Efficiency of cavitary varnishes containing experimental bioglass particles in the occlusion of dentinal tubules.

This research aims to evaluate the efficiency of cavitary varnishes containing experimental bioglasses in the occlusion of dentinal tubules. One hundred and sixty-eight cervical buccal dentin samples were obtained from bovine teeth. Samples were randomized into the following groups: I. Distilled Water (DW); II. Cavity Varnish (CV); III. Colgate® Sensitive Pro-Relief™ (CS); IV. 45S5 Bioglass (45S5); V. KSr Bioglass strontium potassium (KSr); VI. P Bioglass phosphorus (P); and VII. PSi Bioglass phosphorus silica (PSi). The treatments were applied to the surfaces of the samples, which were then subjected to simulated brushing. The samples were analyzed for a) characterization of bioactive glasses; b) surface roughness; c) descriptive analysis of the dentin surface; d) total versus occluded number of dentinal tubules; e) diameter of the dentinal tubules; f) chemical composition of the dentin surfaces, and g) dentin permeability. All groups treated with biomaterials without the brushing challenge showed an increase in roughness and (total or partial) occlusion of the dentinal tubules. The PSi group had the best values for occlusion, while the KSr group had the highest calcium and phosphorus concentrations. After the brushing challenge the roughness was controlled by the presence of biomaterials; 45S5, KSr, and PSi showed occlusion of the dentin tubules. All bioactive glasses showed reduced tooth permeability compared to distilled water. The PSi group had the smallest tubule diameter and highest phosphorus concentration. KSr and PSi bioglasses are promising materials for dentin occlusion and remineralization and are promising new biomaterials for the treatment of dentin hypersensitivity.

Bioactive glass and arginine dentifrices reduce root sensitivity during daily activities following non-surgical periodontal therapy: A randomized controlled trial.

BACKGROUND: Evidence on the efficacy of calcium sodium phosphosilicate (CSPS) and arginine dentifrices on reducing root sensitivity (RS) following non-surgical periodontal therapy (NSPT) is limited. The aim of this study was to compare the efficacy of these dentifrices in reducing RS during daily activities in patients undergoing NSPT. METHODS: Using a double-blind randomized controlled trial, CSPS, arginine, or control dentifrices were randomly assigned to 45 RS individuals following NSPT. The participants used the dentifrices 2×/day for 8 weeks. A self-reported visual analog scale (VAS) was assessed during daily activities. RESULTS: Self-reported VAS scores were similar among the three groups at each time point. The with-in group analysis revealed that the arginine dentifrice reduced RS from Week 1-8 compared with baseline in response to cold. Similarly, the CSPS dentifrice reduced RS at Week 4 and 8. The CSPS and arginine dentifrices exhibited RS relief resulting from toothbrushing starting at Week 4 and 2, respectively. In response to air, RS relief was observed from Week 4 in the arginine group. The number of patients with VAS > 2 in response to cold declined at Week 2 and 4 in the CSPS and arginine groups, respectively. In response to toothbrushing, only 10% in the test groups still had RS at Week 8. In response to air, the number of RS patients only in the arginine group decreased at Week 4. CONCLUSION: The CSPS and arginine dentifrices provided comparable RS relief during daily activities within 2-4 weeks and remained effective up to 8 weeks.

Dentists' education, knowledge, and professional behavior concerning the diagnosis and treatment of dentin hypersensitivity: An exploration.

OBJECTIVES: Dentin hypersensitivity (DH) affects patients' oral health-related quality of life, but is not always optimally treated in dental offices. The objectives were to assess dentists' DH-related education, knowledge, and professional behavior and explore relationships between education, knowledge, and behavior. METHODS: Survey data were collected from 220 ADA members in the United States. Descriptive and correlational analyses were performed. RESULTS: About half of the respondents agreed/strongly agreed that their dental school had educated them well about diagnosing DH in classroom-based (53.6%) and clinical settings (48.9%). Lower percentages agreed being well educated about treating DH (40.9%/37.3%). The majority self-educated themselves about DH after dental school by attending continuing education courses in person or online (60.6%/36.8%), reading articles (64.1%), or consulting with colleagues (59.6%). The majority knew that patients with DH describe their pain as stimulated (91.4%) and that recessed gingiva (89.6%), abrasion lesions (72.3%), tooth whitening (63.1%), erosion lesions (58.6%), and abfraction lesions (51.4%) are risk factors for DH. The majority diagnosed DH with patient self-reporting, confirmed by exams (81.8%), applying air blasts (53.7%), or cold-water (52.3%). They treated patients with DH often/very often with over-the-counter desensitizing agents (90%), and prescribing fluoride formulations toothpaste (82.8%) and/or potassium nitrate toothpastes (60.9%). In their offices, the majority (73.2%) educated their patients often/very often about DH and used fluoride dental varnish for treating DH (71.8%). The more recently respondents had graduated from dental school, the more positively they described their dental school education (r = 0.14; p < 0.05), the more ways to diagnose DH they used (r = 0.16; p < 0.05) and the more often they used fluoride dental varnish in their offices (r = 0.23; p < 0.001). The more dentists had educated themselves, the more methods for diagnosing DH they used (r = 0.23; p < 0.001) and the more often they used potassium oxalate products (r = 0.19; p < 0.01), Arginine/calcium products (r = 0.19; p < 0.01) and dentin bonding (r = 0.22; p < 0.001). CONCLUSIONS: More recently graduating from dental school correlates with more positive evaluations of DH-related dental school education. The finding that most dentists engage in self-education about DH after dental school should motivate dental educators to increase education about this topic not only in dental school, but also in continuing education courses.

