1
|
Souza CDMS, Sakae LO, Carneiro PMA, Esteves RA, Scaramucci T. Interplay between different manual toothbrushes and brushing loads on erosive tooth wear. J Dent 2020; 105:103577. [PMID: 33388388 DOI: 10.1016/j.jdent.2020.103577] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/29/2020] [Revised: 12/23/2020] [Accepted: 12/26/2020] [Indexed: 11/24/2022] Open
Abstract
OBJECTIVE To investigate the effect of different types of manual toothbrushes and brushing loads on the progression of erosive tooth wear (ETW) on enamel. METHODS Bovine enamel specimens (n = 10) were submitted to a 5-day erosive-abrasive cycling model (0.3 % citric acid for 5 min, artificial saliva for 60 min, 4x/day). Toothbrushing was carried out 2x/day for 15 s, according to the toothbrushes tested (ultra-soft (a): Curaprox 5460; ultra-soft (b): Sensodyne Repair & Protect; soft (a): Colgate Slim Soft; soft (b): Oral-B Indicator Plus; medium: Johnson's Professional; hard: Tek) and brushing loads (1.5 N, 3 N). Surface loss (SL, in μm) was assessed by optical profilometry on conclusion of the cycling. Some of the toothbrush characteristics were evaluated. Data were statistically analyzed (α = 0.05). RESULTS For the 1.5 N load, the hard brush showed the highest SL value, with statistical significance. The other toothbrushes did not differ significantly, except that ultra-soft (a) caused significantly higher SL than ultra-soft (b). For the 3 N load, hard and soft (a) exhibited the highest SL. Soft (b) and medium had the lowest SL value, with statistical significance. Only soft (a) and ultra-soft (b) showed significant difference between loads, with lower SL for the load of 1.5 N. None of the toothbrush characteristics were significantly correlated with SL. CONCLUSIONS Although different degrees of enamel surface loss were observed with use of the different toothbrushes, no association was found between the toothbrush characteristics and SL. Depending on the toothbrush, the force of brushing was capable of modulating the ETW of enamel. Based on the brushing loads usually applied by healthy individuals, hard brushes are not recommended for use by patients with ETW. CLINICAL SIGNIFICANCE The use of hard bristle brushes is not recommended for use by individuals who exert healthy forces when brushing their teeth. The toothbrush characteristics are of secondary importance in terms of causing enamel loss in ETW.
Collapse
Affiliation(s)
- Cíntia de Melo Silva Souza
- Department of Clinic, University Center of State of Para, School of Dentistry, Tv. 9 de Janeiro 927, Belém, PA, 66060-080, Brazil.
| | - Letícia Oba Sakae
- Department of Restorative Dentistry, University of São Paulo, School of Dentistry, Av. Prof. Lineu Prestes 2227, Cidade Universitária, São Paulo, SP, 05508-000, Brazil.
| | - Paula Mendes Acatauassú Carneiro
- Department of Clinic, University Center of State of Para, School of Dentistry, Tv. 9 de Janeiro 927, Belém, PA, 66060-080, Brazil.
| | - Renata Antunes Esteves
- Department of Clinic, University Center of State of Para, School of Dentistry, Tv. 9 de Janeiro 927, Belém, PA, 66060-080, Brazil.
| | - Taís Scaramucci
- Department of Restorative Dentistry, University of São Paulo, School of Dentistry, Av. Prof. Lineu Prestes 2227, Cidade Universitária, São Paulo, SP, 05508-000, Brazil.
