Amonkar Ankita Dilip, Dhaded Neha Sunil, Doddwad Preeti Kore, Patil Anand C, Hugar Shivayogi M, Bhandi Shilpa, Raj A Thirumal, Patil Shankargouda, Zanza Alessio, Testarelli Luca
Consultant Endodontist, Goa, India. Email:
Department of Conservative Dentistry and Endodontics, KAHER's V.K. Institute of Dental Sciences, Belagavi, India.
Acta Stomatol Croat. 2021 Sep;55(3):291-301. doi: 10.15644/asc55/3/6.
The aim of this research was to evaluate the effect of long-term use of three intracanal medicaments on the radicular dentin microhardness and fracture resistance.
A chemomechanical preparation was done using the Protaper rotary instruments up to F3. The teeth were stored in an incubator at 37°C at 100% humidity and were categorized in three groups by random allocation, namely: Triple Antibiotic Paste (TAP), Calcium hydroxide paste (Apexcal) and Ledermix. Following medicament application, the access openings of all teeth were sealed with 4 mm thickness of cavit. The samples were stored for periods of 1 week, 1 month and 3months. Two dentin cylinders measuring 5mm and 3mm were obtained from each sample. The cervical third was used for fracture resistance and the middle third was used for micro hardness evaluation. The microhardness testing was done using a Knoop microhardness tester, and the fracture resistance testing was done using the universal testing machine.
Calcium hydroxide showed maximally negative effect on the physical properties of radicular dentin compared to TAP (p= 0.0100 at one month and Ledermix (p=0.0001 at one month). With an increase in the application time, there was an increased deterioration in the physical properties of radicular dentin.
Long-term placement of calcium hydroxide, Triple Antibiotic Paste, and Ledermix (p= 0.0001at 3 months) significantly affects the microhardness and fracture resistance of radicular dentin.
本研究旨在评估长期使用三种根管内药物对根管牙本质显微硬度和抗折性的影响。
使用Protaper旋转器械进行化学机械预备至F3。将牙齿置于37°C、湿度100%的培养箱中保存，并随机分为三组，即：三联抗生素糊剂（TAP）、氢氧化钙糊剂（Apexcal）和Ledermix。药物应用后，所有牙齿的髓腔开口用4mm厚的暂封材料封闭。样本分别保存1周、1个月和3个月。从每个样本中获取两个直径分别为5mm和3mm的牙本质圆柱体。颈部三分之一用于抗折性测试，中部三分之一用于显微硬度评估。使用努氏显微硬度测试仪进行显微硬度测试，使用万能试验机进行抗折性测试。
与TAP相比，氢氧化钙对根管牙本质物理性能的负面影响最大（1个月时p = 0.0100），与Ledermix相比也是如此（1个月时p = 0.0001）。随着应用时间的增加，根管牙本质的物理性能恶化加剧。
长期放置氢氧化钙、三联抗生素糊剂和Ledermix（3个月时p = 0.0001）会显著影响根管牙本质的显微硬度和抗折性。
_291-301-f1.jpg)
_291-301-f2.jpg)