Your browser doesn't support javascript.
loading
Mostrar: 20 | 50 | 100
Resultados 1 - 20 de 710
Filtrar
1.
J Clin Pediatr Dent ; 46(3): 211-218, 2022 May 01.
Artigo em Inglês | MEDLINE | ID: mdl-35830639

RESUMO

OBJECTIVES: With the recent improvements in technology, the expectation of minimal invasion and maximal comfort in caries removal techniques is increasing. This study aims to examine the effectiveness of six caries removal methods in primary teeth. STUDY DESIGN: Sixty primary molars (10 teeth in each groups) were used. The groups were: Group I (Tungsten Carbide Bur), Group II (Sono abrasion), Group III (Air abrasion), Group IV (Carisolv), Group V (Er:YAG Laser), Group VI (ART). In micro-CT scanning, mineral density at the cavity floor was examined before and after caries removal. After caries removal, the patency of the dentinal tubules was examined in two teeth from each group on SEM images. Statistical analyses were performed using Kruskal-Wallis, Wilcoxon tests. RESULTS: For six different caries removal methods, tooth mineral (inorganic, total) densities at cavity floors were compared among the groups after the procedures, and no statistically significant difference was found (p>0.05). On the SEM images, it was seen that the dentinal tubules were exposed and no smear layer was formed in the Carisolv group. Significant rough surfaces were exposed in the laser group. CONCLUSION: It was observed that alternative caries removal methods are at least as effective as the traditional method in primary teeth for clinical applications.


Assuntos
Cárie Dentária , Preparo da Cavidade Dentária , Abrasão Dental por Ar , Cárie Dentária/diagnóstico por imagem , Cárie Dentária/terapia , Suscetibilidade à Cárie Dentária , Preparo da Cavidade Dentária/métodos , Dentina/diagnóstico por imagem , Humanos , Microscopia Eletrônica de Varredura , Minerais , Propriedades de Superfície , Dente Decíduo , Microtomografia por Raio-X
2.
Dent Mater ; 38(8): e220-e230, 2022 Aug.
Artigo em Inglês | MEDLINE | ID: mdl-35750506

RESUMO

OBJECTIVE: This study evaluated the microshear bond strength of a resin cement to Y-TZP after different methods of TiO2 nanotubes (nTiO2) incorporation on pre-sintered Y-TZP surfaces. METHODS: nTiO2 were synthesized and incorporated on Y-TZP slices as follows (n = 15): 1) nTiO2 mixed with isopropyl alcohol/manual application (MAl); 2) nTiO2 mixed with acetone/manual application (MAc); 3) nTiO2 mixed with isopropyl alcohol/high-pressure vacuum application (HPVAl); 4) nTiO2 mixed with acetone/high-pressure vacuum application (HPVAc). As controls, surfaces were sandblasted with Al2O3 (OX) or Rocatec silicatization (ROC). All ceramics were sintered after nTiO2 incorporation. Surface treatments of OX and ROC were made after sintering. Surfaces were characterized by confocal laser microscopy, scanning electron microscopy (SEM) and energy-dispersive X-ray spectroscopy (EDS). Resin composite cylinders (1.40 mm diameter and 1 mm height) were cemented with a resin cement, stored in water at 37 °C for 24 h and thermocycled for 10 000 cycles before microshear bond strength evaluation. Data were analyzed with one-way ANOVA and Games-Howell (α = 0.05), and fracture analysis was performed using a stereomicroscope. RESULTS: EDS confirmed the presence of TiO2 on treated Y-TZP. The confocal analysis showed higher roughness for HPVAc and OX. There were significant differences between surface treatments (p < 0.001). HPVAl (22.96 ± 10.3), OX (34.16 ± 7.9) and ROC (27.71 ± 9.4) showed higher microshear bond strengths and were statistically similar (p > 0.05). MAC showed intermediary values, and HPVAc and MAl presented decreased bond strength, with a high percentage of premature debonding. CONCLUSION: High-pressure vacuum application of nTiO2 mixed with isopropyl alcohol was able to produce bond strength values compared to conventional air abrasion and Rocatec silicatization. SIGNIFICANCE: The infiltration of TiO2 nanostructures on the pre-sintered Y-TZP is an interesting approach that can improve bond strength without the need of sandblasting methods.


Assuntos
Colagem Dentária , Nanotubos , 2-Propanol , Acetona , Abrasão Dental por Ar , Colagem Dentária/métodos , Teste de Materiais , Microscopia Eletrônica de Varredura , Cimentos de Resina/química , Resistência ao Cisalhamento , Propriedades de Superfície , Titânio , Ítrio/química , Zircônio/química
3.
J Adhes Dent ; 24(1): 233-245, 2022 May 16.
Artigo em Inglês | MEDLINE | ID: mdl-35575656