| |
Collapse
|
2
|
Borges MHR, Dias CGT, Alencar CDM, Silva CM, Esteves RA. Evaluation of physical-mechanical properties of self-adhesive versus conventional resin cements. Braz J Oral Sci 2020. [DOI: 10.20396/bjos.v19i0.8658204] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022] Open
Abstract
Aim: The purpose of this study was to compare the microhardness, diametral tensile strength, compressive strength and the rheological properties of self-adhesive versus conventional resin cements. Methods: Specimens of a conventional (RelyX ARC) and 3 self-adhesive (RelyX U200, Maxcem Elite, Bifix SE) types of resin cements were prepared. The Knoop test was used to assess the microhardness, using a Microhardness Tester FM 700. For the diametral tensile strength test, a tensile strength was applied at a speed of 0.6 mm/minute. A universal testing machine was used for the analysis of compressive strength and a thermo-controlled oscillating rheometer was used for the Rheology test. One-way ANOVA and Tukey’s test (α=0.05) were used for data analysis. Results: According to microhardness analysis, all the cements were statistically similar (p>0.05), except for Maxcem that presented lower hardness compared with the other cements in relation to the top surface (p<0.05). In the diametral tensile strength test, Relyx U200 and RelyX ARC cements were statistically similar (p>0.05), presented higher value when compared to the Maxcem and Bifix cements (p<0.05). The compressive strength of RelyX ARC and Maxcem Elite cements was statistically higher than RelyX U200 and Bifix cements (p<0.05). Regarding the rheology test, Maxcem Elite and RelyX ARC cements showed a high modulus of elasticity. Conclusions: The self-adhesive cements presented poorer mechanical properties than conventional resin cement. Chemical structure and types of monomers employed interfere directly in the mechanical properties of resin cements.
Collapse
|
3
|
Alencar CDM, Pedrinha VF, Araújo JLN, Esteves RA, Silva da Silveira AD, Silva CM. Effect of 10% Strontium Chloride and 5% Potassium Nitrate with Fluoride on Bleached Bovine Enamel. Open Dent J 2017; 11:476-484. [PMID: 28979576 PMCID: PMC5611777 DOI: 10.2174/1874210601711010476] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/25/2017] [Revised: 05/19/2017] [Accepted: 07/17/2017] [Indexed: 11/22/2022] Open
Abstract
Background: Dental whitening has been increasingly sought out to improve dental aesthetics, but may cause chemical and morphological changes in dental enamel surfaces. Objective: This study evaluated in vitro the effect of 10% strontium chloride and 5% potassium nitrate with fluoride on bovine enamel, through tristimulus colorimetry, Knoop microhardness (KHN), and roughness after bleaching with 35% hydrogen peroxide (HP). Methods: The specimens were divided into three groups (n=15): GControl received bleaching treatment with 35% HP; GNitrate received bleaching with 35% HP followed by the application of 5% potassium nitrate with 2% sodium fluoride; and GStrontium received bleaching with 35% HP followed by the application of 10% strontium chloride on the enamel. Next, five specimens of each experimental group were subjected to KHN and tristimulus colorimetry tests, and 10 specimens were subjected to surface roughness (SR) tests. The values obtained for the different groups were compared through analysis of variance (ANOVA) followed by a post-hoc Tukey-Kramer test in addition to Student’s T-test for paired data. Results: In the intergroup comparison, KHN final differed statistically (p<0.05). The mean SR final of the experimental groups differed statistically from the GControl group (p<0.05). In addition, the groups did not differ in color variation (p>0.05). Conclusion: 10% strontium chloride and 5% potassium nitrate combined with 2% fluoride downplayed morphological changes to the enamel, without interfering with the effectiveness of the bleaching process.
Collapse
|
4
|
Gauch LMR, Pedrosa SS, Silveira-Gomes F, Esteves RA, Marques-da-Silva SH. Isolation of Candida spp. from denture-related stomatitis in Pará, Brazil. Braz J Microbiol 2017; 49:148-151. [PMID: 29054393 PMCID: PMC5790581 DOI: 10.1016/j.bjm.2017.07.001] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/27/2013] [Accepted: 05/02/2016] [Indexed: 11/05/2022] Open
Abstract
The aim of this study was to isolate and identify Candida species from the oral cavity of denture wearers with denture-related stomatitis who were attended at the University Federal of Pará (Belém City, Pará State, Brazil). A total of 36 denture wearers with denture-related stomatitis were included, and type I (50%), type II (33%) and type III (17%) stomatitis were observed. Candida spp. were isolated from 89% of the cases and included five different Candida species. C. albicans was the most frequently recovered species (78% of the cases), followed by C. famata and C. tropicalis. We observed a significant association between Candida species isolation and unsatisfactory denture condition (p = 0.0017). Our results demonstrated the highly frequency of Candida species isolation in denture wearers with denture-related stomatitis and showed the relationship between these species and poor denture maintenance.
