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1.
Shanghai Kou Qiang Yi Xue ; 29(4): 375-379, 2020 Aug.
Artigo em Chinês | MEDLINE | ID: mdl-33089285

RESUMO

PURPOSE: To investigate the effect of commonly used subgingival wedge-shaped defect filling materials on the formation of Porphyromonas gingivalis (P.gingivalis) biofilm. METHODS: Subgingival class V cavities were prepared on the buccal surfaces of 48 extracted premolars. After that, the premolars were randomly divided into 3 groups (A, B and C) with 16 in each group. After filling and polishing with universal nano fluid resin, universal nano solid resin and glass ionomer cement individually, Isomet 4000 precision cutting machine was used to make specimens containing all the filling materials (mesiodistal distance: 5 mm, occlusal-gingival distance: 3 mm, buccolingual distance: 2 mm). All the specimens were placed in P.gingivalis bacterial solution for 24 hours to form P.gingivalis biofilm. Then the attachment amount of P.gingivalis was observed by crystal violet staining. Confocal laser scanning microscopy (CLSM) was used to observe the P.gingivalis biofilm. SPSS 22.0 software package was used for Kruskal-Wallis rank sum test. RESULTS: The results of crystal violet staining showed that the amount of P.gingivalis adhered to the glass ionomer cement filling surface was significantly less than that of other groups(P<0.05). CLSM scan showed no significant difference in proportion of viable bacteria and biofilm thickness among three groups (P>0.05). P.gingivalis biofilm in glass ionomer cement group was sparse, showing small clumps, and did not aggregate into pieces. On the surface of universal nano solid resin, P.gingivalis biofilm was in large pieces with a three-dimensional structure. CONCLUSIONS: Compared with the universal nano solid/fluid resin, the surface of glass ionomer cement is not conducive to the formation of P.gingivalis biofilm. Therefore, from the perspective of periodontal health, glass ionomer cement is suitable for filling treatment of subgingival wedge-shaped defects.


Assuntos
Materiais Dentários , Porphyromonas gingivalis , Biofilmes , Cimentos de Ionômeros de Vidro , Microscopia Confocal
2.
J Contemp Dent Pract ; 21(6): 691-695, 2020 Jun 01.
Artigo em Inglês | MEDLINE | ID: mdl-33025941

RESUMO

AIM: The longevity of restorative materials depends on the resistance to masticatory forces. The present study was undertaken to evaluate the mechanical and microleakage properties of Cention-N with glass ionomer cement (GIC) and composite restorative materials. MATERIALS AND METHODS: A total of 45 specimen blocks were prepared with 15 samples of each type of restorative material, namely Cention-N, GIC, and hybrid composite. Samples were subjected to load at crosshead speed of 0.75 ± 0.25 mm/min till the fracture of sample. Class V cavities were prepared on the buccal surface of orthodontically extracted premolars followed by restoration of each test material. All the surfaces of the tooth were coated with clear nail varnish except 1 mm around the margins of the restorations. These samples were immersed in 0.5% basic fuchsine dye and longitudinally sectioned and observed under stereomicroscope to check microleakage. The obtained data were statistically evaluated. RESULTS: We found the highest mean compressive and flexural strength for hybrid composite followed by Cention-N and least for GIC which is statistically significant (p < 0.001). CONCLUSION: Mean microleakage was least for Cention-N. Cention-N is a newer restorative material having higher mechanical properties with lesser microleakage. CLINICAL SIGNIFICANCE: Cention-N is a newer restorative material having promising properties. This material can be used as an alternative restorative material.


Assuntos
Infiltração Dentária , Resinas Compostas , Materiais Dentários , Restauração Dentária Permanente , Cimentos de Ionômeros de Vidro , Humanos
3.
Am J Dent ; 33(5): 273-276, 2020 Oct.
Artigo em Inglês | MEDLINE | ID: mdl-33017531

