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Fracture Forces of Dentin after Surface Treatment with High Speed Drill Compared to Er:YAG and Er,Cr:YSGG Laser Irradiation


Affiliations
1 Department of Conservative Dentistry, Periodontology and Preventive Dentistry, RWTHAachen University Hospital, Pauwelsstrasse 30, 52074 Aachen, Germany
2 AALZ Aachen Dental Laser Center, Center for Biomedical Technology, RWTH Aachen Campus, Pauwelsstrasse 17, 52074 Aachen, Germany
3 Medical Material Science, RWTH Aachen University Hospital, Pauwelsstrasse 30, 52074 Aachen, Germany
4 Department of Conservative Dentistry, Periodontology and Preventive Dentistry, RWTHAachen University Hospital, Pauwelsstrasse 30, 52074 Aachen, Germany
 

Dental tooth restorative procedures may weaken the structural integrity of the tooth, with the possibility of leading to fracture. In this study we present findings of coronal dentin strength after different techniques of surface modification. The fracture strength of dentin beams after superficial material removal with a fine diamond bur high speed drill hand piece, Er:YAG (2.94 μm, 8 J/cm2), and Er,Cr:YSGG (2.78 μm, 7.8 J/cm2) laser irradiation slightly above the ablation threshold was measured by a four-point bending apparatus. Untreated dentin beams served as a control. A total of 58 dentin beams were manufactured from sterilized human extracted molars using the coronal part of the available dentin.Mean values of fracture strength were calculated as 82.0 ± 27.3MPa for the control group (𝑛 = 10), 104.5±26.3MPa for high speed drill treatment (𝑛 = 10), 96.1 &3177;28.1MPa for Er,Cr:YSGG laser irradiation (𝑛 = 20), and 89.1±36.3MPa for Er:YAG laser irradiation (𝑛 = 18). Independent Student's 𝑡-tests showed no significant difference between each two groups (𝑝 > 0.05).Within the parameter settings and the limits of the experimental setup used in this study, both lasers systems as well as the high speed drill do not significantly weaken coronal dentin after surface treatment.
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  • Fracture Forces of Dentin after Surface Treatment with High Speed Drill Compared to Er:YAG and Er,Cr:YSGG Laser Irradiation

Abstract Views: 138  |  PDF Views: 23

Authors

Rene Franzen
Department of Conservative Dentistry, Periodontology and Preventive Dentistry, RWTHAachen University Hospital, Pauwelsstrasse 30, 52074 Aachen, Germany
Nasrin Kianimanesh
AALZ Aachen Dental Laser Center, Center for Biomedical Technology, RWTH Aachen Campus, Pauwelsstrasse 17, 52074 Aachen, Germany
Rudolf Marx
Medical Material Science, RWTH Aachen University Hospital, Pauwelsstrasse 30, 52074 Aachen, Germany
Asma Ahmed
AALZ Aachen Dental Laser Center, Center for Biomedical Technology, RWTH Aachen Campus, Pauwelsstrasse 17, 52074 Aachen, Germany
Norbert Gutknecht
Department of Conservative Dentistry, Periodontology and Preventive Dentistry, RWTHAachen University Hospital, Pauwelsstrasse 30, 52074 Aachen, Germany

Abstract


Dental tooth restorative procedures may weaken the structural integrity of the tooth, with the possibility of leading to fracture. In this study we present findings of coronal dentin strength after different techniques of surface modification. The fracture strength of dentin beams after superficial material removal with a fine diamond bur high speed drill hand piece, Er:YAG (2.94 μm, 8 J/cm2), and Er,Cr:YSGG (2.78 μm, 7.8 J/cm2) laser irradiation slightly above the ablation threshold was measured by a four-point bending apparatus. Untreated dentin beams served as a control. A total of 58 dentin beams were manufactured from sterilized human extracted molars using the coronal part of the available dentin.Mean values of fracture strength were calculated as 82.0 ± 27.3MPa for the control group (𝑛 = 10), 104.5±26.3MPa for high speed drill treatment (𝑛 = 10), 96.1 &3177;28.1MPa for Er,Cr:YSGG laser irradiation (𝑛 = 20), and 89.1±36.3MPa for Er:YAG laser irradiation (𝑛 = 18). Independent Student's 𝑡-tests showed no significant difference between each two groups (𝑝 > 0.05).Within the parameter settings and the limits of the experimental setup used in this study, both lasers systems as well as the high speed drill do not significantly weaken coronal dentin after surface treatment.