RESUMO

PURPOSE: To identify and discuss the available surface treatments and adhesives for polyetheretherketone (PEEK) to increase its bond strength to resin-based materials used in dentistry. MATERIALS AND METHODS: The reporting of this scoping review was based on PRISMA. The study protocol was made available at: https://osf.io/4nur9/. Studies which evaluated PEEK surface treatments and its bond strength to resin-based materials were selected. The search was performed in PubMed, Scopus, Web of Sciences and Cochrane databases. The screening was undertaken by 3 independent researchers using the Rayyan program. A descriptive analysis was performed considering study characteristics and main findings (title, data of publication, authors, PEEK characteristics, surface treatments, control group, bonded set, luting agent, specimen geometry, storage, thermocycling, pre-test failures, test geometry, failure analysis, main findings, and compliance with normative guidelines). RESULTS: The initial search yielded 1965 articles, of which 32 were included for descriptive analysis. The review showed that the use of surface treatments and adhesives are important to promote bond strength to PEEK. Up until now, various surface treatments have been explored for bond improvement to PEEK. Sulfuric acid etching is commonly reported as promoting the highest bond strength, followed by alumina-particle air abrasion. Regarding adhesives, the use of a specific adhesive containing MMA, PETIA (pentaerythritol triacrylate), and dimethacrylates yields the best adhesive performance. CONCLUSION: Sulfuric acid etching and alumina particle air abrasion followed by application of bonding agents containing MMA, PETIA and dimethacrylates are the most effective choices to increase resin-based materials' adhesion to PEEK.


Assuntos
Colagem Dentária , Cimentos de Resina , Abrasão Dental por Ar , Óxido de Alumínio/química , Benzofenonas , Cimentos Dentários , Cetonas/química , Teste de Materiais , Polietilenoglicóis/química , Polímeros , Cimentos de Resina/química , Resistência ao Cisalhamento , Propriedades de Superfície
4.
Clin Oral Investig ; 26(6): 4549-4558, 2022 Jun.
Artigo em Inglês | MEDLINE | ID: mdl-35322316

RESUMO

OBJECTIVE: To compare the in vitro decontamination efficacy of two electrolytic cleaning methods to diode laser, plasma, and air-abrasive devices. MATERIAL AND METHODS: Sixty sandblasted large-grit acid-etched (SLA) implants were incubated with 2 ml of human saliva and Tryptic Soy Broth solution under continuous shaking for 14 days. Implants were then randomly assigned to one untreated control group (n = 10) and 5 different decontamination modalities: air-abrasive powder (n = 10), diode laser (n = 10), plasma cleaning (n = 10), and two electrolytic test protocols using either potassium iodide (KI) (n = 10) or sodium formate (CHNaO2) (n = 10) solution. Implants were stained for dead and alive bacteria in two standardized measurement areas, observed at fluorescent microscope, and analyzed for color intensity. RESULTS: All disinfecting treatment modalities significantly reduced the stained area compared to the untreated control group for both measurement areas (p < 0.001). Among test interventions, electrolytic KI and CHNaO2 treatments were equally effective, and each one significantly reduced the stained area compared to any other treatment modality (p < 0.001). Efficacy of electrolytic protocols was not affected by the angulation of examined surfaces [surface angulation 0° vs. 60° (staining %): electrolytic cleaning-KI 0.03 ± 0.04 vs. 0.09 ± 0.10; electrolytic cleaning-CHNaO2 0.01 ± 0.01 vs. 0.06 ± 0.08; (p > 0.05)], while air abrasion [surface angulation 0° vs. 60° (staining %): 2.66 ± 0.83 vs. 42.12 ± 3.46 (p < 0.001)] and plasma cleaning [surface angulation 0° vs. 60° (staining %): 33.25 ± 3.01 vs. 39.16 ± 3.15 (p < 0.001)] were. CONCLUSIONS: Within the limitations of the present in vitro study, electrolytic decontamination with KI and CHNaO2 was significantly more effective in reducing bacterial stained surface of rough titanium implants than air-abrasive powder, diode laser, and plasma cleaning, regardless of the accessibility of the contaminated implant location. CLINICAL RELEVANCE: Complete bacterial elimination (residual bacteria < 1%) was achieved only for the electrolytic cleaning approaches, irrespectively of the favorable or unfavorable access to implant surface.


Assuntos
Implantes Dentários , Peri-Implantite , Abrasão Dental por Ar/métodos , Descontaminação , Eletrólitos , Humanos , Lasers Semicondutores , Microscopia Eletrônica de Varredura , Peri-Implantite/terapia , Pós , Propriedades de Superfície , Titânio
5.
Int J Oral Maxillofac Implants ; 37(1): 76-84, 2022.
Artigo em Inglês | MEDLINE | ID: mdl-35235623

RESUMO

PURPOSE: To achieve high plaque removal around peri-implant tissues, noninvasive cleaning methods that guarantee the long-term success and survival of titanium implants should be established. This systematic review aimed to systematically evaluate in vitro investigations assessing different treatment modalities to decontaminate titanium surfaces, with special focus on the most effective cleaning procedures. MATERIALS AND METHODS: PRISMA guidelines were adopted in an electronic search conducted through MEDLINE, Scopus, and Google Scholar databases to identify studies on mechanical, chemical, or laser decontamination modalities up to November 2019. RESULTS: The search resulted in 326 articles; after removing duplicates and reading titles, abstracts, and full texts, 38 articles were ultimately processed for data extraction. Mechanical decontamination provided better results in comparison to laser and chemical procedures. Among mechanical modalities, air abrasion showed the best cleaning effectiveness. Conversely, upon comparison of the chemical methods, chlorhexidine demonstrated comparable results with all tested substances and even with photodynamic therapy. Among different lasers, the results showed that the diode was more promising compared with the other tested lasers. CONCLUSION: This review demonstrated that there is still no consensus on which technique performs better. However, mechanical decontamination yielded more favorable results than laser and chemical methods. This aspect would support the hypothesis that decontamination procedures adopted in a combination fashion, which includes mechanical procedures, may provide better clinical results than when used alone.


