Wyniki wyszukiwania - BazTech

1

The assessment of temperature amplitude arising during the implant bed formation in relation to variable preparation parameters – in vitro study

Kosior Piotr, Nikodem Anna, Kozuń Marta, Dudek Krzysztof, Janeczek M., Dobrzyński Maciej

Acta of Bioengineering and Biomechanics

|

2021

|

Vol. 23, no. 3

163--173

EN

The main purpose of this study was to analyse the temperatures generated during the bone bed preparation, given the internal structure of the bone bed, the geometry of the hole, and the treatment parameters such as the type of cooling and the rotational speed of the drill. The investigated material was domestic pig ribs, in which holes were drilled three times using two drill bit systems used for Hiossen® and Paltop® dental implantation. The ThermaCAM® P640 thermal imaging camera was used for measurement of drilling temperatures. After the holes were drilled, each rib was examined using the 1172 SkyScan microtomograph, Bruker®, to compare the geometry of the machined holes. The presented study proved that larger diameter drill bits (Hiossen® drill bits) generate more heat during the machining process, as evidenced by higher temperatures obtained for the Hiossen system in each case. It was proved that rotational speed, drill bit diameter and cooling system have a significant effect on the amount of heat generated during bone tissue preparation. The density and type of bone tissue in which the hole is prepared are significant factors affecting the amount of heat generated.

2

Improvement of drawability and fabrication possibility of dental implant screw made of pure titanium

Yoshida K., Saiki Y., Ohkubo Ch.

Hutnik, Wiadomości Hutnicze

|

2011

|

Vol. 78, nr 1

153-156

EN

We examined the effects of processing conditions on drawability, and the radius thickness ratio of drawn wire diameter to die bore diameter. Then, we examined the fabrication possibility of biocompatible dental implant screws made of pure titanium in the context of being allergy free, which were fabricated by wire drawing, heading and form rolling. We also examined the practicality of the dental implant screw made of pure titanium.

PL

W pracy określono wpływ warunków procesu na podatność tytanu na ciągnienie i współczynnik grubości promienia ciągnionego drutu do średnicy kalibrującej ciągadła. Następnie określono możliwości wytwarzania wkrętów na implanty dentystyczne, wykonanych z czystego tytanu, które nie powodowałyby alergii. Wkręty te wytwarzane są na drodze ciągnienia, spęczania i kształtowania na rolkach. Określono także praktyczność wkrętów na implanty dentystyczne wykonanych z czystego tytanu.

3

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

EN

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.

4

Hydroxyapatite coated dental implants by sputtering technique

Ozeki K., Fukui Y., Aoki H.

Biocybernetics and Biomedical Engineering

|

2006

|

Vol. 26, no. 1

95-101

EN

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.