The Influences of Dehydration on the Mechanical Properties of Human Dentin

Minerals

Pedro Álvarez-Lloret¹  MohammadMusfiqur Rahman²  Asad-Uz-Zaman³  Mohiuddin Ahmed⁴  MohammadShafiqul Alam⁵  AbuFaem Mohammad Almas Chowdhury⁶  MDRefat Readul Islam⁶  Monica Yamauti⁶  Hidehiko Sano⁶  Arefin Alam⁶ 

[1] Department of Geology, Faculty of Geology, University of Oviedo, Jesús Arias de Velasco s/n, 33005 Oviedo, Spain;Department of Oral Anatomy and Physiology, Sapporo Dental College and Hospital, Plot 24, Sector 8, Dhaka 1230, Bangladesh;Department of Oral Pathology and Periodontology, Sapporo Dental College and Hospital, Plot 24, Sector 8, Dhaka 1230, Bangladesh;Department of Oral and Maxillofacial Surgery, Sapporo Dental College and Hospital, Plot 24, Sector 8, Dhaka 1230, Bangladesh;Department of Paediatric Dentistry, Shaheed Suhrawardy Medical College, Sher-E-Bangla Nagar, Dhaka 1207, Bangladesh;Department of Restorative Dentistry, Graduate School of Dental Medicine, Hokkaido University, Kita 13, Nishi 7, Kita-ku, Sapporo 060-8586, Japan;

关键词: dentin;    dehydration;    hardness;    elastic modulus;    correlation;    ultimate tensile strength;   

DOI  :  10.3390/min11040336

来源: DOAJ

【 摘 要 】

The complex, dynamic, and hydrated microstructures of human dentin serve as the major determinant for the restorative performance of biomaterials. This study aimed to evaluate the mechanical properties of human dentin under different hydration conditions. The occlusal dentin of five third molars was exposed and cut into 1 mm² dentin slabs. The slabs were then polished and further cut into 1 mm² dentin beams and stored in distilled water. Two beams/tooth were used for testing their hardness (H) and elastic modulus (E) at 5 min (baseline), 1 h, and 24 h after dehydration (23 °C and 30% RH), and also for measuring weight at following dehydration times: 0 min, 5 min, 1 h, and 24 h. Five additional molars were employed to prepare 0.4 mm² dentin beams (3/tooth) for determining ultimate tensile strength (UTS) at 5 min (baseline), 1 h, and 24 h post-dehydration. Statistical significance was set at α = 0.05. Dehydration time significantly affected H, E, weight-loss, and UTS of dentin (p < 0.05). H and E values showed a strongly positive and significant correlation (r > 0.5, p < 0.05). Dehydration can substantially modify the mechanical properties of dentin, leading to misinterpretation of restorative outcomes in vitro.

【 授权许可】

Unknown