This study examined the effect of thermal cycling on the microleakage of bonded amalgam restorations. Three dental amalgam alloys and a gallium alloy were tested with two adhesive resin systems and copal varnish as a control. Class V cavity preparations were prepared on 168 freshly extracted premolars or molars. The preparations were placed parallel to and 1.0 mm occlusal to the cementoenamel junction (CEJ). Four groups of 42 teeth each were treated with one of the following adhesive dentin systems: Bond-It, All-Bond 2/Resinomer or a copal varnish (Copalite). The four groups of 42 teeth each were then restored with one of three dental amalgams: Orosphere Plus, Indiloy, Oralloy or a Gallium alloy (Galloy), resulting in 12 test groups of 14 teeth each. The specimens were stored in double distilled water at 37 degrees C for 24 hours. Final contouring and polishing of the restorations were performed under water spray. Half of the restorations in each group were thermocycled for 3000 cycles (5 degrees C-37 degrees C-55 degrees C-37 degrees C) with a dwell time of 15 sec at each temperature. The other half were stored in double distilled water at 37 degrees C for 24 hours. Then all 168 restorations were stained with dye, sectioned and scored for microleakage. Results showed that the adhesive dentin systems reduced microleakage in amalgam restorations compared to copal varnish only in non-thermocycled specimens. Statistical analysis of the results showed that there was an extremely significant difference (p < 0.001) in microleakage between the non-thermocycled and the thermocycled specimens in all test groups, whereas, there was no significant difference (p > 0.05) among thermocycled specimens. The reduction of microleakage was not significantly different between Bond-It and All-Bond 2/Resinomer in non-thermocycled specimens. Oralloy showed the most microleakage in the non-thermocycled groups when compared to the other alloys using the same adhesive liner.
Download full-text PDF |
Source |
|---|
Publication Analysis
Top Keywords
Similar Publications
Objectives: To compare trends in teaching and placement of composite resin versus amalgam in posterior restorations in Canadian dental schools with those in the United States.
Methods: Secondary descriptive and statistical analyses were performed on data from 2 previous studies. The data consisted of responses to questionnaires on teaching policies and the proportion of posterior restorations (amalgam and composite resin) performed in Canadian and US dental schools.
Teaching posterior composite restorations: A survey of dental schools in Palestine.
Heliyon
October 2024
Faculty of Dentistry, Arab American University, Palestine.
Aim: This study aimed to assess different aspects of teaching posterior composite restorations in two dental schools in Palestine.
Materials And Methods: A questionnaire was emailed to the heads of the operative and conservative dentistry departments to collect detailed information on the teaching practices related to posterior composite restorations. The questionnaire comprised 22 questions structured to collect information on the time dedicated to teaching the topic, competency assessments, future plans for allocating time for each restoration type, relevant indications and contraindications, specific materials and techniques utilized in the application, and fees charged for posterior restorations.
Systematic review: oral and maxillofacial radiology as fundamental methods of virtual autopsy.
Forensic Sci Res
September 2023
Department of Oral and Maxillofacial Radiology-Forensic Odontology, Faculty of Dentistry, Universitas Padjadjaran, Bandung, Indonesia.
Article Synopsis
- Refusal of autopsy can happen for reasons like religious beliefs and concerns about diseases, prompting interest in alternative methods like virtual forensic odontological autopsy.
- The study systematically reviewed literature from December 2021 to October 2022 to assess the use of oral and maxillofacial radiology as a non-invasive technique for virtual autopsy.
- Four main imaging techniques were identified for virtual autopsy in forensic odontology, including CT scanning (multidetector CT), cone beam CT, and magnetic resonance imaging, each with unique benefits.
Effects of Finishing on Surface Roughness of Four Different Glass-Ionomer Cements and One Alkasite: In Vitro Investigation over Time Using Aging Simulation.
J Funct Biomater
October 2024
Division of Restorative Dentistry, Periodontology and Prosthodontics, Dental Medicine and Oral Health, Medical University of Graz, 8010 Graz, Austria.
Article Synopsis
- In 2017, Europe banned the use of amalgam fillings for children under 15 and pregnant/breastfeeding women, creating a demand for better alternative materials.
- This study tested the surface roughness of five different amalgam-replacement materials using six finishing techniques across three time points, involving 960 samples made from 3D-printed molds.
- Results showed that conventional and hybrid glass-ionomer cements had smoother surfaces than high-viscosity alternatives, with some materials demonstrating stable roughness over time, emphasizing the need for careful selection of finishing methods.
Evaluating the effect of amalgam fillings on caries detection in cone-beam computed tomography images.
Dent Res J (Isfahan)
September 2024
Department of Maxillofacial Surgery, Dental Implants Research Center, Dental Research Institute, School of Dentistry, Isfahan University of Medical Sciences, Isfahan, Iran.
Background: Dental caries stands as one of the most prevalent dental concerns, with early diagnosis being pivotal in clinical dentistry. Cone-beam computed tomography (CBCT) emerges as a widely utilized modality for dental caries identification, owing to its significant advantages. However, there remains a considerable knowledge gap regarding the efficacy of CBCT scans in detecting dental caries.
View Article and Find Full Text PDFWant AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!