Objective assessment of simulated non-carious cervical lesion by tridimensional digital scanning - An in vitro study.

OBJECTIVE: Clinical assessment of progression of non-carious cervical lesions (NCCLs) is currently based on subjective methods. We hypothesize that 3D digital intraoral scanners (IOS) can provide quantitative outcomes for objective measuring and monitoring of NCCLs. This in vitro study verified the reliability of IOS to monitor dental structure loss of simulated NCCLs, in comparison to a reference bench-top 3D optical profilometer (BTS). METHODS: NCCLs of different severity levels (early, moderate, or severe, n = 150) were simulated in a preceding study. Impressions of the lesions were taken and scanned with both BTS (ProScan; Scantron) and IOS (TRIOS4; 3Shape). Generated 3D images were analyzed for volumetric tooth loss (mm3) by superimposition followed by subtraction analysis. ProForm (Scantron) and WearCompare (Leeds Digital Dentistry) software were used in association to BTS and IOS, respectively. Agreement was assessed using intraclass correlation coefficient (ICC, alpha=0.05) and Bland-Altman plots. RESULTS: ICC (confidence interval at 95 %) between IOS and BTS for all data combined was 0.962 (0.942-0.973), showing excellent reliability. Subset analyses showed that NCCLs with lower volume loss (early- and moderate-stage lesions) resulted in moderate ICCs, whereas severe lesions showed excellent ICC. Bland-Altman plots demonstrated general good agreement, with narrower limits for early stage-lesions. CONCLUSION: IOS data demonstrated good agreement to BTS, when measuring tooth structure loss in simulated NCCLs, with particularly higher ICC in more severe lesions. Considering the accessibility and ease-of-use, IOS showed to be a good alternative for the objective assessment of NCCLs in vitro. CLINICAL SIGNIFICANCE: 3D intraoral scanners' accessibility and objectivity make them potentially valuable tools for assessing and monitoring NCCLs.

Novel resin-based material containing ß-tricalcium phosphate nanoparticles for the reduction of dentin permeability.

OBJECTIVES: To synthesize and characterize a novel dentin adhesive containing Beta-Tricalcium Phosphate (ß-TCP) nanoparticles and test its ability to reduce dentin permeability (dP). METHODS: Experimental adhesives were prepared by mixing Bis-GMA, TEGDMA, HEMA (50/25/25 wt.%), photo-initiators, and inhibitors. The following groups were tested: Experimental adhesives without ß-TCP (Exp.); with 10 wt.% ß-TCP (Exp.10 wt.% ß-TCP); with 15 wt.% ß-TCP (Exp.15 wt.% ß-TCP), Scotchbond Multi-Purpose (SBMP) and Clearfil SE Protect Bond (CFPB). Degree of conversion (DC%, 10 and 20 s); Flexural Strength (FS), Knoop Hardness (KHN), and Cell Viability (OD%) tests were performed. dP was evaluated by hydraulic conductance, using human dentin disks (n=12), at three-time intervals: post-EDTA (T0); post-treatment (T1); and post-erosion/abrasion cycling (T2). Data were statistically analyzed (α=0.05). RESULTS: For all groups, exposure time for 20 s presented a higher DC% than for 10 s. For FS, filled adhesives did not differ from unfilled and from CFPB. Experimental adhesives did not differ among them and showed lower KHN than the commercial products. Cell viability did not differ among adhesives, except Exp. 15 wt.%, which showed lower OD% than Exp., Exp. 10% and, CFPB. For dP, only Exp.10 and 15 wt.% ß-TCP did not present difference between the times T1 and T2. After cycling, Exp.10 wt.% ß-TCP presented lower permeability than Exp. and CFPB. CONCLUSIONS: The incorporation of 10 wt.% ß-TCP nanoparticles into the resin-based dental material did not affect its mechanical properties and biocompatibility, and promoted the greatest reduction in dentin permeability, sustaining this effect under erosive/abrasive challenges. CLINICAL SIGNIFICANCE: A novel resin-based dental material containing ß-TCP nanoparticles was able to reduce dentin permeability, maintaining its efficacy after erosive/abrasive challenges. The synthesized material did not affect dental pulp cell viability and might be promising for other conditions that require dental remineralization, such as tooth wear and dental caries.

