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1.
Oper Dent ; 45(5): 484-495, 2020 Sep 01.
Article in English | MEDLINE | ID: mdl-32101496

ABSTRACT

CLINICAL RELEVANCE: Conventional multistep resin cements presented higher adhesive performance to dentin than simplified self-adhesive cements, which is an important criterion for indirect restoration prognosis. SUMMARY: This study aimed to conduct a systematic review of the literature on laboratory studies assessing bonding performance to dentin of conventional and self-adhesive resin cements, in cementing indirect restorations. This review was reported according to the PRISMA Statement. Of a total of 518 studies, 36 were screened full text and reviewed according to exclusion criteria. Nineteen papers were included in the systematic review and meta-analyses, according to the following inclusion criteria: studies that evaluated the bond strength to dentin of indirect restorations cemented with dual conventional or self-adhesive resin cements and those that presented bond strength data in MPa as an outcome. Statistical analyses were conducted using Rev-Man 5.1. Comparisons were performed with random effects models at 5% significance level. A global analysis comparing conventional and self-adhesive cements and three subgroup analyses comparing immediate and long-term results were performed. Global analysis showed a difference between groups, with conventional resin cements presenting higher bond strength results than self-adhesive resin cements, in immediate and long-term time periods (both p=0.03). Immediate and longterm bond strength results were different for self-adhesive cements, favoring immediate bond strength (p=0.03), but immediate and long-term bond strength results for conventional resin cements were not different (p=0.06). Medium or high risk of bias was found in all studies. Conventional multistep resin cements showed superior overall adhesive performance compared with simplified self-adhesive resin cements when used to cement indirect restorations to dentin.


Subject(s)
Dental Bonding , Resin Cements , Dental Cements , Dental Stress Analysis , Dentin , Dentin-Bonding Agents , Materials Testing , Tensile Strength
2.
Oper Dent ; 42(2): 165-174, 2017.
Article in English | MEDLINE | ID: mdl-27802121

ABSTRACT

The purpose of this study was to evaluate the ability of three resin composite systems to mask a severely discolored background by the application of a layering technique through CIELAB and CIEDE2000 analysis. Ninety 1.5-mm-thick disc specimens were produced from three different resin composite restoration systems: IPS Empress Direct (Ivoclar Vivadent), Charisma Diamond (Heraeus Kulzer), and Filtek Z350 XT (3M-ESPE). The specimens were divided into groups according to the restoration system and the resin composite shade combination used for the layering technique (enamel, body, and dentin shades). Color measurements were performed by a reflectance spectrophotometer (SP60, EX-Rite) against a C4 shade background and an inherent color background, which simulates a severely discolored background and a tooth surface with no discoloration, respectively. The total color difference between both color measurements was calculated by CIELAB (ΔE*ab) and CIEDE2000 (ΔE00) formulas. The mean ΔEab* and ΔE00 values were analyzed by analysis of variance (general linear models) and Tukey's post hoc tests (α=0.05). Three groups presented clinically acceptable color difference values (ΔE*≦3.46 and ΔE00≦2.25): 1.5 mm dentin, 1.0 mm dentin/0.5 mm body, and 1.0 mm dentin/0.5 mm enamel; ie, all the groups from the Z350 XT restoration system. The resin composite layering technique is an effective way to mask severely discolored backgrounds. The Filtek Z350 XT system was the only restoration system capable of masking the C4 background.


Subject(s)
Aluminum Silicates/chemistry , Composite Resins/chemistry , Dental Porcelain/chemistry , Esthetics, Dental , Tooth Discoloration/therapy , Colorimetry/methods , Light , Materials Testing , Spectrophotometry
3.
Arq. bras. med. vet. zootec ; 67(6): 1475-1482, nov.-dez. 2015. tab, graf
Article in English | LILACS | ID: lil-768134

ABSTRACT

This study aimed to evaluate the influence of the track surface on which horses are examined, regarding the phase of lameness presentation. Ten horses with lameness in at least one limb were evaluated with wireless inertial sensors on three track surfaces (concrete, loose sand and grass). Six crossover track sequences were established. The variables vector sum, maximum and minimum height of the head and pelvis, variation coefficient of the maximum and minimum height of the head and pelvis were analyzed using ANOVA, followed by Tukey test to compare means between track surface and sequence, at 5% significance level. The lameness phase (impact or pushoff) was analyzed considering the proportion of affected animals. There were no differences on vector sum, maximum and minimum height or variation coefficient of head and pelvis. Difference was observed on the number of strides registered on sand compared to grass and concrete (p <0.0001) for fore and hindlimbs. Impact lameness on forelimbs was presented by a larger number of animals on the concrete surface; pushoff lameness was more evident on the grass surface. In the hindlimbs, impact lameness was more evident on the grass surface, while pushoff lameness was in greater number of animals on concrete surfaces. The track sequence on which horses were trotted during evaluation does not seem to be a factor, but the number of lame horses and the phase of lameness manifestation can vary between track surfaces, as some horses showed impact lameness on soft ground and elevation lameness on hard ground.


