一种新型直接放置陶瓷修复材料的孔隙率评估及孔径分布

Porosity evaluation and pore size distribution of a novel directly placed ceramic restorative material.

作者信息

Geirsson Jónas, Thompson Jeffrey Y, Bayne Stephen C

机构信息

Department of Operative Dentistry, School of Dentistry, University of North Carolina at Chapel Hill, 413 Brauer Hall, CB# 7450, Chapel Hill, NC 27599-7450, USA.

出版信息

Dent Mater. 2004 Dec;20(10):987-95. doi: 10.1016/j.dental.2004.07.003.

DOI:10.1016/j.dental.2004.07.003

PMID:15501328

Abstract

OBJECTIVES

The aim of this in vitro study was to compare porosity, i.e. voids or pores due to placement, of a new directly placed ceramic restorative material (DoxaDent, Doxa Certex AB, Uppsala, Sweden) to a glass ionomer (Fuji IX, GC Corporation, Tokyo, Japan), a hybrid composite control (Filtek Z250, 3M ESPE St Paul, MN, USA) and an amalgam control (Tytin, Kerr Orange, CA, USA). Pore distribution and size were determined for each material tested.

METHODS

Standardized MOD preparations (one operator) on 20 extracted human molars had gingival margins located above and below the CEJ. Restored teeth (5 teeth/material) were sectioned in mesio-distal directions (two sections/tooth; n=10/group). Sections were polished through 1 microm Al2O3 abrasive. Porosity levels and size distributions were measured using SEM. Effects of different gingival extensions of inter-proximal boxes on porosity levels and distributions were investigated (mesial, occlusal, and distal regions).

RESULTS

No MOD region was free of pores. Porosity in mesial, occlusal and distal boxes, respectively, for each restorative material were (vol%): Tytin: 1.3(0.9), 2.9(2.1), and 2.9(1.4); Filtek Z250: 2.6(1.0), 2.9(1.0), and 2.6(0.8); Fuji IX: 8.8(1.9), 7.9(1.7), and 7.7(1.8); Doxadent: 13.0(1.8), 12.4(1.7), and 11.5(1.4). Overall porosity ranged from 2.4(0.9)% for Kerr Tytin, 2.7(0.7)% for Filtek Z250, 8.0(1.1)% for GC Fuji IX, and 12.3(1.1)% for Doxadent. There was no difference between Z250 composite and Tytin amalgam, but differences existed between them with Fuji IX and Doxadent. No statistically significant difference (p>0.05) in porosity occurred among different restoration regions (mesial, distal and occlusal box) for any material. Total porosity levels for different measurement methods (point counting versus direct counting) were remarkable consistent (p>0.05).

SIGNIFICANCE

Based on results of this limited study, the new directly placed ceramic restorative material (Doxadent) contains significantly (p<0.05) higher bulk porosity levels than both amalgam and composite. This may explain the lower than expected mechanical property values reported in other studies.

摘要

目的

本体外研究旨在比较一种新型直接放置的陶瓷修复材料（DoxaDent，瑞典乌普萨拉的Doxa Certex AB公司）与玻璃离子水门汀（Fuji IX，日本东京的GC公司）、混合复合树脂对照材料（Filtek Z250，美国明尼苏达州圣保罗的3M ESPE公司）以及汞合金对照材料（Tytin，美国加利福尼亚州橙县的Kerr公司）的孔隙率，即因材料放置而产生的空隙或气孔。测定每种测试材料的孔隙分布和大小。

方法

在20颗拔除的人磨牙上制备标准化的MOD洞形（由一名操作人员操作），龈缘位于釉牙骨质界上方和下方。修复后的牙齿（每种材料5颗牙齿）沿近远中方向切片（每颗牙齿两片；每组n = 10）。切片用1微米的Al2O3磨料抛光。使用扫描电子显微镜测量孔隙率水平和大小分布。研究邻面盒不同龈向延伸对孔隙率水平和分布的影响（近中、咬合和远中区域）。

结果

没有MOD区域完全没有孔隙。每种修复材料在近中、咬合和远中盒中的孔隙率（体积百分比）分别为：Tytin：1.3(0.9)、2.9(2.1)和2.9(1.4)；Filtek Z250：2.6(1.0)、2.9(1.0)和2.6(0.8)；Fuji IX：8.8(1.9)、7.9(1.7)和7.7(1.8)；Doxadent：13.0(1.8)、12.4(1.7)和11.5(1.4)。总体孔隙率范围为：Kerr Tytin为2.4(0.9)%，Filtek Z250为2.7(0.7)%，GC Fuji IX为8.0(1.1)%，Doxadent为12.3(1.1)%。Z250复合树脂和Tytin汞合金之间没有差异，但它们与Fuji IX和Doxadent之间存在差异。对于任何材料，不同修复区域（近中、远中盒和咬合盒）的孔隙率在统计学上没有显著差异（p>0.05）。不同测量方法（点计数与直接计数）的总孔隙率水平非常一致（p>0.05）。