Análise do financiamento de pesquisas em Endodontia apresentadas nas reuniões anuais da Sociedade Brasileira de Pesquisa Odontológica: revisão bibliométrica / Análisis de financiamiento para investigaciones en Endodoncia presentado en las reuniones anuales de la Sociedad Brasileña de Investigaciones Dentales: revisión bibliométrica / Analysis of research funding in Endodontics presented at the annual meetings of the Brazilian Society of Dental Research: bibliometric review

O objetivo deste estudo foi realizar uma análise bibliométrica da produção científica em Endodontia apresentada nas reuniões anuais da Sociedade Brasileira de Pesquisa Odontológica (SBPqO), avaliando suas principais fontes de financiamento. Foi realizado um estudo observacional retrospectivo analisando os resumos publicados nos anais da SBPqO em um período de 10 anos (2011 a 2021), em todas as categorias. Para a coleta de dados foramutilizadas as palavras-chave "Endodontia", "canal radicular", "tratamento endodôntico", "forame apical" e "polpa dental". A extração dos dados foi realizada por dois avaliadores independentes, que identificaram 2534resumos. Com relação à distribuição de financiamento,foi possível observar que 33,93 % (n=860) dos estudos foram financiados. Dentre as agências de fomento que mais financiaram foram a Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (Capes) (n=211; 24,53%) e o Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq) (n=163; 18,95%), que são instituições de financiamento nacionais. Ao analisar a distribuição geográfica dos financiamentos observou-se que o Sudeste deteve 72,45% (n=270), sendo o estado de São Paulo o que mais recebeu incentivo (56,68%, n=211). Aregião Norte foi a que recebeu menor número de financiamentos. Na análise proporcional (quantidade de trabalhos financiados e presença de Programas de Pós-graduação em Odontologia por região), o Sudeste apresentou 3,87 financiamentos por programa . Durante a década avaliada, as pesquisas na área de Endodontia apresentadas na SBPqO aumentaram até 2018 e, em seguida, decresceram. A maioria das pesquisas se concentrou na área temática de materiais endodônticos (AU).

El objetivo de este estudio fue realizar un análisis bibliométrico de la producción científica en Endodoncia presentada en las reuniones anuales de la Sociedad Brasileña de Investigación Dental (SBPqO), evaluando sus principales fuentes de financiación. Se realizó un estudio observacional retrospectivo analizando los resúmenes publicados en los anales de la SBPqO durante un período de 10 años (2011 a 2021), en todas las categorías. Para la recolección de datos se utilizaron las palabras clave "Endodoncia", "endodoncia", "tratamiento endodóntico", "foramen apical" y "pulpa dental". La extracción de datos fue realizada por dos evaluadores independientes, que identificaron 2534 resúmenes. En cuanto a la distribución del financiamiento, se pudo observar que el 33,93% (n=860) de los estudios fueron financiados. Entre las entidades financiadoras que aportaron mayor financiamiento se encuentran la Coordinación de Perfeccionamiento del Personal de Educación Superior (CAPES) (n=211; 24,53%) y el Consejo Nacional de Desarrollo Científico y Tecnológico (CNPq) (n=163; 18, 95 %), que son instituciones financieras nacionales. Al analizar la distribución geográfica del financiamiento, se observó que el Sudeste poseía el 72,45%(n=207), siendo el estado de São Paulo el que recibió más incentivos (56,68%, n=211). La región Norte recibió el menor número de financiamiento. En el análisis proporcional (número de trabajos financiados y presencia de Programas de Postgrado en Odontología por región), el Sudeste presentó 3,87 financiamientos por programa. Durante la década evaluada, las investigaciones en el área de Endodoncia presentadas en la SBPqO aumentaron hasta 2018 y luego disminuyeron. La mayoría de las investigaciones se han centrado en el área temática de los materiales endodónticos (AU).

