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Synarellis A, Kouros P, Koulaouzidou E, Strakas D, Koliniotou-Koumpia E. In vitro microleakage of class v composite restorations prepared by Er,Cr:YSGG laser and carbide bur. BALKAN JOURNAL OF DENTAL MEDICINE 2017. [DOI: 10.1515/bjdm-2017-0004] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Abstract
Background: The aim of this in vitro study was to compare the degree of microleakage on enamel and dentin margins of class V cavities prepared with either a high-speed drill or an Er,Cr:YSGG laser (2780 nm) and to associate their use with a beveling method for the margin. Method and Materials: Sixty bovine incisors were randomly distributed into three groups. Group 1 (G1) cavities were laser prepared and bur beveled, group 2 (G2) cavities were bur prepared and beveled, while cavities of group 3 (G3) were laser prepared and beveled. Cavities were restored with selective enamel etching, using the same bonding agent and nano-hybrid resin composite for all groups. After thermocycling, microleakage was assessed using a methylene blue dye penetration method. Results: Statistical analysis (Mann-Whitney, Kruskal-Wallis and post-hoc Dunn’s multiple comparison tests) demonstrated significantly higher microleakage for dentin compared to enamel margins in G1. Enamel margin microleakage was found to be significantly higher at G3 compared to G1 (p=0.032) and G2 (p=0.001), while no significant differences were found between G1 and G2 (p=0.850). Regarding dentin margins, G2 group performed significantly better than G1 and G3 (p<<0.001), while there was no significant difference among G1 and G3 scores (p=1.000). Conclusions: The conventional cavity preparation method seems to perform better in terms of microleakage than the Er,Cr;YSGG laser. Laser-prepared cavities could perform better in terms of microleakage if an additional step of enamel bur-beveling is performed prior to restoration.
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152
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Effects of enamel sealing on shear bond strength and the adhesive remnant index : Study of three fluoride-releasing adhesives in combination with metal and ceramic brackets. J Orofac Orthop 2016; 78:1-10. [PMID: 27896419 DOI: 10.1007/s00056-016-0065-x] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/17/2015] [Accepted: 06/27/2016] [Indexed: 10/20/2022]
Abstract
OBJECTIVES Selected combinations of materials were used to create tooth-adhesive-bracket complexes to evaluate shear bond strength (SBS) and the adhesive remnant index (ARI) with regard to enamel sealing. METHODS Four adhesive systems also appropriate for use as enamel sealants were combined with four bracket types, resulting in 16 adhesive-bracket combinations, each of which was tested on 15 permanent bovine incisors. Sealant-adhesives included two recently introduced fluoride-releasing systems (Riva bond LC® and go!®), one established primer (Opal® Seal™), and one commonly used adhesive as control (Transbond™ XT). Brackets included two metal (discovery® by Dentaurum and Sprint®) and two ceramic (discovery® pearl and GLAM®) systems. After embedding the bovine teeth, bonding the brackets to their surface, and storing the resultant samples as per DIN 13990-2 with modifications, an SBS test was performed by applying the shear force directly at the bracket base in an incisocervical direction. Then the ARI scores were determined. RESULTS Discovery® + Transbond™ XT yielded the highest (47.2 MPa) and GLAM® + go!® the lowest (17.0 MPa) mean SBS values. Significant differences (p < 0.0001) were found between metal and ceramic brackets of the same manufacturers (Dentaurum and Forestadent). Our ratings of the failure modes upon debonding predominantly yielded ARI 0 or 1. The high SBS values and low ARI scores observed with discovery® + Transbond XT™ were reflected in a high rate of enamel fracture, which occurred on 11 of the 15 tooth specimens in this group. CONCLUSIONS All sealant-bracket combinations were found to yield levels of SBS adequate for clinical application. SBS values and ARI scores varied significantly depending on which sealant-brackets were used.
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153
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Schmidlin P, Zobrist K, Attin T, Wegehaupt F. In vitro re-hardening of artificial enamel caries lesions using enamel matrix proteins or self-assembling peptides. J Appl Oral Sci 2016; 24:31-6. [PMID: 27008255 PMCID: PMC4775007 DOI: 10.1590/1678-775720150352] [Citation(s) in RCA: 47] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/11/2015] [Accepted: 11/02/2015] [Indexed: 02/20/2023] Open
Abstract
Objectives To assess the re-hardening potential of enamel matrix derivatives (EMD) and self-assembling peptides in vitro, hypothesizing that these materials may increase the mineralization of artificial carious lesions and improve hardness profiles. Material and Methods Forty-eight enamel samples were prepared from extracted bovine lower central incisors. After embedding and polishing, nail varnish was applied, leaving a defined test area. One third of this area was covered with a flowable composite (non-demineralized control). The remaining area was demineralized in an acidic buffer solution for 18 d to simulate a carious lesion. Half the demineralized area was then covered with composite (demineralized control), while the last third was left open for three test and one control treatments: (A) Application of enamel-matrix proteins (EMD - lyophilized protein fractions dissolved in acetic acid, Straumann), (B) self-assembling peptides (SAP, Curodont), or (C) amine fluoride solution (Am-F, GABA) for 5 min each. Untreated samples (D) served as control. After treatment, samples were immersed in artificial saliva for four weeks (remineralization phase) and microhardness (Knoop) depth profiles (25-300 µm) were obtained at sections. Two-way ANOVA was calculated to determine differences between the areas (re-hardening or softening). Results Decalcification resulted in significant softening of the subsurface enamel in all groups (A-D). A significant re-hardening up to 125 µm was observed in the EMD and SAP groups. Conclusions This study showed that EMD and SAP were able to improve the hardness profiles when applied to deep demineralized artificial lesions. However, further research is needed to verify and improve this observed effect.
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Affiliation(s)
- Patrick Schmidlin
- Clinic of Preventive Dentistry, Periodontology and Cariology, Center of Dental Medicine, University of Zurich, Zurich, Switzerland
| | - Katja Zobrist
- Clinic of Preventive Dentistry, Periodontology and Cariology, Center of Dental Medicine, University of Zurich, Zurich, Switzerland
| | - Thomas Attin
- Clinic of Preventive Dentistry, Periodontology and Cariology, Center of Dental Medicine, University of Zurich, Zurich, Switzerland
| | - Florian Wegehaupt
- Clinic of Preventive Dentistry, Periodontology and Cariology, Center of Dental Medicine, University of Zurich, Zurich, Switzerland
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154
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Kotaku M, Murayama R, Shimamura Y, Takahashi F, Suzuki T, Kurokawa H, Miyazaki M. Evaluation of the effects of fluoride-releasing varnish on dentin demineralization using optical coherence tomography. Dent Mater J 2016; 33:648-55. [PMID: 25273044 DOI: 10.4012/dmj.2014-072] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
Effects of a fluoride-releasing varnish containing surface reaction-type prereacted glass ionomer (S-PRG) filler on dentin demineralization were examined using optical coherence tomography. Bovine incisors that were sliced and treated with undersaturated 0.1 M lactic acid buffer solution (DE group). A thin film of varnish-containing S-PRG filler was applied before demineralization (PRG group). Control was maintained in artificial saliva. Using optical coherence tomography of selected locations on the dentin surface, peak intensity (dB) and width (μm) at 1/e(2) were obtained and integrated values calculated. Although alterations in integrated values were different in each group, there was a slight but not significant increase in those for the control group and a slight but significant increase for the De group. For the PRG group, integrated values were doubled seven days after experiment initiation, followed by a significant increase. Fluoride-releasing varnish containing S-PRG fillers prevented dentin demineralization as detected by optical coherence tomography.
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Affiliation(s)
- Mayumi Kotaku
- Department of Operative Dentistry, Nihon University School of Dentistry
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155
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Endodontic drug delivery for root surface disinfection: a laboratory feasibility evaluation. Clin Oral Investig 2016; 20:607-13. [DOI: 10.1007/s00784-015-1538-9] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/25/2015] [Accepted: 07/16/2015] [Indexed: 12/11/2022]
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156
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Oliveira M, Fernández E, Bortolatto J, Oliveira Junior O, Bandeca M, Khajotia S, Florez F. Optical Dental Whitening Efficacy of Blue Covarine Toothpaste in Teeth Stained by Different Colors. J ESTHET RESTOR DENT 2016; 28 Suppl 1:S68-77. [PMID: 26990460 DOI: 10.1111/jerd.12204] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
Abstract
OBJECTIVE Evaluate the immediate and cumulative optical whitening efficacy of a blue covarine toothpaste. MATERIALS AND METHODS 180 bovine tooth specimens with similar shade (ΔE < 3.5) were staining of different beverage: black tea(BT), green tea (GT), red wine (RW), orange soda (OS), and brazilian açai juice (AJ), and then submitted to tooth brushing with a blue covarine toothpaste (Op) or a control abrasive toothpaste (Ab). The whitening effect was evaluated at baseline (B), after staining (S), after 1 day (1D) and 7 days of cumulative use of toothpastes (7D). The color shade chances were assessment by Vita Easyshade reflectance spectroscope and the data of CIELab color coordinates (L*, a*, and b*), color difference (ΔE) and the whiteness index optimized (WIO), were analyzed by two-way mixed analysis of variance (ANOVA) for repeated measures and Bonferroni-corrected t-tests (α = 0.05). RESULTS The analysis showed statistically significant differences before and after staining by colored beverages (p < 0.05), but no differences were found due to the action of toothpaste (p > 0.05), in the CIELab coordinates, ΔE and WIO index. CONCLUSIONS The use of toothpastes (Op or Ab) reduced the dental staining caused by different colored beverage, but the whitening effect of blue covarine toothpaste could not be confirmed (p > 0.05).
