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Calixto ET, Kelmer VF, Komegae GH, Pacheco RR, Pini N, Sundfeld D. Influence of Varied Silane Commercial Brands and Adhesive Application on Bond Strength and Stability to Lithium Disilicate Glass Ceramic. Oper Dent 2024; 49:325-335. [PMID: 38632867 DOI: 10.2341/23-124-l] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 12/05/2023] [Indexed: 04/19/2024]
Abstract
OBJECTIVES This study aimed to evaluate the impact of various commercial silane brands with varied chemical compositions with or without the application of an adhesive layer on the microshear bond strength and durability of a resin luting agent to lithium disilicate glass ceramic. METHODS AND MATERIALS Lithium disilicate glass ceramic discs (EMX, IPS e.max Press, Ivoclar Vivadent) measuring 10 mm in diameter and 3 mm in thickness were fabricated (n=240). Surfaces were etched using 5% hydrofluoric acid and randomly assigned to 10 groups based on the commercial brand of silane used (n=24): [RP] RelyX Ceramic Primer (3M ESPE); [PS] Prosil (FGM); [SA] Silano (Angelus); [SM] Silano (Maquira); [SU] Silane (Ultradent); [GL] GLUMA Ceramic Primer (Kulzer); [CB] Ceramic Bond (VOCO); [MB] Monobond N (Ivoclar Vivadent); [CP] Clearfil Ceramic Primer (Kuraray); and [DE] 2-step silane (Dentsply Sirona). Half of the EMXs (n=12) received a thin adhesive layer (+) after the silane and prior to resin luting agent, while the other half (n=12) did not receive an adhesive layer (-). For the microshear bond strength test (μSBS), four light-cured resin luting agent cylinders (1 mm in diameter) were created on each EMX surface. Half of these specimens were tested after 24 hours, while the other half were stored in deionized water for 6 months. The μSBS test was conducted using a universal testing machine (DL 500, EMIC) at a crosshead speed of 1 mm/min until failure. The obtained data underwent statistical analysis using analysis of variance (ANOVA) and the Tukey test (α=0.05). RESULTS There was significant influence of the silane commercial brand on bond strength. Notably, "universal primers" yielded lower bond strength results compared to "pure" silane solutions. Water storage had a detrimental effect on microshear bond strength for certain silane commercial brands. Additionally, the application of an adhesive layer negatively impacted bond strength results for all silanes. CONCLUSIONS This study confirms the importance of both silane commercial brand and chemical composition in relation to bond strength of resin luting agents to lithium disilicate glass ceramic. Furthermore, the application of an adhesive layer may have an adverse effect on bond stability over time.
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Affiliation(s)
- E T Calixto
- Emerson Tavares Calixto, DDS, MSc student, Ingá University Center, Uningá, Maningá, PR, Brazil
| | - V F Kelmer
- Vinicius Fernandez Kelmer, DDS student, Ingá University Center, Uningá, Maningá, PR, Brazil
| | - G H Komegae
- Gabriely Hikari Komegae, DDS, MSc student, Ingá University Center, Uningá, Maningá, PR, Brazil
| | - R R Pacheco
- Rafael Rocha Pacheco, DDS, MSc, PhD, associate professor and section director of Dental Materials, Department of Restorative Sciences, The Dental College of Georgia at Augusta University, Augusta, GA, USA
| | - Nip Pini
- Nubia Inocencya Pavesi Pini, DDS, MSc, PhD, adjunct professor, School of Dentistry, Department of Restorative Dentistry and Prosthodontics, Ingá University Center, Uningá, Maningá, PR, Brazil
| | - D Sundfeld
- *Daniel Sundfeld, DDS, MSc, PhD, adjunct professor, Department of Restorative Dentistry and Prosthodontics, Ingá University Center, Uningá, Maningá, PR, Brazil
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Dos Santos D, Pacheco RR, Komegae GH, da Silva JA, Lima D, Pini N, Sundfeld D. Effects of Hydrofluoric Acid Concentrations, Commercial Brands, and Adhesive Application on the Bond Strength of a Resin Luting Agent to Lithium Disilicate Glass Ceramic. Oper Dent 2023; 48:700-710. [PMID: 37881098 DOI: 10.2341/23-034-l] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 06/19/2023] [Indexed: 10/27/2023]
