Ahmed Omran Alhareb , Hazizan Md Akil , Zainal Arifin Ahmad
{"title":"添加丁腈橡胶/陶瓷填料提高PMMA义齿基托的冲击强度、断裂韧性和硬度","authors":"Ahmed Omran Alhareb , Hazizan Md Akil , Zainal Arifin Ahmad","doi":"10.1016/j.sjdr.2016.04.004","DOIUrl":null,"url":null,"abstract":"<div><h3>Background/purpose</h3><p>PMMA resin mostly used the fabrication of denture base by heat-curing technique. It has poor strength, including low impact strength and low fatigue resistance. In this work the combination of nitrile butadiene rubber (NBR) with two types of ceramic fillers (Al<sub>2</sub>O<sub>3</sub> and YSZ, respectively) on the mechanical properties of denture base are investigated.</p></div><div><h3>Materials and methods</h3><p>The denture base composites were fabricated by incorporating PMMA powder, 0.5<!--> <!-->wt% of benzoyl peroxide (BPO), fixed at 7.5<!--> <!-->wt% NBR particles and ceramic fillers (fixed at 5<!--> <!-->wt%) as powder components. In total, 180 specimens were prepared for all tests and divided into 6 groups for each test (<em>N</em> <!-->=<!--> <!-->10) coded G1–G6. Group 1 as the control group (without fillers) was mixed between PMMA powder and BPO; whereas the other five groups (G2–G6) were reinforced with NBR particles and different concentrations of ceramic fillers. The morphology of the fracture surface of specimens was examined by Field Emission Scanning Electron Microscopy (FESEM).</p></div><div><h3>Results</h3><p>Statistical analysis, shows that the mean impact strength (IS) and fracture toughness (<em>K</em><sub>IC</sub>) of control dentures when compared to reinforced PMMA at 7.5% NBR and 2.5% Al<sub>2</sub>O<sub>3</sub>/2.5% YSZ improved significantly (5.27<!--> <!-->±<!--> <!-->0.21–10.25<!--> <!-->±<!--> <!-->0.41<!--> <!-->kJ/m<sup>2</sup> and 1.60<!--> <!-->±<!--> <!-->0.24–2.58<!--> <!-->±<!--> <!-->0.30<!--> <!-->MPa·m<sup>1/2</sup>, respectively).</p></div><div><h3>Conclusion</h3><p>The reinforced PMMA denture bases are significantly different in IS and <em>K</em><sub>IC</sub> between study groups (<em>P</em> <!-->=<!--> <!-->0.001). However, the Vickers hardness (VH) is statistically not significantly different (<em>P</em> <!-->><!--> <!-->0.05).</p></div>","PeriodicalId":101249,"journal":{"name":"The Saudi Journal for Dental Research","volume":"8 1","pages":"Pages 26-34"},"PeriodicalIF":0.0000,"publicationDate":"2017-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/j.sjdr.2016.04.004","citationCount":"73","resultStr":"{\"title\":\"Impact strength, fracture toughness and hardness improvement of PMMA denture base through addition of nitrile rubber/ceramic fillers\",\"authors\":\"Ahmed Omran Alhareb , Hazizan Md Akil , Zainal Arifin Ahmad\",\"doi\":\"10.1016/j.sjdr.2016.04.004\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<div><h3>Background/purpose</h3><p>PMMA resin mostly used the fabrication of denture base by heat-curing technique. It has poor strength, including low impact strength and low fatigue resistance. In this work the combination of nitrile butadiene rubber (NBR) with two types of ceramic fillers (Al<sub>2</sub>O<sub>3</sub> and YSZ, respectively) on the mechanical properties of denture base are investigated.</p></div><div><h3>Materials and methods</h3><p>The denture base composites were fabricated by incorporating PMMA powder, 0.5<!--> <!-->wt% of benzoyl peroxide (BPO), fixed at 7.5<!--> <!-->wt% NBR particles and ceramic fillers (fixed at 5<!--> <!-->wt%) as powder components. In total, 180 specimens were prepared for all tests and divided into 6 groups for each test (<em>N</em> <!-->=<!--> <!