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Affiliation(s)
- Morgana Oliveira
- Department of Operative Dentistry, College of Dentistry, University Estadual Paulista-UNESP, Brazil
| | - Eduardo Fernández
- Department of Restorative Dentistry, Faculty of Dentistry, University of Chile
| | - Janaína Bortolatto
- Department of Operative Dentistry, College of Dentistry, University Estadual Paulista-UNESP, Brazil
| | - Osmir Oliveira Junior
- Department of Operative Dentistry, College of Dentistry, University Estadual Paulista-UNESP, Brazil
| | | | - Sharukh Khajotia
- Department of Dental Materials, College of Dentistry, University of Oklahoma Health Sciences Center, USA
| | - Fernando Florez
- Department of Dental Materials, College of Dentistry, University of Oklahoma Health Sciences Center, USA
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157
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Methodology for Morphometric Analysis of Modern Human Contralateral Premolars. J Comput Assist Tomogr 2016; 40:617-25. [DOI: 10.1097/rct.0000000000000417] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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158
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Evaluation of Osteogenic and Cementogenic Potential of Periodontal Ligament Fibroblast Spheroids Using a Three-Dimensional In Vitro Model of Periodontium. Int J Dent 2015; 2015:605813. [PMID: 26633971 PMCID: PMC4655058 DOI: 10.1155/2015/605813] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/10/2015] [Revised: 10/02/2015] [Accepted: 10/11/2015] [Indexed: 12/02/2022] Open
Abstract
The aim of this study was to develop a three-dimensional in vitro model of periodontium to investigate the osteogenic and cementogenic differentiation potential of the periodontal ligament fibroblast (PDLF) spheroids within a dentin-membrane complex. PDLFs were cultured in both spheroid forms and monolayers and were seeded onto two biological collagen-based and synthetic membranes. Cell-membrane composites were then transferred onto dentin slices with fibroblasts facing the dentin surface and further cultured for 20 days. The composites were then processed for histology and immunohistochemical analyses for osteocalcin, Runx2, periostin, and cementum attachment protein (CAP). Both membranes seeded with PDLF-derived cells adhered to dentin and fibroblasts were present at the dentin interface and spread within both membranes. All membrane-cell-dentine composites showed positive staining for osteocalcin, Runx2, and periostin. However, CAP was not expressed by any of the tissue composites. It can be concluded that PDLFs exhibited some osteogenic potential when cultured in a 3D matrix in the presence of dentin as shown by the expression of osteocalcin. However the interaction of cells and dentin in this study was unable to stimulate cementum formation. The type of membrane did not have a significant effect upon differentiation, but fibroblast seeded-PGA membrane demonstrated better attachment to dentin than the collagen membrane.
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159
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Fagundes NCF, Cardoso MAG, Miranda MSL, Silva RDB, Teixeira FB, Nogueira BCL, Nogueira BML, de Melo SES, da Costa NMM, Lima RR. Morphological aspects and physical properties of enamel and dentine of Sus domesticus: A tooth model in laboratory research. Ann Anat 2015; 202:71-7. [PMID: 26434756 DOI: 10.1016/j.aanat.2015.08.007] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/13/2015] [Revised: 08/13/2015] [Accepted: 08/24/2015] [Indexed: 11/19/2022]
Abstract
This study aims to describe and analyze morphological and physical properties of deciduous teeth of Sus domesticus. Ultrastructural analysis, mineral composition and microhardness of enamel and dentine tissues were performed on 10 skulls of S. domesticus. External anatomic characteristics and the internal anatomy of the teeth were also described. Data regarding microhardness and ultrastructural analysis were subjected to statistical tests. For ultrastructural analysis, we used the analysis of variance (ANOVA) with Tukey's post hoc (p≤0.05) test. In the analysis of microhardness, the difference between the enamel and dentine tissues was analyzed by a Student's t test. Values were expressed as mean with standard error. The results of ultrastructural analysis showed the presence of an enamel prism pattern. A dentinal tubule pattern was also observed, with a larger diameter in the pulp chamber and the cervical third, in comparison to middle and apical thirds. We observed an average microhardness of 259.2kgf/mm(2) for enamel and 55.17kgf/mm(2) for dentine. In porcine enamel and dentine, the chemical elements Ca and P showed the highest concentration. The analysis of internal anatomy revealed the presence of a simple root canal system and the occurrence of main canals in the roots. The observed features are compatible with the functional demand of these animals, following a pattern very similar to that seen in other groups of mammals, which can encourage the development of research using dental elements from the pig as a substitute for human teeth in laboratory research.
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Affiliation(s)
- Nathalia Carolina Fernandes Fagundes
- Laboratory of Functional and Structural Biology, Institute of Biological Sciences, Federal University of Pará, Street Augusto Corrêa n. 1, Guamá, Belém-Pará 66075-900, Brazil
| | - Miquéias André Gomes Cardoso
- Laboratory of Functional and Structural Biology, Institute of Biological Sciences, Federal University of Pará, Street Augusto Corrêa n. 1, Guamá, Belém-Pará 66075-900, Brazil
| | - Mayara Sabrina Luz Miranda
- Laboratory of Functional and Structural Biology, Institute of Biological Sciences, Federal University of Pará, Street Augusto Corrêa n. 1, Guamá, Belém-Pará 66075-900, Brazil
| | - Raira de Brito Silva
- Laboratory of Functional and Structural Biology, Institute of Biological Sciences, Federal University of Pará, Street Augusto Corrêa n. 1, Guamá, Belém-Pará 66075-900, Brazil
| | - Francisco Bruno Teixeira
- Laboratory of Functional and Structural Biology, Institute of Biological Sciences, Federal University of Pará, Street Augusto Corrêa n. 1, Guamá, Belém-Pará 66075-900, Brazil
| | - Bárbara Catarina Lima Nogueira
- Laboratory of Functional and Structural Biology, Institute of Biological Sciences, Federal University of Pará, Street Augusto Corrêa n. 1, Guamá, Belém-Pará 66075-900, Brazil
| | - Brenna Magdalena Lima Nogueira
- Laboratory of Functional and Structural Biology, Institute of Biological Sciences, Federal University of Pará, Street Augusto Corrêa n. 1, Guamá, Belém-Pará 66075-900, Brazil
| | - Sara Elisama Silva de Melo
- Laboratory of Functional and Structural Biology, Institute of Biological Sciences, Federal University of Pará, Street Augusto Corrêa n. 1, Guamá, Belém-Pará 66075-900, Brazil
| | - Natacha Malu Miranda da Costa
- Laboratory of Functional and Structural Biology, Institute of Biological Sciences, Federal University of Pará, Street Augusto Corrêa n. 1, Guamá, Belém-Pará 66075-900, Brazil
| | - Rafael Rodrigues Lima
- Laboratory of Functional and Structural Biology, Institute of Biological Sciences, Federal University of Pará, Street Augusto Corrêa n. 1, Guamá, Belém-Pará 66075-900, Brazil.
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160
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Grychtol S, Viergutz G, Pötschke S, Bowen WH, Hoth-Hannig W, Leis B, Umanskaya N, Hannig M, Hannig C. Enzymes in the in-situ pellicle of children with different caries activity. Eur J Oral Sci 2015; 123:319-326. [DOI: 10.1111/eos.12207] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 07/15/2015] [Indexed: 11/29/2022]
Affiliation(s)
- Susann Grychtol
- Clinic of Operative Dentistry; Medical Faculty Carl Gustav Carus; Technische Universität Dresden; Dresden Germany
| | - Gabriele Viergutz
- Clinic of Operative Dentistry; Medical Faculty Carl Gustav Carus; Technische Universität Dresden; Dresden Germany
| | - Sandra Pötschke
- Clinic of Operative Dentistry; Medical Faculty Carl Gustav Carus; Technische Universität Dresden; Dresden Germany
| | - William H. Bowen
- School of Medicine and Dentistry; University of Rochester Medical Center; Rochester NY USA
| | - Wiebke Hoth-Hannig
- Clinic of Operative Dentistry, Periodontology and Preventive Dentistry; University Hospital; Saarland University; Homburg/Saar Germany
| | - Birgit Leis
- Clinic of Operative Dentistry, Periodontology and Preventive Dentistry; University Hospital; Saarland University; Homburg/Saar Germany
| | - Natalia Umanskaya
- Clinic of Operative Dentistry, Periodontology and Preventive Dentistry; University Hospital; Saarland University; Homburg/Saar Germany
| | - Matthias Hannig
- Clinic of Operative Dentistry, Periodontology and Preventive Dentistry; University Hospital; Saarland University; Homburg/Saar Germany
| | - Christian Hannig
- Clinic of Operative Dentistry; Medical Faculty Carl Gustav Carus; Technische Universität Dresden; Dresden Germany
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161
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Zaugg LK, Lenherr P, Zaugg JB, Weiger R, Krastl G. Influence of the bleaching interval on the luminosity of long-term discolored enamel-dentin discs. Clin Oral Investig 2015; 20:451-8. [PMID: 26254597 DOI: 10.1007/s00784-015-1545-x] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/10/2015] [Accepted: 07/20/2015] [Indexed: 11/28/2022]
Abstract
OBJECTIVES The aim of this study is to investigate the influence of changing the sodium perborate-tetrahydrate (PBS-4) at a 4-day interval versus no change after 16 days of internal bleaching. MATERIALS AND METHODS Two hundred and ten bovine enamel-dentin discs were discolored for 3.5 years with 14 different endodontic materials. All groups with a discoloring index of ∆E (mean) ≥ 5.5 were included in the present investigation: ApexCal (APCA), MTA white + blood (WMTA+BL), Portland cement + blood (PC+BL), blood (BL), MTA gray (GMTA), MTA gray + blood (GMTA+BL), Ledermix (LED), and triple antibiotic paste containing minocycline (3Mix). Fourteen specimens of each group were randomly assigned into two treatment groups: (1) no change of the PBS-4 (n = 7); (2) change of the PBS-4 every 4 days (n = 7). Color measurements were taken at 10 different time intervals and the L*a*b* values were recorded with a spectrophotometer (VITA Easyshade® compact). RESULTS In the group 3Mix, significantly better results were achieved by changing the bleaching agent every 4 days (P = 0.0049; q = 0.04), while the group WMTA+BL indicated better results by no change of the bleaching agent (P = 0.0222, q = 0.09). All remaining groups showed no statistical difference between the two treatment procedures. CONCLUSIONS Moderate discolorations can be successfully treated without changing the bleaching agent over a period of 16 days. Changing the sodium perborate-tetrahydrate every 4 days is preferred in case of severe discolored enamel-dentin discs only. CLINICAL RELEVANCE This approach may offer a reduced number of clinical appointments and a secondary cost reduction to the patient.
