No full-text available
To read the full-text of this research,
you can request a copy directly from the authors.
Avaliação da resistência adesiva entre uma cerâmica reforçada por leucita e dois cimentos resinosos
Abstract
O presente estudo avaliou a resistência da união entre a superfície da cerâmica VITA OMEGA 900? (VITA) e dois cimentos resinosos Foram confeccionados quatorze blocos da cerâmica com dimensões de 6mm x 6mm x 5mm (recomendações do fabricante), os quais foram duplicados em resina composta (W3D MASTER, Wilcos, Brasil). Uma das faces de cada bloco cerâmico (6mm x 5mm) foi tratada com ácido fluorídrico a 10% (Dentsply) e cimentada comdois diferentes cimentos resinosos: Panavia F? (Kuraray) and Rely X? (3M/ESPE) sob carga constante de 750g, à face do bloco de resina composta correspondente. Os conjuntos cerâmica-cimento-resina composta foram divididos em.dois grupos (n=7): grupo do Panavia F e grupo do Rely X. Cada conjunto foi cortado e foram obtidas oito amostra por conjunto. Cada uma foi fixada com cianoacrilato em um paquímetro adaptado e acoplado em máquina de ensaios universal (EMIC) com velocidade de 0,5mm/min. Os dados (MPa) foram submetidos ao teste estatístico paramétrico ” t ” de amostras independentes cujos resultados indicaram que o grupo do Panavia F (média = 16,07 MPa ; dp = 3,61) nãodiferiu estatisticamente (t= 1,27; gl=12; p-valor = 0,228) do grupo do RelyX (média = 13, 71 ; dp = 3.33) ao nível de significância de 5%. De acordo com os resultados obtidos foi possível concluir que os dois cimentos resinosos usadosnesse estudo foram eficientes para cimentação intra-oral.
ResearchGate has not been able to resolve any citations for this publication.
The present study evaluated the union resistance among the surface of the ceramic Procera All Ceram® (NOBEL BIOCARE) and two different types of resin cements (Panavia F, Kuraray® e Relyx, 3M®).Two ceramic blocks were made with dimensions of 6x6x5mm following the technical guide lines wich were duplicated in composite resin (W3D MASTER®). One of the faces of the ceramic block (6mmx5mm) was sandblasted with the Rocatec system® and cemented with the two different cements under constant load of 750g to the correspondents faces composite blocks. After the storage of the samples (seven days in distilled water at 37º) each group formed by ceramic, cement and resin was split up in two axis X and Y and it were obtained specimens with adehive area of 1 mm² ± 0,1. Two groups (n=27) were obtained: PanaviaF group and RelyX group. Each sample was fixed with cyanocrylate in an adapted device which was attached to a universal testing machine (EMIC) and then subjected to tensile forces at a crosshead of 0,5 mm/min and load cell of 10kgf. The results showed that the medium values of rupture (MPa) for the PanaviaF group (median=17,011 ± standart deviation=4,131) are statistically different comparing to RelyX group (median 10,071 ± standart deviation 3,550) (p-value=0,001). The conclusion of this study was that the Panavia F had better adhesive resistance than RelyX. All fractures analyzed occurred at the adhesive interface, with no findings of cohesive fracture of the porcelain.
The relative contribution of the matrix of dentin to the physical properties of dentin is unknown but thought to be small. The objective of this study was to test the hypothesis that the demineralized matrix of dentin contributes little to the strength of dentin by measuring and comparing the ultimate tensile strength and modulus of elasticity of mineralized and demineralized dentin. Small slabs (4 x 0.5 x 0.5 mm) of bovine and human dentin were tested in a microtensile testing device in vitro. Human coronal mineralized dentin gave a mean ultimate tensile strength (UTS) of 104 MPa. Bovine incisor coronal dentin exhibited a UTS of 91 MPa, and bovine root dentin failed at 129 MPa. The modulus of elasticity of mineralized bovine and human dentin varied from 13 to 15 MPa. When dentin specimens were demineralized in EDTA, the UTS and modulus of elasticity fell to 26-32 MPa and 0.25 GPa, respectively, depending on dentin species. The results indicate that collagen contributes about 30% of the UTS of mineralized dentin, which is higher than was expected.