The aim of this study was to conduct a bibliometric analysis of the scientific production in Endodontics presented at the annual meetings of the Brazilian Society of Dental Research (SBPqO) evaluating its main sources of funding. A retrospective observational study was carried out analyzing abstracts published in the SBPqO proceedings in all categories, over a period of 10 years (2011 to 2021). For data collection, the keywords "Endodontics," "root canal," "endodontic treatment," "apical foramen," and "dental pulp" were used. Data extraction was performed by two independent reviewers who identified 2534 abstracts. Regarding the distribution of funding, it was observed that 33.93% (n=860) of the studies were funded. Among the funding agencies, the Coordination for the Improvement of Higher Education Personnel (Capes) (n=211; 24.53%) and the National Council for Scientific and Technological Development (CNPq) (n=163; 18.95%) were the ones that provided the mostfunding, both being national funding institutions. When analyzing the geographical distribution of funding, the Southeast region accounted for 72.45% (n=270), with the state of São Paulo receiving the most support (56.68%, n=211). The North region received the lowest amount of funding. In the proportional analysis (number of funded studies and the presence of Postgraduate Programs in Dentistry by region), the Southeast presented 3.87 fundings per program. throughout the evaluated decade, research in the field of Endodontics presented at SBPqO increased until 2018 and then decreased. Most of the research focused on the thematic area of endodontic materials (AU).

Influence of inorganic composition and filler particle morphology on the mechanical properties of self-adhesive resin cements.

Objectives: This study aimed to evaluate the influence of inorganic composition and filler particle morphology on the mechanical properties of different self-adhesive resin cements (SARCs). Materials and Methods: Three SARCs including RelyX Unicem-2 (RUN), Maxcem Elite (MAX), and Calibra Universal (CAL) were tested. Rectangular bar-shaped specimens were prepared for flexural strength (FS) and flexural modulus (FM) and determined by a 3-point bending test. The Knoop microhardness (KHN) and top/bottom microhardness ratio (%KHN) were conducted on the top and bottom faces of disc-shaped samples. Sorption (Wsp) and solubility (Wsl) were evaluated after 24 hours of water immersion. Filler morphology was analyzed by scanning electron microscopy and X-ray energy dispersive spectroscopy (EDS). FS, FM, %KHN, Wsp, Wsl, and EDS results were submitted to 1-way analysis of variance and Tukey's post-hoc test, and KHN also to paired t-test (α = 0.05). Results: SARC-CAL presented the highest FS value, and SARC-RUN presented the highest FM. SARC-MAX and RUN showed the lowest Wsp and Wsl values. KHN values decreased from top to bottom and the SARCs did not differ statistically. Also, all resin cements presented carbon, aluminum, and silica in their composition. SARC-MAX and RUN showed irregular and splintered particles while CAL presented small and regular size particles. Conclusions: A higher mechanical strength can be achieved by a reduced spread in grit size and the filler morphology can influence the KHN, as well as photoinitiators in the composition. Wsp and Wsl can be correlated with ions diffusion of inorganic particles.

TiO2 nanotubes improve physico-mechanical properties of glass ionomer cement.

OBJECTIVES: The aim of this study was to determine the physico-mechanical properties of a high viscosity glass ionomer cement (GIC) reinforced with TiO2 nanotubes (TiO2-nt). METHODS: TiO2-nt was incorporated into the GIC powder components (Ketac Molar EasyMix™) in concentrations of 0% (control group), 3%, 5%, 7% by weight. Compressive strength (n = 10/group), three point bending for flexural strength (n = 18/group), microshear bond strength to dentin and failure mode (n = 20/group), and surface roughness and weight loss before and after brushing simulation (30,000 cycles) (n = 8/group) were evaluated. Data were submitted to Shapiro-Wilk, ANOVA, Tukey and Chi-square tests (α ≤ 0.05). RESULTS: Addition of 5% of TiO2-nt into GIC presented the highest values for compressive strength and differed from the control, 3% and 7% groups (p = 0.023). There were no significant differences in flexural strength (p = 0.107) and surface roughness before and after the dental brushing (p = 0.287) among the groups. GIC added with 5% TiO2-nt showed the lowest weight loss values (p = 0.01), whereas the control, 3% or 5% TiO2-nt groups presented similar microshear bond strength values (p ≥ 0.05). The 5% TiO2-nt group featured higher microshear bond strength than the 7% TiO2-nt group (p = 0.034). Cohesive in material was the most representative failure mode for all groups. SIGNIFICANCE: The incorporation of TiO2-nt did not affect GIC's adhesiveness to dentin, but improved its compressive strength at 5%. Furthermore, TiO2-nt decreased the percentage of weight loss after GIC's surface wear.