Collapse
Affiliation(s)
- Lurdete Maria Rocha Gauch
- Federal University of Pará, Science Health Institute Belém, Odontology College, Belém, PA, Brazil; Federal University of Pará, Science Biologic Institute, Postgraduate Program in Biology of Infectious and Parasitic Agents, Belém, PA, Brazil.
| | - Simone Soares Pedrosa
- Federal University of Pará, Science Health Institute Belém, Odontology College, Belém, PA, Brazil
| | - Fabíola Silveira-Gomes
- Federal University of Pará, Science Biologic Institute, Postgraduate Program in Biology of Infectious and Parasitic Agents, Belém, PA, Brazil
| | - Renata Antunes Esteves
- Federal University of Pará, Science Health Institute Belém, Odontology College, Belém, PA, Brazil
| | | |
Collapse
|
5
|
Petta TDM, do Socorro Batista de Lima Gomes Y, Antunes Esteves R, do Carmo Freitas Faial K, Souza D`Almeida Couto R, Martins Silva C. Chemical Composition and Microhardness of Human Enamel Treated with Fluoridated Whintening Agents. A Study in Situ. Open Dent J 2017; 11:34-40. [PMID: 28405245 PMCID: PMC5368773 DOI: 10.2174/1874210601711010034] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2016] [Revised: 11/25/2016] [Accepted: 12/12/2016] [Indexed: 11/22/2022] Open
Abstract
Background:
Dental whitening has been increasingly sought out to improve dental aesthetics, but may cause chemical and morphological changes in dental enamel surfaces.
Objective:
Assess in situ the effects of high-concentration hydrogen peroxide with and without fluoride on human dental enamel using the ion chromatography test (IC) and the Knoop hardness test (KHN).
Material and Methods:
Nineteen enamel specimens were prepared using third human molars. These specimens were fixed on molars of volunteers and were divided into groups: OP38-Opalescence Boost PF38%, PO37-Pola Office 37.5% and CO-Control group. For chemical analysis (n= 3), the dentin layer was removed, keeping only the enamel, which was subjected to acidic digestion by microwave radiation. It was necessary to perform sample dilutions for the elements fluorine (F), calcium (Ca) and phosphorus (P) for quantification using the IC test. The KHN (n= 5) was performed before and after the treatments. Five indentations were made, separated by 100 µm, for each specimen using a load of 25 gf for 5 seconds in the microdurometer. The data were analyzed using ANOVA with a 5% significance level.
Results:
The OP38 group had the largest concentrations of F, Ca and P ions. The PO37 group showed the lowest concentrations of F and Ca ions. The average KHN was not significantly different between the OP38 and PO37 groups.
Conclusion:
Enamel whitened with hydrogen peroxide containing fluoride had greater concentrations of F, Ca and P ions. The presence of fluoride in the whitening agent did not influence the enamel microhardness.
Collapse
|
6
|
Gauch LMR, Silveira-Gomes F, Esteves RA, Pedrosa SS, Gurgel ESC, Arruda AC, Marques-da-Silva SH. Effects of Rosmarinus officinalis essential oil on germ tube formation by Candida albicans isolated from denture wearers. Rev Soc Bras Med Trop 2014; 47:389-91. [DOI: 10.1590/0037-8682-0137-2013] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/08/2013] [Accepted: 11/18/2013] [Indexed: 12/26/2022] Open
|
7
|
Fuchs E, Esteves RA, Coulombe PA. Transgenic mice expressing a mutant keratin 10 gene reveal the likely genetic basis for epidermolytic hyperkeratosis. Proc Natl Acad Sci U S A 1992; 89:6906-10. [PMID: 1379726 PMCID: PMC49613 DOI: 10.1073/pnas.89.15.6906] [Citation(s) in RCA: 138] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022] Open
Abstract
Epidermolytic hyperkeratosis (EH; previously called bullous congenital ichthyosiform erythroderma) is an autosomal dominant skin disease of unknown etiology, affecting approximately 1 out of 300,000 people. It is typified by hyperkeratotic scaliness, blistering due to cytolysis within suprabasal epidermal cells, and hyperproliferation in basal cells. Histologically, EH epidermis exhibits a thickened stratum corneum and granular layer, with enlarged and irregular-shaped cells. Ultrastructurally, only suprabasal layers are affected, with three major aberrancies: (i) tonofilament clumping, (ii) nuclei and keratohyalin granules of irregular shape and size, and (iii) cell degeneration. We have discovered that transgenic mice expressing a mutant keratin 10 gene have the EH phenotype, thereby suggesting that a genetic basis for human EH residues in mutations in genes encoding suprabasal keratins K1 and K10. In addition, we show that (i) stimulation of basal cell proliferation can arise from a defect in suprabasal cells, and (ii) distortion of nuclear shape or aberrations in cytokinesis can occur when an intermediate filament network is perturbed.