Assuntos
Implantes Dentários , Peri-Implantite , Abrasão Dental por Ar , Descontaminação/métodos , Humanos , Peri-Implantite/terapia , Propriedades de Superfície , Titânio
6.
J Oral Sci ; 64(2): 124-128, 2022 Apr 01.
Artigo em Inglês | MEDLINE | ID: mdl-35173098

RESUMO

PURPOSE: The aim of this study was to investigate the effect of nonthermal argon plasma (NP) surface treatment on the fracture resistance of monolithic zirconia restorations with different microstructures. METHODS: Twenty restorations were prepared from each of two tetragonal and two cubic zirconia materials (80 restorations in total). The restorations were then divided into two subgroups (n = 10) for each material according to the surface treatment applied: air abrasion or NP. The surface topography of the treated groups was examined using a scanning electron microscope. All restorations were fixed to metal dies with resin cement, subjected to thermal cycling, and then underwent fracture resistance testing with a universal testing device. Two-way ANOVA and Bonferroni tests were used for statistical analysis of the data (α = 0.05). RESULTS: The type of surface treatment and the type of zirconia material were shown to significantly affect the fracture resistance of the restorations. The air-abraded groups showed significantly higher fracture resistance (N) than the NP groups (P < 0.001). CONCLUSION: The results of this study suggest that air abrasion surface treatment has a more favorable effect on the fracture resistance of tetragonal and cubic zirconia restorations than NP surface treatment.


Assuntos
Gases em Plasma , Abrasão Dental por Ar , Argônio , Cerâmica/química , Análise do Estresse Dentário , Teste de Materiais , Gases em Plasma/uso terapêutico , Cimentos de Resina/química , Propriedades de Superfície , Zircônio/química
7.
Clin Oral Investig ; 26(4): 3547-3561, 2022 Apr.
Artigo em Inglês | MEDLINE | ID: mdl-34859327

RESUMO

OBJECTIVE: The aim of this study was to assess the influence of different silicatization protocols with various silane treatment methods on the bond performance to high-translucent zirconia. MATERIALS AND METHODS: High-translucent zirconia specimens were assigned to five groups according to mechanical surface pretreatment: as-sintered (Con), 0.2 MPa alumina sandblasting (AB2), tribochemical silica coating (TSC), 0.2 and 0.4 MPa glass bead air abrasion (GB2) and (GB4). Each group was subjected to 4 different cementation protocols: Panavia SA Universal (SAU), Panavia SA plus (SAP), silane + SAP (S-SAP), and Universal adhesive + SAP (U-SAP). Tensile bond strength (TBS) was measured after 24 h and 10,000 thermocycling (TC). Surface topography, surface energy, and elemental composition of the abraded zirconia surface analyses were completed. TBS data was analyzed using the Weibull analysis method. Surface roughness and surface energy were compared by one-way ANOVA analysis of variance (α = 0.05). RESULTS: After 24 h, higher TBS was achieved with all cementation protocols in AB2 and TSC, also, in GB2 with all protocols except U-SAP, and in GB4 with SAU and S-SAP. After aging, GB4/S-SAP, GB2/S-SAP, AB2/U-SAP, and TSC/S-SAP showed the highest bond strength. GB groups showed the lowest surface roughness and highest surface energy. CONCLUSION: Glass bead abrasion achieved the durable bond strength to high-translucent zirconia using a separate silane coupling agent while altered surface chemistry, surface energy, and roughness without effect on morphology. CLINICAL RELEVANCE: Glass bead air abrasion is an alternative to alumina sandblasting and tribochemical silica coating and improves bond strength to high translucent zirconia.


Assuntos
Colagem Dentária , Cimentos de Resina , Abrasão Dental por Ar , Óxido de Alumínio/química , Cerâmica , Colagem Dentária/métodos , Análise do Estresse Dentário , Teste de Materiais , Cimentos de Resina/química , Dióxido de Silício/química , Propriedades de Superfície , Zircônio/química
8.
Clin Oral Investig ; 26(3): 3251-3259, 2022 Mar.
Artigo em Inglês | MEDLINE | ID: mdl-34825281

RESUMO

OBJECTIVES: To develop and test the cutting efficiency of a novel degradable glass as an alternative media to alumina powder for air abrasion. MATERIALS AND METHODS: A zinc-based glass (QMZK2) was designed, produced, and evaluated with a multi-modality imaging analysis. The glass dissolution study was carried out in three acids, using ICP-OES (inductively coupled plasma optical emission spectroscopy) at 5 different time points: 2.5, 5, 10, 60, and 240 min. The cutting efficiency of both materials was tested under the same parameters on slabs of elephant enamel. A stained fissure of a molar tooth was air abraded with the glass and evaluated with X-ray micro-tomography before and after air abrasion. RESULTS: The particle size distribution of the glass was similar to that of alumina 53 µm but with a slightly greater dispersion of particle size. The shape of the particles was angular, appropriate for cutting purposes. The dissolution study showed that the glass dissolved rapidly in acidic conditions at all time points. Between the two variables, pressure and powder flow, pressure was found to influence the cutting speed to a greater extent than powder flow. CONCLUSIONS: Alumina powder was found to perform significantly better in 4 of the 9 conditions tested on elephant enamel, QMZK2 in one, and no significant differences were found for the rest of the 4 conditions. The QMZK2 seems to offer promising results as an alternative material to alumina. CLINICAL RELEVANCE: QMZK2 glass has the potential for replacing aluminum oxide as a degradable material in air abrasion technology.