RESUMO

PURPOSE: To evaluate the effect of glass-ionomer cement (GIC) on gene expression (gtfC, gtfD, covR, and vicR) of Streptococcus mutans (S. mutans) biofilms at 2, 4 and 24 hours. METHODS: Six groups were tested according to the materials and time observation, as follows: ceramic (IPS Empress Esthetic), as the control group, and GIC (Ketac Molar Easymix); and time points of S. mutans biofilm formation (2, 4, and 24 hours). Round-shaped samples (10 x 2 mm) of each material were prepared according to the manufacturers' specifications. GIC discs were handled in a laminar flow hood under aseptic conditions and stored at 100% relative humidity at 37°C for 24 hours to complete setting reaction. The samples were placed in a 24-well plate and immersed in 1.5 ml BHI + 1% sucrose with an inoculum of S. mutans UA159 to allow biofilm growth during 2, 4, and 24 hours. Next, the samples were removed, vortexed and centrifuged to collect cell pellets (n=5) for each material and time point. Pellets were stored at -80°C. Then, RNA was purified using the RNeasy Mini Kit protocol. The RNA was converted in cDNA using iScript cDNA Synthesis according to the manufacturer's recommendations. Analysis of gtfC, gtfD, vicR, and covR expressions was performed using Step One Real-Time qPCR device with specific primers for each gene and the analysis normalized by 16S reference gene expression. Data from gtfC, gtfD, and vicR were analyzed by t-test to compare between groups while Mann-Whitney was used to analyze covR expression (α= 0.05). RESULTS: No significant differences at 2 and 4 hours between materials for all analyzed genes were noted. However, in the 24-hour period, a significant decrease in gtfC and vicR expressions were observed, while covR expression increased when GIC was compared to ceramic. CLINICAL SIGNIFICANCE: The use of glass-ionomer cement decreased the virulence of S. mutans biofilms, which may imply a reduced bacterial cariogenic potential.


Assuntos
Cimentos de Ionômeros de Vidro/farmacologia , Streptococcus mutans/genética , Biofilmes , Sacarose , Virulência
4.
J Contemp Dent Pract ; 21(7): 741-747, 2020 Jul 01.
Artigo em Inglês | MEDLINE | ID: mdl-33020356

RESUMO

AIM: This study was aimed to compare the microleakage of amalgam restorations repaired with bonded amalgam, composite resin, ormocer, and glass ionomer restorative material. MATERIALS AND METHODS: Sixty extracted maxillary human premolars were prepared and restored with class I amalgam. A simulated defect was prepared that included the cavosurface margin on restorations, and the premolars were assigned to four treatment groups (n = 15): In group I, premolars were treated by bonded amalgam; in group II, premolars were repaired with composite resin; in group III, premolars were repaired by ormocer; and in group IV, premolars were repaired with glass ionomer restorative material. The teeth were immersed in 50% silver nitrate solution, thermocycled, sectioned longitudinally, and then blindly observed under a stereomicroscope by three trained examiners. Microleakage was evaluated using a 0-4 scale for dye penetration, and data were analyzed by Kruskal-Wallis test and Mann-Whitney U-test. RESULTS: The microleakage values were more in the group repaired with glass ionomer restorative material and the Chi-squared test showed no significant difference in between the groups repaired with bonded amalgam, composite resin, and ormocer, but showed significant difference between the groups repaired with ormocer and glass ionomer restorative materials and between composite resin and glass ionomer restorative materials. CONCLUSION: None of the restorative techniques evaluated were able to completely eliminate marginal microleakage. CLINICAL SIGNIFICANCE: The results seem to be favorable within the limits of the in vitro conditions of the present study; however, the in vivo conditions are the best for clinically relevant findings.


Assuntos
Infiltração Dentária , Restauração Dentária Permanente , Resinas Compostas , Cimentos de Ionômeros de Vidro , Humanos , Cerâmicas Modificadas Organicamente
5.
J Oral Sci ; 62(4): 444-448, 2020 Sep 26.
Artigo em Inglês | MEDLINE | ID: mdl-32879159

RESUMO

PURPOSE: High-viscosity glass ionomer cements (HV-GICs) are reinforced with ultrafine, highly reactive glass particles, as well as a higher-molecular-weight polyalkenoic acid component. Silver diammine fluoride (SDF) is an agent with promising activity against active caries. The present study aimed to evaluate the shear bond strength (SBS) and interfacial morphology of a new HV-GIC bonded to dentin after treatment with various adhesive protocols including SDF. METHODS: HV-GIC cylinders were bonded to dentin after various surface treatments (6 groups, n = 22): water; polyalkenoic acid; SDF; SDF + potassium iodide (KI); SDF + KI + polyalkenoic acid; SDF + KI + two weeks of storage in water + polyalkenoic acid. For each group, 20 samples were tested for SBS after 48 h, and 2 samples were cut and subjected to environmental scanning electron microscopy (E-SEM) and energy-dispersive X-ray (EDX) analysis. RESULTS: No significant differences in SBS were found between any of the protocols tested. However, E-SEM and EDX images showed different interfaces when SDF was applied. CONCLUSION: SDF has no influence on the adhesion of HV-GIC to sound dentin and could potentially improve the cario-resistance of the dentin/HV-GIC interface.