Increasing patient expectations regarding the appearance of restorations continue to test the ingenuity and skill of the dental team. To this end the quest for sufficiently strong, metal-free, all-ceramic restorations to function in all areas of the mouth continues apace. We report on a possible solution to this problem that uses computer-aided design/computer-aided milling (CAD/CAM) technology coupled with a novel, densely sintered, ceramic material. In this article we offer suggestions for case selection, preparation design, and luting procedures, and in addition illustrate these with a number of completed cases.
The publication of dentin bond strength data is prolific in the dental literature and will remain so as more and more new dentin bonding agents are marketed. It is the purpose of this presentation to assess the usefulness of this information.
The limitations of dentin bond strength tests are examined in the context of current knowledge about the methods used.
The evidence provided shows that dentin bond strength measurement techniques provide data that is not able to act as a consistent predictor of clinical performance. Fundamental flaws in the most popular methods adopted have been identified and alternative approaches need to be explored. Unfortunately, we do not as yet have in place methodologies that allow us to establish a reliable link between laboratory bond strength data and clinical performance.
For the present, clinically based evidence remains the only reliable means for the selection of dentin bonding agents.
The effectiveness of 4-methacryloxyethyl trimellitate anhydride (4-META) on the adhesion of an acrylic rod with etched dentine and enamel was studied. Etching of tooth substrates with a 10% citric acid-3% ferric chloride solution prior to the adhesion proved effective. Monomers with both hydrophobic and hydrophilic groups like 4-META promoted the infiltration of monomers into the hard tissue. The infiltrated monomers polymerized in situ and good adhesion with the tooth substrates took place. The tensile adhesive strength was 18 MPa on the etched dentine. Scanning electron microscopic studies suggested that the monomers possess affinity with the hard tissue. The good adhesion was not provided by the interlocking at the tubules as had been considered previously.
Adhesion testing of dentin bonding agents was reviewed starting with the adhesion substrate, dentin, the variables involved in etching, priming and bonding, storage variables and testing variables. Several recent reports attempting to standardize many of these variables were discussed. Recent advances in the development of new bonding systems have resulted in bond strengths on the order of 20–30 MPa. At these high bond strengths, most of the bond failure modes have been cohesive in dentin. As this precludes measurement of interfacial bond strength, new testing methods must be developed. One such new method, a microtensile method, was described along with preliminary results that have been obtained.The last decade has produced major advances in dentin bonding. The next decade should prove to be even more exciting.
Procera Sandvik AB is now manufacturing a densely sintered high-purity alumina core for an all-ceramic crown designed for anterior and posterior restorations. Whereas the material holds promise on the basis of in vitro strength tests, the ability to alter the surface and use conventional bonded resin cements has not been reported previously in the literature. Samples of the core were treated by means of one of four methods routinely used for all ceramic restorations, and then a commercially available resin cement was bonded to the surface. A shear bond test of the adhesion showed that the highest shear bond strengths of 11.99 +/- 3.12 MPa were obtained with air abrasion at 80 psi and 50-microm alumina particles.
Tese (Doutorado)--Faculdade de Odontologia da Universidade de São Paulo.
Friction coefficients for a variety of material couples are reported. The relative abrasive wear of materials followed the order of their hardness, with one exception.
Resin bonding to a glass-infiltrated aluminum oxide ceramic (In-Ceram) cannot be achieved by the methods commonly used for conventional silica-based dental ceramics. This study evaluated the durability of alternative methods of adhesive bonding to In-Ceram ceramic. The tensile bond strength of six bonding systems to In-Ceram ceramic was tested after up to 150 days of storage in isotonic artificial saliva solution and thermal cycling. Sandblasting alone or additional use of a silane did not result in a durable bond of a conventional BIS-GMA composite resin to In-Ceram ceramic. A durable bond to In-Ceram ceramic was achieved with a combination of tribochemical silica coating and conventional BIS-GMA composite resin or with the combination of sandblasting and a composite resin modified with a phosphate monomer. These two chemomechanical bonding methods appeared suitable for clinical bonding of In-Ceram ceramic restorations. A delayed degradation in bond strength was recorded for the combination of thermal silica coating and a conventional BIS-GMA composite resin; no reduction was found after 30 days, but there was a pronounced decrease after 150 days. This degradation indicated that extended storage in a wet environment was needed in laboratory tests to evaluate the durability of chemical bonds.