Abstract
OBJECTIVES To evaluate the surface topography/roughness and bond strength of a resin luting agent to a lithium disilicate glass ceramic after etching with different concentrations of hydrofluoric acid (HF) and commercial brands. METHODS For bond strength evaluation, 260 lithium disilicate glass ceramic (EMX) discs were randomly distributed into 13 groups based on concentrations of HF and commercial brands (n=20): 5% and 10%, Lysanda (LY5 and LY10); 5% and 10%, Maquira (MA5 and MA10); 5% and 10%, FGM (FG5 and FG10); 4.8%, Ivoclar Vivadent (IV5); 5% and 10%, PHS do Brasil (PH5 and PH10); 5% and 10%, BM4 (BM5 and BM10); 9%, Ultradent Inc (UL10); and Dentsply (DE10). A further random distribution (n=10) was made based on the application (+) or absence (-) of an adhesive layer. Resin luting agent cylinders (1 mm in diameter) were added on EMX surfaces, light-cured, and stored for 24 hours in deionized water at 37°C. On a universal testing machine (DL 500, EMIC), specimens were submitted to a microshear bond strength test at a crosshead speed of 1 mm/min until failure. A representative etched EMX disc from each group underwent surface topography analysis using field-emission scanning electron microscopy (n=1), and five (n=5) etched EMX discs from each group were tested for surface roughness. Data were statistically analyzed using analysis of variance and Tukey test (α=0.05). RESULTS A less conditioned and smoother surface was observed for 5% HF compared to 10%. Additionally, commercial brands of HF were shown to affect bond strength. When the adhesive layer was not used (-), a 10% concentration promoted higher bond strengths to EMX. However, when adhesive was applied (+), the concentrations of HF and commercial brands had no effect on bond strength results. CONCLUSIONS A 10% concentration of HF results in higher bond strength than a 5% concentration. If an adhesive layer is applied, neither this distinction nor the influence of commercial brands is observed.
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Affiliation(s)
- Drc Dos Santos
- Diogo Robert Claudino dos Santos, DDS, MSc student, Department of Restorative Dentistry and Prosthodontics, Ingá University Center - UNINGÁ, Maringá, PR, Brazil
| | - R R Pacheco
- Rafael Rocha Pacheco, DDS, MSc, PhD, associate professor, Department of Restorative Sciences, Dental College of Georgia - Augusta University, Augusta, GA, USA
| | - G H Komegae
- Gabriely Hikari Komegae, DDS student, School of Dentistry, Ingá University Center - UNINGÁ, Maringá, PR, Brazil
| | - J A da Silva
- Juliana Andrade da Silva, DDS, MSc, PhD student, Department of Restorative Dentistry, Piracicaba School of Dentistry, University of Campinas - UNICAMP, Piracicaba, SP, Brazil
| | - Danl Lima
- Debora Alves Nunes Leite Lima, DDS, MSc, PhD, professor, Department of Restorative Dentistry, Piracicaba School of Dentistry, University of Campinas - UNICAMP, Piracicaba, SP, Brazil
| | - Nip Pini
- Nubia Inocêncya Pavesi Pini, DDS, MSc, PhD, adjunct professor, Department of Restorative Dentistry and Prosthodontics, Ingá University Center - UNINGÁ, Maringá, PR, Brazil
| | - D Sundfeld
- *Daniel Sundfeld, DDS, MSc, PhD, adjunct professor, Department of Restorative Dentistry and Prosthodontics, Ingá University Center - UNINGÁ, Maringá, PR, Brazil
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Marchioro RR, Pini NIP, Kelmer VF, Freitas KMS, Santos PH, Pacheco RR, Sundfeld D. Influence of Fit-checking Material and Cleaning Protocols on the Bond Strength of Lithium Disilicate Glass-ceramics. Oper Dent 2022; 47:E264-E272. [DOI: 10.2341/22-036-l] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 05/20/2022] [Indexed: 11/30/2022]
Abstract
SUMMARY
Objectives
To evaluate the bond strength of a resin luting agent to a lithium disilicate glass-ceramic after the use of different fit-checking materials and cleaning protocols.