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Affiliation(s)
- Lucia K Zaugg
- Department of Periodontology, Endodontology and Cariology, University of Basel, Hebelstrasse 3, 4056, Basel, Switzerland.
| | - Patrik Lenherr
- Department of Reconstructive Dentistry and Temporomandibular Disorders, University of Basel, Hebelstrasse 3, 4056, Basel, Switzerland
| | - Judith B Zaugg
- European Molecular Biology Laboratory, Computational and Structural Biology Unit, Meyerhofstrasse 1, 69117, Heidelberg, Germany
| | - Roland Weiger
- Department of Periodontology, Endodontology and Cariology, University of Basel, Hebelstrasse 3, 4056, Basel, Switzerland
| | - Gabriel Krastl
- Department of Conservative Dentistry and Periodontology, University of Würzburg, Pleicherwall 2, 97070, Würzburg, Germany
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162
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Costa BM, Iwamoto AS, Puppin-Rontani RM, Pascon FM. Comparative Analysis of Root Dentin Morphology and Structure of Human Versus Bovine Primary Teeth. MICROSCOPY AND MICROANALYSIS : THE OFFICIAL JOURNAL OF MICROSCOPY SOCIETY OF AMERICA, MICROBEAM ANALYSIS SOCIETY, MICROSCOPICAL SOCIETY OF CANADA 2015; 21:689-694. [PMID: 25953138 DOI: 10.1017/s1431927615000434] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
This study evaluated the structural and morphological differences between human and bovine primary root canals. Primary human maxillary central incisors (H) (n=9) and primary bovine incisors (B) (n=9) were selected. The roots were sectioned in the vestibular-lingual direction, planed and delimited in cervical, middle, and apical thirds. Tubule density (number of tubules per mm2) and diameter were analyzed by scanning electron microscopy (1,000 and 5,000×) using Image J 1.47 software. Data were submitted to two-way repeated measures ANOVA and Tukey tests (α=0.05). The highest tubule density was observed for B (28.527±1.717 mm2) compared with H (15.931±0.170 mm2) (p<0.01). Regarding root thirds, the cervical third presented a greater tubule density (26.417±11.654 mm2) than the apical third (17.999±5.873 mm2). The diameter of the dentin tubules was not different for cervical (3.50±0.08 µm), middle (3.45±0.30 µm) and apical thirds (3.42±0.33 µm) and substrate (H-3.29±0.14 µm; B-3.63±0.06 µm). It could be concluded that: (1) the radicular dentin structure of human and bovine primary teeth and root thirds differ in terms of the tubule density; (2) the radicular dentin morphology of human and bovine primary teeth and root thirds are similar in terms of the diameter of the dentin tubules.
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Affiliation(s)
- Bruna M Costa
- Pediatric Dentistry Department,Piracicaba Dental School,University of Campinas,Av. Limeira, 901,Piracicaba,SP 13414-903,Brazil
| | - Alexsandra S Iwamoto
- Pediatric Dentistry Department,Piracicaba Dental School,University of Campinas,Av. Limeira, 901,Piracicaba,SP 13414-903,Brazil
| | - Regina M Puppin-Rontani
- Pediatric Dentistry Department,Piracicaba Dental School,University of Campinas,Av. Limeira, 901,Piracicaba,SP 13414-903,Brazil
| | - Fernanda M Pascon
- Pediatric Dentistry Department,Piracicaba Dental School,University of Campinas,Av. Limeira, 901,Piracicaba,SP 13414-903,Brazil
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163
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Wang Y, Xiao S, Ma D, Huang X, Cai Z. Minimizing Concentration of Sodium Hypochlorite in Root Canal Irrigation by Combination of Ultrasonic Irrigation with Photodynamic Treatment. Photochem Photobiol 2015; 91:937-41. [PMID: 25892274 DOI: 10.1111/php.12459] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/20/2014] [Accepted: 04/13/2015] [Indexed: 12/13/2022]
Affiliation(s)
- Yanhuang Wang
- School and Hospital of Stomatology; Fujian Medical University; Fuzhou Fujian China
- Key Laboratory of Stomatology (FMU); Fujian Province University; Fuzhou Fujian China
| | - Suli Xiao
- School and Hospital of Stomatology; Fujian Medical University; Fuzhou Fujian China
- Key Laboratory of Stomatology (FMU); Fujian Province University; Fuzhou Fujian China
| | - Dianfu Ma
- School and Hospital of Stomatology; Fujian Medical University; Fuzhou Fujian China
- Fujian Anxi County Hospital; Quanzhou Fujian China
| | - Xiaojing Huang
- School and Hospital of Stomatology; Fujian Medical University; Fuzhou Fujian China
- Key Laboratory of Stomatology (FMU); Fujian Province University; Fuzhou Fujian China
| | - Zhiyu Cai
- School and Hospital of Stomatology; Fujian Medical University; Fuzhou Fujian China
- Department of Stomatology; Fujian Medical University Union Hospital; Fuzhou Fujian China
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164
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Okulus Z, Strzemiecka B, Czarnecka B, Buchwald T, Voelkel A. Surface energy of bovine dentin and enamel by means of inverse gas chromatography. MATERIALS SCIENCE & ENGINEERING. C, MATERIALS FOR BIOLOGICAL APPLICATIONS 2015; 49:382-389. [DOI: 10.1016/j.msec.2015.01.038] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/14/2014] [Revised: 12/18/2014] [Accepted: 01/06/2015] [Indexed: 10/24/2022]
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165
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Teruel JDD, Alcolea A, Hernández A, Ruiz AJO. Comparison of chemical composition of enamel and dentine in human, bovine, porcine and ovine teeth. Arch Oral Biol 2015; 60:768-75. [PMID: 25766469 DOI: 10.1016/j.archoralbio.2015.01.014] [Citation(s) in RCA: 154] [Impact Index Per Article: 17.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/30/2014] [Revised: 12/04/2014] [Accepted: 01/31/2015] [Indexed: 11/16/2022]
Abstract
OBJECTIVE The aim of this paper was to compare the chemical composition of human teeth with other mammal species that are likely candidates for replacing them in studies that test dental material. DESIGN Dentine and enamel fragments extracted from 400 sound human, bovine, porcine and ovine - 100 teeth per species - incisors and molars were mechanically ground up to a final particle size of less than 100 μm. C/N analysis, thermogravimetric analysis coupled to mass spectrometry (TG-MS), and wavelength dispersive X-ray fluorescence (WDXRF) were used to analyse the samples' composition. RESULTS Elemental analysis showed more organic carbon and nitrogen in dentine than in enamel. Human enamel was the most highly mineralised, with C and N values close to hydroxyapatite. Bovine dentine and enamel were the most similar to human. TG-MS: in all species, enamel contained less carbon and organic matter than dentine. Thermal decomposition of human enamel showed great similarity to synthetic hydroxyapatite, and large differences from bovine, ovine and porcine enamel. Thermal decomposition showed the greatest similarity between human and bovine dentine. WDXRF Dentine contained larger quantities of Mg, S, Sr and Zn than enamel. Enamel contained larger quantities of P, Ca, Cl, Cu, K and Ca/P ratio than dentine. Human enamel and dentine contained a higher Ca/P ratio, larger quantities of Cl and Cu and lower quantities of Mg, S, Zn than the animal species. CONCLUSIONS Elemental analysis, TG-MS and WDXRF have shown that human and bovine enamel and dentine show the greatest similarity among the species analysed.
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Affiliation(s)
- Juan de Dios Teruel
- Department of Integral Pediatric Dentistry, Faculty of Medicine, University of Murcia, Hospital Morales Meseguer, 2ª planta, C/Marqués de los Vélez s/n, 30008 Murcia, Spain
| | - Alberto Alcolea
- Servicio de Apoyo a la Investigación Tecnológica, Universidad Politécnica de Cartagena, 30202 Cartagena, Murcia, Spain
| | - Ana Hernández
- Department of Integral Pediatric Dentistry, Faculty of Medicine, University of Murcia, Hospital Morales Meseguer, 2ª planta, C/Marqués de los Vélez s/n, 30008 Murcia, Spain
| | - Antonio José Ortiz Ruiz
- Department of Integral Pediatric Dentistry, Faculty of Medicine, University of Murcia, Hospital Morales Meseguer, 2ª planta, C/Marqués de los Vélez s/n, 30008 Murcia, Spain.
