Effect of simulated CO2 and GaAlAs laser surface decontamination on temperature changes in Ti-plasma sprayed dental implants
✍ Scribed by Dr. Matthias Kreisler; Haitham Al Haj; Hermann Götz; Prof. Dr. Heinz Duschner; Prof. Dr. Bernd d'Hoedt
- Publisher
- John Wiley and Sons
- Year
- 2002
- Tongue
- English
- Weight
- 328 KB
- Volume
- 30
- Category
- Article
- ISSN
- 0196-8092
No coin nor oath required. For personal study only.
✦ Synopsis
Abstract
Background and Objective
To investigate and compare temperature elevations at the implant‐bone interface during simulated implant surface decontamination with a CO~2~ and a GaAlAs laser.
Study Design/Materials and Methods
Stepped cylinder implants (Frialit 2^®^ Friadent GmbH, Mannheim, Germany) with a Titanium plasma sprayed surface were inserted into bone blocks cut from pig femurs. An artificial periimplant bone defect provided access for laser irradiation in the coronal third. Both lasers were operated at 1.0–2.5 W in the cw‐mode. The bone block was placed into a 37°C water bath in order to simulate in vivo thermal conductivity and diffusitivity of heat. K‐type thermocouples connected to a digital meter were used to register temperature changes at the periimplant bone.
Results
In mean, the critical threshold of 47°C was exceeded after 8 seconds at a power output of 2.5 W, 13 seconds at 2.0 W, 18 seconds at 1.5 W, and 42 seconds at 1.0 W with the GaAlAs laser and 15 seconds (2.5 W), 23 seconds (2.0 W), 35 seconds (1.5 W), and 56 seconds (1.0 W) with the CO~2~ laser. At equal energy fluence, GaAlAs laser irradiation induced significantly higher temperature elevations than CO~2~ laser irradiation.
Conclusions
In an energy dependent manner implant surface decontamination with both laser types must be limited in time to allow the implant and bone to cool down. Clinical guidelines are presented to avoid tissue damage. Lasers Surg. Med. 30:233‐239, 2002. © 2002 Wiley‐Liss, Inc.