Assuntos
Colagem Dentária , Cimentos de Ionômeros de Vidro , Amônia , Dentina , Fluoretos , Teste de Materiais , Resistência ao Cisalhamento , Compostos de Prata , Viscosidade
6.
Braz Dent J ; 31(4): 440-444, 2020 Sep 04.
Artigo em Inglês | MEDLINE | ID: mdl-32901722

RESUMO

Posterior build-ups are auxiliary devices to orthodontic treatment which are made with resin-based or glass ionomer composites. Their removal requires care to protect the tooth surface, therefore, pigmented materials are preferred for a better visualization. This study proposed a pigmentation experimental technique of a regular composite resin, evaluating the microshear bond strength test (µ-SBT) of this experimental pigmented resin and comparing with a blue-colored polyacid-modified composite resin, used for posterior buildups. Forty-eight buccal and lingual surfaces of human teeth were used and randomly divided into 4 groups (n=12). The groups were divided into: C (control), regular composite resin; P, regular composite resin pigmented; UBL, Ultra Band Lok™; OB, Ortho Bite™. The composites were bonded using a matrix to obtain microcylinders and prepared for each experimental groups. The samples were then stored in distilled water for 24h at 37°C followed by a µ-SBT. The types of bond failures were evaluated using a stereoscopic magnifying glass (10×). The data were analyzed by ANOVA with Fisher post hoc and Dunnett´s test. Means of µ-SBT± standard deviation (MPa) were: C (39.98a±13.0), P (40.09a± 14.3); UBL (33.26ab±8.6); OB (28.70b±5.5). The most prevalent type of failure was adhesive (80.4%). Further, was not observed a statistically significant correlation between the bond strength values and failure patterns. The pigmentation of a commercially available resin did not alter the µ-SBT and exhibited similar adhesiveness as a polyacid-modified composite resin.


Assuntos
Resinas Compostas , Colagem Dentária , Cimentos de Ionômeros de Vidro , Humanos , Teste de Materiais , Pigmentação , Cimentos de Resina
7.
Braz Dent J ; 31(4): 445-452, 2020 Sep 04.
Artigo em Inglês | MEDLINE | ID: mdl-32901723

RESUMO

The aim of this study was to assess the effect of different commercial liquid phases (Ketac, Riva, and Fuji IX) and the use of spherical pre-reacted glass (SPG) fillers on cement maturation, fluoride release, compressive (CS) and biaxial flexural strength (BFS) of experimental glass ionomer cements (GICs). The experimental GICs (Ketac_M, Riva_M, FujiIX_M) were prepared by mixing SPG fillers with commercial liquid phases using the powder to liquid mass ratio of 2.5:1. FTIR-ATR was used to assess the maturation of GICs. Diffusion coefficient of fluoride (DF) and cumulative fluoride release (CF) in deionized water was determined using the fluoride ion specific electrode (n=3). CS and BFS at 24 h were also tested (n=6). Commercial GICs were used as comparisons. Riva and Riva_M exhibited rapid polyacrylate salt formation. The highest DF and CF were observed with Riva_M (1.65x10-9 cm2/s) and Riva (77 ppm) respectively. Using SPG fillers enhanced DF of GICs on average from ~2.5x10-9 cm2/s to ~3.0x10-9 cm2/s but reduced CF of the materials on average from ~51 ppm to ~42 ppm. The CS and BFS of Ketac_M (144 and 22 MPa) and Fuji IX_M (123 and 30 MPa) were comparable to commercial materials. Using SPG with Riva significantly reduced CS and BFS from 123 MPa to 55 MPa and 42 MPa to 28 MPa respectively. The use of SPG fillers enhanced DF but reduced CF of GICs. Using SPG with Ketac or Fuji IX liquids provided comparable strength to the commercial materials.