Assuntos
Abrasão Dental por Ar , Esmalte Dentário , Abrasão Dental por Ar/métodos , Óxido de Alumínio/química , Cerâmica/química , Vidro/química , Teste de Materiais , Pós , Propriedades de Superfície
9.
Braz. j. oral sci ; 20: e211670, jan.-dez. 2021. ilus
Artigo em Inglês | LILACS, BBO - Odontologia | ID: biblio-1254259

RESUMO

Aim: To evaluate the effect of different surface treatments and adhesive approaches on the microshear bond strength of resin cement to a polymer-infiltrated ceramic network (PICN). Methods: PICN blocks were randomly assigned into 9 groups (n=10): CTRL: no treatment; HF: 5% hydrofluoric acid etching; HF-S: HF + silane; HF-S-A: HF-S + adhesive (Adper Single Bond 2); HF-UA: HF + universal adhesive (Single Bond Universal); SB: sandblasting with 50 µm Al2O3 particles; SB-S: SB + silane; SB-S-A: SB-S + adhesive; SB-UA: SB + universal adhesive. Resin cement microcylinders (Ø = 0.96 mm; height = 1 mm) (RelyX Ultimate) were built upon the PICN surface after roughness and contact angle measurements. Next, microshear bonding tests (µSBS) were performed (0.5 mm/min) after water storage (37ºC, 90 days) and thermocycling (12,000 cycles; 5ºC-55ºC). Failure modes were observed under stereomicroscope. Bond strength data were analyzed by two-way ANOVA/Tukey's test and t-tests. Kruskal-Wallis/Dunn's tests were conducted for roughness and contact angle data (α = 0.05). Results: A rougher surface and lower contact angles were observed for Sandblasting. HF-S (18.54 ± 2.03 MPa), SB-S (19.00 ± 1.66 MPa) and SB-UA (18.07 ± 2.36 MPa) provided the highest bond strength values, followed by the other treated groups. The CTRL group resulted in lower bond strength (7.18 ± 2.34 MPa). Conclusion: Hydrofluoric acid etching followed by silane application and sandblasting followed by silane or universal adhesive are useful clinical steps to enhance bonding to PICN. Adhesive applications after HF etching have no advantages in bonding to PICN


Assuntos
Propriedades de Superfície , Cerâmica , Adesivos Dentinários , Cimentos de Resina , Abrasão Dental por Ar , Ácido Fluorídrico
10.
Gen Dent ; 69(6): 34-40, 2021.
Artigo em Inglês | MEDLINE | ID: mdl-34678740

RESUMO

The objective of this study was to evaluate the effects of different surface treatments on the microshear bond strength (µSBS) of resin cements to zirconia. Twenty-four zirconia wafers measuring 2.0 × 9.0 × 15.0 mm were sintered and randomly distributed into 3 groups based on the resin cement (n = 8): Panavia F 2.0, NX3, and RelyX Ultimate. The resin cement groups were divided into 4 subgroups based on the surface treatment: a control subgroup (air abrasion with 50-µm alumina particles) and 3 experimental surface treatments (Alloy Primer, Ea-Z-y Primer, and tribochemical silicoating using CoJet Sand). Each surface treatment was applied to the zirconia wafers according to its manufacturer's instructions. The resin cements were mixed and placed in thermoplastic tubes, producing cylinders measuring 0.8 mm in diameter × 2.0 mm in height. Five tubes containing the resin cements were placed on each of the pretreated zirconia wafers, resulting in a sample size of 10 specimens per treatment per resin cement. The luting agents were allowed to cure chemically for 4 minutes and then light cured for 30 seconds. The thermoplastic tubes were removed after 24 hours, and specimens were stored in deionized water (37°C) for 24 hours. A shear force was applied using a wire loop attached to a universal testing machine with a crosshead speed of 0.5 mm/min, and the microshear forces required for failure were recorded. The parametric data were analyzed with a 2-way analysis of variance with post hoc Tukey and Dunnett tests (P < 0.05). The mean (SD) µSBS values ranged from 3.6 (0.9) to 9.3 (2.4) MPa. Surface treatment with Alloy Primer and Ea-Z-y Primer increased the µSBS of the 3 cements compared to their controls, but the difference was not always statistically significant. CoJet Sand only increased the µSBS of Panavia F 2.0. The results suggest that the effects of different surface treatments may be specific for each cement.