Methods and Materials
Two hundred and forty-two (242) ceramic specimens were etched with 5% hydrofluoric acid for 20 seconds and distributed into 22 groups (n=10), in total. Four (4) groups were created based on fit-checking material and that had no following cleaning protocol: no fit-checking material used (control group); articulating paper; articulating spray; and fit-checker liquid. For each fit-checking material (3), 6 cleaning protocols were tested creating an additional 18 groups (n=10): air/water spray; 70% alcohol (ethanol); acetone; 35% phosphoric acid; 5% hydrofluoric acid; and a commercially available cleaning paste (Ivoclean, Ivoclar Vivadent). Silane and bonding resin were applied to all ceramic surfaces. Resin luting agent cylinders (1 mm in diameter) were created using silicone matrices, light-cured, and specimens were stored in deionized water at 37°C for 24 hours. Microshear bond strength test (μSBS) was performed on a universal testing machine (DL 500, EMIC) at a crosshead speed of 1 mm/min until failure. Results were statistically analyzed using ANOVA and Tukey’s test (α=0.05).
Results
Articulating paper and fit-checker liquid, when not properly removed, negatively affected the bond strength (p<0.05). None of the tested cleaning protocols were effective for articulating paper (p<0.05). There was no significant difference in bond strength after the cleaning protocols between articulating spray and fit-checker liquid when compared to the control group (no contamination) (p>0.05).
Conclusion
The cleaning protocols tested can effectively restore the bond strength of resin luting agents to lithium disilicate ceramics that were exposed to articulating spray or fit-checker liquid. The use of articulating paper is not recommended for fit-checking indirect lithium disilicate restorations.
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Affiliation(s)
- RR Marchioro
- Rayssa Ribeiro Marchioro, DDS, MSc student, Department of Restorative Dentistry and Prosthodontics, Ingá University Center – UNINGÁ, Maringá, PR, Brazil
| | - NIP Pini
- Nubia Inocêncya Pavesi Pini, DDS, MSc, PhD, adjunct professor, Department of Restorative Dentistry and Prosthodontics, Ingá University Center – UNINGÁ, Maringá, PR, Brazil
| | - VF Kelmer
- Vinícius Fernandez Kelmer, DDS graduate student, Ingá University Center – UNINGÁ, Maringá, PR, Brazil
| | - KMS Freitas
- Karina Maria Salvatore de Freitas, DDS, MSc, PhD, professor, Department of Orthodontics and Pediatric Dentistry, Ingá University Center – UNINGÁ, Maringá, PR, Brazil
| | - PH Santos
- Paulo Henrique dos Santos, DDS, MSc, PhD, associate professor, Department of Dental Materials and Prosthodontics, São Paulo State University, School of Dentistry, Araçatuba, SP, Brazil
| | - RR Pacheco
- Rafael Rocha Pacheco, DDS, MSc, PhD, associate professor, Division Director of Clinical Essentials and Simulation, University of Detroit Mercy, School of Dentistry, USA
| | - D Sundfeld
- *Daniel Sundfeld, DDS, MSc, PhD, adjunct professor, Department of Restorative Dentistry and Prosthodontics, Ingá University Center – UNINGÁ, Maringá, PR, Brazil
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Fagan J, Vesselovcz J, Puppin-Rontani J, Correr-Sobrinho L, Freitas KMS, Robertson TC, Pacheco RR, Pini NIP, Sundfeld D. Evaluation of Cleaning Methods on Lithium Disilicate Glass Ceramic Surfaces After Organic Contamination. Oper Dent 2022; 47:E81-E90. [DOI: 10.2341/20-176-l] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 04/24/2021] [Indexed: 11/23/2022]
Abstract
SUMMARY