Assuntos
Cimentos Dentários , Cimentos de Ionômeros de Vidro , Força Compressiva , Teste de Materiais , Resistência à Tração
8.
Int J Nanomedicine ; 15: 4755-4762, 2020.
Artigo em Inglês | MEDLINE | ID: mdl-32753864

RESUMO

Aim: This study was conducted to evaluate the effects of three nanoparticle solutions used as dentin pretreatments on the microshear bond strength (µSBS) of a conventional glass ionomer cement (GIC) to dentin. Materials and Methods: Ninety intact human molars were used after sectioning their occlusal surfaces to expose flat dentin surfaces. The specimens were randomly assigned to nine groups (n = 10). Group A was the control group (without using the cavity disinfectant). In groups B, C, D, and E, the prepared dentin surfaces were treated with 1 cc 2% chlorhexidine (CHX), 0.1% silver nanoparticle (SNP), 0.1% titanium dioxide nanoparticle (TNP), and 0.1% zinc oxide nanoparticle (ZNP) solutions for 1 minute, respectively, before applying the conditioner. CHX, SNPs, TNPs, and ZNPs were applied for 1 minute after applying the conditioner in groups F, G, H, and I, respectively. The specimens were restored with a conventional GIC and underwent µSBS testing after 24 hours. The data were analyzed using the one-way analysis of variance and Tukey's test (p=0.05). Results: The applications of the nanoparticles (SNP, TNP, and ZNP) after the conditioner were associated with significantly greater µSBS values compared to that of the control group (p values < 0.05). Significantly higher µSBS values were observed when TNP or ZNP was applied after the conditioner compared to their applications before the conditioner (p values < 0.05). The highest µSBS values were observed when TNP was applied after the conditioner. Conclusion: Dentin pretreatment with the nanoparticles after applying the conditioner enhanced the bond strength of the GIC to dentin compared with the control group. The best results were obtained for the TNPs applied after the conditioner.


Assuntos
Colagem Dentária , Dentina/efeitos dos fármacos , Cimentos de Ionômeros de Vidro/farmacologia , Nanopartículas Metálicas/química , Prata/farmacologia , Titânio/farmacologia , Óxido de Zinco/farmacologia , Clorexidina/farmacologia , Cimentos de Ionômeros de Vidro/química , Humanos , Teste de Materiais , Propriedades de Superfície
9.
J Am Dent Assoc ; 151(9): 678-683, 2020 Sep.
Artigo em Inglês | MEDLINE | ID: mdl-32854870

RESUMO

BACKGROUND AND OVERVIEW: Molar-incisor hypomineralization (MIH) is a qualitative developmental defect of enamel, which has been a daily concern in clinical practice owing to its difficult treatment. CASE DESCRIPTION: An 11-year-old girl was admitted to the pediatric dental clinic with a symptom of severe hypersensitivity in the permanent molars owing to MIH. The treatment consisted of a simplified occlusal replica adapted technique with conventional glass ionomer cement in the MIH-affected molars, which involved laboratory and clinical stages. The patient was reexamined every 3 months, and after 18 months there was no additional tooth structure loss, restoration failure, or pain. This technique may be considered a feasible alternative to restore hypomineralized teeth owing to its reduced procedure time and good performance in the follow-up period of 18 months. CONCLUSIONS AND PRACTICAL IMPLICATIONS: The technique successfully restored the function and shape of the affected teeth, decreasing the sensitivity by means of covering the demarcated MIH opacities.


Assuntos
Hipoplasia do Esmalte Dentário , Cimentos de Ionômeros de Vidro , Criança , Feminino , Seguimentos , Humanos , Incisivo , Dente Molar
10.
Niger J Clin Pract ; 23(8): 1073-1078, 2020 Aug.
Artigo em Inglês | MEDLINE | ID: mdl-32788484

RESUMO

Aims: The aim of this study was to compare the retention of different luting agents used with implant-supported restorations. Materials and Methods: A total of 90 custom metal frameworks and copings were prepared and divided into six different luting agent groups (n = 15/group): polycarboxylate cement (PC), resin-modified glass-ionomer cement (RMGIC), two self-adhesive resin cements (SARC), copper-ion zinc-phosphate cement (CZPC), and non-eugenol temporary resin cement (TRC). After sandblasting with 50 µm Al2O3, the copings were cemented on frameworks and stored in artificial saliva for 48 h at 37°C and thermocycled between 5-55°C for 37,500 cycles. Samples were subjected to tensile testing by a universal testing machine, and data were statistically analyzed. Results: The differences between the retention values of types of cement were significant (P < 0.05). The maximum retention value was calculated for CZPC (755,12 ± 55 MPa) while the lowest value was for TRC (311,7 ± 61 Mpa). Conclusion: Neither of the tested cement had superiority over another to ensuring retention. The types of cement presented were meant to be a discretionary guide for the clinician in deciding the amount of the desired retention between castings and abutments.


