中国组织工程研究

中国组织工程研究 ›› 2011, Vol. 15 ›› Issue (21): 3979-3982.doi: 10.3969/j.issn.1673-8225.2011.21.043

• 组织工程口腔材料 tissue-engineered oral materials • 上一篇    下一篇

四种超硬石膏模型精度及抗弯强度的比较

雷东辉1，杨建军2，安世昌2，李晓飞1，付彤晓1，王春方1   

  1. 青岛大学医学院附属医院，1口腔修复科，2口腔颌面外科，山东省青岛市  266000
  • 收稿日期:2010-11-16 修回日期:2010-12-16 出版日期:2011-05-21 发布日期:2011-05-21
  • 通讯作者: 杨建军，教授，主任医师，硕士生导师，青岛大学医学院附属医院口腔颌面外科，山东省青岛市 266000
  • 作者简介:雷东辉★，女，1983年生，山东省莱芜市人，汉族，青岛大学医学院在读硕士，主要从事口腔修复学方面的研究。

Comparisons of dimensional accuracy and bending resistance among four kinds of super-hard plaster casts

Lei Dong-hui1, Yang Jian-jun2, An Shi-chang2, Li Xiao-fei1, Fu Tong-xiao1, Wang Chun-fang1   

  1. 1Department of Prosthodontics, 2Department of Oral and Maxillofacial Surgery, Affiliated Hospital of Qingdao University Medical College, Qingdao   266000, Shandong Province, China
  • Received:2010-11-16 Revised:2010-12-16 Online:2011-05-21 Published:2011-05-21
  • Contact: Yang Jian-jun, Professor, Chief physician, Master’s supervisor, Department of Oral and Maxillofacial Surgery, Affiliated Hospital of Qingdao University Medical College, Qingdao 266000, Shandong Province, China yjjqd@126.com
  • About author:Lei Dong-hui★, Studying for master’s degree, Department of Prosthodontics, Affiliated Hospital of Qingdao University Medical College, Qingdao 266000, Shandong Province, China leidonghui1@163.com

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481

被引次数

8

摘要：

背景: 在临床上，超硬石膏广泛应用于制作固定义齿、大支架可摘义齿等需精细复制口腔情况的工作模型，其抗弯强度足够抵抗脱模时的力量不会发生模型牙体的折断。但当印模为硬质材料如聚醚橡胶印模等，存在牙体折断现象。
目的：比较4种超硬石膏YCG，丹特纳，贺利氏，穗诚模型的尺寸精度及抗弯强度。
方法:制作三单位固定桥和长方体(50 mm× 10 mm×5 mm)的金属模具,灌注4种超硬石膏模型,分别采用万能工具显微镜和万能试验机测量其尺寸精度及抗弯强度。
结果与结论：YCG、丹特纳、贺利氏、穗诚4种超硬石膏近远中方向尺寸精度均值分别为:15.043，15.034，15.037，15.040 mm，颊舌方向为：7.020，7.015，7.019，7.019 mm，牙体长轴方向为：8.022，8.018，8.019，8.02  mm。4种超硬石膏模型抗弯强度均值分别为：15.687，13.000，22.521，18.675 MPa。4种石膏模型尺寸精度差异无显著性意义 (P > 0.05)，但抗弯强度差异有高度显著性意义(P < 0.01)。贺利氏石膏抗弯强度显著高于其他3种石膏 (P < 0.01)，穗诚石膏抗弯强度显著高于丹特纳(P < 0.01)。说明贺利氏石膏的抗弯强度是4种超硬石膏中最高者，穗诚的抗弯强度高于丹特纳，提示临床上应根据实际情况尽量选择抗弯强度大的石膏材料。

关键词: 超硬石膏, 尺寸精度, 抗弯强度, 工作模型, 口腔生物材料

Abstract:

BACKGROUND: In the clinic, super-hard plaster is widely used for preparation of casts that can duplicate oral cavity situation, such as fixed denture and removable denture. The bending resistance of super-hard plaster can sufficiently resist the force to strip, which would avoid the fracture of tooth model. However, the symptom of tooth model fracture exists when hard material, such as polyether rubber, is used as impression material.
OBJECTIVE: To compare the dimensional accuracy and bending resistance among four kinds of super-hard plaster: YCG, Dentona, Heraeus, and Huicheng.
METHODS: Mental casts including three unit fixed bridge and cuboid (50 mm×10 mm×5 mm) were prepared and then poured with the above-mentioned four kinds of super-hard plaster. Then dimensional accuracy and bending resistance of the casts were measured through the use of universal tool microscope and universal testing machine. 
CONCLUSION AND RESULTS: The proximal-distal dimensional accuracy of YCG, Dentona, Heraeus, and Huicheng super-hard plaster casts was 15.043, 15.034, 15.037 and 15.040 mm, respectively, the buccolingual dimensional accuracy was 7.020, 7.015, 7.019, and 7.019 mm, respectively, the tooth long-axis dimensional accuracy was 8.022, 8.018, 8.019, and 8.02 mm, respectively. The bending resistance of the four super-hard plaster casts was 15.687, 13.000, 22.521, 18.675 MPa, respectively. There was no significant difference in dimensional accuracy (P > 0.05), but there was significant difference in bending resistance (P < 0.01), among these four super-hard plaster casts. The bending resistance of Heraeus super-hard plaster cast was significantly greater compared with the other 3 super-hard plaster casts (P < 0.01), and the bending resistance of Huicheng super-hard plaster cast was significantly greater than that of Dentona super-hard plaster cast (P < 0.01). These findings demonstrate that Heraeus super-hard plaster has the highest bending resistance, followed by Huicheng and YCG super-hard plaster casts, and lastly Dentona super-hard plaster cast. These findings suggest that super-hard plaster cast with greater bending resistance should be chosen as possible according to practical situation.

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