In vitro tensile bond strengths of composite to porcelain treated by acid etching or sandblasting were measured. A 9.5% HF gel was applied for 30, 60, 150, or 300 seconds at 23 degrees C. Al2O3 particles were applied as wet-10.2, dry-33.5, dry-48.0, or dry-78.0 microns. Average roughness (Ra) was measured by profilometry before and after each treatment. Both longer etching time and sandblasting using Al2O3 with larger particle sizes produced increased surface roughness of porcelain. Etching with 9.5% hydrofluoric acid gel produced higher bond strengths than sandblasting with a series of Al2O3 particles. Etching longer than 60 seconds produced increased cohesive failures in porcelain, whereas most failures observed with sandblasted surfaces were adhesive.
This study evaluated the effect of various ceramic surface treatments on the shear bond strengths of four resin luting agents to Cerec 2 ceramic material.
Four ceramic surface treatments were performed. All groups were subjected to the control treatment, which was abrasion with No. 600 silicon carbide paper. The other three group treatments were etching with phosphoric acid gel, application of bonding agent containing silane coupler, and application of silane coupling agent after etching with phosphoric acid gel. Cerec 2 ceramic specimens were treated with one of the four methods and then cemented together with each of the four resin luting agents (Super-Bond C&B, Panavia 21, Clapearl, and Vita Cerec Duo Cement). Half of the specimens were stored in water and the other half were thermal cycled before shear bond strength testing.
Treatment with the silane coupler improved the shear bond strength compared only with the abrasion with carbide paper (control). When the ceramic material was treated with the silane coupler or the silane coupling agent after etching with phosphoric acid gel, no significant differences in bond strength were noted between water storage and 20,000 thermal cycles for any of the four resin luting agents. After 20,000 thermal cycles, all specimens treated with the silane coupling agent with phosphoric acid gel except those cemented with Super-Bond C&B resin luting agent after etching showed cohesive failures within the ceramic.
Combined surface treatment of etching with phosphoric acid and application of silane coupling agent provides the highest bond strengths of resin luting agents to Cerec 2 ceramic material after thermal cycling.
The aim of this study was to determine bond strength between dentin and three adhesive systems, by means of microtensile, shear and tensile tests.
Extracted human molars were embedded in acrylic resin and had the dentin exposed on three of their smooth surfaces. On each surface a specimen was prepared to be submitted to either micro-tensile, shear or tensile bond strength testing. For shear and tensile tests, after adhesive application, a cone 3 mm high and diameter of 3 mm in the small surface was built with composite resin. The shear test was performed with a chisel. Tensile testing was made by pulling the resin cone via a metallic clamp. For micro-tensile testing, composite approximately 5 mm high was placed over the entire exposed dentin. Then, using a diamond disk perpendicular to the bonding interface, 'sticks' with 0.25 mm2 rectangular cross-sectional area were obtained and subjected to tensile force.
All tests ranked the adhesives in the same order. Mean values obtained by the micro-tensile test were not statistically different. For shear and tensile tests, Single Bond gave higher bond strength than Etch & Prime 3.0 (p < 0.05). Scotchbond Multi-Purpose Plus originated bondings that were statistically similar to both Single Bond and Etch & Prime 3.0. Comparing the three tests, a higher mean (p < 0.05) and a smaller coefficient of variation were found with the micro-tensile test.
The one-bottle adhesive system obtained higher bond strength values than the self-etching adhesive upon shear and tensile strength tests. Depending on the test applied, differences among materials may not be disclosed.