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166
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Bühler J, Amato M, Weiger R, Walter C. A systematic review on the effects of air polishing devices on oral tissues. Int J Dent Hyg 2015; 14:15-28. [DOI: 10.1111/idh.12120] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 11/27/2014] [Indexed: 01/23/2023]
Affiliation(s)
- J Bühler
- Department of Periodontology, Endodontology and Cariology; School of Dental Medicine; University of Basel; Basel Switzerland
| | - M Amato
- Department of Periodontology, Endodontology and Cariology; School of Dental Medicine; University of Basel; Basel Switzerland
| | - R Weiger
- Department of Periodontology, Endodontology and Cariology; School of Dental Medicine; University of Basel; Basel Switzerland
| | - C Walter
- Department of Periodontology, Endodontology and Cariology; School of Dental Medicine; University of Basel; Basel Switzerland
- Department of Oral Surgery; School of Dentistry; University of Birmingham; Birmingham UK
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167
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Evaluation of polymerization shrinkage of dental composites by an optical method. MATERIALS SCIENCE & ENGINEERING. C, MATERIALS FOR BIOLOGICAL APPLICATIONS 2015; 47:70-6. [DOI: 10.1016/j.msec.2014.11.008] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/21/2014] [Revised: 10/23/2014] [Accepted: 11/05/2014] [Indexed: 11/19/2022]
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168
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Soares LES, Santo AMDE. Morphological and chemical comparative analysis of the human and bovine dentin-adhesive layer. MICROSCOPY AND MICROANALYSIS : THE OFFICIAL JOURNAL OF MICROSCOPY SOCIETY OF AMERICA, MICROBEAM ANALYSIS SOCIETY, MICROSCOPICAL SOCIETY OF CANADA 2015; 21:204-213. [PMID: 25434393 DOI: 10.1017/s143192761401366x] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
Micro energy-dispersive X-ray fluorescence spectrometry (µ-EDXRF) and scanning electron microscopy (SEM) were used to evaluate dentin treated with an etch and rinse adhesive (ER) and a self-etch adhesive (SE). Ten human molars (H) and ten bovine anterior teeth (B) were prepared (exposure of dentin and divided in the middle) and allocated into two different adhesion strategy groups per substrate (n=40). µ-EDXRF data and SEM images were obtained before and after treatment. Untreated dentin of both substrates did not differ in terms of Ca (p<0.1503), P (p<0.2986) or Ca/P ratio (p<0.1400). H-SE and B-SE specimens showed reduced P content (p<0.0001; p<0.0002), while H-ER and B-ER specimens showed reduced Ca and P content (p<0.0001; p<0.0001) when compared with untreated specimens. The Ca/P ratio was significantly higher in H-ER and B-ER specimens than in H-SE and B-SE specimens (p<0.0001; p<0.0080). Untreated dentin showed a homogeneous elemental distribution. However, after adhesive treatments, the surface of the dentin showed an irregular demineralization pattern. The resin tags and adhesive layer were shorter in bovine specimens than in human specimens due to morphological differences.
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Affiliation(s)
- Luís Eduardo Silva Soares
- 1Department of Dental Materials and Operative Dentistry,School of Dentistry,University of Vale do Paraíba,UNIVAP,São José dos Campos,SP 12.244-000,Brazil
| | - Ana Maria do Espírito Santo
- 3Departamento de Ciências Exatas e da Terra,Universidade Federal de São Paulo,UNIFESP,Diadema,São Paulo 09972-270,Brazil
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169
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Shimizu Y, Tsujimoto A, Furuichi T, Suzuki T, Tsubota K, Miyazaki M, Platt JA. Influence of Light Intensity on Surface Free Energy and Dentin Bond Strength of Core Build-up Resins. Oper Dent 2015; 40:87-95. [DOI: 10.2341/13-283-l] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
SUMMARY
Objective
We examined the influence of light intensity on surface free energy characteristics and dentin bond strength of dual-cure direct core build-up resin systems.
Methods
Two commercially available dual-cure direct core build-up resin systems, Clearfil DC Core Automix with Clearfil Bond SE One and UniFil Core EM with Self-Etching Bond, were studied. Bovine mandibular incisors were mounted in acrylic resin and the facial dentin surfaces were wet ground on 600-grit silicon carbide paper. Adhesives were applied to dentin surfaces and cured with light intensities of 0 (no irradiation), 200, 400, and 600 mW/cm2. The surface free energy of the adhesives (five samples per group) was determined by measuring the contact angles of three test liquids placed on the cured adhesives. To determine the strength of the dentin bond, the core build-up resin pastes were condensed into the mold on the adhesive-treated dentin surfaces according to the methods described for the surface free energy measurement. The resin pastes were cured with the same light intensities as those used for the adhesives. Ten specimens per group were stored in water maintained at 37°C for 24 hours, after which they were shear tested at a crosshead speed of 1.0 mm/minute in a universal testing machine. Two-way analysis of variance (ANOVA) and a Tukey-Kramer test were performed, with the significance level set at 0.05.
Results
The surface free energies of the adhesive-treated dentin surfaces decreased with an increase in the light intensity of the curing unit. Two-way ANOVA revealed that the type of core build-up system and the light intensity significantly influence the bond strength, although there was no significant interaction between the two factors. The highest bond strengths were achieved when the resin pastes were cured with the strongest light intensity for all the core build-up systems. When polymerized with a light intensity of 200 mW/cm2 or less, significantly lower bond strengths were observed.
Conclusions
The data suggest that the dentin bond strength of core build-up systems are still affected by the light intensity of the curing unit, which is based on the surface free energy of the adhesives. On the basis of the results and limitations of the test conditions used in this study, it appears that a light intensity of >400 mW/cm2 may be required for achieving the optimal dentin bond strength.
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Affiliation(s)
- Y Shimizu
- Yuske Shimizu, DDS, graduate student, Chiyoda-Ku, Japan
| | - A Tsujimoto
- Akimasa Tsujimoto, DDS, PhD, assistant professor, Operative Dentistry, Nihon University School of Dentistry, Tokyo, Japan
| | - T Furuichi
- Tetsuya Furuichi, DDS, graduate student, Chiyoda-Ku, Japan
| | - T Suzuki
- Takayuki Suzuki, DDS, graduate student, Chiyoda-Ku, Japan
| | - K Tsubota
- Keishi Tsubota, DDS, PhD, assistant professor, Chiyoda-Ku, Japan
| | - M Miyazaki
- Masashi Miyazaki DDS, PhD, professor, Operative Dentistry, Nihon University School of Dentistry, Tokyo, Japan
| | - JA Platt
- Jeffrey A Platt, DDS, MS, associate professor, Restorative Dentistry, Indiana University, Indianapolis, IN, USA
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170
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Pantelić DV, Grujić DŽ, Vasiljević DM. Single-beam, dual-view digital holographic interferometry for biomechanical strain measurements of biological objects. JOURNAL OF BIOMEDICAL OPTICS 2014; 19:127005. [PMID: 25517257 DOI: 10.1117/1.jbo.19.12.127005] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/27/2014] [Accepted: 11/10/2014] [Indexed: 06/04/2023]
Abstract
We describe a method for dual-view biomechanical strain measurements of highly asymmetrical biological objects, like teeth or bones. By using a spherical mirror, we were able to simultaneously record a digital hologram of the object itself and the mirror image of its (otherwise invisible) rear side. A single laser beam was sufficient to illuminate both sides of the object, and to provide a reference beam. As a result, the system was mechanically very stable, enabling long exposure times (up to 2 min) without the need for vibration isolation. The setup is simple to construct and adjust, and can be used to interferometrically observe any object that is smaller than the mirror diameter. Parallel data processing on a CUDA-enabled (compute unified device architecture) graphics card was used to reconstruct digital holograms and to further correct image distortion. We used the setup to measure the deformation of a tooth due to mastication forces. The finite-element method was used to compare experimental results and theoretical predictions.
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171
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Sirisha K, Rambabu T, Ravishankar Y, Ravikumar P. Validity of bond strength tests: A critical review-Part II. J Conserv Dent 2014; 17:420-6. [PMID: 25298640 PMCID: PMC4174699 DOI: 10.4103/0972-0707.139823] [Citation(s) in RCA: 80] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/02/2014] [Revised: 05/20/2014] [Accepted: 06/04/2014] [Indexed: 11/21/2022] Open
Abstract
Background: Macro-bond strength tests resulted in cohesive failures and overestimation of bond strengths. To reduce the flaws, micro-bond strength tests were introduced. They are the most commonly used bond-strength tests. Objective: Thus the objective of this review is to critically review the reliability of micro-bond strength tests used to evaluate resin-tooth interface. Data Collection: Relevant articles published between January 1994 and July 2013 were collected from Pubmed database, Google scholar and hand searched journals of Conservative Dentistry, Endodontics and Dental materials. Data Synthesis: Variables that influence the test outcome are categorized into substrate related factors, factors related to specimen properties, specimen preparation and test methodology. Impact of these variables on the test outcome is critically analyzed. Conclusion: Micro-bond tests are more reliable than macro-bond tests. However, no standard format exists for reporting the bond strength tests which could lead to misinterpretation of the data and bonding abilities of adhesives.
