ABSTRACT
OBJECTIVES: To compare the effectiveness of the topical administration of benzocaine and EMLA on oral pain and tactile sensitivity. MATERIALS AND METHODS: A randomized, double-blind, split-mouth clinical trial was carried out with 20 volunteers. The sensorial and quantitative tests were applied before the contact with topical anesthetic and after the application. RESULTS: In the superficial tactile perception test, when we compared each group singly, there were statistically significant values in the decrease of superficial tactile perception when compared to the moment prior to the application of anesthetic agents. For the sensitivity to mechanical pain, no statistical significant difference was observed at evaluated times. In the needle penetration test, in an intergroup analysis, we found a decrease in the pain sensitivity to needle penetration at 5 min (p=0.053) and at 10 min (p=0.019) after the contact of the anesthetic drug with the oral mucosa. CONCLUSION: The application of topical anesthetic drugs reduces the discomfort associated with this procedure, mainly until the first 10 minutes. Only the needle penetration sensitivity test showed sufficient sensitivity to reveal a difference in the anesthetic effect between EMLA and benzocaine. This trial is registered with RBR-2N2GSW.
ABSTRACT
Pilares angulados frente a fatores biomecânicos adversos, como assentamento não passivo, presença de fenda (gap) e sobrecarga oclusal, podem ter longevidade diminuída devido à falha de componentes, como afrouxamento, soltura e fratura de parafusos. Este trabalho teve como objetivo avaliar à resistência mecânica dos parafusos dos pilares angulados de 25º, com alturas de cinta de 2 mm e 4 mm, submetidos a carregamento axial compressivo, paralelo ao longo eixo do implante, nas plataformas protéticas hexagonais externas (HE) e internas (HI). Nessa análise, 40 implantes e 40 pilares tipo post ou munhão para prótese cimentada foram divididos em quatro grupos de dez: 1) hexágono externo e pilar angulado 25º com cinta de 2 mm (HE2); 2) hexágono externo e pilar angulado 25º com cinta de 4 mm (HE4); 3) hexágono interno e pilar angulado 25º com cinta de 2 mm (HI2); 4) hexágono interno e pilar angulado 25º com cinta de 4 mm (HI4). Cada amostra foi fixada em uma base de aço e levada a uma máquina de ensaios mecânicos para as provas compressivas. Os dados foram tabulados e submetidos à análise de variância Anova dois critérios, com nível de significância de 5%. No grupo HE2, o parafuso do pilar sofreu fratura quando a carga compressiva atingiu 112,21 kgf. No grupo HE4, 120,64 kgf. No grupo HI2, 175,96 kgf. No grupo HI4, 116,03 kgf. A associação do pilar angulado de 25° com cinta de 2 mm ao implante com hexágono interno foi a que apresentou melhor desempenho mecânico. As demais apresentaram resultados semelhantes.
Biomechanical adverse conditions, such as non-passive fit, presence of gaps, and occlusal overload can lead to decrease longevity of angulated abutments due to screw loosening/fracture. The aim of this work was to evaluate the mechanical strength of prosthetic abutments with 2mm and 4mm collar heights under axial compressive static loading over external (EH) and internal (IH) hexagon implant platforms. Forty implants and 40 25-degree angled abutments for cemented prostheses were divided into four groups of ten each as follows: 1) external hex with 2mm collar height (EH2), 2) external hex with 4mm collar height (EH4), 3) internal hex with 2mm collar height (IH2) and, 4) internal hex with 4mm collar height (IH4). Each sample was secured to a stainless steel base and loaded in a universal testing machine until failure. Data was submitted to 2-way ANOVA (5% significance level). Abutment screw fractures were seen for EH2, EH4, IH2, and IH4 at 112.21kgf, 120.64kfg, 175.96kgf, and 116.03kgf, respectively. The use a 25-degree abutment with 2mm collar height (IH2) presented the best mechanical results. Also, similar results were demonstrated for all other groups