The effect of combination treatment of CO2-laser irradiation and tetracalcium phosphate/dicalcium phosphate anhydrate on dentinal tubules blockage: an in vitro study.

The aim of this study was the evaluation of the in vitro efficacy of a carbon dioxide (CO2) laser, a tetracalcium phosphate/dicalcium phosphate anhydrate (TP/DP) desensitizer and the combination of the desensitizer and additional CO2 laser irradiation as a treatment modality for cervical dentin hypersensitivity. A total of 48 dental specimens, prepared from extracted human premolars and molars, were divided into four groups: a control group, a TP/DP desensitizer paste group, a CO2 laser (10.600-nm wavelength) group, and a paste and laser group. The specimens were coated with nail varnish except in the marked area and were then immersed in 2% methylene blue dye for 1 h. The specimens were then washed, dried, and cut longitudinally. Thereafter, photos of 40 dentin specimens were taken and evaluated. The area of penetration was assessed and reported as percentage of the dentin surface area. Additionally eight dental specimens were examined with the aid of a scanning electron microscope and evaluated. Significant differences in the penetration depth were found for all experimental groups compared to the control group. The lowest penetration area was detected in the paste-laser group (16.5%), followed by the laser (23.7%), the paste (48.5%), and the control group (86.2%). The combined treatment of the CO2 laser and a TP/DP desensitizer was efficient in sealing the dentinal surface and could be a treatment option for cervical dentin hypersensitivity.

Use of calcium-containing bioactive desensitizers in dental bleaching: A systematic review and meta-analysis.

BACKGROUND: Topical application of calcium-containing bioactive desensitizers (CBs) has been used to minimize bleaching-induced tooth sensitivity (TS). This study answered the research question "Is the risk of TS lower when CBs are used with dental bleaching in adults compared with bleaching without desensitizers?" TYPES OF STUDIES REVIEWED: The authors included randomized clinical trials comparing topical CB application with a placebo or no intervention during bleaching. Searches for eligible articles were performed in MEDLINE via PubMed, Cochrane Library, Brazilian Library in Dentistry, Latin American and Caribbean Health Sciences Literature, Scopus, Web of Science, Embase, and gray literature without language and date restrictions and updated in September 2022. The risk of bias was evaluated using Risk of Bias Version 2.0. The authors conducted meta-analyses with the random-effects model. The authors assessed heterogeneity with the Cochrane Q test, I2 statistics, and prediction interval. The authors used the Grading of Recommendations Assessment, Development and Evaluation approach to assess the certainty of the evidence. RESULTS: After database screening, 22 studies remained, with most at high risk of bias. No difference in the risk of TS was detected (risk ratio, 0.95; 95% CI, 0.90 to 1.01; P = .08, low certainty). In a visual analog scale, the intensity of TS (mean difference, -0.98; 95% CI, -1.36 to -0.60; P < .0001, very low certainty) was lower for the CB group. The color change was unaffected (P > .08). PRACTICAL IMPLICATIONS: Although topical CB dental bleaching did not reduce the risk of TS and color change, these agents slightly reduced the TS intensity, but the certainty of the evidence is very low.

Effect of an experimental desensitizing gel on bleaching-induced tooth sensitivity after in-office bleaching-a double-blind, randomized controlled trial.

OBJECTIVES: To evaluate the risk and intensity of tooth sensitivity (TS), and the efficacy of in-office bleaching after applying an experimental desensitizing gel composed of 10% calcium gluconate, 0.1% dexamethasone acetate, 10% potassium nitrate, and 5% glutaraldehyde. MATERIAL AND METHODS: In a split-mouth, double-blind, placebo-controlled study, 50 participants had their upper hemiarches randomized into experimental and placebo groups. Desensitizing and placebo gels were applied for 10 min before in-office bleaching (35% hydrogen peroxide, 1 × 50 min; two bleaching sessions; 1-week interval). TS was recorded immediately after bleaching, 1, 24, and 48 h after each session, with a 0-10 visual analogue scale (VAS) and a five-point numerical rating scale (NRS). The color was recorded in all groups at baseline, 1 week after each session, and 1 month after the end of bleaching using shade guide units (ΔSGUs) and a spectrophotometer (ΔEab, ΔE00, and ΔWID). RESULTS: Most participants (96%) felt some discomfort during treatment regardless of the study group. The odds ratio for pain was 0.65 (95% CI 0.1 to 4.1; p = 1.0). The intensity of TS did not differ between groups (p > 0.31), and it was only 0.34 VAS units lower in the experimental group. A significant color change occurred in both groups regardless of the group. CONCLUSIONS: The desensitizing experimental gel applied before in-office bleaching did not reduce the risk and the intensity of TS and did not affect color change. CLINICAL RELEVANCE: Although the experimental desensitizing agent with varying mechanisms of action did not jeopardize the color change, it did not reduce the risk or intensity of in-office bleaching. CLINICAL TRIAL REGISTRATION NUMBER: RBR-7T7D4D.