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Affiliation(s)
- Kantheti Sirisha
- Departments of Conservative Dentistry and Endodontics, GITAM Dental College and Hospital, Visakhapatnam, Andhra Pradesh, India
| | - Tankonda Rambabu
- Departments of Conservative Dentistry and Endodontics, Vishnu Dental College and Hospital, Bhimavaram, Andhra Pradesh, India
| | - Yalavarthi Ravishankar
- Department of Prosthodontics, GITAM Dental College and Hospital, Visakhapatnam, Andhra Pradesh, India
| | - Pabbati Ravikumar
- Departments of Conservative Dentistry and Endodontics, SIBAR Institute of Dental Sciences, Guntur, Andhra Pradesh, India
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172
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Bühler J, Schmidli F, Weiger R, Walter C. Analysis of the effects of air polishing powders containing sodium bicarbonate and glycine on human teeth. Clin Oral Investig 2014; 19:877-85. [DOI: 10.1007/s00784-014-1317-z] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2014] [Accepted: 09/08/2014] [Indexed: 10/24/2022]
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173
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Zhang L, Tang T, Zhang ZL, Liang B, Wang XM, Fu BP. Improvement of enamel bond strengths for conventional and resin-modified glass ionomers: acid-etching vs. conditioning. J Zhejiang Univ Sci B 2014; 14:1013-24. [PMID: 24190447 DOI: 10.1631/jzus.b1300034] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
OBJECTIVE This study deals with the effect of phosphoric acid etching and conditioning on enamel micro-tensile bond strengths (μTBSs) of conventional and resin-modified glass ionomer cements (GICs/RMGICs). METHODS Forty-eight bovine incisors were prepared into rectangular blocks. Highly-polished labial enamel surfaces were either acid-etched, conditioned with liquids of cements, or not further treated (control). Subsequently, two matching pre-treated enamel surfaces were cemented together with one of four cements [two GICs: Fuji I (GC), Ketac Cem Easymix (3M ESPE); two RMGICs: Fuji Plus (GC), RelyX Luting (3M ESPE)] in preparation for μTBS tests. Pre-treated enamel surfaces and cement-enamel interfaces were analyzed by scanning electron microscopy (SEM). RESULTS Phosphoric acid etching significantly increased the enamel μTBS of GICs/RMGICs. Conditioning with the liquids of the cements produced significantly weaker or equivalent enamel μTBS compared to the control. Regardless of etching, RMGICs yielded stronger enamel μTBS than GICs. A visible hybrid layer was found at certain enamel-cement interfaces of the etched enamels. CONCLUSIONS Phosphoric acid etching significantly increased the enamel μTBSs of GICs/RMGICs. Phosphoric acid etching should be recommended to etch the enamel margins before the cementation of the prostheses such as inlays and onlays, using GICs/RMGICs to improve the bond strengths. RMGICs provided stronger enamel bond strength than GICs and conditioning did not increase enamel bond strength.
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Affiliation(s)
- Ling Zhang
- Hospital of Stomatology Affiliated to Zhejiang University School of Medicine, Hangzhou 310006, China
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174
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Sirisha K, Rambabu T, Shankar YR, Ravikumar P. Validity of bond strength tests: A critical review: Part I. J Conserv Dent 2014; 17:305-11. [PMID: 25125840 PMCID: PMC4127686 DOI: 10.4103/0972-0707.136340] [Citation(s) in RCA: 66] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2014] [Revised: 03/20/2014] [Accepted: 05/04/2014] [Indexed: 11/04/2022] Open
Abstract
Adhesive systems are selected based on their bond strengths achieved while testing in laboratories. These bond strengths can predict the longevity of a restoration to some extent. There were several discrepancies in the reported bond strengths. To critically review the reliability of macro-bond strength tests used to evaluate resin-tooth interface. Relevant literature published between January 1983 and May 2013 was collected from PubMed database, Google scholar, and hand-searched journals of Conservative Dentistry, Endodontics and Dental materials. Variables that influence the test outcome are categorized into substrate-related factors, factors related to specimen properties, preparation of specimens, and test methodology. Impact of these variables on the test outcome is critically analyzed. There is lack of a standard format for reporting the bond strength tests, which could lead to misinterpretation of the data and bonding abilities of adhesives.
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Affiliation(s)
- Kantheti Sirisha
- Department of Conservative Dentistry and Endodontics, GITAM Dental College and Hospital, Visakhapatnam, Andhra Pradesh, India
| | - Tankonda Rambabu
- Departments of Conservative Dentistry and Endodontics, Vishnu Dental College and Hospital, Bhimavaram, Andhra Pradesh, India
| | - Yalavarthi Ravi Shankar
- Department of Prosthodontics, GITAM Dental College and Hospital, Visakhapatnam, Andhra Pradesh, India
| | - Pabbati Ravikumar
- Department of Conservative Dentistry and Endodontics, SIBAR Institute of Dental Sciences, Guntur, Andhra Pradesh, India
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175
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Pirolo R, Mondelli RFL, Correr GM, Gonzaga CC, Furuse AY. Effect of coffee and a cola-based soft drink on the color stability of bleached bovine incisors considering the time elapsed after bleaching. J Appl Oral Sci 2014; 22:534-40. [PMID: 25075672 PMCID: PMC4307768 DOI: 10.1590/1678-775720130578] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/08/2013] [Accepted: 05/28/2014] [Indexed: 11/22/2022] Open
Abstract
UNLABELLED There is no consensus about the waiting time necessary for the patient to start consuming beverages containing colorants again after bleaching. OBJECTIVE To evaluate the influence of beverages with coloring agents on bleached bovine incisors considering the time elapsed after bleaching. MATERIALS AND METHODS Sixty bovine incisors were bleached with 35% hydrogen peroxide for in-office use (Whiteness HP Max) and divided into 10 groups. The color was evaluated with a spectrophotometer (Spectro Shade MICRO) before and after bleaching, employing the CIE-Lab system. After bleaching, the teeth were exposed for 5 min to coffee or cola-based soft drink (CBSD) at different periods after bleaching: 10 min, 1 h, 24 h, 48 h, and 72 h. Color (∆E) and lightness (∆L) variations were obtained from the CIE-Lab coordinates. Data were subjected to two-way ANOVA and Tukey HSD tests (p<0.05). RESULTS Significant differences were observed between groups for both the ∆L and ∆E values (p<0.001). All specimens presented a decrease in brightness (negative ∆L). The highest ∆E values were observed for teeth stained with a CBSD at 10 min and 1 h (4.12 and 4.16, respectively). Teeth pigmented with coffee presented ∆E values below 3.3 units for all evaluation times. CONCLUSION The exposure to coffee after bleaching causes less color changes than the exposure to a CBSD regardless of the time after bleaching.
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Affiliation(s)
| | - Rafael Francisco Lia Mondelli
- Department of Operative Dentistry, Endodontics and Dental Materials, Bauru School of Dentistry, University of São Paulo, Bauru, SP, Brazil
| | | | | | - Adilson Yoshio Furuse
- Department of Operative Dentistry, Endodontics and Dental Materials, Bauru School of Dentistry, University of São Paulo, Bauru, SP, Brazil
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176
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Yim HK, Min JH, Kwon HK, Kim BI. Modification of surface pretreatment of white spot lesions to improve the safety and efficacy of resin infiltration. Korean J Orthod 2014; 44:195-202. [PMID: 25133134 PMCID: PMC4130915 DOI: 10.4041/kjod.2014.44.4.195] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/17/2013] [Revised: 12/17/2013] [Accepted: 01/09/2014] [Indexed: 11/25/2022] Open
Abstract
Objective A low-viscosity resin (infiltrant) was used to inhibit the progression of white spot lesions (WSLs) and resolve associated esthetic issues. An alternative pretreatment was explored to increase the pore volume of the surface layer of the WSLs. Also, the penetration effects of the infiltrant were evaluated for various pretreatments. Methods Sixty two artificial lesions were fabricated on bovine teeth. As a positive control, 15% HCl gel was applied for 120 seconds. Further, 37% H3PO4 gel was applied for 30 seconds using three methods. The samples were divided as follows: H3PO4 only group, H3PO4 sponge group, and H3PO4 brush group. The acid was gently rubbed with the applicators (i.e., a sponge or brush) throughout the application time. To compare the effects of resin infiltration, twenty paired halves of specimens were treated with an infiltrant (ICON®). Results Thicknesses of the removed surface layers and infiltrated areas were evaluated by confocal laser scanning microscope. The positive control and the 37% H3PO4 brush group failed to show significant differences in the removed thickness (p > 0.05); however, the mean percentage of the infiltrated area was higher in the 37% H3PO4 brush group (84.13 ± 7.58%) than the positive control (63.51 ± 7.62%, p < 0.001). Scanning electron microscope observations indicate higher pore volumes for the 37% H3PO4 brush group than for the positive control. Conclusions Application of 37% H3PO4 with a brush for 30 seconds increased the pore volume of WSL surface layers and the percentage of infiltrated areas in comparison to the use of 15% HCl for 120 seconds.
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Affiliation(s)
- Hyun-Kyung Yim
- Department of Preventive Dentistry and Public Oral Health, Brain Korea 21 PLUS Project, College of Dentistry, Yonsei University, Seoul, Korea
| | - Ji-Hyun Min
- Department of Preventive Dentistry and Public Oral Health, Brain Korea 21 PLUS Project, College of Dentistry, Yonsei University, Seoul, Korea
| | - Ho-Keun Kwon
- Department of Preventive Dentistry and Public Oral Health, Brain Korea 21 PLUS Project, College of Dentistry, Yonsei University, Seoul, Korea
| | - Baek-Il Kim
- Department of Preventive Dentistry and Public Oral Health, Brain Korea 21 PLUS Project, College of Dentistry, Yonsei University, Seoul, Korea
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177
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Wang Y, Huang X. Comparative antibacterial efficacy of photodynamic therapy and ultrasonic irrigation against Enterococcus faecalis in vitro. Photochem Photobiol 2014; 90:1084-8. [PMID: 24861937 DOI: 10.1111/php.12293] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/17/2013] [Accepted: 05/21/2014] [Indexed: 11/30/2022]
Abstract
Enterococcus faecalis poses a challenge to the efficacy of traditional root canal disinfection methods. This study was aimed to establish a synergistic root canal disinfection strategy combining ultrasonic irrigation with photodynamic therapy (PDT) together and to test its antibacterial efficacy against E. faecalis. Twenty-seven bovine root canals infected with E. faecalis were randomly divided into three groups and treated with different disinfection methods as follows: ultrasonic irrigation with 2.5% NaOCl, methylene blue (MB)-mediated PDT, or combined ultrasonic irrigation and PDT as described above. Quantification of E. faecalis was performed on the root canals before and immediately after the disinfection treatment. Residual bacteria were determined by counting colony-forming units. Samples were randomly selected from the three groups, and the morphology of residual bacteria inside the dentinal tubules was studied by scanning electron microscopy. The number of surviving E. faecalis in the group treated with the combination method was significantly lower (P < 0.05) than those in the ultrasonic irrigation-treated or PDT-treated groups. Similar results were found in the morphological studies of the three groups. The results of our study highlighted the importance of combination of ultrasonic irrigation and PDT to produce significant antibacterial efficacy against E. faecalis during root canal disinfection.
