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Fracture Prevention of Esthetic Ceramic Crowns for Posterior Teeth

后牙美观陶瓷冠断裂的预防

基本信息

批准号：
11470418
负责人：
ATSUTA Mitsuru
金额：
$ 9.54万
依托单位：
Nagasaki University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B).
财政年份：
1999
资助国家：
日本
起止时间：
1999 至 2000
项目状态：
已结题

项目摘要

1. Fatigue tests of esthetic ceramic material : Specimens (20×5×1.5 mm) for evaluated tests were prepared by made of the OCC and their surfaces were polished to #220 and #1000. The strengths were measured with a servohydraulic mechanical testing machine. The averages of flexural strength, fatigue strength, and the number of cycles when specimens fractured were 40.9 MPa, 28.8 MPa, and 4.31×10^4 cycles for the #220-group and 45.4 MPa, 35.0 MPa, and 3.29×10^4 cycles for the #1000-group, respectively. These results suggested that the OCC was not breakable material compared with resin composite and that its surface polishing was essential to obtain greater strengths.2. Fatigue tests of the complexes of esthetic ceramic material and dental alloy or composite for core build-up : Specimens joined between the OCC and silver-palladium-copper-gold alloy or composite for core build-up (2 mm in thickness) with adhesive resin cement were prepared for fatigue tests. The averages of flexural strength … More and fatigue strength with the combination of the OCC and alloy were 49.6 MPa and 39.3 MPa for the #220-group and 54.7 MPa and 44.3 MPa for the #1000-group, respectively. On the other hand, their strengths with the combination of the OCC and composite for core build-up were 76.3 MPa and 65.5 MPa for the #220-group and 74.8 MPa and 62.2 MPa for the #1000-group, respectively. These results showed that the strengths of both complexes were improved compared with the single OCC material and that the surface polishing of the OCC material did not influenced both strengths.3. Durability tests of the cemented OCC crown on each of the three abutments : Three types of abutments were prepared with flat occlusal surface of 2 mm in height and deep-chamfer margin of 1 mm in width by use of human tooth, metal, or composite for core build-up. The OCC crowns were luted with adhesive resin cement on each of the three abutments, followed by loading crown to the fracture on the occlusal surface with 5 kgf for 100,000 cycles. The observed fractured loads of OCC crowns on human tooth, metal, and composite were 107 kgf, 192 kgf, and 160 kgf, respectively. The fractured load of the OCC crown on human tooth showed significantly lower value than that of crowns on the other two abutments. Less

1.美观陶瓷材料的疲劳测试：用于评价测试的样品(20×5×1.5mm)由OCC制成，其表面抛光至#220和#1000。用伺服液压机械试验机测量强度。 #220组的弯曲强度、疲劳强度和断裂循环次数的平均值分别为40.9 MPa、28.8 MPa和4.31×10^4循环，#1000组的平均弯曲强度、疲劳强度和3.29×10^4循环分别为45.4 MPa、35.0 MPa和3.29×10^4循环。这些结果表明，与树脂复合材料相比，OCC不是易碎材料，其表面抛光对于获得更大的强度至关重要。 2．美容陶瓷材料和牙科合金或核心构建复合材料的复合物的疲劳测试：制备 OCC 和银-钯-铜-金合金或核心构建复合材料（2 毫米厚）与粘性树脂水泥接合的样本用于疲劳测试。 OCC 和合金组合的平均弯曲强度和疲劳强度对于 #220 组分别为 49.6 MPa 和 39.3 MPa，对于 #1000 组分别为 54.7 MPa 和 44.3 MPa。另一方面，OCC 和复合材料组合用于堆芯的强度分别为#220 组的 76.3 MPa 和 65.5 MPa，#1000 组的强度分别为 74.8 MPa 和 62.2 MPa。结果表明，与单一OCC材料相比，两种复合物的强度均有所提高，且OCC材料的表面抛光并未影响两种复合物的强度。 3．三个基台上的粘固 OCC 冠的耐久性测试：使用人牙、金属或复合材料作为核心构建，制备了三种类型的基台，其平面咬合面高 2 毫米，深倒角边缘宽 1 毫米。 OCC 牙冠在三个基台上分别用树脂粘固剂粘合，然后用 5 kgf 将牙冠加载到咬合面的骨折处，循环 100,000 次。观察到的 OCC 牙冠对人类牙齿、金属和复合材料的断裂载荷分别为 107 kgf、192 kgf 和 160 kgf。人类牙齿上的 OCC 冠的断裂载荷明显低于其他两个基台上的冠。较少的