Longevity of metal-ceramic crowns cemented with self-adhesive resin cement: a prospective clinical study

Resin cements are often used for single crown cementation due to their physical properties. Self-adhesive resin cements gained widespread due to their simplified technique compared to regular resin cement. However, there is lacking clinical evidence about the long-term behavior of this material. The aim of this prospective clinical trial was to assess the survival rates of metal-ceramic crowns cemented with self-adhesive resin cement up to six years. One hundred and twenty-nine subjects received 152 metal-ceramic crowns. The cementation procedures were standardized and performed by previously trained operators. The crowns were assessed as to primary outcome (debonding) and FDI criteria. Statistical analysis was performed using Kaplan-Meier statistics and descriptive analysis. Three failures occurred (debonding), resulting in a 97.6% survival rate. FDI criteria assessment resulted in scores 1 and 2 (acceptable clinical evaluation) for all surviving crowns. The use of self-adhesive resin cement is a feasible alternative for metal-ceramic crowns cementation, achieving high and adequate survival rates.

Longevity of metal-ceramic crowns cemented with self-adhesive resin cement: a prospective clinical study

Abstract Resin cements are often used for single crown cementation due to their physical properties. Self-adhesive resin cements gained widespread due to their simplified technique compared to regular resin cement. However, there is lacking clinical evidence about the long-term behavior of this material. The aim of this prospective clinical trial was to assess the survival rates of metal-ceramic crowns cemented with self-adhesive resin cement up to six years. One hundred and twenty-nine subjects received 152 metal-ceramic crowns. The cementation procedures were standardized and performed by previously trained operators. The crowns were assessed as to primary outcome (debonding) and FDI criteria. Statistical analysis was performed using Kaplan-Meier statistics and descriptive analysis. Three failures occurred (debonding), resulting in a 97.6% survival rate. FDI criteria assessment resulted in scores 1 and 2 (acceptable clinical evaluation) for all surviving crowns. The use of self-adhesive resin cement is a feasible alternative for metal-ceramic crowns cementation, achieving high and adequate survival rates.

Influence of insertion techniques for resin cement and mechanical cycling on the bond strength between fiber posts and root dentin.

PURPOSE: To evaluate the effect of the insertion technique for resin cement and mechanical cycling on the bond strength between fiber posts and root dentin. MATERIALS AND METHODS: Sixty-four single-rooted bovine teeth were endodontically prepared to receive glass-fiber posts. The insertion of cement into the root canal was performed using one of the following techniques: POS, insertion with the post; LEN, the use of a lentulo-type drill; EXP, insertion with a straight-tip explorer; or CEN, the use of a Centrix syringe. Half of the specimens were mechanically cycled. All specimens were sectioned into slices of 1.8 mm for the push-out test and 0.5 mm for analysis of the cement layer quality. RESULTS: The insertion technique affected the interaction between factors (bond strength and mechanical cycling; p < 0.0001). Insertion of the Centrix syringe after mechanical cycling showed the highest bond values (13.6 ± 3.2 MPa). Group-to-group comparisons for baseline and cycled conditions indicated that mechanical cycling significantly influenced the bond strength (p < 0.0001) of the POS and CEN groups. The quality of the cement layer did not differ between the techniques when evaluated in the middle (p = 0.0612) and cervical (p = 0.1119) regions, but did differ in the apical region (p = 0.0097), where the CEN group had better layer quality for the two conditions tested (baseline and cycled). CONCLUSION: The use of the Centrix syringe improved the homogeneity of the cement layer, reducing the defects in the layer and increasing adhesive strength values to dentin, even after mechanical cycling.

Microtensile bond strength of photoactivated and autopolymerized adhesive systems to root dentin using translucent and opaque fiber-reinforced composite posts.

STATEMENT OF PROBLEM: The use of fiber-reinforced composite resin posts in endodontically treated teeth has increased. However, selecting an adhesive system that provides reliable and long-lasting bonding to root canal dentin remains difficult. PURPOSE: This study evaluated the microtensile bond strength of 2 adhesive systems to root dentin and 2 different fiber-reinforced composite resin posts. MATERIAL AND METHODS: Forty single-rooted teeth were instrumented, and root canals were prepared for translucent (Light Post [LP]) or opaque (Aestheti Post [AP]) quartz fiber-reinforced composite resin posts. Two adhesive systems were used: Scotchbond Multi-Purpose Plus (SBMP) (autopolymerized) as a control group, and Single Bond (SB) (photoactivated). Teeth were assigned to 4 groups (n=10): SBMP+LP, SBMP+AP, SB+LP, SB+AP. After post cementation, roots were perpendicularly sectioned into 1-mm-thick slices, which were trimmed to obtain dumbbell-shaped specimens. The specimens were divided into 3 regions: cervical (C), middle (M), and apical (A). To determine the bond strength, the bonding area of each specimen was calculated, and specimens were attached to a device to test microtensile strength at a crosshead speed of 1 mm/min. Data were analyzed using 3-way analysis of variance and the Tukey test (alpha=.05). Fractured specimens were examined under a x 25 stereomicroscope to determine the mode of fracture. RESULTS: There were significant differences only among root dentin regions (P<.001). The cervical third (9.16 +/- 1.18 MPa) presented higher mean bond strength values, especially for SBMP. Middle and apical regions demonstrated lower values (7.08 +/- 0.92 and 7.31 +/- 0.60 MPa, respectively). Adhesive and post main factors did not demonstrate significance. Also, no interaction was significant. No cohesive fractures within resin cement, fiber-reinforced composite resin post, or root dentin were identified. CONCLUSIONS: Both adhesive systems tested demonstrated reliable bonding when used with translucent and opaque fiber-reinforced composite posts.

