Aguilar-Hernández Jeannette, Torres-Méndez Fernando, Méndez-González María-Verónica, Davila-Perez Claudia-Edith, Kolosovas-Machuca Eleazar-Samuel, Gutierrez-Sánchez Mariana
Master's student in endodontics, Endodontics Postgraduate Program, Faculty of Stomatology, Autonomous University of San Luis Potosí, San Luis Potosi, Mexico.
Researcher-Professor, Endodontics Postgraduate Program, Faculty of Stomatology, Autonomous University of San Luis Potosí, San Luis Potosi, Mexico.
J Clin Exp Dent. 2023 May 1;15(5):e382-e389. doi: 10.4317/jced.60095. eCollection 2023 May.
Gutta-percha (Gp) is an inert thermoplastic polymer used as a filling to replace the dental pulp space, which has been reformulated to improve its three-dimensional sealing properties. Therefore, this study aimed to analyze the physical, chemical and thermal properties of two types of gutta-percha filling. As well as measuring the temperature distribution along the cone at the time of cutting through an in-situ test.
Two commercially available brands of gutta-percha point were investigated: Conform Fit TM Gutta-Percha for ProTaper Gold® (PTG) (Dentsply Sirona), and Hygenic Gutta-Percha (Coltene whaledent). Differential scanning calorimetry (DSC) and thermogravimetric analysis (TGA) were selected for the thermal characterization of materials, and Fourier Transform Infrared Spectroscopy (FT-IR) for the chemical analysis of Gp cones. Regarding temperature distribution, it was evaluated using a thermographic camera (FLIR ONE® PRO by MicroUSB P/N 435-0011-01) at 0 to 20 s after the cutting process (n=11/group).
Both materials have three fusion endotherms associated with the three crystalline phases of Gp, with similar temperatures but enthalpies that differ by 60%, the fusion enthalpy being higher for Conform Fit. In the chemical characterization, elements such as Zn, C, O, Ba, S and Si were found in both materials but in different proportions. Regarding the content of fillers, the Conform Fit presented around 30% of Gp polymer and 25% for the Hygenic. The morphological characterization shows a microtexturized coating in the form of bars on a micrometric scale for the Conform Fit, which could favor a better three-dimensional seal. In addition to that, in heat transfer studies they showed greater temperature control.
The characterization of the materials allowed us to see the variation in terms of their composition and configuration to the Gp cones of two commercial brands. These variations directly modify the thermal behavior of the material. Gutta-percha, Conform Fit, Infrared thermography, Differential Scanning Calorimetry, Infrared Spectroscopy.
牙胶是一种惰性热塑性聚合物，用作填充材料以替代牙髓腔，其配方已进行改进以提高其三维密封性能。因此，本研究旨在分析两种牙胶充填材料的物理、化学和热性能。同时通过原位测试测量切割时沿牙胶尖的温度分布。
研究了两种市售品牌的牙胶尖：适用于ProTaper Gold®（PTG）的Conform Fit TM牙胶（登士柏西诺德）和卫生型牙胶（科天恩慧俪）。选择差示扫描量热法（DSC）和热重分析（TGA）对材料进行热特性表征，选择傅里叶变换红外光谱法（FT-IR）对牙胶尖进行化学分析。关于温度分布，在切割过程后0至20秒使用热成像相机（MicroUSB P/N 435-0011-01的FLIR ONE® PRO）进行评估（每组n = 11）。
两种材料都有与牙胶的三个晶相相关的三个熔融吸热峰，温度相似但焓相差60%，Conform Fit的熔融焓更高。在化学表征中，两种材料都发现了锌、碳、氧、钡、硫和硅等元素，但比例不同。关于填料含量，Conform Fit约含30%的牙胶聚合物，卫生型含25%。形态表征显示，Conform Fit在微米尺度上呈现出棒状微纹理涂层，这可能有利于更好的三维密封。此外，在传热研究中，它们表现出更好的温度控制。
材料表征使我们能够看到两个商业品牌牙胶尖在成分和结构方面的差异。这些差异直接改变了材料的热行为。牙胶、Conform Fit、红外热成像、差示扫描量热法、红外光谱法。