Assuntos
Colagem Dentária , Cimentos de Resina , Abrasão Dental por Ar , Cimentos Dentários , Análise do Estresse Dentário , Humanos , Teste de Materiais , Resistência ao Cisalhamento , Propriedades de Superfície , Zircônio
11.
Dent Mater ; 37(12): e523-e532, 2021 12.
Artigo em Inglês | MEDLINE | ID: mdl-34702558

RESUMO

OBJECTIVE: To evaluate the volume loss after air abrasion with alumina particles with different morphology on bovine enamel and luting composite resin. METHODS: Air abrasion was performed on 12 unscathed bovine teeth and 72 luting composite resin discs with 85 µm round-shaped and 50 µm sharp-edged alumina particles applied for 20 s, 40 s and 60 s (n = 12). Air abrasion was standardized by uniform areas of 2 mm diameter, a pressure of 0.25 MPa and a distance of 3 mm. The volume loss was determined by using a laboratory scanner. RESULTS: Air abrasion with round-shaped alumina particles was mostly not measurable with the laboratory scanner, while sharp-edged alumina air abrasion resulted in significant loss of enamel. The median of volume loss by sharp-edged alumina particles ranged from 0.78 mm3 (20 s) to 2.52 mm3 (60 s). In contrast to round-shaped alumina the removal caused by sharp-edged alumina increased significantly with increasing application times (p ≤ 0.05). For air abrasion on luting composite resin the median of the removed volume ranged from 2.25 mm3 (20 s) to 6.18 mm3 (60 s), while round-shaped alumina showed a range from 0.45 mm3 (20 s) to 1.40mm3 (60 s). The round-shaped alumina produced a statistically significant lower volume loss than sharp-edged alumina for all three air abrasion times. SIGNIFICANCE: The 85 µm round-shaped alumina particles removed less composite resin than 50 µm sharp-edged alumina particles but barely any enamel, making it an option for removing composite resin residues from enamel.


Assuntos
Resinas Compostas , Colagem Dentária , Abrasão Dental por Ar , Óxido de Alumínio , Animais , Bovinos , Esmalte Dentário , Teste de Materiais , Cimentos de Resina , Propriedades de Superfície
12.
J Adhes Dent ; 23(4): 319-326, 2021 Jul 23.
Artigo em Inglês | MEDLINE | ID: mdl-34269542

RESUMO

PURPOSE: To compare the effect of different methods of cleaning residual composite cement from the surface of lithium-disilicate glass-ceramic on its bond strength. MATERIALS AND METHODS: Blocks of lithium-silicate glass-ceramic (e.max CAD) were coated with composite cement. Blocks in a positive control (CO+) group received no cement; negative controls (CO-) received composite cement. After water storage (24 h), specimens were cleaned as follows (n = 20/group): BUR: grinding with a fine-grit diamond bur (20 s); ALUM: air abrasion with 50-µm alumina (10 s); GLASS: air abrasion with 50-µm glass beads (10 s); FURN: firing in ceramic furnace and cleaning with ethanol; SULF: immersion in sulfonic acid solution (1 h); HYFL: no additional treatment. All specimens were etched with hydrofluoric acid, aside from the CO- group, and treated with silane. A 1.5-mm diameter cement-filled tube was affixed to the specimens and light polymerized. Specimens were stored in 37°C water for 24 h (n = 10) or 90 days (n = 10). Shear bond strength was tested. Two-way ANOVA and post-hoc Tukey tests were performed. Specimens from each group were examined with SEM. RESULTS: Bond strength significantly differed according to surface cleaning method (p < 0.01) and storage time (p < 0.01), but their interaction was not significant (p = 0.264). Longer storage time decreased the bond strength. BUR, ALUM, GLASS, and FURN did not differ statistically significantly from CO+, but were significantly greater than CO-. SULF and HYFL did not differ statistically significantly from CO- and were significantly lower than CO+. CONCLUSIONS: Cleaning composite cement with BUR, ALUM, GLASS, and FURN restored bond strengths to that of the positive control. However, only GLASS and FURN did not roughen the surface of the underlying lithium-silicate glass-ceramic.


Assuntos
Colagem Dentária , Cimentos de Resina , Abrasão Dental por Ar , Cerâmica , Porcelana Dentária , Lítio , Teste de Materiais , Propriedades de Superfície
13.
J Adhes Dent ; 23(2): 145-158, 2021 Apr 07.
Artigo em Inglês | MEDLINE | ID: mdl-33825428