Assuntos
Implantes Dentários , Retenção em Prótese Dentária , Cimentos de Ionômeros de Vidro/química , Cimento de Policarboxilato/química , Cimento de Fosfato de Zinco/química , Cimentação , Cimentos Dentários , Retenção em Prótese Dentária/métodos , Prótese Dentária Fixada por Implante , Análise do Estresse Dentário/instrumentação , Humanos , Teste de Materiais , Cimentos de Resina , Propriedades de Superfície , Óxido de Zinco
11.
Am J Dent ; 33(4): 171-177, 2020 Aug.
Artigo em Inglês | MEDLINE | ID: mdl-32794389

RESUMO

PURPOSE: To evaluate the wear in vitro of a new ion-releasing powder/liquid polymer resin in relation to that of glass-ionomer derivatives and conventional composites. METHODS: Flat specimens (eight per material) of the ion-releasing powder/liquid polymer resin Cention N, five resin-modified glass-ionomer cements [ChemFil Rock, Equia Fil (with and without coating), Fuji II, Photac Fil, Riva], six conventional glass-ionomer cements (Fuji IX, Fuji IX GP, Ionofil Molar, Ketac Fil Plus, Ketac Molar, Ketac Universal), and two popular conventional resin composites (CeramX, Filtek Z350 XT) were processed and luted to aluminum holders. After storage in water at 37°C for 24 hours, the specimens were polished to 2,500 grit and subjected to the Ivoclar wear method, which mainly simulates attrition wear using a commercially available chewing simulator. A standardized stylus made of pressable ceramic (IPS Empress) hits flat specimens 120,000 times with a 5 kg weight and a lateral movement of 0.7 mm under constant exchange of water at different temperatures (5°C/55°C). The vertical loss was measured on plaster replicas with a laser scanner and 3D software. The Ivoclar wear method moderately correlates with clinical wear. RESULTS: The mean vertical wear of the resin-modified glass-ionomer cements was statistically significantly higher, between 616±44 µm (Ionofil Molar) and 946±101 µm (Fuji IX GP) than that of the ion-releasing polymer resin Cention N (327±63 µm) (ANOVA post-hoc Tukey B, P< 0.01), which was in the same statistical group of the conventional resin CeramX (323±31 µm). Filtek Z350 XT showed significantly lower wear (221±19 µm) (ANOVA post-hoc Tukey B, P< 0.05). The materials ChemFil Rock (39±13 µm), Photac Fil (41±9 µm), and Fuji II (42±8 µm) had the lowest antagonist wear, while Ketac Fil Universal (143±37 µm) and CeramX (135±13 µm) had the highest antagonist wear. Antagonist wear for Cention N was somewhere in between (90±21 µm). CLINICAL SIGNIFICANCE: For the restoration of posterior Class II and large Class I restorations, resin-based materials should be chosen over resin-modified or conventional glass-ionomer cements.


Assuntos
Polímeros , Cimentos de Resina , Cimentos de Ionômeros de Vidro , Teste de Materiais
12.
Am J Dent ; 33(4): 196-200, 2020 Aug.
Artigo em Inglês | MEDLINE | ID: mdl-32794394

RESUMO

PURPOSE: To evaluate the effect of silver diamine fluoride (SDF) application on the microshear bond strength (MBS) of glass-ionomer cements (GIC) to caries-affected dentin (Part 1) and dentin cleaning methods to reduce SDF's potential effect on MBS (Part 2). METHODS: For Part 1, 56 extracted human teeth were randomly divided into eight groups with GIC, 38% SDF application and dentin substrate. Samples of artificial caries-affected human dentin were treated or not with 38% SDF and restored with conventional or resin-modified GIC. The same procedures were performed in sound dentin tested for MBS test after 24 hours. In Part 2, different dentin cleaning agents (water, aluminum oxide, and pumice slurry) were tested after SDF application. The procedure was performed on the group that presented the worst values for MBS in Part 1. Fracture mode was evaluated under scanning electron microscope. Data were statistically analyzed by ANOVA. RESULTS: MBS was affected by the presence of caries and the type of material, with the conventional GIC the most affected (P< 0.05). Pumice slurry was superior in comparison to the other agents in cleaning SDF-treated dentin. Fracture evaluation showed more mixed failures in all the groups. CLINICAL SIGNIFICANCE: Clinicians should have caution when selecting the glass-ionomer cement (GIC) for restorations in silver diamine fluoride (SDF)-treated dentin. The mechanical properties of conventional GIC restorations were more affected than resin-modified GICs. Pumice slurry was the most effective cleaning method to minimize the negative effect of SDF on dentin.