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Affiliation(s)
- Yanhuang Wang
- School and Hospital of Stomatology, Fujian Medical University, Fuzhou, China
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178
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Ren W, Baig A, Li SK. Passive and Iontophoretic Transport of Fluorides across Enamel In Vitro. J Pharm Sci 2014; 103:1692-700. [DOI: 10.1002/jps.23961] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/21/2014] [Revised: 03/10/2014] [Accepted: 03/11/2014] [Indexed: 11/09/2022]
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Endo H, Kawamoto R, Takahashi F, Takenaka H, Yoshida F, Nojiri K, Takamizawa T, Miyazaki M. Evaluation of a calcium phosphate desensitizer using an ultrasonic device. Dent Mater J 2014; 32:456-61. [PMID: 23719008 DOI: 10.4012/dmj.2012-308] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
This study evaluated the effect of a calcium phosphate desensitizer on the demineralization of bovine dentin by measuring changes in transmitted ultrasonic velocity. Bovine dentin specimens with and without application of desensitizer were immersed in 0.1 M lactic-acid buffer solution (pH 4.75) 10 min twice daily throughout the test period, and stored in artificial saliva solution (pH 7.0) between treatments. The propagation time of longitudinal ultrasonic waves was measured by a pulser-receiver. Data were evaluated using one-way ANOVA followed by Tukey HSD test (α=0.05). The ultrasonic velocity decreased over time in specimens stored in demineralizing solution (3,785-3,462 m/s); however, desensitizer-applied specimens had a significantly higher sonic velocity (3,945-3,990 m/s) than those without application. The calcium phosphate desensitizer appeared to reduce the demineralization of dentin and occluded dentinal tubules.
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Affiliation(s)
- Hajime Endo
- Department of Operative Dentistry, Nihon University School of Dentistry, 1-8-13 Kandasurugadai, Chiyoda-ku, Tokyo 101-8310, Japan
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180
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Nogueira BC, Fernandes PM, Paiva AC, Fagundes NC, Teixeira FB, Lima RR. Avaliação comparativa da ultraestrutura e propriedades físicas do esmalte bovino, bubalino e humano. PESQUISA VETERINÁRIA BRASILEIRA 2014. [DOI: 10.1590/s0100-736x2014000500017] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Este estudo teve como finalidade comparar a morfologia e propriedades físicas da estrutura do esmalte dos dentes bovinos, bubalinos e humanos. A análise deste tecido foi realizada por meio de microscopia eletrônica de varredura, composição mineral, microdureza e rugosidade superficial do esmalte em 41 incisivos bubalinos (Bos taurus indicus), 41 incisivos bovinos (Pelorovis antiques) e 30 incisivos permanentes de humanos. Os resultados mostraram que a ultraestrutura do esmalte revela uma significativa similaridade das espécies estudadas com a encontrada em amostras humanas. No esmalte bovino e bubalino os elementos químicos que apresentaram maior concentração foram: O, Ca e P, justamente os que formam os cristais de hidroxiapatita - Ca10(PO4)6(OH)2. Na microdureza Knoop não houve diferença estatisticamente significante entre as três espécies. Porém, a rugosidade superficial do esmalte bubalino (2,16µm ±0,23) foi significativamente maior quando comparada aos dentes humano (0,36µm ±0,05) e bovino (0,41µm ±0,07). Conclui-se que as características e propriedades do esmalte bovino e bubalino, por meio de análises e testes, apresentou uma morfologia semelhante à de humanos, arquitetura ultraestrutural similar, microdureza e composição mineral equivalente ao tecido dental humano, tornando-se modelos de referência para pesquisas.
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181
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Asano K, Kawamoto R, Iino M, Fruichi T, Nojiri K, Takamizawa T, Miyazaki M. Effect of Pre-reacted Glass-ionomer Filler Extraction Solution on Demineralization of Bovine Enamel. Oper Dent 2014; 39:159-65. [DOI: 10.2341/13-034-l] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
SUMMARY
Objective
To determine the effect of pre-reacted glass-ionomer (PRG) filler extraction solution on the demineralization of bovine enamel by measuring changes in the ultrasound transmission velocity.
Methods
The specimens were prepared by cutting bovine teeth into enamel blocks. The specimens were immersed in buffered lactic acid solution for 10 minutes twice a day, and then stored in artificial saliva. Other specimens were stored in PRG filler extraction solution for 10 minutes, followed by 10-minute immersion in the buffered lactic acid solution twice a day. The propagation time of longitudinal ultrasonic waves was measured by a pulser receiver. Six specimens were used for each condition, and analyses of variance followed by Tukey tests (α=0.05) were done.
Results
No changes in sonic velocity were found for specimens stored in the PRG filler extraction solution, indicating that the PRG extraction solution had an effect on inhibiting the demineralization of bovine enamel.
Conclusions
The results obtained with the use of an ultrasound measurement technique suggested that PRG filler extraction solution has the ability to prevent demineralization of enamel.
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Affiliation(s)
- K Asano
- Kazumasa Asano, DDS, Operative Dentistry, Nihon University School of Dentistry, Chiyoda-Ku, Tokyo, Japan
| | - R Kawamoto
- Ryo Kawamoto, DDS, Operative Dentistry, Nihon University School of Dentistry, Chiyoda-Ku, Tokyo, Japan
| | - M Iino
- Masayoshi Iino, DDS, Operative Dentistry, Nihon University School of Dentistry, Chiyoda-Ku, Tokyo, Japan
| | - T Fruichi
- Tetsuya Fruichi, DDS, Operative Dentistry, Nihon University School of Dentistry, Chiyoda-Ku, Tokyo, Japan
| | - K Nojiri
- Kie Nojiri, DDS, Operative Dentistry, Nihon University School of Dentistry, Chiyoda-Ku, Tokyo, Japan
| | - T Takamizawa
- Toshiki Takamizawa, DDS, PhD, Operative Dentistry, Nihon University School of Dentistry, Chiyoda-Ku, Tokyo, Japan
| | - M Miyazaki
- Masashi Miyazaki, DDS, PhD, Operative Dentistry, Nihon University School of Dentistry, Chiyoda-Ku, Tokyo, Japan
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182
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Degradation in the dentin-composite interface subjected to multi-species biofilm challenges. Acta Biomater 2014; 10:375-83. [PMID: 24008178 DOI: 10.1016/j.actbio.2013.08.034] [Citation(s) in RCA: 68] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/15/2013] [Revised: 08/15/2013] [Accepted: 08/26/2013] [Indexed: 11/23/2022]
Abstract
Oral biofilms can degrade the components in dental resin-based composite restorations, thus compromising marginal integrity and leading to secondary caries. This study investigates the mechanical integrity of the dentin-composite interface challenged with multi-species oral biofilms. While most studies used single-species biofilms, the present study used a more realistic, diverse biofilm model produced directly from plaques collected from donors with a history of early childhood caries. Dentin-composite disks were made using bovine incisor roots filled with Z100(TM) or Filtek(TM) LS (3M ESPE). The disks were incubated for 72 h in paired CDC biofilm reactors, using a previously published protocol. One reactor was pulsed with sucrose, and the other was not. A sterile saliva-only control group was run with sucrose pulsing. The disks were fractured under diametral compression to evaluate their interfacial bond strength. The surface deformation of the disks was mapped using digital image correlation to ascertain the fracture origin. Fracture surfaces were examined using scanning electron microscopy/energy-dispersive X-ray spectroscopy to assess demineralization and interfacial degradation. Dentin demineralization was greater under sucrose-pulsed biofilms, as the pH dropped <5.5 during pulsing, with LS and Z100 specimens suffering similar degrees of surface mineral loss. Biofilm growth with sucrose pulsing also caused preferential degradation of the composite-dentin interface, depending on the composite/adhesive system used. Specifically, Z100 specimens showed greater bond strength reduction and more frequent cohesive failure in the adhesive layer. This was attributed to the inferior dentin coverage by Z100 adhesive, which possibly led to a higher level of chemical and enzymatic degradation. The results suggested that factors other than dentin demineralization were also responsible for interfacial degradation. A clinically relevant in vitro biofilm model was therefore developed, which would effectively allow assessment of the degradation of the dentin-composite interface subjected to multi-species biofilm challenge.