The purposes of this study were to 1) evaluate the effectiveness of different cleaning methods from a previously etched and silanized lithium disilicate glass ceramic (EMX) surface after contact with organic fluids (saliva or human blood) and 2) assess the effect of applying a new silane layer after the cleaning methods on the microshear bond strength (mSBS) of resin cement to EMX. EMX discs were etched with 5% hydrofluoric acid (HF) and properly silanized. Three control groups were created (n=10): control (without contamination), saliva positive, and human blood positive. Later, after new contaminations, the samples were distributed into four groups according to the cleaning method (n=20): air–water spray (AWS), 35% phosphoric acid, 70% alcohol, or Ivoclean cleaning paste. After the cleaning methods, subgroups were submitted to a new silane layer application, or not (n=10). All samples received a thin layer of a bonding agent and, subsequently, three light-cured resin cement cylinders were prepared on each EMX surface for the mSBS test. This test was performed on a universal testing machine at a vertical speed of 1 mm/minute until rupture. Contaminated and cleaned silanized EMX surfaces were assessed by scanning electron microscopy (SEM) (n=1). The noncontaminated control group showed an average mSBS of 18.7 MPa, and the positive saliva and human blood control groups yielded a 34% and 42% reduction in bond strength, respectively, compared to the uncontaminated control (p<0.05). For saliva-contaminated surfaces, all cleaning methods were effective and not different from one another or the control group (p>0.05). However, for human blood contamination, only Ivoclean cleaning paste was effective in restoring μSBS to uncontaminated control group levels (p>0.05). SEM images showed a clean surface (ie, with no contaminant residues) after the cleaning methods, regardless of the organic contaminant type. All the assessed cleaning methods were effective in removing saliva from the silanized EMX surface; however, only Ivoclean was able to restore the adhesion quality when the silanized EMX surface was contaminated with human blood.
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Affiliation(s)
- J Fagan
- João Fagan Junior, DDS, MSc student, Department of Restorative Dentistry and Prosthodontics, Ingá University Center – UNINGÁ, Maringá, PR, Brazil
| | - J Vesselovcz
- João Vesselovcz Junior, DDS, MSc student, Department of Restorative Dentistry and Prosthodontics, Ingá University Center – UNINGÁ, Maringá, PR, Brazil
| | - J Puppin-Rontani
- Júlia Puppin Rontani, DDS, MSc, PhD, Dental Materials Division, Piracicaba School of Dentistry – UNICAMP, Piracicaba, SP, Brazil
| | - L Correr-Sobrinho
- Lourenço Correr Sobrinho, DDS, MSc, PhD, professor, Dental Materials Division, Piracicaba School of Dentistry – UNICAMP, Piracicaba, SP, Brazil
| | - KMS Freitas
- Karina Maria Salvatore de Freitas, DDS, MSc, PhD, professor, Department of Orthodontics and Pediatric Dentistry, Ingá University Center – UNINGÁ, Maringá, PR, Brazil
| | - TC Robertson
- Taylor Cliffe Robertson, DDS candidate, University of Detroit Mercy, School of Dentistry, Detroit, MI, USA
| | - RR Pacheco
- Rafael Rocha Pacheco, DDS, MSc, PhD, assistant professor, Restorative Dentistry, University of Detroit Mercy, School of Dentistry, Detroit, MI, USA
| | - NIP Pini
- Nubia Inocêncya Pavesi Pini, DDS, MSc, PhD, adjunct professor, Department of Restorative Dentistry and Prosthodontics, Ingá University Center – UNINGÁ, Maringá, PR, Brazil
| | - D Sundfeld
- *Daniel Sundfeld, DDS, MSc, PhD, adjunct professor, Department of Restorative Dentistry and Prosthodontics, Ingá University Center – UNINGÁ, Maringá, PR, Brazil
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Restorative Treatment of Amelogenesis Imperfecta with Prefabricated Composite Veneers. Case Rep Dent 2021; 2021:3192882. [PMID: 34394996 PMCID: PMC8355976 DOI: 10.1155/2021/3192882] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/20/2021] [Revised: 07/14/2021] [Accepted: 07/24/2021] [Indexed: 12/05/2022] Open
Abstract
This case report presents the use of prefabricated composite veneers for restorative treatment of amelogenesis imperfecta (AI). This technique bridges the gap between a conventional direct technique and a conventional indirect technique and introduces an alternative semidirect restorative technique for AI patients. The aim of this case report is to describe restoration of a young girl with severe AI using prefabricated composite veneers and to discuss the benefits and limitations of this technique compared to the alternative restorative techniques.