Avaliação, por microtração, da resistência adesiva entre um cimento resinoso e uma cerâmica aluminizada com e sem o uso de um agente silanizador / Evaluation, by the microtensile test, of the bond strength between a resin cement and a alumina ceramic with and without the use of a silane coupling agent

A resistência adesiva entre uma cerâmica aluminizada (Procera) e um cimento resinoso (Panavia F), com e sem o uso de agente silanizador (Clearfil Porcelain Bond- Sistema Clearfil SE Bond) foi avaliada por ensaio de microtração. Foram confeccionados blocos de cerâmica do sistema Procera (15mmx6mmx6mm). Cada bloco foi dividido em 3 segmentos (5mmx6mmx6mm), os quais constituíram dois grupos: Grupo A- tratamento da superfície cerâmica com jato de Al2O3 e cimentação à um substrato resinoso com o cimento (Panavia F); Grupo B- tratamento da superfície da cerâmica com jato de Al2O3, silanização da mesma (Clearfil Porcelain Bond) e cimentação à um substrato resinoso (Panavia F). Os conjuntos cerâmica/cimento/resina foram armazenados em água destilada à temperatura de 37ºC por sete dias, após o que foram cortados de forma a se obter, para cada grupo, um total de 27 corpos-de-prova medindo 10mmx1mmx1mm e com área de avaliação adesiva de 1mm2 ± 0,1mm . Em seguida foram tracionados em máquina de ensaios universal (EMIC DL 1000) com velocidade de 0,5mm/min até a ruptura. A análise estatística pelo método teste T (Student) dos dados obtidos mostrou que os valores da resistência adesiva (MPa) de GA (média 12,65 ± 2,75) e GB (16,47±3,38) diferiram estatisticamente (p < 5%). Concluímos que o uso do agente silanizador aumentou e resistência de união adesiva entre o cimento resinoso e a cerâmica estudados.

This study evaluated the adhesive bond strength between a alumina ceramic (Procera Allceram) and a resin cement (Panavia F), with and without the use of a silane coupling agent Clearfil SE Bond Sistem), using the microtensile bond strength test. Were made 2 ceramic blocks of Procera (15mmx6mmx6mm) and them they were cute in 3 smaller blocks (5mmx6mmx6mm) that formed two groups: Group A- surface treatment with Al2O3 and cimentation to a composite resin block using Panavia F resin cement; Group B- surface treatment with Al2O3, silanization with Clearfil Porcelain Bond and cimentation to a composite resin block using Panavia F resin cement. The ceramic/cement/resin blocks was stored at 37ºC in distilled water for one week. After this procedure the ceramic/cement/resin blocks was cute in samples. In each group there were 27 samples with the following dimensions: 10mmx1mmx1mm. The adhesive area was 1mm2±0,1mm2. The samples were submitted to a microtensile bond strength test in a universal testing machine (EMIC- DL 1000) with the crosshead speed of 0.5 mm/min until fracture. The statistical analysis using the T test (Student) showed us that Group A (mean 12.65±2.75) and Group B (mean 16.47±3.38) were statistically different (p< 5%). Its possible to conclude that the silane coupling agent increased the bond strength between the resin cement and the ceramic used in this study.

Microtensile bond strength of light- and self-cured adhesive systems to intraradicular dentin using a translucent fiber post.

This study evaluated the bond strength of a light- and self-cured adhesive system to different intraradicular dentin areas (cervical, middle and apical thirds). Twenty single-rooted teeth were instrumented and their roots were prepared to receive a #2 translucent fiber post (Light Post). The root canals were irrigated with 0.5% sodium hypochlorite for one minute, rinsed with water and dried using paper tips. The teeth were divided into two groups (n=10): Single Bond [SB] (light-cured) and Scotchbond Multi-Purpose Plus [SBMP] (self-cured). To avoid polymerization of the materials through the root lateral walls, the teeth were placed in a silicone mold and the adhesives applied with a thin microbrush according to manufacturer's instructions. The resin cement, Rely X ARC, was inserted into the root canals using Lentulo burs. The post was then placed and the light-curing procedure was carried out for 40 seconds (+/-500 mW/cm2). The roots were kept in a 100% relative moisture environment for 24 hours and stored in distilled water for an additional 24 hours. Each root was perpendicularly sectioned into 1-mm thick sections, resulting in approximately four slices per region. Dumbbell-shaped slices were obtained by trimming the proximal surfaces of each slice using a diamond bur until it touched the post. The bonded area was calculated, slices were attached to a special device and submitted to microtensile testing at 1 mm/minute crosshead speed. Data were analyzed using ANOVA and Tukey's test. The mean bond strength values (MPa) were: SBMP: cervical=10.8a, middle=7.9b%, apical=7.1bc; SB: cervical=8.1b, middle=6.0c, apical=6.9b. Significant differences were found between adhesive systems only for the cervical third. The cervical region showed higher mean bond strength values than the middle and apical regions (p<0.0001).

