TY  - JOUR
AU  - Zelic, Ksenija
AU  - Milovanović, Petar
AU  - Rakočević, Zlatko Lj.
AU  - Aškrabić, Sonja
AU  - Potočnik, Jelena
AU  - Popovic, Miroslav
AU  - Đurić, Marija
PY  - 2014
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/5962
AB  - Objective. Increased tooth fragility after devitalization is commonly observed but there is no definite mechanistic explanation for such phenomenon. Therefore, it is important to analyze more profoundly structural and compositional properties of this altered form of dentin. The present study investigates the differences between normal and devitalized dentin using advanced techniques. Methods. Atomic force microscopic imaging (AFM), energy dispersive X-ray analysis (EDX) and micro-Raman spectroscopy were performed on 16 dentin specimens, eight vital and eight that underwent root-canal treatment at least two years before extraction and had no infection in root canals before or after devitalization. Results. The mean size of mineral crystals showed by AFM was larger in devitalized than in healthy dentin in the same age category. AFM phase shifts in devitalized cases revealed altered mechanical characteristics and suggested differences in composition of material between devitalized teeth and healthy controls. No significant difference in Ca/P ratio between vital and devitalized teeth was found using EDX. However, micro-Raman analyses showed that in devitalized teeth, apart from hydroxyapatite, dentin contained significant amounts of apatite phases with lower calcium content: octacalcium phosphate, dicalcium phosphate dihydrate and tricalcium phosphate. Significance. Differences between vital and devitalized dentin bring new insights into the basis of devitalized tooth fragility. Larger mineral crystals could account for decreased mechanical strength in devitalized teeth. Moreover, calcium-phosphate phases with lower Ca content have lower material strength, and the presence of these phases in devitalized teeth may explain their increased fragility. (C) 2014 Academy of Dental Materials. Published by Elsevier Ltd. All rights reserved.
T2  - Dental Materials
T1  - Nano-structural and compositional basis of devitalized tooth fragility
VL  - 30
IS  - 5
SP  - 476
EP  - 486
DO  - 10.1016/j.dental.2014.01.014
ER  - 

@article{
author = "Zelic, Ksenija and Milovanović, Petar and Rakočević, Zlatko Lj. and Aškrabić, Sonja and Potočnik, Jelena and Popovic, Miroslav and Đurić, Marija",
year = "2014",
abstract = "Objective. Increased tooth fragility after devitalization is commonly observed but there is no definite mechanistic explanation for such phenomenon. Therefore, it is important to analyze more profoundly structural and compositional properties of this altered form of dentin. The present study investigates the differences between normal and devitalized dentin using advanced techniques. Methods. Atomic force microscopic imaging (AFM), energy dispersive X-ray analysis (EDX) and micro-Raman spectroscopy were performed on 16 dentin specimens, eight vital and eight that underwent root-canal treatment at least two years before extraction and had no infection in root canals before or after devitalization. Results. The mean size of mineral crystals showed by AFM was larger in devitalized than in healthy dentin in the same age category. AFM phase shifts in devitalized cases revealed altered mechanical characteristics and suggested differences in composition of material between devitalized teeth and healthy controls. No significant difference in Ca/P ratio between vital and devitalized teeth was found using EDX. However, micro-Raman analyses showed that in devitalized teeth, apart from hydroxyapatite, dentin contained significant amounts of apatite phases with lower calcium content: octacalcium phosphate, dicalcium phosphate dihydrate and tricalcium phosphate. Significance. Differences between vital and devitalized dentin bring new insights into the basis of devitalized tooth fragility. Larger mineral crystals could account for decreased mechanical strength in devitalized teeth. Moreover, calcium-phosphate phases with lower Ca content have lower material strength, and the presence of these phases in devitalized teeth may explain their increased fragility. (C) 2014 Academy of Dental Materials. Published by Elsevier Ltd. All rights reserved.",
journal = "Dental Materials",
title = "Nano-structural and compositional basis of devitalized tooth fragility",
volume = "30",
number = "5",
pages = "476-486",
doi = "10.1016/j.dental.2014.01.014"
}

Zelic, K., Milovanović, P., Rakočević, Z. Lj., Aškrabić, S., Potočnik, J., Popovic, M.,& Đurić, M.. (2014). Nano-structural and compositional basis of devitalized tooth fragility. in Dental Materials, 30(5), 476-486.
https://doi.org/10.1016/j.dental.2014.01.014

Zelic K, Milovanović P, Rakočević ZL, Aškrabić S, Potočnik J, Popovic M, Đurić M. Nano-structural and compositional basis of devitalized tooth fragility. in Dental Materials. 2014;30(5):476-486.
doi:10.1016/j.dental.2014.01.014 .

Zelic, Ksenija, Milovanović, Petar, Rakočević, Zlatko Lj., Aškrabić, Sonja, Potočnik, Jelena, Popovic, Miroslav, Đurić, Marija, "Nano-structural and compositional basis of devitalized tooth fragility" in Dental Materials, 30, no. 5 (2014):476-486,
https://doi.org/10.1016/j.dental.2014.01.014 . .