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Nascimento AR, Mantovani MB, Mendonça LC, Vesselovcz J, Pacheco RR, Pini NP, Sundfeld D. Two-Year Follow-Up of Self-Etching Ceramic Primer as Surface Treatment for Feldspathic Veneers: A Clinical Case Review. Oper Dent 2021; 46:126-135. [PMID: 34192329 DOI: 10.2341/20-036-t] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 08/22/2020] [Indexed: 11/23/2022]
Abstract
The two-step approach of applying hydrofluoric acid followed by silane is deemed the goldstandard surface treatment protocol before bonding to glass ceramics. Given hydrofluoric acid is a toxic conditioning agent and with the intention to simplify this step, the dental company Ivoclar Vivadent (Schaan, Lietchtenstein) released a self-etching ceramic primer, Monobond Etch & Prime in 2015, claiming that hydrofluoric acid and silane application would no longer be required prior to luting glass ceramics. Therefore, this clinical case report and retrospective analysis describes the replacement of unsatisfactory anterior veneers due to clinical failures for new feldspathic glass ceramic veneers, using the aforementioned self-etching ceramic primer. After two years, feldspathic glass ceramics presented satisfying clinical performance with absence of debonding, tooth sensitivity, recurrent carious lesions, or marginal infiltration.
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Ohrvik HG, Hjortsjö C. Retrospective study of patients with amelogenesis imperfecta treated with different bonded restoration techniques. Clin Exp Dent Res 2020; 6:16-23. [PMID: 32067400 PMCID: PMC7025981 DOI: 10.1002/cre2.243] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/22/2019] [Revised: 08/09/2019] [Accepted: 08/09/2019] [Indexed: 12/03/2022] Open
Abstract
OBJECTIVE The aim of this retrospective study was to evaluate clinical success and satisfaction of patients with amelogenesis imperfecta treated with three different types of bonded restorations at a university clinic. MATERIALS AND METHODS One hundred fifty-four restorations in 15 subjects with mean age of 17.3 years (SD 8.2) were evaluated after treatment with three different types of bonded restorations: all ceramic enamel-dentin bonded restorations, prefabricated composite veneers, and direct composite resin restorations. A modified version of the Californian Dental Association system for quality evaluation of dental care and a questionnaire assessing patient satisfaction were used for classification. The restorations were evaluated with respect to patient satisfaction, esthetics, technical, and biological complications. RESULTS Mean observation period for the restorations was 42.5 months (SD 35.6). All restorations were in place at the time of the examination. Surface and color calibration showed a success of 95% for the ceramic enamel-dentin bonded restorations, 44% for the direct composite resin restorations, and 0% for the prefabricated composite veneers. The same pattern was evident for anatomy and marginal integrity. The subjects reported a high degree of satisfaction with both the esthetics and function of their restorations. CONCLUSION The results indicated that all ceramic restorations demonstrated the best results for patients with amelogenesis imperfecta.
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Affiliation(s)
- Hanne G. Ohrvik
- Department of Prosthetic Dentistry and Oral Function, Faculty of DentistryUniversity of OsloOsloNorway
| | - Carl Hjortsjö
- Department of Prosthetic Dentistry and Oral Function, Faculty of DentistryUniversity of OsloOsloNorway
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Tuma M, Ordóñez-Aguilera JF, Rodriguez CGB, Antunes RSCCA, Gallottini M. Oral alterations in patients with cystinosis. SPECIAL CARE IN DENTISTRY 2019; 39:631-635. [PMID: 31661163 DOI: 10.1111/scd.12426] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/31/2019] [Revised: 09/30/2019] [Accepted: 10/04/2019] [Indexed: 11/28/2022]
Abstract
Cystinosis is a rare autosomal recessive lysosomal storage disorder, which leads to abnormal accumulation of cysteine in various organs, including progressive dysfunction of kidneys. The most severe and frequent form, affecting ∼95% of patients, is termed infantile nephropathic cystinosis (NC) (OMIM 219800). We have reported oral findings in two patients with NC and described esthetic and functional rehabilitation in one of them. The first case describes a 16-year-old male patient, who was diagnosed with NC when he was 1-year-old. The patient exhibited generalized enamel hypoplasia, grade 1 drug-induced gingival overgrowth, caries lesion in molar tooth and supernumerary tooth (ie, distomolar). The second case describes a 14-year-old male patient diagnosed with NC at 3 years old. Clinical examination revealed generalized enamel hypoplasia and grade 1 drug-induced gingival overgrowth. Radiographic examination showed supernumerary tooth (mesiodens). The treatment included gingivoplasty and restoration with direct composite resin. The severity of hypoplasia highlights the importance of a dental rehabilitation treatment, as proposed here. Direct restoration with composite resin allowed harmony, function, and esthetics to be restored, in addition to being a rapid and low-cost technique.