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183
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Zaugg LK, Zitzmann NU, Hauser-Gerspach I, Waltimo T, Weiger R, Krastl G. Antimicrobial activity of short- and medium-term applications of polyhexamethylene biguanide, chlorhexidine digluconate and calcium hydroxide in infected immature bovine teethin vitro. Dent Traumatol 2013; 30:326-31. [DOI: 10.1111/edt.12077] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 06/23/2013] [Indexed: 12/22/2022]
Affiliation(s)
- Lucia K. Zaugg
- Department of Periodontology, Endodontology and Cariology; University of Basel; Basel Switzerland
| | - Nicola U. Zitzmann
- Department of Periodontology, Endodontology and Cariology; University of Basel; Basel Switzerland
- Center of Dental Traumatology; University of Basel; Basel Switzerland
| | - Irmgard Hauser-Gerspach
- Department of Preventive Dentistry and Oral Microbiology; University of Basel; Basel Switzerland
| | - Tuomas Waltimo
- Center of Dental Traumatology; University of Basel; Basel Switzerland
- Department of Preventive Dentistry and Oral Microbiology; University of Basel; Basel Switzerland
| | - Roland Weiger
- Department of Periodontology, Endodontology and Cariology; University of Basel; Basel Switzerland
- Center of Dental Traumatology; University of Basel; Basel Switzerland
| | - Gabriel Krastl
- Department of Periodontology, Endodontology and Cariology; University of Basel; Basel Switzerland
- Center of Dental Traumatology; University of Basel; Basel Switzerland
- Department of Oral Surgery; School of Dentistry; University of Birmingham; Birmingham UK
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184
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Pires PT, Ferreira JC, Oliveira SA, Silva MJ, Melo PR. Effect of ozone gas on the shear bond strength to enamel. J Appl Oral Sci 2013; 21:177-82. [PMID: 23739859 PMCID: PMC3881866 DOI: 10.1590/1678-7757201302362] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/06/2012] [Accepted: 01/25/2013] [Indexed: 11/24/2022] Open
Abstract
Ozone is an important disinfecting agent, however its influence on enamel adhesion has not yet been clarified.
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185
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Shiratsuchi K, Tsujimoto A, Takamizawa T, Furuichi T, Tsubota K, Kurokawa H, Miyazaki M. Influence of warm air-drying on enamel bond strength and surface free-energy of self-etch adhesives. Eur J Oral Sci 2013; 121:370-6. [PMID: 23841790 DOI: 10.1111/eos.12061] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 04/26/2013] [Indexed: 12/01/2022]
Abstract
We examined the effect of warm air-drying on the enamel bond strengths and the surface free-energy of three single-step self-etch adhesives. Bovine mandibular incisors were mounted in self-curing resin and then wet ground with #600 silicon carbide (SiC) paper. The adhesives were applied according to the instructions of the respective manufacturers and then dried in a stream of normal (23°C) or warm (37°C) air for 5, 10, and 20 s. After visible-light irradiation of the adhesives, resin composites were condensed into a mold and polymerized. Ten samples per test group were stored in distilled water at 37°C for 24 h and then the bond strengths were measured. The surface free-energies were determined by measuring the contact angles of three test liquids placed on the cured adhesives. The enamel bond strengths varied according to the air-drying time and ranged from 15.8 to 19.1 MPa. The trends for the bond strengths were different among the materials. The value of the γS⁺ component increased slightly when drying was performed with a stream of warm air, whereas that of the γS⁻ component decreased significantly. These data suggest that warm air-drying is essential to obtain adequate enamel bond strengths, although increasing the drying time did not significantly influence the bond strength.
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Affiliation(s)
- Koji Shiratsuchi
- Department of Operative Dentistry, Nihon University School of Dentistry, Tokyo, Japan
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186
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Giacaman RA, Campos P, Muñoz-Sandoval C, Castro RJ. Cariogenic potential of commercial sweeteners in an experimental biofilm caries model on enamel. Arch Oral Biol 2013; 58:1116-22. [PMID: 23631998 DOI: 10.1016/j.archoralbio.2013.03.005] [Citation(s) in RCA: 41] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/21/2012] [Revised: 02/14/2013] [Accepted: 03/10/2013] [Indexed: 11/19/2022]
Abstract
OBJECTIVE Scarce evidence is available on the cariogenic potential of the widely used commercial sweeteners. The aim of this study was to evaluate the effect of several sweeteners on enamel demineralisation and on the cariogenic properties of Streptococcus mutans biofilms in an artificial caries model. METHODS S. mutans-UA159 biofilms were cultured on bovine enamel slabs and exposed to one of the following commercial sweeteners in tablet or powder form: stevia, sucralose, saccharin, aspartame or fructose. Ten percent sucrose and 0.9% NaCl were used as caries-positive and caries-negative controls, respectively. Slabs/biofilms were exposed to the sweeteners three times per day for 5min each time. After 5 days, biofilms were recovered to determine: biomass, bacterial counts and intra- and extracellular polysaccharides. Surface microhardness was measured before and after the experiment to assess enamel demineralisation, expressed as percentage of surface hardness loss (%SHL). Data were analysed using analysis of variance (ANOVA) and Bonferroni (p<0.05). RESULTS All tested commercial sweeteners, except fructose, showed less enamel demineralisation than sucrose (p<0.05). Only saccharine showed less biomass and intracellular polysaccharides than the rest of the groups (p<0.05). Stevia, sucralose and saccharine reduced the number of viable cells when compared with sucrose (p<0.05). All sugar alternatives reduced extracellular polysaccharide formation when compared with sucrose (p<0.05). CONCLUSIONS Most commercial sweeteners appear to be less cariogenic than sucrose, but still retaining some enamel demineralisation potential. Products containing stevia, sucralose and saccharine showed antibacterial properties and seem to interfere with bacterial metabolism. Further studies are necessary to deepen these findings.
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Affiliation(s)
- Rodrigo A Giacaman
- Cariology Unit, Department of Oral Rehabilitation, University of Talca, Talca, Chile.
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187
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Canbek K, Karbach M, Gottschalk F, Erbe C, Wehrbein H. Evaluation of bovine and human teeth exposed to thermocycling for microleakage under bonded metal brackets. J Orofac Orthop 2013; 74:102-12. [PMID: 23463300 DOI: 10.1007/s00056-012-0123-y] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/08/2012] [Accepted: 07/17/2012] [Indexed: 11/25/2022]
Abstract
INTRODUCTION Bovine teeth are commonly used as substitutes for human teeth in scientific investigations. The present study was performed in vitro with the objective of comparing bovine and human enamel subjected to thermocycling for microleakage beneath metal brackets. MATERIALS AND METHODS A total of 50 bovine and human teeth (25 per group) void of defects or carious decay were extracted and stored in chloramine B (0.5%). A light-curing adhesive (Transbond™ XT) was used as instructed by the manufacturer (3M Unitek, Monrovia, CA, USA) to bond a metal bracket (discovery®; Dentaurum, Ispringen, Germany) to the surface of each tooth following 30 s of enamel etching (phosphoric acid 35%). After 24 h of dye penetration in methylene blue (0.5%), the cervical and incisal bracket surfaces were analyzed by light microscopy for excess bonding material, dye penetration, and microleakage at the bracket-adhesive and adhesive-enamel interfaces. Staining and evaluation was repeated after thermocycling (5000 cycles at 5/55 °C). RESULTS Before thermocycling, the number of human teeth showing marginal gaps was one-third the number of bovine teeth (p<0.001). After thermocycling, the distribution of gaps was similar (p=0.180). The adhesive-enamel interface was most frequently affected (on 74% of human and 64% of bovine teeth). No dye penetration in either group after examining a horizontal slice through the bracket basis was observed. CONCLUSION Immediately after bonding, less microleakage was observed around the base of metal brackets on human than bovine teeth. These marginal gaps were, however, superficial in both groups, none of them involving deep penetration of dye under the bracket base.
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Affiliation(s)
- Kerem Canbek
- Policlinic of Orthodontics, Johannes Gutenberg University, Mainz, Germany.
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188
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Kuper N, Opdam N, Bronkhorst E, Ruben J, Huysmans M. Hydrodynamic Flow through Loading and in vitro Secondary Caries Development. J Dent Res 2013; 92:383-7. [DOI: 10.1177/0022034513481040] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022] Open
Abstract
This in vitro study investigated the effect of hydrodynamic flow through mechanical loading on development of secondary caries lesions. Forty-eight bovine tooth specimens (enamel and dentin; sizes 3.2 x 3.2 x 2.0 mm) were restored with resin-composite on polystyrene bars; 18 samples were bonded, and 30 were not bonded. Specimens were suspended in a lactic acid solution (pH = 5; 14 days) in a modified brushing machine, and artificial caries lesions were formed. During caries development, specimens were mechanically loaded at the surface of the polystyrene bar, bent so that the tooth- composite interfaces were subjected to opening forces (16x/min). Loads applied were either none (Control Bonded, CB, n = 6; and Control Non-bonded, CNB, n = 6), 200 gr (NB200, n = 12), or 350 gr (NB350 and B350, both n = 12). Before and after caries development, specimens were imaged with transverse wavelength-independent microradiography (T-WIM), and lesion depth (LD) and mineral loss (ML) were calculated at 4 different locations. An independent t test was used to compare the LD and ML at the 4 different locations. A statistically significant effect of the level of loading (comparing groups NB200 and NB350) and of bonding (comparing groups NB350 and B350) could be observed, with a higher load and absence of bonding leading to more advanced lesions.