The 100 Most-Cited Papers in Dentin Hypersensitivity: A Bibliometric Analysis

ABSTRACT Objective: To identify the 100 most-cited articles in DH and analyze their characteristics. Material and Methods: A search was performed on the Web of Science (WoS) and the 100 most-cited articles were selected. The following data were extracted: citations, year of publication, authorship, institution, country, journal, language, study design, topic of interest, conflict of interest (COI), and sponsorship. The VOSviewer software was used to visualize bibliometric networks. Poisson regression analysis was performed to measure associations between several citations and the characteristics of the studies. Results: The number of citations ranged from 346 to 48. The most-cited article was published in 1997 by Holland in the Journal of Clinical Periodontology. This journal published the most papers, followed by the Journal of Oral Rehabilitation and Journal of Dentistry. Laboratory research, review, and clinical trial were the study designs most prevalent. Reviews (p<0.05; PR= 1.853) and method development studies (p<0.05; PR= 1.853) had a more chance to present more citations. The main topics of interest were the clinical effectiveness of desensitizers and in vitro analysis of dentin morphology. Sponsorship and COI were underreported. England and USA presented the greatest number of citations and connections in the coauthorship network map. Conclusion: Most of the articles were original research, and their topics of interest were mainly the clinical effectiveness of desensitizing agents and dentin morphology.

Effect of Iontophoresis on the Effectiveness of Nano-Hydroxyapatite and Pro-argin in In-Office Treatment of Dentin Hypersensitivity: A Split-Mouth Randomized Clinical Trial.

Background and objectives Dentin hypersensitivity (DH) treatment is one of the main challenges dentists face in their daily clinical practice. Current therapies provide only temporary relief and require multiple applications to exhibit results, and there is a lack of evidence related to the long-term effects of these agents. Nano-hydroxyapatite (n-HA) and pro-argin (8.0% arginine-calcium carbonate) have recently been used for dentin desensitization with a one-time in-office application, but the effects are interim. However, a standard treatment protocol demands definitive or enduring results. Since iontophoresis amplifies the transport of neutral and ionized drugs across a membrane, the use of these desensitizing agents with iontophoresis may be beneficial to accomplish satisfactory results. This study was conducted to evaluate whether iontophoresis could enable better penetration of nano-hydroxyapatite and pro-argin into the dentin, enhancing and prolonging their therapeutic effect. Materials and methods Forty-five participants with dentin hypersensitivity in the age group of 20 to 60 years were included. In each individual, four teeth with cervical lesions (one from each quadrant) were selected and divided randomly into four groups: group I: desensitizing paste containing nano-hydroxyapatite, group II: desensitizing paste containing nano-hydroxyapatite with iontophoresis, group III: desensitizing paste containing pro-argin, and group IV: desensitizing paste containing pro-argin with iontophoresis; followed by one-time application of the agents. Sensitivity was assessed by tactile, air blast, and cold-graded thermal tests (CGTTs) before and immediately after application, after one week, and at the end of the first, third, and sixth months. Statistical analysis Statistical analysis was done by repeated measures ANOVA for within-group comparison. Intergroup comparison was done using one-way ANOVA and Tukey's post-hoc test. Results All the groups showed a statistically significant reduction in dentin hypersensitivity (p<0.001). The reduction in hypersensitivity in various groups can be graded as group II (3.578/1.800/1.556) > group IV (3.367/1.755/1.555) > group I (2.3781/1.022/0.822) > group III (2.222/0.911/0.778) as evaluated by tactile, air blast, and cold-graded thermal tests, respectively. Group II and group IV presented a significant reduction in sensitivity levels consistent for up to six months. Conclusion Nano-hydroxyapatite and pro-argin can be used effectively for reducing dentin hypersensitivity. Iontophoresis can be a valuable adjunct for their improved delivery, enhancing and prolonging their effectiveness.

Ensaios clínicos randomizados sobre tratamentos de hipersensibilidade dentinária ­ conformidade com as diretrizes do CONSORT e mapeamento das características dos estudos: uma revisão sistemática / Randomized clinical trials of dentin hypersensitivity treatments ­ compliance with CONSORT guidelines and mapping of trials features: a systematic review

