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RISS 인기검색어
- 검색키워드
- 주제어 : Vicker's microhardness (검색결과 2 건)
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정지아,문주훈,고영곤 대한치과보존학회 2001 Restorative Dentistry & Endodontics Vol.26 No.6
The purpose of this study was to compare the mechanical properties of three condensable composite resins and one hybrid composite resin. The compressive strength, diametral tensile strength, Vicker's microhardness were tested for mechanical properties of condensable composite resins (SureFil, Ariston pHc, Synergy compact), and hybrid composite resin (Z 100). The tested materials were divided into four groups : control group - Z 100 (3M Co, USA), experimental group I- Ariston pHc, (Vivadent, Co., Liechtenstein) , experimental group II - SureFil (Dentsply, Co., U.S.A.) , experimental group III- Synergy Compact (Coltene, Co., Swiss) . According to the above classification, we made samples of SureFil, Ariston pHc, Synergy Compact, Z 100 with separable cylindrical metal mold. And then, we measured and compared the value of compressive strength, diametral tensile strength and Vicker's microhardness of each sample. The results were as follows : 1. In compressive strength, control group (Z 100) revealed the highest value (398.85±19.61MPa), and followed by SureFil (381.65±31.24MPa), Synergy compact (354.85±12.22MPa), Ariston pHc (308.60±36.88MPa). There were no significant differences between SureFil group and Z 100 group, whereas there were significant differences between SureFil group and Ariston pHc group (P<0.05) . 2. In diametral tensile strength, Synergy compact revealed the highest value (86.54±3.44MPa) and followed by SureFil (84.54±3.53MPa), Z100 (76.91±1.63MPa), Ariston pHc(60.34±6.95MPa). There were no significant differences between SureFil group and Synergy compact group 3. In microhardness, control group (Z 100)revealed the highest value (223.7 ±58.0Hv), and followed by SureFil (117.5±10.2Hv), Ariston pHc (116.2±11.9Hv), Synergy Compact (101.9±10.8Hv). There were no significant differences between Ariston pHc group and Synergy compact group Key words : Condensable composite resin, Compressive strength Diametral tensile strength, Vicker's microhardness
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김길수,윤태호,송광엽,안승근,Kim, Kil-Soo,Yoon, Tae-Ho,Song, Kwang-Yeob,Ahn, Seung-Geun 대한치과보철학회 2007 대한치과보철학회지 Vol.45 No.1
Statement of problem: The esthetic component of dental care has become increasingly more important, while new tooth-colored materials are continually marketed. Various new indirect composite materials have been developed with required advantages. The most recent development in the indirect composites has been the introduction of the second-generation laboratory composite or poly-glass materials. They are processed by different laboratory techniques based on combinations of heat, pressure, vacuum and light polymerization. Although, second generation products became available in 1995, their characteristics and clinical performance have not been adequately investigated. Purpose: The aim of this study was to measure the mechanical properties of the second generation indirect resin system and compare these with an existing universal direct composite resin. Material and method: In this study four indirect composite material (Adoro LC, BelleGlass HP, Tescera, Synfony) were tested for flexural strength, wear resistance, hardness and their degree of conversion against Z250, a light cure direct composite. Results: Within the limitations of this study, the following conclusions were drawn: 1. From the abrasion wear result, Adoro showed the least volume loss while Synfony showed the greatest volume loss. Z250 and BelleGlass HP didn't show significant difference (p>0.05), but they showed significant difference with other groups (p<0.05). From the attrition wear, BelleGlass HP showed the least volume loss and it didn’t show significant difference with Tescera (p>0.05). While Synfony showed the greatest volume loss that it showed significant difference with other groups (p>0.05). 2. Mean values of flexural strength by means of three point bending test was in the order of Z250, Adoro, Belleglass HP, Tescera and Synfony. Mean elastic modulus was in the order of Z250, BelleGlass HP, Tescera, Adoro and Synfony. 3. The result of Vicker‘s microhardness value showed that significantly higher value in Z250 (p<0.05), and is in the order of BelleGlass HP, Tescera, Adoro and Synfony. 4. The degree of conversion measured by FT-IR showed significantly higher value in BelleGlass HP (p<0.05), and is in the order of Adoro, Synfony, Tescera and Z250. Conclusion: Significant differences were found in the flexural strength, wear resistance, hardness and their degree of conversion.
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