Collapse
Affiliation(s)
- E Fuchs
- Howard Hughes Medical Institute, Department of Molecular Genetics and Cell Biology, University of Chicago, IL 60637
| | | | | |
Collapse
|
8
|
Librach CL, Werb Z, Fitzgerald ML, Chiu K, Corwin NM, Esteves RA, Grobelny D, Galardy R, Damsky CH, Fisher SJ. 92-kD type IV collagenase mediates invasion of human cytotrophoblasts. J Cell Biol 1991; 113:437-49. [PMID: 1849141 PMCID: PMC2288933 DOI: 10.1083/jcb.113.2.437] [Citation(s) in RCA: 522] [Impact Index Per Article: 15.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022] Open
Abstract
The specialized interaction between embryonic and maternal tissues is unique to mammalian development. This interaction begins with invasion of the uterus by the first differentiated embryonic cells, the trophoblasts, and culminates in formation of the placenta. The transient tumor-like behavior of cytotrophoblasts, which peaks early in pregnancy, is developmentally regulated. Likewise, in culture only early-gestation human cytotrophoblasts invade a basement membrane-like substrate. These invasive cells synthesize both metalloproteinases and urokinase-type plasminogen activator. Metalloproteinase inhibitors and a function-perturbing antibody specific for the 92-kD type IV collagen-degrading metalloproteinase completely inhibited cytotrophoblast invasion, whereas inhibitors of the plasminogen activator system had only a partial (20-40%) inhibitory effect. We conclude that the 92-kD type IV collagenase is critical for cytotrophoblast invasion.
Collapse
Affiliation(s)
- C L Librach
- Department of Stomatology, University of California, San Francisco 94143
| | | | | | | | | | | | | | | | | | | |
Collapse
|
9
|
Abstract
The inner ear forms from paired ectodermal primordia that lie to either side of the developing hindbrain. Initially each primordium forms a shallow depression in the ectodermal surface. Invagination to form an otic pit coincides with the formation of several deep folds in the epithelial surface. An initial fold appears parallel to the embryonic axis and at the junction of the rhombencephalon with somitomeric mesoderm. This is followed by formation of cranial and caudal folds perpendicular to the axis and minor folds that are within the pit formed by earlier folding. The central region of the otic primordium remains in close apposition to the lateral surface of the neural tube during the process of fold formation, until the otic pit becomes quite deep. At that time, mesenchymal cells penetrate between the two layers. Experimental analysis of invagination supports the conclusion that otic invagination is controlled differently from that of similar organ primordia, such as the eye and thyroid. Whereas these other primordia can be stimulated to undergo normal morphogenetic shape changes precociously by treatments that presumably activate motile processes in the cytoskeleton, the same conditions have little effect on the otic placode. Similarly, neither inhibitors of calcium transport nor inactivators of calmodulin activity prevent otic pit formation, while these drugs block invagination of other primordia. These results suggest that otic invagination may be caused by changes in the surrounding tissues rather than by an activation of motility within the primordium.
Collapse
Affiliation(s)
- S R Hilfer
- Department of Biology, Temple University, Philadelphia, Pennsylvania 19122
| | | | | |
Collapse
|