BACKGROUND Human dentin is a highly calcified tissue of mesenchymal origin with a heterogeneous structure. Its morphology is constantly remodelled throughout the life span of the tooth, as well as under the influence of external stimuli. OBJECTIVE The aim of the present study was to obtain information about the thermal changes in the crown and root dentin specimens of vital and devitalized teeth. METHODS The investigated samples were divided into 6 groups, depending on the patients' age and dentin location (crown, root). An additional group of endodontically treated teeth was created. The methods of choice were were combined thermal analysis (DTA-TG(DTG)-MS and gas chromatography-mass spectrometry. RESULTS After heating up to 1200 °C, endo- and exothermal effects were observed. The effects' dynamic was the same for all samples. The differences were in the samples' weight after the experiment, with root dentin showing the greatest mass loss percentage. CONCLUSIONS The observed mass loss differences could be attributed to the presence of impurities in the dentin, as well as alterations in the collagen matrix. Ageing and endodontic treatment could catalyse the accumulation of such changes and affect the microstructure of the mineralized tissue.

中文翻译：

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老化和牙髓治疗对人牙本质热稳定性的影响。

背景技术人牙本质是具有异质结构的间充质来源的高度钙化的组织。在牙齿的整个寿命期间以及在外部刺激的影响下，其形态都会不断重塑。目的本研究的目的是获得有关活力和失活牙齿的冠和牙本质牙本质样品中热变化的信息。方法根据患者的年龄和牙本质位置（冠状，根部）将研究样本分为6组。创建了另一组牙髓治疗牙齿。选择的方法是热分析（DTA-TG（DTG）-MS）和气相色谱-质谱联用，结果加热到1200℃后，观察到内热效应和放热效应，动态影响相同。所有样本。实验后样品的重量有所不同，根部牙本质显示出最大的质量损失百分比。结论观察到的质量损失差异可能归因于牙本质中杂质的存在以及胶原蛋白基质的改变。老化和牙髓治疗可能会促进这种变化的积累并影响矿化组织的微观结构。