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Affiliation(s)
- N.K. Kuper
- College of Dental Sciences, Department of Preventive and Restorative Dentistry, Radboud University Nijmegen Medical Centre, P.O. Box 9101, NL 6500 HB Nijmegen, The Netherlands
| | - N.J.M. Opdam
- College of Dental Sciences, Department of Preventive and Restorative Dentistry, Radboud University Nijmegen Medical Centre, P.O. Box 9101, NL 6500 HB Nijmegen, The Netherlands
| | - E.M. Bronkhorst
- College of Dental Sciences, Department of Preventive and Restorative Dentistry, Radboud University Nijmegen Medical Centre, P.O. Box 9101, NL 6500 HB Nijmegen, The Netherlands
| | - J.L. Ruben
- College of Dental Sciences, Department of Preventive and Restorative Dentistry, Radboud University Nijmegen Medical Centre, P.O. Box 9101, NL 6500 HB Nijmegen, The Netherlands
| | - M.C.D.N.J.M. Huysmans
- College of Dental Sciences, Department of Preventive and Restorative Dentistry, Radboud University Nijmegen Medical Centre, P.O. Box 9101, NL 6500 HB Nijmegen, The Netherlands
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189
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Naidu E, Stawarczyk B, Tawakoli PN, Attin R, Attin T, Wiegand A. Shear bond strength of orthodontic resins after caries infiltrant preconditioning. Angle Orthod 2013; 83:306-312. [PMID: 22908947 PMCID: PMC8793655 DOI: 10.2319/052112-409.1] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/01/2012] [Accepted: 07/01/2012] [Indexed: 09/01/2023] Open
Abstract
OBJECTIVE To investigate the influence of caries infiltrant preconditioning on the shear bond strength of orthodontic resin cements on sound and demineralized enamel. MATERIALS AND METHODS Stainless-steel brackets were bonded to sound or artificially demineralized (14 d, acidic buffer, pH 5.0) bovine enamel specimens using a resin cement or a combination of caries infiltrant preconditioning (Icon, DMG) and the respective resin cement (light-curing composite: Heliosit Orthodontic, Transbond XT, using either Transbond XT Primer or Transbond Plus Self Etching Primer; light-curing resin-modified glass ionomer cement: Fuji Ortho; or self-curing composite: Concise Orthodontic Bonding System). Each group consisted of 15 specimens. Shear bond strength was evaluated after thermo-cycling (10,000×, 5°C to 55°C) at a crosshead speed of 1 mm/min, and data were statistically analyzed by analysis of variance, Mann-Whitney test, and Weibull statistics. Adhesive Remnant Index (ARI) scores and enamel fractures were determined at 25× magnification and were statistically analyzed by regression analyses (P < .05). RESULTS The caries infiltrant system significantly increased the shear bond strength of Transbond XT Primer, Transbond Plus Self Etching Primer, and Fuji Ortho in sound specimens, and of all resin cements except for the Concise Orthodontic Bonding System in demineralized enamel. Overall, caries infiltrant preconditioning decreased significantly the number of enamel fractures, but it did not affect ARI scores. CONCLUSION Preconditioning of sound and demineralized enamel with the caries infiltrant system did not impair but rather increased the shear bond strength of most orthodontic resin cements while decreasing the risk of enamel fracture at debonding.
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Affiliation(s)
- Ewelina Naidu
- Assistant, Department of Preventive Dentistry, Periodontology and Cariology, University of Zurich, Switzerland
| | - Bogna Stawarczyk
- Dental Technician, Department of Fixed and Removable Prosthodontics and Dental Material Science, University of Zurich, Switzerland, and Department of Prosthodontics, Ludwig-Maximillians University, Munich, Germany
| | - Pune Nina Tawakoli
- Assistant, Department of Preventive Dentistry, Periodontology and Cariology, University of Zurich, Switzerland
| | | | - Thomas Attin
- Professor and Department Chair, Department of Preventive Dentistry, Periodontology and Cariology, University of Zurich, Switzerland
| | - Annette Wiegand
- Senior Lecturer, Department of Preventive Dentistry, Periodontology and Cariology, University of Zurich, Switzerland
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190
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Aykut-Yetkiner A, Wiegand A, Bollhalder A, Becker K, Attin T. Effect of Acidic Solution Viscosity on Enamel Erosion. J Dent Res 2013; 92:289-94. [DOI: 10.1177/0022034512473115] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023] Open
Abstract
The objective of this in vitro study was to investigate the effects of viscosity changes of different acidic solutions on dental erosion. Bovine enamel samples (n = 240, Ø = 3 mm) were embedded in acrylic resin and were allocated to 30 groups (n = 8). Citric acid (CA) and phosphoric acid (PA) solutions at pH 2.5, 3, and 3.5 were prepared in de-ionized water (titratable acidity to pH 5.5: 31 ± 0.6 mmol OH-/l). The kinetic viscosities of the acidic solutions were adjusted to 1.5, 3, 6, 12, and 24 mm2/sec by the addition of hydroxypropyl cellulose (HPC) at different concentrations. Solutions were pumped over the enamel surface from a reservoir with a drop rate of 1 mL/min. Each specimen was eroded for 10 min at 20°C. Erosion of enamel surfaces was measured by profilometry. Data were analyzed by analyses of variance and logarithmic regression analyses ( p < 0.05). Enamel loss was dependent on viscosity, pH, and the kind of acid. The regression analyses showed that higher viscosity caused lower enamel erosion for both acids and all pH levels. Dental erosion is dependent not only on chemical factors of the acid, like pH and acid type, but also on acid viscosity.
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Affiliation(s)
- A. Aykut-Yetkiner
- University of Zürich, Clinic for Preventive Dentistry, Periodontology and Cariology, Zürich, Switzerland
- University of Ege, Faculty of Dentistry, Department of Pedodontics, Izmir, Turkey
| | - A. Wiegand
- University of Zürich, Clinic for Preventive Dentistry, Periodontology and Cariology, Zürich, Switzerland
| | - A. Bollhalder
- University of Zürich, Clinic for Preventive Dentistry, Periodontology and Cariology, Zürich, Switzerland
| | - K. Becker
- University of Zürich, Clinic for Preventive Dentistry, Periodontology and Cariology, Zürich, Switzerland
| | - T. Attin
- University of Zürich, Clinic for Preventive Dentistry, Periodontology and Cariology, Zürich, Switzerland
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191
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Heintze SD. Clinical relevance of tests on bond strength, microleakage and marginal adaptation. Dent Mater 2013; 29:59-84. [DOI: 10.1016/j.dental.2012.07.158] [Citation(s) in RCA: 129] [Impact Index Per Article: 11.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/02/2012] [Revised: 07/18/2012] [Accepted: 07/26/2012] [Indexed: 11/24/2022]
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192
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Yassen GH, Platt JA. The effect of nonsetting calcium hydroxide on root fracture and mechanical properties of radicular dentine: a systematic review. Int Endod J 2012; 46:112-8. [DOI: 10.1111/j.1365-2591.2012.02121.x] [Citation(s) in RCA: 49] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/05/2012] [Accepted: 08/01/2012] [Indexed: 12/29/2022]
Affiliation(s)
- G. H. Yassen
- Division of Dental Biomaterials, Department of Restorative Dentistry; Indiana University School of Dentistry; Indianapolis IN USA
| | - J. A. Platt
- Division of Dental Biomaterials, Department of Restorative Dentistry; Indiana University School of Dentistry; Indianapolis IN USA
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193
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Son JH, An JH, Kim BK, Hwang IN, Park YJ, Song HJ. Effect of laser irradiation on crystalline structure of enamel surface during whitening treatment with hydrogen peroxide. J Dent 2012; 40:941-8. [PMID: 22858525 DOI: 10.1016/j.jdent.2012.07.015] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/29/2012] [Revised: 07/24/2012] [Accepted: 07/24/2012] [Indexed: 11/17/2022] Open
Abstract
OBJECTIVE This study is to evaluate the effect of laser activation on the whitening and crystalline structure of enamel surface during whitening treatment with hydrogen peroxide. METHODS Bovine teeth were treated with whitening gel containing 35% hydrogen peroxide. A whitening gel was applied on the enamel surface for a period of 5 min, and then irradiated using a diode laser (740 nm) during whitening treatment for 0, 30, 60, 120 and 180s for the GL0-W, GL30-W, GL60-W, GL120-W and GL180-W groups, respectively. The total whitening application time was 30 min for all groups. RESULTS Laser-irradiated enamel groups showed a similar lightness compared to the GL0-W group. The thickness of porous layer observed on the enamel surface of GL0-W group was decreased by increasing the laser irradiation time. While the Ca and P contents of the GL0-W group were lower than those of the non-whitening treated group (GL0-C), the Ca and P contents of the GL180-W group were similar to those of the GL180-C group. The enamel crystallinity was dramatically decreased by whitening treatment without laser irradiation. However, the decrease of crystallinity was protected by laser irradiation during whitening treatment. Raman measurement verified that laser irradiation could prevent the loss of mineral compositions on enamel and maintain its crystalline structure. SIGNIFICANCE The professional whitening treatment with hydrogen peroxide and diode laser activation improves not only the whitening effect but also protects the change of enamel structure compared to the treatment with only gel.
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Affiliation(s)
- Jung-Hyun Son
- Department of Dental Materials and Medical Research Center for Biomineralization Disorders, School of Dentistry, Chonnam National University, Gwangju 500-757, South Korea
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194
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Wang C, Li Y, Wang X, Zhang L, Tiantang, Fu B. The Enamel Microstructures of Bovine Mandibular Incisors. Anat Rec (Hoboken) 2012; 295:1698-706. [DOI: 10.1002/ar.22543] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/16/2012] [Accepted: 06/26/2012] [Indexed: 11/07/2022]
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195
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MURAYAMA R, FURUICHI T, YOKOKAWA M, TAKAHASHI F, KAWAMOTO R, TAKAMIZAWA T, KUROKAWA H, MIYAZAKI M. Ultrasonic investigation of the effect of S-PRG filler-containing coating material on bovine tooth demineralization. Dent Mater J 2012. [DOI: 10.4012/dmj.2012-153] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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