Comparative study between laser and conventional techniques for class V cavity preparation in gamma-irradiated teeth (in vitro study)
Autor: | Amr H. M. Rasmy, Dalia El Rouby, Eman Mohamed Fathy El Maghraby, Rami M. Ghali, Tarek Abdel-Hamid Harhash |
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Rok vydání: | 2017 |
Předmět: |
Materials science
Gamma ray Group ii Laser Dentistry Dental Caries law.invention 03 medical and health sciences 0302 clinical medicine stomatognathic system law Humans In vitro study Irradiation General Dentistry Dental Leakage Bond strength business.industry Significant difference 030206 dentistry Buccal administration lcsh:RK1-715 stomatognathic diseases Gamma Rays lcsh:Dentistry 030220 oncology & carcinogenesis Original Article Dental Cavity Preparation business |
Zdroj: | Journal of Applied Oral Science, Vol 25, Iss 6, Pp 657-665 Journal of Applied Oral Science Journal of Applied Oral Science, Volume: 25, Issue: 6, Pages: 657-665, Published: DEC 2017 Journal of Applied Oral Science v.25 n.6 2017 Journal of applied oral science Universidade de São Paulo (USP) instacron:USP |
ISSN: | 1678-7765 1678-7757 |
Popis: | Objective: The purpose of this study was to compare laser with conventional techniques in class V cavity preparation in gamma-irradiated teeth. Methods: Forty extracted human teeth with no carious lesions were used for this study and were divided into two main groups: Group I (n = 20) was not subjected to gamma radiation (control) and Group II (n=20) was subjected to gamma radiation of 60 Gray. Standard class V preparation was performed in buccal and lingual sides of each tooth in both groups. Buccal surfaces were prepared by the Er,Cr:YSGG laser (Waterlase iPlus) 2780 nm, using the gold handpiece with MZ10 Tip in non-contact and the “H” mode, following parameters of cavity preparation – power 6 W, frequency 50 Hz, 90% water and 70% air, then shifting to surface treatment laser parameters – power 4.5 W, frequency 50 Hz, 80% water and 50% air. Lingual surfaces were prepared by the conventional high-speed turbine using round diamond bur. Teeth were then sectioned mesio-distally, resulting in 80 specimens: 40 of which were buccal laser-treated (20 control and 20 gamma-irradiated specimens) and 40 were lingual conventional high-speed bur specimens (20 control and 20 gamma-irradiated specimens). Results: Microleakage analysis revealed higher scores in both gamma groups compared with control groups. Chi-square test revealed no significant difference between both control groups and gamma groups (p=1, 0.819, respectively). A significant difference was revealed between all 4 groups (p=0.00018). Conclusion: Both laser and conventional high-speed turbine bur show good bond strength in control (non-gamma) group, while microleakage is evident in gamma group, indicating that gamma radiation had a dramatic negative effect on the bond strength in both laser and bur-treated teeth. |
Databáze: | OpenAIRE |
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