Wyniki wyszukiwania - BazTech

Ograniczanie wyników

2 Biocybernetics and Biomedical Engineering

Znaleziono wyników: 2

Liczba wyników na stronie

Wyniki wyszukiwania

Sortuj według:

Ogranicz wyniki do:

Evaluation of bone stress distribution around thinly hydroxyapatite coated dental implant using finite element analysis

Ozeki K., Fukunaga K., Yaguchi T., Funakubo A., Asaoka T., Fukui Y., Aoki H.

Biocybernetics and Biomedical Engineering

2007

Vol. 27, no. 1-2

89-94

Dental implants were coated with hydroxyapatite (HA) by the sputtering technique. The influences of the HA film thickness on the bone stress distribution was investigated using the three-dimensional finite element analysis. In this analysis, force of 100 N axial load was applied on the non-coated, thickly HA coated, and thinly HA coated titanium implants The maximum equivalent bone stresses were 21.5, 8.55 and 6.33 MPa for the non-coated, thickly HA coated, and thinly HA coated cylinder type implants, respectively. The bone stress of the screw type implants was 29.0, 9.20 and 9.03 MPa, respectively. The maximum bone stress of the thinly HA coated implant was lower than in the other implants. Eight types of the implant shape for the thinly HA coated implant were also designed, and the tiered neck type implant showed the lowest maximum bone stress in all the types.

Hydroxyapatite coated dental implants by sputtering technique

Ozeki K., Fukui Y., Aoki H.

Biocybernetics and Biomedical Engineering

2006

Vol. 26, no. 1

95-101

Hydroxyapatite (HA) was coated onto titanium substrates using radio frequency sputtering, and the coated HA films were crystallized in autocIave at 110°C using the low temperature hydtrothermal method. In pull-out tests, the adhesion strength of the sputtered film to the substrate increased from 1.9 : 0.2 to 5.3 : 1.6 MPa after the hydrothermal treatment. Sputtered films subjected to the hydrothermal treatment and plasma-sprayed coating on titanium columns were implanted in the diaphysis of the femora of six adult dogs, and pull-out tests were carried out after two, four, and 12 weeks. The sputtered film showed a higher bone bonding strength than the plasma-sprayed coating at the same periods. The coated implants were also placed into mandibles for 2,4, 12 and 24 weeks for histological examination. In the histological examination, connective tissue was noted after 2 and 4 weeks around the controls, whereas, in the sputter-coated implant, new bone formation was noted after 2 and 4 weeks, without any connective tissue.