Lukas Blumer1, Fredy Schmidli1, Roland Weiger2, Jens Fischer3. 1. Department of Dental Materials and Engineering, University Hospital of Dental Medicine, University of Basel, Basel, Switzerland. 2. Department of Periodontology, Endodontology and Cariology, University Hospital of Dental Medicine, University of Basel, Basel, Switzerland. 3. Department of Dental Materials and Engineering, University Hospital of Dental Medicine, University of Basel, Basel, Switzerland; VITA Zahnfabrik, Bad Säckingen, Germany. Electronic address: jens.fischer@unibas.ch.
Abstract
OBJECTIVE: The aim of the investigation was to contribute to the ongoing discussion at the international standardization committee on how to artificially age dental resin composite cements. METHODS: Indirect tensile strength (n=30) of a dual-cured resin composite cement (Panavia F2.0) was measured to evaluate the effect of water storage at 37°C or thermal cycling (5°C/55°C/1min) for up to 64 days. The influence of water temperature (5-65°C) after 16 days and the effect of 1 day water storage at 37°C prior to aging were assessed. Storage in air at 37°C served as control. RESULTS: Thermal cycling affected the indirect tensile strength most, followed by water storage at 55°C, whereas water storage at 37°C had only little influence. Major deterioration occurred before day 4 (≈6000 cycles). A 1-day pre-treatment by water storage at 37°C prior to thermal cycling attenuated the effect of aging. SIGNIFICANCE: For the material investigated, thermal cycling for 4 days is the most efficient aging procedure. A 1-day water storage at 37°C prior to thermal cycling is recommended to allow complete polymerization. A 4-day water storage at 55°C may be considered as a viable alternative to thermal cycling.
OBJECTIVE: The aim of the investigation was to contribute to the ongoing discussion at the international standardization committee on how to artificially age dental resin composite cements. METHODS: Indirect tensile strength (n=30) of a dual-cured resin composite cement (Panavia F2.0) was measured to evaluate the effect of water storage at 37°C or thermal cycling (5°C/55°C/1min) for up to 64 days. The influence of water temperature (5-65°C) after 16 days and the effect of 1 day water storage at 37°C prior to aging were assessed. Storage in air at 37°C served as control. RESULTS: Thermal cycling affected the indirect tensile strength most, followed by water storage at 55°C, whereas water storage at 37°C had only little influence. Major deterioration occurred before day 4 (≈6000 cycles). A 1-day pre-treatment by water storage at 37°C prior to thermal cycling attenuated the effect of aging. SIGNIFICANCE: For the material investigated, thermal cycling for 4 days is the most efficient aging procedure. A 1-day water storage at 37°C prior to thermal cycling is recommended to allow complete polymerization. A 4-day water storage at 55°C may be considered as a viable alternative to thermal cycling.
Authors: Antonio Straface; Lena Rupp; Aiste Gintaute; Jens Fischer; Nicola U Zitzmann; Nadja Rohr Journal: Head Face Med Date: 2019-08-08 Impact factor: 2.151
Authors: Mariana Dias Moda; Ticiane Cestari Fagundes; André Luiz Fraga Briso; Paulo Henrique Dos Santos Journal: PLoS One Date: 2018-11-26 Impact factor: 3.240