Stability of external and internal implant connections after a fatigue test.

OBJECTIVE: The objective of this study was to compare the torque and detorque values of screw intermediates of external hexagon, internal hexagon, and Morse taper implants in single restorations before and after mechanical cycling. MATERIALS AND METHODS: The study sample was divided into three groups (n = 10) as follows: group EH - external hexagon implant, group IH - internal hexagon implant, and group MT - Morse taper implant. Universal abutments were screwed on the implants, and metal crowns were cemented onto the abutment. The samples were submitted to a mechanical testing of 1 million cycles, with a frequency of 8 cycles per second under a 400 N load. The application and registration of the screw torque (T0) and detorque (T1) values of the intermediate were performed before and after the test. The results were statistically evaluated by analysis of variance (ANOVA) and Tukey's test (α = 0.05). RESULTS: There was no difference between the values of T0 and T1 in the intra-group samples. However, the inter-group difference in T0 between the EH (12.8 N cm) and MT (18.6 N cm) groups and in T1 between the EH (10.4 N cm) and IH (13.8 N cm), EH and MT (19.4 N cm), and MT and IH (P = 0.001) groups were significant. The MT group showed a lower variation of T0 and T1. CONCLUSION: The internal implants, particularly MT, showed better stability in these cases when used for single restorations.

Reabilitação estética indireta utilizando o sistema In-Ceram Zircônia - relato de caso clínico / Rehabilitation aesthetic indirect using In-Ceram Zirconium - report of clinical case

As porcelanas odontológicas foram desenvolvidas no intuito de atender a demanda por materiais mais estéticos e resistentes. Buscou-se através do caso clínico apresentar o tratamento reabilitador de um tipo de sistema cerâmico, o In-Ceram-Zircônia, enfatizando suas indicações, vantagens e limitações. Constatou-se que as cerâmicas reforçadas com o óxido de Zircônio possuem propriedades estéticas e adequada adaptação marginal. Sendo mais resistentes que quaisquer outras próteses livres de metal disponíveis no mercado devido a sua grande resistência à flexão, podendo substituir as restaurações metalo-cerâmicas, respeitando as poucas limitações do sistema.

The dental porcelains were developed in the intention of assisting the demand for more aesthetic materials (metal free) and resistant. It was searched through a clinical case present the treatment of a type of forward ceramic system, In-Ceram, emphasizing its indications, advantages and limitations. It marginal adaptation. Being more resistant than any other metal free prostheses available in the market due to its great resistance to the flexing, being able to substitute the metal ceramic restoration, respecting the few limitations of the system.