Heat generation caused by ablation of restorative materials with an ultrashort pulse laser (USPL) system |
| |
Authors: | Andreas Braun Richard Johannes Wehry Olivier Brede Claudia Dehn Matthias Frentzen Florian Schelle |
| |
Institution: | (1) Department of Operative and Preventive Dentistry, University of Bonn, Welschnonnenstrasse. 17, 53111 Bonn, Germany |
| |
Abstract: | Heat generation during the removal of dental restorative materials may lead to a temperature increase and cause painful sensations
or damage dental tissues. The aim of this study was to assess heat generation in dental restoration materials following laser
ablation using an ultrashort pulse laser (USPL) system. A total of 225 specimens of phosphate cement (PC), ceramic (CE), and
composite (C) were used, evaluating a thickness of 1 to 5 mm each. Ablation was performed with an Nd:YVO4 laser at 1,064 nm, a pulse length of 8 ps, and a repetition rate of 500 kHz with a power of 6 W. Employing a scanner system,
rectangular cavities of 1.5-mm edge length were generated. A temperature sensor was placed at the back of the specimens to
record the temperature during the ablation process. All measurements were made employing a heat-conductive paste without any
additional cooling or spray. Heat generation during laser ablation depended on the thickness of the restoration material (p < 0.05) with the highest values in the composite group (p < 0.05), showing an increase of up to 17 K. A time delay for temperature increase during the ablation process depending on
the material thickness was observed in the PC and C group (p < 0.05) with highest values for cement (p < 0.05). Employing the USPL system for removal of restorative materials, heat generation has to be considered. Especially
during laser ablation next to pulpal tissues, painful sensations might occur. |
| |
Keywords: | |
本文献已被 PubMed SpringerLink 等数据库收录! |
|