A hipersensibilidade dentinária (HD) é definida como uma dor aguda, de curta duração, que ocorre em resposta à estímulos externos direcionados a áreas de dentina exposta. Esta revisão sistemática objetivou avaliar a literatura disponível quanto à conformidade dos ensaios clínicos randomizados (ECRs) sobre tratamentos de HD com a Declaração CONSORT, além de realizar um mapeamento de suas características (tipo de intervenção, métodos de avaliação de sensibilidade, escalas utilizadas, modo de aplicação etc.), e analisar o risco de viés destes mesmos estudos. Apenas ECRs entraram nesta revisão. Foi traçada uma estratégia de busca específica para cada bases de dados: MEDLINE via PubMed, Scopus, Web of Science, LILACS, Biblioteca Brasileira em Odontologia (BBO) e EMBASE, além das buscas manuais. A análise e coleta de dados foram realizadas por dois revisores independentes que selecionaram os estudos em potencial primeiro pelo título e resumo e, após, pela leitura completa dos selecionados. Os artigos foram avaliados quanto à conformidade ao CONSORT em uma escala: 0 = sem descrição, 1 = descrição deficiente e 2 = descrição adequada, para cada item. Análise do risco de viés dos artigos foi realizada através da plataforma The Risk Of Bias Tool 2.0. Análises descritivas também foram realizadas. Dos 3078 artigos analisados, 2867 foram excluídos por não atenderem aos critérios de inclusão, não apresentarem comparação entre tratamentos ou não serem ECRs. Após as exclusões, 211 ECRs permaneceram para avaliação. Os periódicos que mais contribuíram foram o American Journal of Dentistry (13,7%) e Journal of Dentistry (8,5%). Os países com mais publicações foram a Índia (24,6%), seguido pelo Brasil (17,5%). Quanto à pontuação dos artigos para cada item CONSORT analisado, 92,42% dos artigos obtiveram pontuação máxima em "Elegibilidade", demonstrando haver uma descrição clara dos critérios de elegibilidade para participantes na maioria dos estudos. O item com menor quantidade de artigos com pontuação máxima foi "Tamanho do efeito estimado" (25,6%), demonstrando uma certa dificuldade dos autores em descrever adequadamente o tamanho do efeito estimado do(s) desfecho(s) e sua precisão com um intervalo de confiança de 95%. A maioria dos artigos apresentou risco "incerto" de viés. Com as análises feitas, concluiu-se que a adesão dos ECRs ao CONSORT requer mais atenção, uma vez que seguir suas diretrizes pode, a longo prazo, resultar em uma melhoria significativa dos relatos de ECRs, o que acarretará inúmeros benefícios tanto para a ciência acerca do tema, quanto para a posterior aplicação clínica (AU)

Dentin hypersensitivity (DH) is defined as an acute, short-term pain that occurs in response to external stimuli directed at areas of exposed dentin. This systematic review aimed to assess the available literature regarding the compliance of randomized clinical trials (RCTs) on DH treatments with the CONSORT statement, in addition to mapping their characteristics (type of intervention, sensitivity assessment methods, scales used, application mode, etc.), and to analyze the risk of bias of these same studies. Only RCTs were included in this review. A specific search strategy was designed for each of the following databases: MEDLINE via PubMed, Scopus, Web of Science, LILACS, Brazilian Dental Library (BBO) and EMBASE, in addition to manual searches. Data analysis and collection were performed by two independent reviewers who selected the potential studies at first by title and abstract, then by complete reading of the selected ones. Articles were evaluated for compliance with the CONSORT statement on a scale: 0 = no description, 1 = deficient description and 2 = adequate description, for each item. Analysis of the risk of bias was performed using The Risk Of Bias Tool 2.0. Descriptive analyzes were also performed. Among the 3078 articles analyzed, 2867 were excluded because they did not meet the inclusion criteria, did not present a comparison between treatments, or were not RCTs. After deletions, 211 RCTs remained for evaluation. The journals that most contributed were the American Journal of Dentistry (13.7%), Journal of Dentistry (8.5%%) and the Journal of Clinical Dentistry (7.1%). India (24.6%) and Brazil (17.5%) were the countries with the most publications. As for the score received by the articles for each CONSORT item analyzed, 92.42% of the articles obtained the maximum score in "Eligibility", demonstrating that there is a clear description of the eligibility criteria for participants in most studies. The item with the lowest number of articles with the maximum score was "Estimated effect size" (25.6%), demonstrating a particular difficulty for authors to adequately describe the estimated effect size of the outcomes and its precision with a confidence interval of 95%. Most articles presented an "uncertain" risk of bias. After these analyses, it was concluded that the adherence of RCTs to CONSORT requires more attention, since following its guidelines can, in the long term, result in a significant improvement in RCT reports, which may bring numerous benefits both to the science on the subject, as well as for the clinical application of what is being studied. (AU)

Effect of different toothpastes on permeability and roughness of eroded dentin / Efeito de diferentes cremes dentais na permeabilidade e rugosidade da dentina erodida

ABSTRACT Dentin hypersensitivity (DH) is characterized by rapid, acute pain arising from exposed dental tubules. Aim: the aim of this study was to evaluate the roughness, tubule occlusion, and permeability of eroded dentin brushed with different toothpastes. Materials and Method: ninety bovine teeth were cut into blocks. Thirty hemifaces were protected with varnish and the other sixty were submitted to permeability tests. Specimens were divided into groups according to the dentifrices: without fluoride (WF), sodium fluoride (NaF), and stannous fluoride (SnF2). The blocks were subjected to a 5-day erosive-abrasive protocol. Surface roughness and dentinal tubule occlusion (n=10) were assessed for both control and test hemifaces of the same sample along with permeability analysis (n=20). Two-way RM ANOVA and Tukey's post-hoc test were performed (p≤0.05). Results: NaF and SnF2 presented higher roughness than WF. The number of open tubules was higher in WF. Permeability was higher in SnF2, but there was no significant difference between WF and NaF. Conclusions: both fluoride toothpastes occluded dentinal tubules and increased roughness. NaF toothpaste promoted greater decrease in dentin permeability.