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Affiliation(s)
- Marina Tuma
- PhD student at Special Care Center, School of Dentistry, University of São Paulo, São Paulo, São Paulo, Brazil
| | - Juan Fernando Ordóñez-Aguilera
- PhD student at Department of Restorative Dentistry, School of Dentistry, University of São Paulo, São Paulo, São Paulo, Brazil
| | | | | | - Marina Gallottini
- Full professor at School of Dentistry, Special Care Center, University of São Paulo, São Paulo, São Paulo, Brazil
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Sundfeld D, Pavani CC, Pini N, Machado LS, Schott TC, Sundfeld RH. Enamel Microabrasion and Dental Bleaching on Teeth Presenting Severe-pitted Enamel Fluorosis: A Case Report. Oper Dent 2019; 44:566-573. [PMID: 30702410 DOI: 10.2341/18-116-t] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
The present clinical case report describes the clinical steps of enamel microabrasion associated with dental bleaching to restore severely-pitted fluorosed teeth. The process of removing the fluorotic superficial stains started by using macroabrasion with a water-cooled fine tapered 3195 FF diamond bur. Rubber dam isolation of the operative field was used to remove the remaining enamel stains and superficial irregularities with the Opalustre microabrasive compound (6.6% hydrochloric acid associated with silicon carbide particles) followed by polishing using fluoridated paste and subsequent 2% neutral fluoride gel topical application. After one month, dental bleaching was performed using 10% carbamide peroxide in custom-formed acetate trays for two hours/day for 42 days. The association of enamel microabrasion with dental bleaching was effective for reestablishing the dental esthetics of a patient with severe dental fluorosis.
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Sundfeld D, Palialol ARM, Fugolin APP, Ambrosano GMB, Correr-Sobrinho L, Martins LRM, Pfeifer CS. The effect of hydrofluoric acid and resin cement formulation on the bond strength to lithium disilicate ceramic. Braz Oral Res 2018; 32:e43. [PMID: 29846386 DOI: 10.1590/1807-3107bor-2018.vol32.0043] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/02/2017] [Accepted: 04/11/2018] [Indexed: 11/22/2022] Open
Abstract
To investigate how the hydrofluoric acid (HF) concentrations applied to a lithium disilicate glass-ceramic (EMX) affects the surface morphology and microtensile bond strength (μTBS) of ceramics to dentin, using light-cured resin cements with or without UDMA. Sixty-three EMX square ceramic blocks were etched for 20 seconds using different HF concentrations (1%, 5% and 10%) and luted to dentin using two types of resin cement combinations: BisGMA/TEGDMA and BisGMA/TEGDMA/UDMA (n = 10). Each bonded EMX-dentin block was sectioned to obtain 1 mm2 sticks for μTBS evaluation. Half of the sticks were tested after 24 hours and the other half was assessed after 6 months of water storage. Data were statistically assessed using split-plot three-way ANOVA and multiple comparisons were performed using the Tukey's post hoc test (α = 0.05). One EMX sample from each HF concentration was analyzed using field-emission scanning electron microscope (FE-SEM) to characterize the etching pattern. According to the FE-SEM images, increasing the concentration of HF from 1 to 5 and then to 10% led to increased removal of glassy matrix and greater exposure of lithium disilicate crystals. The 10% HF concentration yielded higher μTBS when compared to 1% for BisGMA/TEGDMA formulation (p < 0.05); whereas HF 1% and 5% showed similar μTBS values when compared to 10% HF for BisGMA/TEGDMA/UDMA resin matrix (p > 0.05) at both storage times. Water aging decreased the μTBS values (p < 0.05), except when 10% HF was associated with BisGMA/TEGDMA resin cement. Resin cement formulation and hydrofluoric acid concentrations can interfere with the immediate and long-term glass-ceramic bond strength to dentin.