RESUMO

PURPOSE: To investigate the impact of pretreatment and conditioning on shear bond strength (SBS), surface free energy (SFE) and surface roughness (SR) between polyetheretherketone (PEEK) and cold-cured polymethylmethacrylate (PMMA). MATERIALS AND METHODS: PEEK substrates (Dentokeep PEEK Disc, nt-trading) were air abraded with Al2O3 particles of different grain sizes applied with varying pressure at 1) 0.2 MPa - 50 µm Al2O3; 2) 0.4 MPa - 50 µm Al2O3; 3) 0.2 MPa - 110 µm Al2O3; 4) 0.4 MPa - 110 µm Al2O3; or 5) without air abrasion (n = 172/group). Surface properties were quantified using SFE and SR (n = 10/group), and scanning electron microscope imaging (n = 2/group). Substrates were conditioned with a) Visio.link (VL, Bredent); b) Scotchbond Universal (SU, 3M Oral Care); c) Bonding Fluid (BF, Schütz Dental); or d) without conditioning (WC; n = 40/subgroup) and bonded to the polymer (Futura Jet, Schütz Dental). SBS and fracture types were determined before and after 10,000 thermal cycles (n = 20/subgroup). Univariate ANOVA, Kruskal-Wallis test, Mann-Whitney U-test, Kaplan-Meier survival estimates, and Weibull distribution were computed (p < 0.05). Ciba-Geigy tables and the chi-squared test were used to analyze fracture type distributions. RESULTS: An increase in particle size and pressure resulted in similar or increased SBS, Weibull characteristic strength, and Weibull moduli (p < 0.001 - 0.046). The lowest results were observed for the control group (without air abrasion), while pretreatment with 0.4 MPa - 110 µm Al2O3 presented the highest values (p < 0.001). In comparison with the other conditioning procedures, VL showed high (p < 0.001 - 0.03), and SU and WC low SBS (p < 0.001 - 0.006). Although it did not influence SFE, an increase in particle size and pressure led to an increased SR (p < 0.001). CONCLUSION: Pretreatment with 0.4 MPa - 110 µm Al2O3 can be recommended to increase bonding properties between PEEK and PMMA. Application of adhesives such as VL can enhance SBS further.


Assuntos
Colagem Dentária , Polimetil Metacrilato , Abrasão Dental por Ar , Benzofenonas , Análise do Estresse Dentário , Dentaduras , Cetonas , Teste de Materiais , Polietilenoglicóis , Polímeros , Cimentos de Resina , Resistência ao Cisalhamento , Propriedades de Superfície
14.
Clin Oral Investig ; 25(12): 6633-6642, 2021 Dec.
Artigo em Inglês | MEDLINE | ID: mdl-33893556

RESUMO

OBJECTIVE: Treatment of implants with peri-implantitis is often unsuccessful due to residual microbial biofilm hindering re-osseointegration. The aim of this study was to treat biofilm-grown titanium (Ti) implants with different modalities involving air abrasion (AA) and cold atmospheric plasma (CAP) to compare the effectiveness in surface decontamination and the alteration/preservation of surface topography. MATERIALS AND METHODS: Saliva collected from a peri-implantitis patient was used to in vitro develop human biofilm over 35 implants with moderately rough surface. The implants were then mounted onto standardized acrylic blocks simulating peri-implantitis defects and treated with AA (erythritol powder), CAP in a liquid medium, or a combination (COM) of both modalities. The remaining biofilm was measured by crystal violet (CV). Surface features and roughness before and after treatment were assessed by scanning electron microscope (SEM). The data were statistically analyzed using Kruskal-Wallis followed by Tukey's multiple comparison test. RESULTS: In the present peri-implantitis model, the human complex biofilm growth was successful as indicated by the statistical significance between the negative and positive controls. All the treatment groups resulted in a remarkable implant surface decontamination, with values very close to the negative control for AA and COM. Indeed, statistically significant differences in the comparison between the positive control vs. all the treatment groups were found. SEM analysis showed no post-treatment alterations on the implant surface in all the groups. CONCLUSIONS: Decontamination with AA delivering erythritol with or without CAP in liquid medium demonstrated compelling efficacy in the removal of biofilm from implants. All the tested treatments did not cause qualitative alterations to the Ti surface features. No specific effects of the CAP were observed, although further studies are necessary to assess its potential as monotherapy with different settings or in combination with other decontamination procedures. CLINICAL RELEVANCE: CAP is a promising option in the treatment of peri-implantitis because it has potential to improve the elimination of bacterial plaque from implant surfaces, in inaccessible pockets or during open-flap debridement, and should stimulate the process of the re-osseointegration of affected dental implants by not altering surface features and roughness.


Assuntos
Implantes Dentários , Peri-Implantite , Gases em Plasma , Abrasão Dental por Ar , Biofilmes , Humanos , Peri-Implantite/terapia , Propriedades de Superfície , Titânio
15.
J Nanosci Nanotechnol ; 21(9): 4959-4963, 2021 09 01.
Artigo em Inglês | MEDLINE | ID: mdl-33691899

RESUMO

Self-assembled nano-layering resulting from combined ionic and hydrogen-bonding interactions of phosphate functional monomers with zirconia have been proposed. The purpose of this study was to investigate the bond strengths of two phosphate monomer-containing adhesive resin cements (Panavia F 2.0 and RelyX U200) to a conventional tetragonal zirconia (Lava Plus, LP) and a new cubic zirconia (Lava Esthetic, LE), with three different shade zones, after air-abrasion. The structures of the zirconia surfaces were examined with scanning electron microscopy (SEM) and X-ray diffractometry (XRD). Vickers hardness and fracture toughness of the surfaces were also evaluated using a hardness tester. After air-abrasion (with 50 µm Al2O3 at a pressure of 0.25 MPa), the surface roughness was measured using confocal laser scanning microscopy (CLSM) and the resin cements were bonded (diameter: 2.38 mm) to the surfaces. All bonded specimens were stored in water at 37 °C for 24 h before performing the shear bond strength (SBS) test (n = 15). In the SEM images, the LP group showed a finer grain size than the LE groups. The XRD patterns confirmed that LP and LE had tetragonal and cubic phases, respectively. Although there were no significant differences in Vickers hardness among the four groups (p = 0.117), the three LE groups revealed inferior fracture toughness to the LP group (p < 0.001). However, neither the surface roughness of the air-abraded zirconia surfaces nor SBS values of each resin cement bonded to them were significantly different (p > 0.05). In conclusion, no significant difference in SBS value was detected between the tetragonal and cubic zirconia within each resin cement used, probably due to the similar surface roughness of the air-abraded zirconia ceramics.


