The residual monomer content and mechanical properties of CAD\CAM resins used in the fabrication of complete dentures as compared to heat cured resins
Identifieur interne : 000027 ( Main/Exploration ); précédent : 000026; suivant : 000028The residual monomer content and mechanical properties of CAD\CAM resins used in the fabrication of complete dentures as compared to heat cured resins
Auteurs : Al-Dharrab AymanSource :
- Electronic Physician [ 2008-5842 ] ; 2017.
Abstract
The utilization of computer-assisted designing and computer-assisted milling CAD\CAM resins in the fabrication of removable prostheses is a modern-day concept that offers many advantages over the use of the traditional polymethylmethacrylate (PMMA).
This study instigated some of the mechanical properties of CAD\CAM denture base resin including the amount of residual monomer.
This study was conducted at the Faculty of Dentistry, King Abdulaziz University from October 2016 to February 2017. A total of seventy rectangular specimens were fabricated (group A: 35 heat-cured PMMA and group B: 35 CAD/CAM pre-polymerized acrylic resin blocks). The flexural strength and surface hardness were tested while the residual monomer content at baseline, two-day and seven-day intervals was estimated using gas chromatography (GC). Means and standard deviations were determined for each group as well as independent-samples t-test and ANOVA with repeated measures for comparison between the groups and subgroups of varying time intervals.
Heat cured PMMA (A), displayed higher flexural strength and low value flexural modulus compared to CAD/CAM acrylic resin denture base material (B). Student t-test indicated highly significant differences (p<0.001) of the flexural strength (t=37.911) and flexural modulus (t=88.559). The surface hardness of group (B) was significantly higher compared to group (A) as indicated by the t-test (t=20.430). Higher release of the monomer content was detected by GC in group (A) at different time intervals with a statistically significant difference (p<0.001) in residual monomer content.
CAD/CAM resin may be considered suitable for use in the construction of denture bases.
Url:
DOI: 10.19082/4766
PubMed: 28894533
PubMed Central: 5586991
Affiliations:
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A total of seventy rectangular specimens were fabricated (group A: 35 heat-cured PMMA and group B: 35 CAD/CAM pre-polymerized acrylic resin blocks). The flexural strength and surface hardness were tested while the residual monomer content at baseline, two-day and seven-day intervals was estimated using gas chromatography (GC). Means and standard deviations were determined for each group as well as independent-samples t-test and ANOVA with repeated measures for comparison between the groups and subgroups of varying time intervals.</p></sec><sec><title>Results</title><p>Heat cured PMMA (A), displayed higher flexural strength and low value flexural modulus compared to CAD/CAM acrylic resin denture base material (B). Student t-test indicated highly significant differences (p<0.001) of the flexural strength (t=37.911) and flexural modulus (t=88.559). The surface hardness of group (B) was significantly higher compared to group (A) as indicated by the t-test (t=20.430). Higher release of the monomer content was detected by GC in group (A) at different time intervals with a statistically significant difference (p<0.001) in residual monomer content.</p></sec><sec><title>Conclusion</title><p>CAD/CAM resin may be considered suitable for use in the construction of denture bases.</p></sec></div></front><back><div1 type="bibliography"><listBibl><biblStruct><analytic><author><name sortKey="Ucar, Y" uniqKey="Ucar Y">Y Ucar</name></author><author><name sortKey="Akova, T" uniqKey="Akova T">T Akova</name></author><author><name sortKey="Aysan, I" uniqKey="Aysan I">I Aysan</name></author></analytic></biblStruct><biblStruct><analytic><author><name sortKey="Awad, Ak" uniqKey="Awad A">AK Awad</name></author><author><name sortKey="Jassim, Rk" uniqKey="Jassim R">RK Jassim</name></author></analytic></biblStruct><biblStruct><analytic><author><name sortKey="Baba, Nz" uniqKey="Baba N">NZ Baba</name></author></analytic></biblStruct><biblStruct><analytic><author><name 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