Improvement in its durability and surface deterioration of dental restorative materials due to surface-contact fatigue

提高牙科修复材料的耐用性和表面接触疲劳引起的表面劣化

• 批准号: 19592252
• 负责人: FUJII Kouichi
• 金额: $ 3.24万
• 依托单位: Kagoshima University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 2007
• 资助国家: 日本
• 起止时间: 2007 至 2009
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-19592252/
• 关键词: 表面疲労; コンポジットレジン; 人工歯; 歯科用貴金属系合金; 硬さ; 粘弾性; 表面接触疲労; 疲労寿命; アクリルレジン; 歯冠用レジン; 疲労; フィラー含有率; 動的粘弾性; 重合率; 修復用材料

The purpose of this paper was to investigate the surface contact fatigue of two PMMAs (AC and SU), tow composite resins (ES and SD), three artificial tooth (LP, SP and AT) and three noble metal alloys (T-1, T-4 and 12GS) in an atmosphere of dripped distilled-water at 37℃. Disk specimen 15mm diameter by 2.0mm thick were set into cavity cut in plate of PMMA, and were ground and polished down using water-proof sandpaper followed by 1.0μm alumina and then stored for 24h in distilled water at 37℃. Test was carried out under 200 gf through a ruby ball 2mm diameter, which was rotated at 500rpm, using a rolling-ball device. A surface profile was determined directly on the test specimen at regular intervals. Fatigue life was defined as the number of cycles to produce a track 5μm deep and was determined by interpolation. The fatigue life of AC, ES, SD and SU was ranged from 5.88×10^3～8.82×10^4 cycles. AC and SU without inorganic filler are very much more resistant to contact fatigue than ES containing inorganic filler more. On the other hand, the fatigue life of three artificial tooth (LP, SP and AT) was ranged from 3.1×10^4～5.88×10^4 cycles and LP is lower resistant to contact fatigue than SP and AT. Furthermore three noble metal alloys was ranged from 10^3～10^4 cycles and the two-dimensional profile had a ductility characteristic that is different from two composite resin and artificial tooth.

研究了两种聚甲基丙烯酸甲酯（AC和SU）、两种复合树脂（ES和SD）、三种人工牙（LP、SP和AT）和三种贵金属合金（T-1、T-4和12GS）在37℃滴蒸馏水气氛下的表面接触疲劳。将直径为15mm、厚度为2.0mm的圆盘试样放入PMMA板材中切割的空腔中，用防水砂纸研磨、抛光，再涂上1.0μm氧化铝，在37℃蒸馏水中保存24h。测试通过一个直径2mm的红宝石球，在200 gf下进行，该球以500转/分的速度旋转，使用滚动球装置。每隔一定时间直接在试样上测定表面轮廓。疲劳寿命定义为产生5μm深轨道的循环次数，并通过插值确定。AC、ES、SD和SU的疲劳寿命范围为5.88×10^3~8.82×10^4次。不含无机填料的AC和SU比含无机填料的ES更耐接触疲劳。另一方面，三种人工牙（LP、SP和AT）的疲劳寿命范围为3.1×10^4~5.88×10^4次，LP的抗接触疲劳能力低于SP和AT。三种贵金属合金的循环次数在10^3~10^4次之间，其二维轮廓具有不同于两种复合树脂和人工牙的延展性特征。