Assuntos
Colagem Dentária , Cimentos de Ionômeros de Vidro , Dentina , Fluoretos Tópicos , Humanos , Teste de Materiais , Compostos de Amônio Quaternário , Cimentos de Resina , Compostos de Prata
13.
Niger J Clin Pract ; 23(7): 957-964, 2020 Jul.
Artigo em Inglês | MEDLINE | ID: mdl-32620725

RESUMO

Aim: The aims of this study were to evaluate the surface morphology and surface roughness of restorative materials containing glass ionomer, analyze Streptococcus mutans biofilm formation on the surface of materials, and determine the correlation between surface roughness and biofilm. Materials and Methods: Four restorative materials: resin-modified glass ionomer; giomer; amalgomer; and glass carbomer were used and for each material, 6 mm in diameter and 2 mm in thickness disc-shaped specimens were prepared to evaluate the surface morphology (n = 3), surface roughness (n = 16), and biofilm (n = 20). Surface morphology was analyzed with a scanning electron microscope. Surface roughness was evaluated via an atomic force microscope. The biofilm was evaluated by counting the colony-forming units. Surface roughness measurements were evaluated using a one-way analysis of variance and Tukey HSD test. Biofilm parameters were analyzed using the Kruskal-Wallis H and Mann-Whitney U test. Pearson's correlation test was used to determine the correlation between surface roughness and biofilm. Results: While the highest roughness values were obtained for amalgomer and glass carbomer, the lowest roughness values belonged to giomer and resin-modified glass ionomer. Statistically significant differences in the number of adherent bacteria were observed between the materials only on day 1. No statistically significant correlation was determined between surface roughness and biofilm. Conclusions: The resin content and small filler particle size of material positively affect surface roughness. However, there is no direct relationship between surface roughness and biofilm.


Assuntos
Apatitas/química , Biofilmes/crescimento & desenvolvimento , Resinas Compostas/farmacologia , Placa Dentária/prevenção & controle , Cimentos de Ionômeros de Vidro/química , Streptococcus mutans/crescimento & desenvolvimento , Resinas Acrílicas , Resinas Compostas/química , Placa Dentária/microbiologia , Restauração Dentária Permanente , Humanos , Teste de Materiais , Microscopia Eletrônica de Varredura , Dióxido de Silício , Streptococcus mutans/efeitos dos fármacos , Propriedades de Superfície
14.
J Clin Pediatr Dent ; 44(3): 148-153, 2020.
Artigo em Inglês | MEDLINE | ID: mdl-32644894

RESUMO

Objectives: This study compared the longevity of high strength posterior glass ionomer and metal-reinforced glass ionomer using ART in rural settings within an 18-month observation period. Study Design: A nonblinded parallel design randomized controlled trial was conducted among children who attended dental outreach programs in a rural area of Southern India. Atraumatic Restorative Treatment (ART) was performed in 92 permanent posterior teeth with either high strength posterior glass ionomer or metal-reinforced glass ionomer restorations. The allocation ratio was 1:1. Restorations were evaluated at 1, 6, 12 and 18 months after placement. Results: The success rate of metal-reinforced glass ionomer restorations was 100%, 95.4%, 90.4% and 87.2% as compared to high strength posterior glass ionomer whose success rates were 100%, 93%, 85% and 61.8% at the four follow ups respectively. There was a statistically significant difference between the success rate of the two materials at the end of 18 months with the metal-reinforced glass ionomer restorations having a higher success rate (p=0.015). Conclusions : Although the clinical performance of both materials were largely similar, the metal-reinforced glass ionomer restorations had a higher success rate than the conventional GIC at the end of 18 months of follow-up.


Assuntos
Tratamento Dentário Restaurador sem Trauma , Cárie Dentária , Criança , Restauração Dentária Permanente , Cimentos de Ionômeros de Vidro , Ouro , Humanos , Índia
15.
Oral Health Prev Dent ; 18(1): 319-323, 2020 Apr 01.
Artigo em Inglês | MEDLINE | ID: mdl-32618455

RESUMO

PURPOSE: The aim of this paper was to compare three conventional hand mixing glass-ionomer cements (GICs) and a new mechanical mixing glass-ionomer cement. MATERIALS AND METHODS: Samples were measured on days 1, 2, 6, 10, 31, 90 and 180. After 32 and 181 days of monitoring, the samples were recharged by using 1 ml of 2% sodium fluoride gel. RESULTS: The fluoride release started in high concentration during the first day for all GICs, with a value for GIII of 32.6 ppm. From the 2nd day, a slow, steady decline, with the exception of GII, which showed a marked decline to a value of 3.2 ppm. Analysis of variance (ANOVA) test showed statistically significant differences between the amounts of fluoride of the four materials in the first 24 h. Student t test was used to compare the fluoride release between the first and second recharge in each one of the study groups. Statistically significant differences were found when we compared the fluoride release in groups I (t = -16.95, p = 0.000) and IV (t = -2.644, p = 0.26). CONCLUSIONS: A mechanical mixing was the material with the more constant fluoride release and after recharge showed the highest fluoride release which make it an important benefit for clinicians.