Este estudo teve como objetivo avaliar a influência do tipo de superfície em que os cavalos são examinados em relação à fase de apresentação da claudicação. Dez cavalos com claudicação em pelo menos um dos membros foram avaliados com sensores inerciais sem fio em três tipos de superfície (concreto, areia e grama). Seis sequências de cruzamento de tipo de superfície foram estabelecidas. As variáveis soma vetorial, altura máxima e mínima da cabeça e da pélvis, o coeficiente de variação da altura máxima e mínima da cabeça e da pélvis foram analisadas utilizando uma Análise de Variância, seguida do teste de Tukey para comparação das médias entre tipos de superfície e sequências, a um nível de significância de 5%. A fase da claudicação (impacto ou elevação) foi analisada considerando a proporção de animais afetados. Não houve diferença na soma vetorial, altura máxima ou mínima e coeficiente de variação da altura máxima e mínima da cabeça e pélvis. Foi observada diferença no número de passos registrados na areia em comparação com grama e concreto (p <0,0001) para membros torácicos e pélvicos. Claudicação de impacto nos membros torácicos foi apresentada em um número maior de animais na superfície de concreto, já claudicação de elevação foi mais evidente na superfície de grama. Em membros pélvicos, a claudicação de impacto foi mais evidente na superfície de grama, enquanto claudicação de elevação esteve em maior número de animais na superfície de concreto. A sequência de superfícies em que os cavalos foram troteados durante a avaliação não foi um fator importante na manifestação da claudicação, mas o número de cavalos claudicantes e a fase de manifestação da claudicação podem variar entre as superfícies, visto que alguns cavalos mostraram claudicação de impacto em solo macio e claudicação de elevação em solo duro.


Subject(s)
Animals , Horses/anatomy & histology , Horses/injuries , Lameness, Animal/diagnosis , Locomotion , Sandy Soils
4.
Arq. bras. med. vet. zootec ; 60(4): 806-814, ago. 2008. graf, tab
Article in Portuguese | LILACS | ID: lil-489820

ABSTRACT

Um modelo experimental de sinovite em pôneis foi usado para avaliar o efeito do parecoxib, um antiinflamatório não-esteroidal (AINE) seletivo injetável. Cinco dias após indução da sinovite, três pôneis foram tratados com 0,55mg/kg/dia (IV) de parecoxib e três receberam solução salina 0,9 por cento (IV) por cinco dias. A avaliação de parâmetros clínicos dos animais e físico-químicos do líquido sinovial foi realizada antes da indução de sinovite, antes e 12, 24, 48, 72, 96 e 120 horas após o início do tratamento. A injeção intra-articular com adjuvante completo de Freund induziu sinovite de intensidade moderada a grave. Os pôneis tratados com parecoxib apresentaram diminuição do grau de claudicação; manutenção da flexão articular, do comprimento do passo, da temperatura retal e da freqüência cardíaca; e atenuação do grau de efusão articular. Embora o parecoxib, na dose utilizada, não tenha apresentado efeito sobre os parâmetros do líquido sinovial das articulações com sinovite, sua ação antipirética, antiinflamatória e principalmente analgésica foi observada.


An experimental synovitis model was used in ponies to evaluate the effect of parecoxib, a selective non steroidal anti-inflammatory drug (NSAID). Five days after synovitis induction, three ponies received parecoxib (IV) 0.55mg/kg/day and three ponies received sterile 0.9 percent saline solution (IV) for five days. Clinical parameters and synovial fluid were evaluated before synovitis induction, prior treatment and 12, 24, 48, 96, and 120 hours after the first treatment. The intra-articular injection of Freund's complete adjuvant induced a moderate to severe synovitis. The parecoxib treated ponies showed lameness reduction; maintenance of stride length, articular flexion, temperature, and heart rate; and attenuation of articular effusion. Although the used dosage of parecoxib had no effect on evaluated synovial fluid parameters, antipyretic, anti-inflammatory, and especially analgesic effects were observed.


Subject(s)
Animals , Anti-Inflammatory Agents, Non-Steroidal , Equidae , Synovitis/veterinary
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