RESUMO A hipersensibilidade dentinária (HD) é caracterizada por dor rápida e aguda decorrente de túbulos dentais expostos. Objetivo: este estudo teve como objetivo avaliar a rugosidade, oclusão tubular e permeabilidade da dentina erodida escovada com diferentes dentifrícios. Materiais e Método: noventa dentes bovinos foram seccionados em blocos. Trinta hemifaces foram protegidas com verniz e outras sessenta foram submetidas à permeabilidade. Os espécimes foram divididos em grupos de acordo com os dentifrícios: sem flúor (SF), fluoreto de sódio (NaF) e fluoreto estanoso (SnF2). Em seguida, os blocos foram submetidos a um protocolo erosivo-abrasivo de 5 dias. A rugosidade da superfície e a oclusão do túbulo dentinário (n = 10) foram avaliadas para ambas as hemifaces de controle e teste da mesma amostra, também realizou-se a análise de permeabilidade (n = 20). Two-way RM ANOVA e pós-teste de Tukey foram realizados (p≤0,05). Resultados: NaF e SnF2 apresentaram rugosidade superior ao SF. O número de túbulos abertos foi maior em SF. Não encontramos diferenças significativas entre SF e NaF em relação à permeabilidade; entretanto, SnF2 apresentou maior permeabilidade. Conclusão: ambos os dentifrícios fluoretados foram capazes de ocluir os túbulos dentinários e aumentar a rugosidade. No entanto, o dentifrício NaF promoveu uma maior diminuição da permeabilidade dentinária.

Resin-based materials to control human dentin permeability under erosive conditions in vitro: A hydraulic conductance, confocal microscopy and FTIR study.

OBJECTIVES: To characterize the behavior of three different polymeric agents before and after an erosive challenge on dentin permeability, to analyze their degradation in both conditions, and to analyze their degree of conversion (DC). METHODS: The permeability of human dentin disks (1.0 ± 0.2 mm) was measured with smear layer, after its removal, after treatment (LpTreat) with Gluma Desensitizer, PRG Barrier Coat (PBC) or Icon infiltrant (n = 11/group) and after exposure to citric acid (LpEro) (6%, pH 2.1, 1 min). The specimens were analyzed under a Laser Scanning Confocal Microscope (n = 2/group) and the products' DC were calculated. Data were subjected to 2-way repeated measures ANOVA and post-hoc Bonferroni (permeability analysis), to paired t-test (for specimens treated with Icon) and to t-test (DC analysis) (α < 0.05). RESULTS: Icon showed the lowest LpTreat and LpEro values, while PBC and Gluma did not differ from each other under these conditions. Icon and PBC showed LpEro similar to a dentin with smear layer. Under the Laser Scanning Confocal Microscope, more deposits were noticeable on dentin after treating with PBC. Gluma presented the deepest penetration in dentin. The DC of PBC was the highest. SIGNIFICANCE: Icon caused the highest reduction on permeability values, followed by PBC and Gluma. PBC generated more deposits covering dentin and seemed to be more efficient after an erosive challenge. The association of a polymeric resin with inorganic ion-releasing fillers seem to be a great strategy to manage dentin hypersensitivity under erosive conditions.

Experimental pastes containing niobophosphate and 45S5 bioactive glasses for treatment of dentin hypersensitivity: dentin permeability and tubule obliteration.

OBJECTIVES: This study tested the ability of bioactive pastes containing niobophosphate and 45S5 glasses to reduce dentin permeability and to obliterate dentinal tubules, as a mean of reducing human dentin hypersensitivity. MATERIALS AND METHODS: Experimental pastes with concentrations of 10, 20, and 30 wt% of two bioactive glasses (45S5 or niobophosphate [NbG]) were formulated. A paste without bioactive glass (placebo) and a commercial paste (Nano P, FGM) were used as controls. Forty dentin disc specimens were obtained from caries-free extracted third human molars and divided in 8 groups (n = 5). Percentage of permeability (%Lp) was assessed in a dental permeability machine considering hydraulic conductance, immediately after pastes application and at day 7, day 14, and day 21. The precipitates formed on the surface of the dentin discs (and dentinal tubules) were analyzed by SEM/EDS and micro-Raman spectra. Data of dentin permeability (%) 2-way repeated-measures (ANOVA) and Holm-Sidak post-tests (α = 0.05). Dentinal tubule obliteration was visually (and elemental) evaluated and descriptively reported. RESULTS: The experimental bioactive glass pastes containing NbG and 45S5, regardless of the concentration, reduced dentin permeability in comparison with pastes without bioactive glasses (P < 0.05). The formulated placebo and commercial paste did not reduce permeability over time (P < 0.05). SEM/EDS and micro-Raman analyses showed that both type of bioactive pastes (NbG or 45S5-based) presented mineral precipitates obliterating the dentinal tubules at day 21. NbG seems to offer a better initial effect than 45S5, while at 21 days there is no difference between both glasses. CONCLUSION: Experimental bioactive pastes containing NbG and 45S5 (at concentrations of 10%, 20%, or 30%) have potential to reduce dentin permeability (over time) in comparison with pastes without bioactive glasses; and this occurs on behalf of obliteration of dentinal tubules by microparticle and precipitate formation. CLINICAL RELEVANCE: Bioactive pastes containing NbG and 45S5 may benefit patients presenting dentin hypersensitivity, because these pastes can start acting fast after application and maintain their action up to 21 days.