Assuntos
Fluoretos , Cimentos de Ionômeros de Vidro , Humanos , Teste de Materiais , Fluoreto de Sódio
16.
J Indian Soc Pedod Prev Dent ; 38(2): 138-144, 2020.
Artigo em Inglês | MEDLINE | ID: mdl-32611859

RESUMO

Background: Use of silver diamine fluoride (SDF) after selective caries excavation can arrest the further progress of the carious lesion. Application of potassium iodide (KI) can reduce the staining due to SDF. Aim: The aim of the study was to evaluate the effect of the application of SDF, with and without acid etching and KI on the bond strength of resin-modified glass ionomer cement (RMGIC) to the carious dentin of primary teeth. Materials and Methods: In thisin vitro study, caries was induced on the occlusal surface by inoculating Streptococcus mutans strain in 36 extracted primary molars. The teeth were divided into four groups (n = 9), and the following treatments were done to the carious dentin prior to final restoration with RMGIC: Group I: 10% polyacrylic acid conditioner, Group II: 38% SDF, Group III: 37% phosphoric acid etchant followed by 38% SDF, and Group IV: 37% phosphoric acid etchant followed by 38% SDF and 10% potassium iodide solution. The microtensile bond strength was measured using universal testing machine. Failure modes were recorded using a scanning electron microscope. Results: There was no significant difference in microtensile bond strengths between the groups (P = 0.665), with the highest value seen in Group III. Conclusions: Application of SDF with or without acid etching and KI does not affect the bond strength of RMGIC to carious dentin of primary teeth.


Assuntos
Colagem Dentária , Cárie Dentária , Dentina , Adesivos Dentinários , Fluoretos Tópicos , Cimentos de Ionômeros de Vidro , Humanos , Teste de Materiais , Compostos de Amônio Quaternário , Cimentos de Resina , Compostos de Prata , Resistência à Tração , Dente Decíduo
17.
Acta Odontol Latinoam ; 33(1): 27-32, 2020 Apr 01.
Artigo em Inglês | MEDLINE | ID: mdl-32621596

RESUMO

The aim of this study was to assess the influence of different pre-treatment approaches on glass ionomer cement (GIC) bond strength (BS) to dentine. Sixty bovine incisors were allocated into six groups according to substrate - sound or caries-affected dentine; and substrate pre-treatment approach - no conditioning (control), polyacrylic acid for 10 s and phosphoric acid for 7 s. Teeth in the caries-affected dentine group were previously submitted to cariogenic pH-cycling challenge. After dentine pre-treatment, according to experimental groups, polyethylene tubes were placed on flat dentine surfaces and filled with GIC. Teeth were stored in distilled water for 24 h at 37 °C and then submitted to microshear test (0.5 mm/min). Failure pattern analysis was performed under stereomicroscope (400x). Data were analysed using two-way ANOVA and Tukey's test (α=5%). Statistically significant differences were found for the pre-treatment approach, regardless of substrate (p<0.001). The polyacrylic acid group and control group had similar BS values, and were both better than the phosphoric acid group. In general, GIC had better bonding performance in sound dentine than in caries-affected dentine. In conclusion, dentine pre-treatment with polyacrylic acid did not improve the performance of GIC restoration on clinically relevant substrates.


Assuntos
Resinas Acrílicas/farmacologia , Colagem Dentária/métodos , Dentina/efeitos dos fármacos , Cimentos de Ionômeros de Vidro/química , Animais , Bovinos , Infiltração Dentária/prevenção & controle , Dentina/diagnóstico por imagem , Dentina/patologia , Teste de Materiais
18.
J Contemp Dent Pract ; 21(5): 543-548, 2020 May 01.
Artigo em Inglês | MEDLINE | ID: mdl-32690837