Resistência a microtração entre uma cerâmica hidrotérmica e um cimento resinoso, submetidos ou não à ciclagem térmica / Microtensile bond strength between a hidrotermal ceramic and a resin cement, submitted or not to thermal cycling treatment

Objetivou-se, com este trabalho, avaliar por ensaio de microtração, a resistência adesiva entre uma cerâmica (Symbio Ceram, Degussa Dental) e um cimento resinoso (Panavia F, Kuraray), submetidos ou não à ciclagem térmica. Para tanto, foram obtidos três blocos cerâmicos com dimensões de 5mmx6mmx6mm; sua suprefície de colagem (6mm x 5mm) foi polida com lixa (#600), acondicionada com ácido fluorídrico a 10% e silanizada, de acordo com as recomendações do fabricante. A seguir, os blocos foram cimentados a outros de resina composta com as mesmas dimensões, sob carga de 1 Kg. Após isso, foram mantidos em água destilada à temperatura ambiente durante 7 dias e cortados de forma a se obteram 20 corpos-de-prova com dimentsões de 10mmx1mmx1mm, propiciando área adesiva de 1mm²±0,1mm² e dividios em dois grupos submetidos aos seguintes tratamentos: G1 (controle) - manutenção em água destilada a temperatura ambiente durante três dias - e G2 - ciclagem térmica (1500 ciclos) em dois banhos (5ºC e 55ºC), com tempo de permanência de 30 segundos cada, após o que, foram tracionados em máquinas de ensaio universal (EMIC), com célula de carga de 10kgf e velocidade de 0,5mm.min-1. Os resultados númericos (MPa) foram lançados em tabela própria e submetidos à análise estatística Mann-Whitney (alfa=0,05), demonstrando que G1 (27,06±10,59) não diferiu estatisticamente de G2 (22,55±4,81). Considerando a metodologia aplicada e os resultados obtidos, parece-nos lícito concluir que a ciclagem térmica não influenciou a resistência adesiva entre os materiais estudados

Rugosidade de superfície, dureza Vickers e resistência à flexão de resinas acrílicas quimicamente ativadas utilizadas em coroas temporárias / Roughness, vickers hardness and flexural resistance of auto-cured acrylic resins used for temporary crowns

O objetivo deste estudo foi comparar rugosidade superficial, resistência à flexão e microdureza de duas resinas acrílicas quimicamente ativadas (Dencrilay Speed II, Dencril; Duralay, Reliance) utilizadas para a confecção de coroas temporárias. Para a análise da rugosidade superficial e microdureza foram utilizados corpos-de-prova cilíndricos de 8mm de diâmetro e 2mm de espessura. Para o ensaio de flexão de três pontos foram confeccionados corpos-de-prova com 10x2x1mm. Os resultados obtidos foram submetidos ao teste t de Student, ao nível de significância de 5%. A resina Duralay apresentou maiores valores de rugosidade de superfície; a resina Dencrilay Speed II apresentou maiores valores de microdureza; e ambas apresentaram comportamento semelhante quanto à resistência à flexão

Resistência à microtação entre uma cerâmica hidrotérmica, silanizada ou não, aderida à uma resina composta por um cimento resinoso / Microtensile bond strenght between a hidrothermal silanized or not ceramic, and a resin cement

Esse trabalho teve como objetivo avaliar a resistência adesiva entre uma cerâmica hidrotérmica (Symbio ceram, Degussa), silanizada ou não e aderida à uma resina composta (Filtec Z100-3M ESPE) por um cimento resinoso (Panavia F, Kuraray). Foram confeccionados 2 blocos, divididos em 2 grupos assim constituídos: Grupo I-tratamento de superfície da cerâmica com ácido fluorídrico a 10 por cento, aplicação de Silano (Dentisply) e união a um substrato (resina composta) com cimento resinoso. Os blocos foram armazenados em água destilada por 7 dias a 37ºC. Em seguida, foram cortados de forma a obter, para cada grupo, 10 corpos-de-prova com dimensões aproximadas de 10mmx1mmx1mm e área de avaliação de 1mm2+/- 0,1mm2, os quais foram tracionados em máquina de ensaios universal (EMIC) na velocidade de 0,5mm.min-1. Os valores médios (MPa) foram submetidos aos testes estatísticos T test (paramétrico) e U-Mann-Whitney (não paramétrico), mostrando que o Grupo I (média 15,09+/-3,97 e mediana 16,63) diferiu estatisticamente do Grupo II (média 27,06+/-10,59 e mediana 26,370) (t=3,78; gl=18; p-valor= 0,004). Em função da metodologia empregada e dos resultados obtidos conclui-se que a aplicação de silano aumentou a resistência adesiva do cimento resinoso à cerâmica.