Post-Operative Sensitivity and Color Change Due to In-Office Bleaching With the Prior Use of Different Desensitizing Agents: A Systematic Review.

Bleaching agents can cause certain surface alterations on the enamel, such as depressions, surface porosity, and surface irregularities; this makes the dentin more susceptible to post-operative tooth sensitivity (PoS). In addition, the presence of flawed or leaky restorations, gingival recession, or defects in the cementoenamel junction can also cause severe tooth sensitivity post tooth bleaching.Hence, the current study aimed to perform a systematic review to determine the efficacy of various desensitizing agents (DA) in managing post-operative tooth sensitivity and color alteration when applied before in-office bleaching procedures. Randomized clinical trials were searched to conduct an SR where the post-operative tooth sensitivity was evaluated after in-office bleaching with various desensitizing agents used before the procedure. Post-operative pain assessment was measured using the Visual Analogue Scale (VAS). Outcomes were evaluated up to an hour and 24 hours post the procedure. Out of 163 articles, only 13 titles were selected that met the eligibility criteria. Eight hundred and forty-one adult patients with vital pulp status were included. The participants receiving prior desensitizing agent applications reported significantly lower pain scores in the VAS reports. The most significant reduction of post-operative sensitivity was observed in the immediate (up to an hour) and 24 hours after the in-office bleaching. The popular desensitizing agent that could manage post-operative tooth sensitivity (TS) is 5% potassium nitrate and 2% sodium fluoride used before the in-office bleaching procedure.

The Effect of Commercially Available Desensitizers on Bond Strength Following Cementation of Zirconia Crowns Using Self-Adhesive Resin Cement-An In Vitro Study.

The improvement of the tensile strength of zirconia crowns after the application of commercially available desensitizers can provide added advantages for the durability and strength of zirconia prostheses. We assessed the retention of zirconia crowns when Gluma, Shield Force Plus, and Telio CS desensitizers were used with resin luting cement. Four groups with ten specimens each (n = 10) were considered as Group 1 (Control group, with no desensitizer application before crown cementation with resin cement) and Groups 2, 3, and 4 (with a single coat of Gluma dentin desensitizer, Telio CS desensitizer, or Shield Force Plus desensitizer applied before crown cementation, respectively). Thermocycling was then carried out, and each group was tested to determine the associated retentive forces and type of failure. The data were statistically analyzed, which showed that the mean tensile-strength values were significantly higher in Group 2 (p-value = 0.001), Group 3 (p-value = 0.027), and Group 4 (p-value = 0.014), when compared with the Control group. Clinicians should consider the application of any of these three desensitizers, as they can successfully abate dentin hypersensitivity after tooth preparation, as well as increase the durability and strength of the zirconia prosthesis.

Bioactive glass and arginine dentifrices immediately relieved dentine hypersensitivity following non-surgical periodontal therapy: A randomized controlled trial.

BACKGROUND: There is no report concerning calcium sodium phosphosilicate (CSPS) and arginine dentifrices in reducing dentine hypersensitivity (DH) in patients undergoing non-surgical periodontal therapy. The aim of the study was to compare the efficacy of a dentifrice containing bioactive glass, 5% CSPS, and 8% arginine dentifrice in relieving DH in patients undergoing non-surgical therapy. METHODS: Using a double-blind randomized controlled trial, 45 volunteers with DH following non-surgical therapy were immediately applied with one of three dentifrices containing: 5% CSPS, 8% arginine, or control on DH teeth. The participants then continued to brush twice daily for 8 weeks. DH was assessed using the Schiff cold air sensitivity scale and tactile tests at baseline, immediately after application, and up to 8 weeks. RESULTS: The Schiff analysis revealed that the CSPS dentifrice significantly reduced DH immediately and declined through week 8. The arginine group demonstrated reduced DH through week 2. In contrast, DH reduction in the control began later at week 1. The visual analog scale analysis demonstrated that only CSPS had a significantly reduced percentage DH at the immediate, 2, 4, and 8 weeks compared with the baseline. The percentage of patients with DH (Schiff score ≥2) in the CSPS and arginine groups reduced to ≈ 50% after the in-office application. The number of DH patients treated with CSPS then decreased to 9% at the 2-week evaluation. CONCLUSION: The CSPS and arginine dentifrices were beneficial in reducing periodontitis patient's discomfort, immediately and in the first 2 weeks following non-surgical periodontal therapy.

Nano eggshell-titanium-dioxide biocomposite in occluding opened dentine tubules.