Assuntos
Abrasão Dental por Ar , Colagem Dentária , Cerâmica , Teste de Materiais , Resistência ao Cisalhamento , Propriedades de Superfície , Zircônio
16.
Dent Mater ; 37(3): 464-476, 2021 03.
Artigo em Inglês | MEDLINE | ID: mdl-33451690

RESUMO

OBJECTIVES: The aim of this study was to identify the relative strengths and weaknesses of different interfaces within the multilayer structure of a zirconia crown restoration when applying different surface pretreatments. These include the influence on shear strengths of different air abrasion protocols, glaze-on techniques, zirconia primers and self-adhesive cements for either the complex structure: zirconia / self adhesive resin composite cement (RCC) / bovine dentin substrate (part 1) or the RCC / zirconia substrate (part 2). METHODS: In Part 1, zirconia discs, pretreated by either glaze-on techniques or air abrasion using Rocatec™ Soft, were bonded to bovine dentin substrates with different self-adhesive RCCs. In Part 2, steel-cylinders were bonded to zirconia cuboid substrates, pretreated by either different protocols for air-abrasion or a glaze-on-technique, with different self-adhesive RCCs. Shear bond strengths (SBS) were measured for all interfacial combinations. RESULTS: In part 1, application of air abrasion using Rocatec™ Soft significantly increased the SBS of zirconia to dentin compared to control specimens without pretreatment, while glaze-on techniques did not increase the SBS. Pretreatment of zirconia surfaces with two primers (either Clearfil Ceramic Primer, or Monobond S) showed significantly higher SBS than the controls. Cementations with RelyX Unicem 2 Automix showed significantly higher SBS than with MaxCem Elite. In Part 2, all air abrasion protocols increased the SBS, but there was no significant difference between these protocols. Again the glaze-on technique did not increase SBS. A significant difference between the two RCCs was again observed. When zirconia substrates were air abraded, regardless of which protocol was applied, the highest SBS were obtained by Calibra with P&B active followed by Panavia with or without Clearfil Ceramic Primer Plus. Calibra applied without P&B active exhibited the lowest SBS. SIGNIFICANCE: Pretreatment of zirconia substrates using air abrasion and/or ceramic primers increased the SBS of the zirconia cement interface. For all tested glaze-on treatments, in our experimental setting no effect was observed.


Assuntos
Abrasão Dental por Ar , Colagem Dentária , Animais , Bovinos , Análise do Estresse Dentário , Dentina , Teste de Materiais , Cimentos de Resina , Resistência ao Cisalhamento , Propriedades de Superfície , Zircônio
17.
Dent Mater ; 37(2): 359-369, 2021 02.
Artigo em Inglês | MEDLINE | ID: mdl-33358017

RESUMO

OBJECTIVES: The aim of the present study was to assess the decontamination efficacy and titanium surface alterations of erythritol based air abrasion (AA) and cold atmospheric plasma (CAP) targeting a human complex biofilm. METHODS: Saliva collected from a peri-implantitis patient was used to develop in vitro human biofilm over titanium discs with machined (group A) and moderately rough (group B) surface. The discs were treated with AA, experimental CAP or a combination of both treatments (COM). The amount of biofilm on the discs was measured by crystal violet (CV). Surface features and roughness before and after treatment were assessed by SEM and laser profilometry, respectively. The data were statistically analyzed using Kruskal Wallis followed by Dunn's multiple comparison test after being checked for normality by Shapiro-Wilk test. RESULTS: All the discs in group A performed better to treatments compared to group B. In both groups, CV data showed significantly lower amount of biofilm after AA treatment compared to CAP (p<0.05). Cleaning efficacy revealed relevant decontamination of both the surfaces following AA and COM treatments and almost complete biofilm removal after AA application on group A (99.92%). SEM analysis demonstrated no post-treatment alterations on the discs and laser profilometry did not show statistically significant changes in Sa and Sdr values. SIGNIFICANCE: Decontamination with AA delivering erythritol with or without CAP is highly effective in biofilm removal from different titanium surfaces. All the tested treatments, including CAP showed no noticeable alterations of the titanium discs surface features. Further in vivo studies are necessary to understand the potential of CAP technology in implant surface decontamination.