In a previous article the authors examined the evolution of the bond strengths of 2 dental feldspathic ceramics. The objective of the present study was to evaluate the effect of surface modifications with hydrofluoric acid gel (concentration 10%) on the surface energy of 2 dental feldspathic ceramics (GC and PVS).
For an energy characterization, 30 samples of GC and 30 samples of PVS were built. This study comprised the measurement of contact angles to determine the work of adhesion (WA) of the 2 ceramics. The evolution of the work of adhesion depended on the action of the hydrofluoric acid gel on the roughness of the surface of the 2 ceramics.
In a polished state PVS presented a higher work of adhesion than GC. Etching the ceramics with hydrofluoric acid gel increased the work of adhesion, especially for GC, but this treatment was not sufficient to obtain a high work of adhesion.
Etching with hydrofluoric acid gel was not sufficient to raise the work of adhesion of the 2 ceramics. Silanization is preferable to etching.
Etched porcelain-bonded restorations have become the treatment of choice for the esthetic restoration of anterior teeth. The bond strength of composite resin to properly etched and silanated porcelain exceeds the cohesive strength of porcelain. Although bonding to enamel is accomplished by only etching the surface to create micromechanical retention, bonding to porcelain is achieved both mechanically through etching porcelain and chemically through the use of a silane coupling agent. Literature supports silanization of porcelain, which provides a more reliable bond than etching with hydrofluoric acid only, although the combination of both are recommended. This article discusses the importance of proper silanization of porcelain in obtaining a durable and reliable resin composite bond with porcelain.
The aim of this in vitro study was to evaluate the long-term bond strength of adhesive bonding systems to yttrium-oxide-partially-stabilized zirconia ceramic (YPSZ).
Plexiglas tubes filled with resin composite were bonded to industrially manufactured zirconia ceramic disks (96% ZrO2 stabilized by 4% Y2O3). After air abrading the ceramic and ultrasonic cleansing, groups of 16 samples were bonded in an alignment apparatus using 7 different bonding methods. Subgroups of 8 bonded samples were tested for tensile strength following storage in distilled water at 37 degrees C either for 3 days or 2 years. In addition, the 2-year samples were thermocycled 37,500 times. The statistical analyses were conducted with the Kruskal-Wallis test followed by multiple pair-wise comparison of the groups using the Wilcoxon rank sum test.
A moderate to relatively high initial bond strength was achieved by air abrasion alone, the additional use of a silane, or acrylizing the YPSZ surface in combination with a conventional bis-GMA resin composite. However, these methods failed spontaneously over storage time. The use of the bis-GMA resin composite after tribochemical silica coating of YPSZ and the use of a polyacid-modified resin composite after air abrasion of YPSZ resulted in a high initial bond strength which decreased significantly over storage time. A durable resin bond strength to YPSZ was achieved only after air abrasion of YPSZ and using one of two resin composites containing a special phosphate monomer.
A durable bond strength to YPSZ was achieved only by using resin composites containing a special adhesive monomer.
The objective of this in vitro study employing the microtensile test was to test the hypothesis that the tensile bond strength of hot-pressed ceramics to composite is controlled by the ceramic microstructure and the ceramic surface treatment.
Hot-pressed IPS Empress (E1) and IPS Empress 2 (E2) ceramic blocks were polished with 1-micron alumina abrasive and treated as follows: group 1: 9.6% hydrofluoric acid (HF) on E1; group 2: 4% acidulated phosphate fluoride (APF) on E1; group 3: silane (S) on E1; group 4: HF + S on E1; group 5: APF + S on E1; group 6: HF on E2; group 7: APF on E2; group 8: S on E2; group 9: HF + S on E2; group 10: APF + S on E2. The surfaces as described above were then treated with Scotchbond Multi-Purpose Plus and covered with composite (Z-100). From the blocks obtained in this manner, specimens for microtensile testing were created by sectioning. Twenty bar specimens for each group were loaded to failure under tension using an Instron testing machine.
