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In vitro comparison of the marginal adaptation of cold ceramic sealer with the single-cone obturation technique versus AH-26 sealer with the lateral compaction technique in single-canal teeth.
BMC Oral Health
January 2025
Department of Endodontics, School of Dentistry, Shahid Sadoughi University of Medical Sciences, Yazd, Iran.
Objectives: This study aimed to compare the marginal adaptation of a cold ceramic (CC) sealer with the single-cone obturation technique with that of an AH-26 sealer with the lateral compaction technique in single-canal teeth.
Materials And Methods: In this in vitro experimental study, the root canals of 24 extracted single-rooted single-canal teeth were instrumented to F3 files by the crown-down technique and randomly assigned to 2 groups (n = 12). The root canals were obturated with a CC sealer and single-cone obturation technique with 4% gutta-percha in group 1 and with an AH-26 sealer and lateral compaction technique with 2% gutta-percha in group 2.
Anionic modulation induces molecular polarity in a three-component crown ether system.
Dalton Trans
January 2025
School of Chemistry and Chemical Engineering, Nanchang University, Nanchang, 330031, People's Republic of China.
Three-component crown ether phase change materials are characterized by a structural phase change in response to external stimuli such as temperature and electric or magnetic fields, resulting in significant changes in physical properties. In this work, we designed and synthesized two novel host-guest crown ether molecules [(PTFMA)(15-crown-5)ClO] (1) and [(PTFMA)(15-crown-5)PF] (2), through the reaction of -trifluoromethylaniline (PTFMA) with 15-crown-5 in perchloric acid or hexafluorophosphoric acid aqueous solution. Compound 1 undergoes a structural change from the non-centrosymmetric space group (2) to the centrosymmetric space group (2/) with increasing temperature.
View Article and Find Full Text PDFInfluence of heat-assisted vat photopolymerization on the physical and mechanical characteristics of dental 3D printing resins.
Sci Rep
January 2025
Department of Prosthodontics, Yonsei University College of Dentistry, Yonsei-ro 50-1, Seodaemun-gu, Seoul, 03722, Republic of Korea.
The effects of heat-assisted vat photopolymerization (HVPP) on the physical and mechanical properties of 3D-printed dental resins, including the morphometric stability of 3D-printed crowns, were investigated. A resin tank was designed to maintain the resin at 30, 40, and 50 ℃ during the 3D printing process. Test specimens were fabricated using a commercial dental resin, with untreated resin serving as the control group.
View Article and Find Full Text PDFImpact of thermal exposure on deciduous teeth: A comparative analysis with permanent teeth.
Forensic Sci Int
December 2024
The Department of Oral Biology, The Maurice and Gabriela Goldschleger School of Dental Medicine, Faculty of Medical and Health Sciences, Tel Aviv University, Tel Aviv 69978, Israel; The Shmunis Family Anthropology Institute, Dan David Center for Human Evolution and Biohistory Research, Faculty of Medical and Health Sciences, Tel Aviv University, Tel Aviv 69978, Israel. Electronic address:
Children are particularly vulnerable to fatalities from fire incidents, and the crucial role of dentition in the identification processes is well known. Despite this, research on burned deciduous teeth is lacking, often assuming similarities with burned permanent teeth, disregarding their morphological and chemical distinctions. This goal of this study was to investigate the effect of burning on deciduous teeth, focusing on post-burning tooth color assessment.
View Article and Find Full Text PDFFracture resistance and behavior of endodontically treated maxillary premolars with varying ferrule heights and post numbers: A laboratory study.
J Prosthodont
January 2025
Department of Restorative Dental Science, College of Dentistry, University of Ha'il, Ha'il, Saudi Arabia.
Purpose: To investigate how varying ferrule heights and the number of glass fiber posts affect fracture resistance and behavior of endodontically treated maxillary first premolars with substantial loss of tooth structure.
Materials And Methods: Twenty-four extracted endodontically treated human maxillary first premolars were divided into three groups (n = 8) based on ferrule height and post number. The groups were as follows: premolars of 2 mm ferrule height that were restored with single posts (control group), premolars of 0.
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