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Affiliation(s)
- Daniel Sundfeld
- Ingá University Center - UNINGÁ, School of Dentistry, Department of Restorative Dentistry and Prosthodontics, Maringá, PR, Brazil
| | - Alan Rodrigo Muniz Palialol
- Universidade Estadual de Campinas - Unicamp, Piracicaba Dental School, Department of Restorative Dentistry, Piracicaba, SP, Brazil
| | - Ana Paula Piovesan Fugolin
- Oregon Health & Science University - OHSU, Department of Restorative Dentistry, Division of Biomaterials and Biomechanics, Portland, Oregon, United States
| | - Gláucia Maria Bovi Ambrosano
- Universidade Estadual de Campinas - Unicamp, Piracicaba Dental School, Department of Social Dentistry, Piracicaba, SP, Brazil
| | - Lourenço Correr-Sobrinho
- Universidade Estadual de Campinas - Unicamp, Piracicaba Dental School, Department of Restorative Dentistry, Piracicaba, SP, Brazil
| | - Luis Roberto Marcondes Martins
- Universidade Estadual de Campinas - Unicamp, Piracicaba Dental School, Department of Restorative Dentistry, Piracicaba, SP, Brazil
| | - Carmem Silvia Pfeifer
- Oregon Health & Science University - OHSU, Department of Restorative Dentistry, Division of Biomaterials and Biomechanics, Portland, Oregon, United States
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Puppin-Rontani J, Sundfeld D, Costa AR, Correr AB, Puppin-Rontani RM, Borges GA, Sinhoreti M, Correr-Sobrinho L. Effect of Hydrofluoric Acid Concentration and Etching Time on Bond Strength to Lithium Disilicate Glass Ceramic. Oper Dent 2017; 42:606-615. [PMID: 28708007 DOI: 10.2341/16-215-l] [Citation(s) in RCA: 36] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
The aim of this study was to evaluate the influence of different concentrations of hydrofluoric acid (HF) associated with varied etching times on the microshear bond strength (μSBS) of a resin cement to a lithium disilicate glass ceramic. Two hundred seventy-five ceramic blocks (IPS e.max Press [EMX], Ivoclar Vivadent), measuring 8 mm × 3 mm thickness, were randomly distributed into five groups according to the HF concentrations (n=50): 1%, 2.5%, 5%, 7.5%, and 10%. Further random distribution into subgroups was performed according to the following etching times (n=10): 20, 40, 60, 120, and 20 + 20 seconds. After etching, all blocks were treated with a silane coupling agent followed by a thin layer of an unfilled resin. Three resin cement cylinders (∅=1 mm) were made on each EMX surface, which was then stored in deionized water at 37°C for 24 hours before testing. The μSBS was in a universal testing machine at a crosshead speed of 1 mm/min until failure. Data were submitted to two-way analysis of variance, and multiple comparisons were performed using the Tukey post hoc test (α=0.05). One representative EMX sample was etched according to the description of each subgroup and evaluated using scanning electron microscopy for surface characterization. The HF concentrations of 5%, 7.5%, and 10% provided significantly higher μSBS values than 1% and 2.5% (p<0.05), regardless of the etching times. For 1% and 2.5% HF, the etching times from 40 to 120 seconds increased the μSBS values compared with 20 seconds (p<0.05), but etching periods did not differ within the 5%, 7.5%, and 10% HF groups (p>0.05). The effect of re-etching was more evident for 1% and 2.5% HF (p<0.05). Different HF concentrations/etching times directly influenced the bond strength and surface morphology of EMX.
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