Mean tensile bond strength (MPa) and standard deviation values are as follows: (1) 9.9 +/- 1.2; (2) 0; (3) 27.2 +/- 4.8; (4) 20.6 +/- 3.0; (5) 13.6 +/- 4.5; (6) 41.7 +/- 6.7; (7) 19.1 +/- 2.6; (8) 30.1 +/- 5.3; (9) 56.1 +/- 4.1; (10) 36.9 +/- 3.9. All fractures occurred within the adhesion zone. SEM images of chemically etched specimens revealed that HF produced greater surface degradation and greater bond strength than APF for both E1 and E2 ceramics. The mean bond strength of groups 6 through 10 (E2) was significantly greater than that of groups 1 through 5 (E1) for each treatment condition.
The tensile fracture resistance of the composite-ceramic adhesion zones is controlled primarily by ceramic microstructure and ceramic surface treatment.
To evaluate the influence of the different polymerization types of two chemically-cured (Panavia 21 and Super-Bond C&B) and three dual-cured (Panavia Fluoro Cement, Clapearl DC, and Vita Cerec Duo Cement) resin luting agents on the early bond strengths and durability of bond to a Cerec 2 ceramic material.
The Cerec 2 ceramic specimens were prepared with No. 600 silicon carbide paper and their surfaces were etched with phosphoric acid gel, and applied with silane coupling agent. Two sizes of specimens were then bonded together with each of the five luting agents. Shear bond tests were performed 10 mins or 20 mins after preparing specimens, storage in water at 37 degrees C for 24 hrs, and/or 20,000 thermocycles between 4 degrees C and 60 degrees C water baths.
The specimens bonded with one of the three dual-cured resin luting agents showed almost the same shear bond strengths for all four storage conditions. However, two chemically-cured resin luting agents exhibited much lower shear bond strengths at 10- and 20-min intervals than at 0 and 20,000 thermocycles. Three dual-cured resin luting agents showed significantly higher bond strengths than two chemically-cured resin luting agents at 10- and 20-min intervals.
The purpose of this study was to determine if the durability of resin-dentin bonds could be evaluated more quickly if the bond specimen was divided into 1 x 1 x 8 mm beams incubated at 37 degrees C for a 90-day period.
Extracted human third molars were prepared for bonding by removing the occlusal surface near the dento-enamel junction (superficial dentin group) or near the pulp (deep dentin group). The teeth were bonded either with MacBond, One Step or Clearfil Liner Bond 2, and then builtup to form a flat resin composite crown. After 24 hours in water, each buildup was vertically divided into slabs 1 mm thick, the top half of which was resin, with the bottom half as dentin. Each slab was then vertically sectioned at 1-mm increments to create 1 x 1 x 8-mm beams of resin-bonded dentin. They were incubated for 1 day or 90 days at 37 degrees C, followed by measurement of the tensile bond strengths. The results were analyzed by the Least-Squares Means method at the 95% confidence level.
MacBond gave the highest (p < 0.05) 1-day bond strengths to superficial dentin, but significantly lower bond strengths were measured in deep dentin. There were no significant differences in the bond strengths of either One Step or Clearfil Liner Bond 2 to superficial vs deep dentin at 1 day, but at 90 days their bond strengths to deep dentin had fallen significantly (p < 0.05). Prepolymerized cylinders of resin composite bonded together with One Step showed little variation in bond strength over the 90-day experiment. SEM examination of the failed bonds showed increased porosity in intertubular dentin over time.
The results indicate that division of large specimens into many small beams accelerated the deterioration of bond strength in deep dentin in all three bonding systems and in both superficial and deep dentin in the MacBond treated specimens. This method seems promising for studying the durability of resin-dentin bonds.
Próteses livres de metal em porce1. lana. Reabilitação de espaços protéticos Revista Eletrônica da Dental Special JADA Disponível em: www.dentalspecial.com.br/artigos
- Ma Andaku
- Aj Carreira
- D Vieira
Andaku MA, Carreira AJ, Vieira D. Próteses livres de metal em porce1.
lana. Reabilitação de espaços protéticos. Revista Eletrônica da Dental
Special. JADA Disponível em: www.dentalspecial.com.br/artigos/2001
outubro03/artigo3.asp
Andreata Filho OD, Nishioka RS, Almeida EES. Construção de um
2.
torno mecânico para realizar preparos dentais padronizados.[resumo
1047] Pesqui Odontol Bras,. 2000;14 Supl.1:17.