It is of interest to synthesize Nano eggshell-titanium-dioxide (EB@TiO2) biocomposite and to evaluate its effectiveness in occluding opened dentine tubules. EB@TiO2 was synthesized and characterized using X-ray diffraction (XRD), and Transmission Electron Microscope (TEM). Sixteen simulated bovine dentine discs were prepared and randomly assigned into four groups according to the following treatment (n = 4): Group 1: No treatment; Group 2: eggshell powder; Group 3: EB@TiO2; and Group 4: GIC mousse. These were then, agitated in a solution of 1g powder and 40mL water for 3hours. Thereafter, each dentine discs from the respective groups were post-treated for 5 min with 2wt% citric acid to test their acid resistant characteristics. Scanning Electron Microscope (SEM) was used to observe the effectiveness of occluded dentine pre-treatment and post-treatment. The cytotoxicity of the synthesized EB@TiO2 was tested using NIH 3T3 assay. ANOVA was used to evaluate the mean values of the occluded area ratio and the data of MTS assay. This was followed by a multi-comparison test with Bonferroni correction (α = .05). The XRD confirmed that EB@TiO2 was successfully modified through ball-milling. The TEM revealed the presence of both spherical and irregular particle shape powders. The SEM result showed that EB@TiO2 could effectively occlude open dentine tubules. Equally, the result demonstrated that EB@TiO2 exhibited the highest acid resistant stability post-treatment. NIH 3T3 assay identified that EB@TiO2 had little effect on the NIH 3T3 cell line even at the highest concentration of 100µg/ml. This study suggests that the application of EB@TiO2 effectively occluded dentine tubules and the occlusion showed a high acid resistant stability.

Effect of different toothpastes on permeability and roughness of eroded dentin.

Dentin hypersensitivity (DH) is characterized by rapid, acute pain arising from exposed dental tubules. AIM: the aim of this study was to evaluate the roughness, tubule occlusion, and permeability of eroded dentin brushed with different toothpastes. MATERIALS AND METHOD: ninety bovine teeth were cut into blocks. Thirty hemifaces were protected with varnish and the other sixty were submitted to permeability tests. Specimens were divided into groups according to the dentifrices: without fluoride (WF), sodium fluoride (NaF), and stannous fluoride (SnF2). The blocks were subjected to a 5-day erosive-abrasive protocol. Surface roughness and dentinal tubule occlusion (n=10) were assessed for both control and test hemifaces of the same sample along with permeability analysis (n=20). Two-way RM ANOVA and Tukey's post-hoc test were performed (p≤0.05). RESULTS: NaF and SnF2 presented higher roughness than WF. The number of open tubules was higher in WF. Permeability was higher in SnF2, but there was no significant difference between WF and NaF. CONCLUSIONS: both fluoride toothpastes occluded dentinal tubules and increased roughness. NaF toothpaste promoted greater decrease in dentin permeability.

A hipersensibilidade dentinária (HD) é caracterizada por dor rápida e aguda decorrente de túbulos dentais expostos. Objetivo: este estudo teve como objetivo avaliar a rugosidade, oclusão tubular e permeabilidade da dentina erodida escovada com diferentes dentifrícios. Materiais e Método: noventa dentes bovinos foram seccionados em blocos. Trinta hemifaces foram protegidas com verniz e outras sessenta foram submetidas à permeabilidade. Os espécimes foram divididos em grupos de acordo com os dentifrícios: sem flúor (SF), fluoreto de sódio (NaF) e fluoreto estanoso (SnF2). Em seguida, os blocos foram submetidos a um protocolo erosivo-abrasivo de 5 dias. A rugosidade da superfície e a oclusão do túbulo dentinário (n = 10) foram avaliadas para ambas as hemifaces de controle e teste da mesma amostra, também realizou-se a análise de permeabilidade (n = 20). Two-way RM ANOVA e pós-teste de Tukey foram realizados (p≤0,05). Resultados: NaF e SnF2 apresentaram rugosidade superior ao SF. O número de túbulos abertos foi maior em SF. Não encontramos diferenças significativas entre SF e NaF em relação à permeabilidade; entretanto, SnF2 apresentou maior permeabilidade. Conclusão: ambos os dentifrícios fluoretados foram capazes de ocluir os túbulos dentinários e aumentar a rugosidade. No entanto, o dentifrício NaF promoveu uma maior diminuição da permeabilidade dentinária.

Obliteration of Dentinal Tubules by Desensitizing Agents Based on Silver Fluoride/Potassium Iodide or Pre-Reacted Glass Particles: An in Vitro Study