Assuntos
Implantes Dentários , Gases em Plasma , Abrasão Dental por Ar , Biofilmes , Humanos , Microscopia Eletrônica de Varredura , Plasma , Propriedades de Superfície , Titânio
18.
J Biomed Mater Res B Appl Biomater ; 109(4): 596-605, 2021 04.
Artigo em Inglês | MEDLINE | ID: mdl-33073447

RESUMO

This study aimed to investigate the effects of femtosecond laser (Fs) and/or air-abrasion protocols on surface roughness (Ra) of zirconia and resin bond strength. Eighty zirconia samples were randomly divided into eight subgroups according to surface treatment protocols: Control (C), Air-abrasion before sintering (ABS), Air-abrasion after sintering (AAS), Air-abrasion before and after sintering (ABS + AAS), Fs laser before sintering (FBS), Fs laser before sintering + air-abrasion after sintering (FBS + AAS), Fs laser after sintering (FAS), and Fs laser after sintering + air-abrasion after sintering (FAS + AAS). Measurements of Ra values were obtained using a surface profilometer. Surface morphological properties were evaluated with scanning electron microscopy (SEM), and crystallographic changes were examined by X-Ray diffractometry (XRD). Self-adhesive resin cement was bonded to zirconia samples, and shear bond strength (SBS) tests were performed. The data were statistically analyzed by one-way ANOVA, followed by Tamhane tests. The control group displayed the lowest Ra and SBS values among all groups. The highest Ra and SBS values were found in the FBS and FBS + AAS groups. Air-abrasion applied before sintering significantly increased the Ra of specimens. FAS, FAS + AAS, and ABS + AAS groups exhibited higher SBS values than AAS and ABS (p < .05). Air-abrasion applied after Fs laser did not produce any significant change in the Ra and SBS compared to Fs laser alone (p > .05). Femtosecond laser application may be a promising method to enhance the surface roughness of zirconia and improve resin bond strength. Air-abrasion at pre- and post-sintered stages may also be a viable surface treatment option.


Assuntos
Abrasão Dental por Ar/métodos , Cimentos Dentários/química , Materiais Dentários , Zircônio , Ar , Colagem Dentária , Materiais Dentários/química , Temperatura Alta , Lasers , Teste de Materiais , Microscopia Eletrônica , Pressão , Cimentos de Resina/química , Resistência ao Cisalhamento , Propriedades de Superfície , Difração de Raios X , Zircônio/química
19.
J Biomed Mater Res B Appl Biomater ; 109(4): 606-616, 2021 04.
Artigo em Inglês | MEDLINE | ID: mdl-33236475

RESUMO

This study aimed to evaluate the effect of air-abrasion/sintering order and autoclave aging on the surface roughness (Ra), phase transformation, and biaxial flexural strength (BFS) of monolithic zirconia. A total of 104 monolithic zirconia specimens (Katana ML) were divided into eight groups according to airborne-particle abrasion protocols and hydrothermal aging: control (non-aged: C-, aged: C+), air-abrasion before sintering (BS-, BS+), air-abrasion after sintering (AS-, AS+), and air-abrasion before and after sintering (BAS-, BAS+). A steam autoclave was used for accelerated aging, and Ra values were measured with a surface profilometer. All specimens were analyzed by X-ray diffraction to determine any phase transformation on the zirconia surface. BFS was measured by using the piston-on-three-balls method. Scanning electron microscopy and atomic force microscopy were performed on one specimen per group. BS and BAS groups showed higher Ra values compared with groups C and AS. The aging process significantly increased the monoclinic phase content of all specimens. Lower monoclinic levels were found in AS+ and BAS+ compared with other aged groups. The AS groups exhibited higher flexural strength values relative to control groups, whereas BS groups exhibited significantly lower flexural strength values (p < .05). There was no reduction in flexural strength by using the BAS protocol. Air-abrasion of zirconia at the pre-sintered stage only is not recommended in clinical use because of the remarkable decrease in flexural strength.


Assuntos
Abrasão Dental por Ar/métodos , Cimentos Dentários/química , Materiais Dentários , Zircônio , Colagem Dentária , Materiais Dentários/química , Temperatura Alta , Teste de Materiais , Microscopia Eletrônica , Pressão , Cimentos de Resina/química , Resistência ao Cisalhamento , Propriedades de Superfície , Difração de Raios X , Zircônio/química
20.
Dent Mater ; 37(4): e195-e200, 2021 04.
Artigo em Inglês | MEDLINE | ID: mdl-33334585

RESUMO

OBJECTIVES: This survey evaluated dentists' use of adhesive bonding methods of all-ceramic restorations over a period of twelve years. This is a follow-up survey which had been undertaken in 2007, 2011, and in 2015 [1]. METHODS: A multiple choice questionnaire regarding adhesive bonding methods for all-ceramic restoration was developed and handed out in 2007 and 2019 to dentist participating in a local annual dental meeting in Northern Germany. The questionnaires were evaluated on the basis of evidence-based techniques from the scientific literature. RESULTS: Data from 93 questionnaires (2019) were compared with 90 evaluated questionnaires from 2007. Bonding of oxide ceramic had improved over the years of observation (7% to 62%) whereas evidence-based bonding of silicate ceramic restorations decreased from 66% to 38%; common mistakes were using air abrasion on silicate surface. Females showed better values for correct adhesive cementation than males (f: 39-50%, m: 22%-41%). A correlation between correct cementation and years of professional experience could not be revealed. CONCLUSION: Incorrect bonding of oxide ceramic restorations decreased within the 12 years investigated whereas there was no improvement of evidence-based bonding procedures of silicate ceramics. Still a high number of survey participants need additional training in bonding techniques.


Assuntos
Colagem Dentária , Cimentos de Resina , Abrasão Dental por Ar , Cerâmica , Cimentos Dentários , Porcelana Dentária , Seguimentos , Propriedades de Superfície , Inquéritos e Questionários
SELEÇÃO DE REFERÊNCIAS
DETALHE DA PESQUISA
...