Cimentação de 6. próteses livres de metal. In:__. Estética em reabilitação oral: metal free. São Paulo: Artes Médicas
- M A Bottino
- A F Quintas
- E Miyashita
- Vgs Oliveira
- P A Brunton
- P Smith
- J F Mccord
- N H Wilson
Bottino MA, Quintas AF, Miyashita E, Oliveira VGS. Cimentação de
6.
próteses livres de metal. In:__. Estética em reabilitação oral: metal
free. São Paulo: Artes Médicas; 2001. cap.7, p.394.
Brunton PA, Smith P, McCord JF, Wilson NH. Procera all-ce-7.
ramic crows: a new approach to an old problem? Br Dent J. 1999
may.;186(9):430-4.
In: ___. Inlay e onlay: 12. metálica e estética
- Garone Netto
- N Burguer
- Rc Cimentos
Garone Netto N, Burguer RC. Cimentos. In: ___. Inlay e onlay:
12.
metálica e estética. São Paulo: Santos, Quintessence; 1998. cap. 6,
p107-28.
Resistência à microtracão entre dois cimentos resinosos e uma cerâmica vítrea de dissilicato de lìtio
- Ma Bottino
Bottino MA. Resistência à microtracão entre dois cimentos resinosos
e uma cerâmica vítrea de dissilicato de lìtio. Rev Fac Odontol UMS.
2003;11(21):41-50.
Procedimentos de cimentação de próteses fixas
- Moreira Júnior
Moreira Júnior MT. Procedimentos de cimentação de próteses fixas. In:
20.
Odontologia reabilitadora: noções básicas para o clínico
- Mpc Rocha
Rocha MPC. Odontologia reabilitadora: noções básicas para o clínico.
São Paulo: Santos; 2000. cap.15, p.205-29.
Facetas laminadas em porcelana. Maxi-odonto: dentística 26. 1995 nov/dez
- J R Souza
Souza JR. Facetas laminadas em porcelana. Maxi-odonto: dentística
26.
1995 nov/dez;1(6):1-66.
Próteses livres de metal em porce-1. lana. Reabilitação de espaços protéticos
- M A Andaku
- A J Carreira
- D Vieira
Andaku MA, Carreira AJ, Vieira D. Próteses livres de metal em porce-1.
lana. Reabilitação de espaços protéticos. Revista Eletrônica da Dental
Special. JADA Disponível em: www.dentalspecial.com.br/artigos/2001
outubro03/artigo3.asp
Construção de um 2. torno mecânico para realizar preparos dentais padronizados
- Andreata Filho
- O D Nishioka
- R S Almeida
Andreata Filho OD, Nishioka RS, Almeida EES. Construção de um
2.
torno mecânico para realizar preparos dentais padronizados.[resumo
1047] Pesqui Odontol Bras,. 2000;14 Supl.1:17.
Restorative dental materials. 10.ed. St. louis: Mosby: Mis-10. souri
- R G Craig
Craig RG. Restorative dental materials. 10.ed. St. louis: Mosby: Mis-10.
souri; 1997. cap.17, p.468.
Bottino MA. Resistência à microtracão entre dois cimentos resinosos e uma cerâmica vítrea de dissilicato de lìtio
- Fpp Leite
- E T Kimpara
- Andreata Valandro Lf
- O D Filho
- A G Lopes
leite FPP, Kimpara ET, Valandro lF, Andreata Filho OD, lopes AG,
17.
Bottino MA. Resistência à microtracão entre dois cimentos resinosos
e uma cerâmica vítrea de dissilicato de lìtio. Rev Fac Odontol UMS.
2003;11(21):41-50.
José Cesário, 43 Apto 61 -Bloco B Alto dos Passos Juiz
- Correspondência
Correspondência:
Fabíola Pessoa Pereira leite
Endereço: Rua Dr. José Cesário, 43
Apto 61 -Bloco B
Alto dos Passos
Juiz de Fora -MG
36025-010