-->10) coded G1–G6. Group 1 as the control group (without fillers) was mixed between PMMA powder and BPO; whereas the other five groups (G2–G6) were reinforced with NBR particles and different concentrations of ceramic fillers. The morphology of the fracture surface of specimens was examined by Field Emission Scanning Electron Microscopy (FESEM).</p></div><div><h3>Results</h3><p>Statistical analysis, shows that the mean impact strength (IS) and fracture toughness (<em>K</em><sub>IC</sub>) of control dentures when compared to reinforced PMMA at 7.5% NBR and 2.5% Al<sub>2</sub>O<sub>3</sub>/2.5% YSZ improved significantly (5.27<!--> <!-->±<!--> <!-->0.21–10.25<!--> <!-->±<!--> <!-->0.41<!--> <!-->kJ/m<sup>2</sup> and 1.60<!--> <!-->±<!--> <!-->0.24–2.58<!--> <!-->±<!--> <!-->0.30<!--> <!-->MPa·m<sup>1/2</sup>, respectively).</p></div><div><h3>Conclusion</h3><p>The reinforced PMMA denture bases are significantly different in IS and <em>K</em><sub>IC</sub> between study groups (<em>P</em> <!-->=<!--> <!-->0.001). However, the Vickers hardness (VH) is statistically not significantly different (<em>P</em> <!-->><!--> <!-->0.05).</p></div>\",\"PeriodicalId\":101249,\"journal\":{\"name\":\"The Saudi Journal for Dental Research\",\"volume\":\"8 1\",\"pages\":\"Pages 26-34\"},\"PeriodicalIF\":0.0000,\"publicationDate\":\"2017-01-01\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"https://sci-hub-pdf.com/10.1016/j.sjdr.2016.04.004\",\"citationCount\":\"73\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"The Saudi Journal for Dental Research\",\"FirstCategoryId\":\"1085\",\"ListUrlMain\":\"https://www.sciencedirect.com/science/article/pii/S2352003516300041\",\"RegionNum\":0,\"RegionCategory\":null,\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"\",\"JCRName\":\"\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"The Saudi Journal for Dental Research","FirstCategoryId":"1085","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S2352003516300041","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
Impact strength, fracture toughness and hardness improvement of PMMA denture base through addition of nitrile rubber/ceramic fillers
Background/purpose
PMMA resin mostly used the fabrication of denture base by heat-curing technique. It has poor strength, including low impact strength and low fatigue resistance. In this work the combination of nitrile butadiene rubber (NBR) with two types of ceramic fillers (Al2O3 and YSZ, respectively) on the mechanical properties of denture base are investigated.
Materials and methods
The denture base composites were fabricated by incorporating PMMA powder, 0.5 wt% of benzoyl peroxide (BPO), fixed at 7.5 wt% NBR particles and ceramic fillers (fixed at 5 wt%) as powder components. In total, 180 specimens were prepared for all tests and divided into 6 groups for each test (N = 10) coded G1–G6. Group 1 as the control group (without fillers) was mixed between PMMA powder and BPO; whereas the other five groups (G2–G6) were reinforced with NBR particles and different concentrations of ceramic fillers. The morphology of the fracture surface of specimens was examined by Field Emission Scanning Electron Microscopy (FESEM).
Results
Statistical analysis, shows that the mean impact strength (IS) and fracture toughness (KIC) of control dentures when compared to reinforced PMMA at 7.5% NBR and 2.5% Al2O3/2.5% YSZ improved significantly (5.27 ± 0.21–10.25 ± 0.41 kJ/m2 and 1.60 ± 0.24–2.58 ± 0.30 MPa·m1/2, respectively).
Conclusion
The reinforced PMMA denture bases are significantly different in IS and KIC between study groups (P = 0.001). However, the Vickers hardness (VH) is statistically not significantly different (P > 0.05).
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