Honda, Hiroki Takata, Yuta Moriya
PURPOSE: To determine the effect of veneering material and framework design on fracture loads of implant-supported zirconia molar fixed dental prostheses (FDPs). METHODS: Sixty-six zirconia FDPs were manufactured onto two implants and classified as uniform thickness (UT) or anatomic design (AD). These framework design groups were then further divided into three subgroups (n=11): feldspathic porcelain-veneered zirconia FDPs (PVZ), indirect composite-veneered zirconia FDPs (IVZ), and metal-ceramic FDPs (MC)...
November 13, 2018: Journal of Prosthodontic Research
Markus Rottmar, Eike Müller, Stefanie Guimond-Lischer, Marc Stephan, Simon Berner, Katharina Maniura-Weber
OBJECTIVES: In recent years, zirconia dental implants have gained increased attention especially for patients with thin gingival biotypes or patients seeking metal-free restoration. While physical and chemical material surface properties govern the blood-material interaction and subsequent osseointegration processes, the organizational principles underlying the interplay of biochemical and biophysical cues are still not well understood. Therefore, this study investigated how the interaction of a microstructured zirconia surface with blood influences its osseointegration potential compared to microstructured titanium with or without additional nanostructures...
November 10, 2018: Dental Materials: Official Publication of the Academy of Dental Materials
Ioannis Konstantinidis, Dimitra Trikka, Spyridon Gasparatos, Miltiadis E Mitsias
Aim/Purpose: The primary aim of this study was to examine the clinical performance of posterior monolithic single crowns in terms of failure or complications and the secondary aim was to assess the quality of these restorations according to the United States Public Health Service (USPHS) criteria. Methods: Ιn a private dental clinic, 65 patients with need of posterior crowns were restored with monolithic zirconia crowns. All the restorations were evaluated 6 and 12 months after their cementation. The modified United States Public Health Service (USPHS) criteria and periodontal parameters were applied for the clinical evaluation of the crowns...
November 12, 2018: International Journal of Environmental Research and Public Health
Chan Park, Sang-Won Park, Kwi-Dug Yun, Min-Kyung Ji, Sungwoo Kim, Yunzhi Peter Yang, Hyun-Pil Lim
We have investigated the effect of non-thermal atmospheric pressure plasma (NTAPP) treatment and the post process time on the bonding strength and surface sterilization of dental zirconia. Presintered zirconia specimens were manufactured as discs, and then subjected to a 30-min argon treatment (Ar, 99.999%; 10 L/min) using an NTAPP device. Five post-treatment durations were evaluated: control (no treatment), P0 (immediate), P1 (24 h), P2 (48 h), and P3 (72 h). The surface characteristics, shear bonding strength (SBS) with two resin cements, and Streptococcus mutans biofilm formation of these plasma-treated dental zirconia were tested...
November 9, 2018: Materials
Hong Cheng, Cong Dong, Fu-Qiang Zhang
PURPOSE: To evaluate the effect of tribochemical silica coating for zirconia bonding. METHODS: Sixty cut and fully sintered Lava frame zirconia blocks were randomly divided into 6 groups and subjected to 3 different surface treatments and 2 kinds of resin cement.The surface treatments were airborne-particle abrasion/silane, airborne-particle abrasion/CoJet Sand (tribochemical silica coating) /silane and no treatment(control), resin cements were RelyX Unicem and Panavia F2...
June 2018: Shanghai Kou Qiang Yi Xue, Shanghai Journal of Stomatology
Alexandre Barboza Elias, Renata Antoun Simão, Maíra Prado, Paulo Francisco Cesar, Glauco Botelho Dos Santos, Eduardo Moreira da Silva
STATEMENT OF PROBLEM: Nonthermal argon plasma may increase the surface energy of yttria-stabilized tetragonal zirconia polycrystal (Y-TZP) dental ceramics. However, studies that evaluated the effect of increased plasma treatment times on the bond strength of resin cements to Y-TZP ceramics are lacking. PURPOSE: The purpose of this in vitro study was to evaluate the effect of different nonthermal argon plasma (NTAP) treatment times on the surface energy and bond strength of a self-adhesive resin cement to Y-TZP ceramic...
November 5, 2018: Journal of Prosthetic Dentistry
Kim Clever, Karl Andreas Schlegel, Heinz Kniha, Georg Conrads, Lothar Rink, Ali Modabber, Frank Hölzle, Kristian Kniha
The purpose of this study was to assess host-derived parameters around dental zirconia and titanium implants and natural teeth during the occurrence of mucositis. After 4 weeks of perfect oral hygiene, 16 clinically profiled patients were asked to refrain from oral hygiene for 2 weeks, resulting in experimental plaque accumulation. This was followed by 4 weeks of perfect oral hygiene to reverse the inflammation. Immunological samples were analyzed for interleukin 6 (IL-6), tumour necrosis factor alpha (TNF-α), and interleukin 1β (IL-1β)...
November 5, 2018: International Journal of Oral and Maxillofacial Surgery
Kai-Hendrik Bormann, Nils-Claudius Gellrich, Heinz Kniha, Sabine Schild, Dieter Weingart, Michael Gahlert
BACKGROUND: Traditionally, dental implants have been made from titanium or titanium alloys. Alternatively, zirconia-based ceramic implants have been developed with similar characteristics of functional strength and osseointegration. Ceramic implants offer advantages in certain settings, e.g. in patients who object to metal dental implants. The aim of this study was to investigate the mid-term (36 months) clinical performance of a ceramic monotype implant in single-tooth edentulous area...
November 1, 2018: BMC Oral Health
Blanca I Flores-Ferreyra, Rogelio J Scougall-Vilchis, Ulises Velazquez-Enriquez, Rene Garcia-Contreras, Lizzeth Aguillon-Sol, Oscar F Olea-Mejia
The surface roughness, morphology and shear bond strength (SBS) of dental zirconia using three different surface treatment techniques were evaluated. Three groups of sintered zirconia blocks were treated as follow, 1) Airborne-particle abrasion (APA) group (G1-APA), 50-µm Al2O3; 2) APA and 9% hydrofluoric acid etching (G2-HF); 3) APA and Sodium Hydroxide (G3-NaOH). The specimens were evaluated for roughness [atomic force microscope (AFM)], morphology [Scanning Electron Microscope (SEM)] and for SBS in the universal testing machine...
November 1, 2018: Dental Materials Journal
Haruki Shimizu, Masanao Inokoshi, Tomohiro Takagaki, Motohiro Uo, Shunsuke Minakuchi
PURPOSE: To evaluate the bonding efficacy of 4-META/MMA-TBB resin to highly translucent zirconia subjected to various surface treatments. MATERIALS AND METHODS: Highly translucent zirconia specimens (Zpex Smile, Tosoh; 11.5 mm diameter, 5.0 mm thick) were mechanically pre-treated to improve micromechanical interlocking either by sandblasting with 50-µm Al2O3 particles (Kulzer Japan) or subjecting the specimens to a low-pressure plasma treatment (PM100, Yamato), or evaluated using the as-sintered surfaces as controls...
2018: Journal of Adhesive Dentistry
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