Abstract Objective: To evaluate the efficacy of desensitizing agents for the obliteration of dentinal tubules subjected or not to a simulated oral environment. Material and Methods: Dentinal discs (n=8) treated with Riva-Star (RS) or PRG-Barrier-Coat (PRG) were submitted (cycled) or not submitted (control) to erosive-abrasive-thermal cycles and evaluated using scanning electron microscopy/energy dispersive spectroscopic analysis. The variables analyzed were tubule obliteration and dentin surface chemical composition. Data were analyzed by non-parametric tests (p<0.05). Results: The cycled and control groups did not differ significantly for the responses in each material. The PRG control and cycled groups had fewer visible tubules and a higher proportion of totally obliterated tubules than the RS groups. The percentages of silver coverage were higher in the RS-control than in the RS-cycled. There was a significant inverse correlation between the presence of silver and non-obliterated tubules (R=-0.791; p<0.001). The percentages of carbon, aluminum, strontium, and potassium were significantly higher in the PRG-control and PRG-cycled compared to the RS control. The percentages of calcium, phosphorus, and silver were significantly higher in the RS compared to the PRG groups. PRG-control showed a higher percentage of boron than RS-control. Conclusion: PRG promoted greater tubule obliteration than SR. Simulated stress did not affect the obliterating effect of each agent. Greater silver coverage corresponded to a lower proportion of non-obliterated tubules in RS. Carbon, aluminum, strontium, boron, and potassium predominated in the dentin surface treated with PRG, while calcium, phosphorus, and silver prevailed in RS groups (AU).

Barniz polimerizable de vidrio ionómero modificado con resina "clinpro xt": una alternativa de tratamiento para la sensibilidad dentaria. Revisión sistemática de la literatura

Resumen Introducción: En respuesta a la sensibilidad dentinaria, se han desarrollado múltiples productos, entre ellos, Clinpro XT, barniz de vidrio ionómero modificado con resina fotopolimerizable con flúor, calcio y fosfato. Metodología: Se realizó una revisión sistemática de la literatura. La selección fue en base a título, resumen y texto completo de acuerdo a los criterios de inclusión y exclusión. Resultados: De 299 artículos, fueron seleccionados revisiones sistemáticas, metaanálisis, estudios in vivo e in vitro y 2 encuestas. Discusión: Clinpro XT reduce la permeabilidad dentinaria, ocluye túbulos dentinarios e inhibe su reapertura, aumenta la biodisponibilidad de minerales en saliva y promueve la remineralización del esmalte. Significando una mayor protección del esmalte y dentina de forma inmediata y a largo plazo. Conclusiones: Clinpro XT demostró disminuir la hipersensibilidad dentinaria incluso después 6 meses posterior a su aplicación.

Resumo Introdução: Em resposta à sensibilidade dentinária, foram desenvolvidos múltiplos produtos, incluindo Clinpro XT, um verniz de vidro de ionómero modificado com resina fotopolimerizável com flúor, cálcio, e fosfato. Metodologia: Foi realizada uma revisão sistemática da literatura. A selecção foi baseada no título, resumo e texto completo de acordo com os critérios de inclusão e exclusão. Resultados: De 299 artigos, revisões sistemáticas, meta-análises, estudos in vivo e in vitro e 2 inquéritos foram seleccionados. Discussão: Clinpro XT reduz a permeabilidade da dentina, oclui os túbulos dentinários e inibe a sua reabertura, aumenta a biodisponibilidade dos minerais na saliva e promove a remineralização do esmalte. O que significa uma maior protecção do esmalte e da dentina imediatamente e a longo prazo. Conclusões: Foi demonstrado que o Clinpro XT diminui a hipersensibilidade da dentina mesmo 6 meses após a aplicação.

Abstract Introduction: Multiple products have been developed to treat dentin sensitivity, including Clinpro XT, a lightcuring resinmodified ionomer glass varnish with fluoride, calcium, and phosphate. Methodology: A systematic literature review was conducted. The articles were selected based on title, abstract, and full text according to the inclusion and exclusion criteria. Results: Of 299 articles, systematic reviews, metaanalysis, in vivo and in vitro studies, and 2 surveys were selected. Discussion Clinpro XT reduces dentin permeability, occludes dentin tubules, inhibits their reopening, increases mineral bioavailability in saliva, and promotes enamel remineralization. This entails greater protection of enamel and dentin immediately and in the long term. Conclusions: Clinpro XT was shown to decrease dentin hypersensitivity even six months after application.

Bioactive toothpastes in dentin hypersensitivity treatment: A systematic review.

The use of bioactive materials is a recent proposal in the treatment of dentin hypersensitivity (DH) due to the ability to stimulate the neoformation of a barrier on dentin surface. Questions have arisen about the effectiveness of the materials to reduce DH when compared to the control groups (placebo or non-bioactive substance). Thus, the aim of this systematic review was to evaluate the randomized controlled trials in adult patients for DH treatment with a dentifrice containing bioactive glass, applied either at-home or in-office. Methods: The study was registered in PROSPERO and followed PRISMA guidelines. Searches were carried out in four databases (Pubmed/Medline, CENTRAL, Wbb of Science, LILACS) spanning from February 2020 to March 2020, with no language or publication date restrictions. A supplementary hand-search was performed by checking the list of references. The so-called gray literature of the national and international databases for theses and dissertations, as well as unfinished, in progress and unpublished studies were also searched. Results: After reading the titles and abstracts, articles that were duplicated (74 records) or unrelated to the systematic review (76 records) were excluded. Fifteen studies were evaluated considering seven at low risk of bias, four at high risk and four at moderate risk. Conclusion: The bioactive compounds at low concentrations (2.5-7.5%) can be used as treatment of DH both at-home and in-office.