RESUMO

AIM: To assess the influence of three probiotic mouthrinses on the microhardness of three esthetic materials used for teeth restorations. MATERIALS AND METHODS: Thirty specimens of each material: conventional glass ionomer cement (GIC), resin-modified glass ionomer, and resin composite were randomly assigned to three groups. Surface microhardness was measured at baseline. The specimens were immersed in probiotic mouthrinses, group I: (P2 probiotic power), group II: (Probioclean), and group III (BoKU natural). Microhardness was measured after 21 and 63 minutes of immersion which is comparable with 3 and 9 weeks of mouthrinse use every day, respectively. Measurements of microhardness were completed using Micro Vickers testing machine with a 200 g load applied for a duration of 15 seconds. RESULTS: The microhardness change of the three restorative materials reveled statistically significant differences in all mouthrinse groups (p = 0.001). BoKU natural mouthrinse decreased microhardness significantly in all restorative materials (p < 0.05). However, Probioclean mouthrinse was associated with an increase in microhardness in all restorative materials. The effect of P2 probiotic power mouthrinse varied depending on time cycles and the restorative material. The mean difference in mouthrinse groups of resin composite was highest in BoKU natural at immersion time of 63 minutes. While no mean difference was seen in P2 probiotic power group at immersion time of 21 minutes which had no effect on the microhardness of resin composite. CONCLUSION: Surface microhardness was affected by immersion in probiotic mouthrinses. The BoKU natural mouthrinse had the highest reduction, while resin composite showed the least change in surface microhardness. CLINICAL SIGNIFICANCE: There is lack of studies that investigated the effect of probiotics mouthrinses on the surface properties of restorative materials. This study showed evidence that some of the tested probiotic mouthrinses in this study decreased the microhardness of the tested tooth-colored restorative materials after immersion for 21 and 63 minutes which is equivalent to 3 and 9 weeks of everyday use.


Assuntos
Probióticos , Resinas Compostas , Restauração Dentária Permanente , Estética Dentária , Cimentos de Ionômeros de Vidro , Dureza , Teste de Materiais , Propriedades de Superfície
19.
Niger J Clin Pract ; 23(6): 792-797, 2020 Jun.
Artigo em Inglês | MEDLINE | ID: mdl-32525113

RESUMO

Background: There is no information about the shear bond strengths (SBS) of zirconia ceramic to primary tooth dentin. Aim: To investigate the effect of different surface treatments and cements on the shear bond strength (SBS) of zirconia ceramic to primary tooth dentin. Materials and Methods: Prepared zirconia bars were distributed into four groups according to surface treatment procedure: control, sandblasting, CoJet and hot etching. The zirconia specimens in each group were further divided into subgroups according to cement (n = 13): self-adhesive resin (Rely-X Unicem), resin-modified glass ionomer (Ketac-Cem Plus), and universal bioactive (BioCem). Zirconia specimens were bonded to the primary tooth dentin surface by cement. SBS was measured, and the data were subjected to two-way ANOVA and Tukey's tests. Results: Statistical differences were observed in the surface treatment procedures for Rely-X Unicem (P < 0.05), but no statistically significant differences were found in the sandblasting, CoJet and hot-etching groups for Ketac-Cem Plus (P > 0.05). For BioCem, the SBS value for the hot etching group was significantly lower than those for the CoJet and sandblasting groups (P < 0.05). The SBS values for the Rely-X Unicem subgroups (sandblasting, CoJet and hot etching) were significantly higher than those for the other cements (P < 0.05). Conclusion: The bond strength of zirconia ceramic to primary tooth dentin is affected by surface treatments and cements.


Assuntos
Cerâmica/química , Colagem Dentária , Dentina , Cimentos de Resina/química , Resistência ao Cisalhamento , Dente Decíduo , Zircônio/química , Resinas Acrílicas , Adesivos , Cimentos de Ionômeros de Vidro , Humanos , Teste de Materiais , Dióxido de Silício , Propriedades de Superfície
20.
J Evid Based Dent Pract ; 20(2): 101437, 2020 06.
Artigo em Inglês | MEDLINE | ID: mdl-32473806

RESUMO

ARTICLE TITLE AND BIBLIOGRAPHIC INFORMATION: Clinical performance of glass ionomer cement and composite resin in class II restorations in primary teeth: A systematic review and meta-analysis. Dias AGA, Magno MB, Delbem ACB, Cunha RF, Maia LC, Pessan JP. J Dent 2018;73:1-13. SOURCE OF FUNDING: Information not available. TYPE OF STUDY/DESIGN: Systematic review with meta-analysis of data.


Assuntos
Cárie Dentária , Cimentos de Ionômeros de Vidro , Resinas Compostas , Restauração Dentária Permanente , Humanos , Dente Molar , Dente Decíduo
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