两种可压二硅酸锂微晶玻璃材料的微观结构、半透明参数和断裂韧性的研究。

Piya-Orn Suttipongkiat, Montri Ratanajanchai, Kallaya Suputtamongkol
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引用次数: 0

摘要

目的:研究两种不同透光度的GC Initial LiSi Press(LiSi)和IPS e.max Press(e.max)可压制微晶玻璃的微观结构和断裂韧性。材料和方法:检测四组中等不透明度和高半透明水平的LiSi和e.max。在扫描电子显微镜(SEM)下观察了酸蚀样品的晶体形态。每组6个样品制成正方形(12mm’12mm’1.5mm),用分光光度计测量半透明参数(TP)。使用通用试验机通过弯曲表面裂纹(SCF)测定10个条形试样的断裂韧性(KIc),每组试样的尺寸为23 mm’2 mm’4 mm。采用单因素方差分析和Scheffe事后检验进行统计分析。结果:LiSi显示尺寸为1-1.5µm的精细致密晶体,而e.max显示尺寸为3-4µm的长棒状晶体。所有标本的TP值与其半透明度水平一致。两种陶瓷的不同透光率之间的KIc没有统计学差异(P结论:在本研究的范围内,两种二硅酸锂陶瓷的透光率水平都不影响材料的断裂韧性。e.max的断裂韧性在统计学上高于LiSi。
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INVESTIGATION OF MICROSCOPIC STRUCTURE, TRANSLUCENCY PARAMETERS, AND FRACTURE TOUGHNESS OF TWO PRESSABLE LITHIUM DISILICATE GLASS-CERAMIC MATERIALS.

Purpose: To investigate the microscopic structure and fracture toughness of two pressable glass-ceramics-GC Initial LiSi Press (LiSi) and IPS e.max Press (e.max)-with different levels of translucency.

Materials and methods: Two groups each of LiSi and e.max, with medium opacity and high translucency levels, were examined. The crystal morphology of acid-etched specimens was observed under a scanning electron microscope (SEM). Six specimens in each group were fabricated in a square shape (12 ' 12 ' 1.5 mm) to measure translucency parameters (TP) using a spectrophotometer. Ten bar-shaped specimens in each group with dimensions of 23 x 2 x 4 mm were used to determine the fracture toughness (KIc) by a surface crack in flexure (SCF) using a universal testing machine. One-way ANOVA and Scheffe post-hoc tests were used for statistical analysis.

Results: LiSi showed fine dense crystals 1 to 1.5 μm in size, while e.max showed long rod-shaped crystals 3 to 4 μm in size. The TP values of all specimens coincided with their translucency levels. There was no statistical difference in the KIc between different translucency for both ceramics (P < .05). However, the KIc of e.max was significantly higher than that of LiSi at both translucency levels. As a result of larger and longer crystals, e.max provided better crack deviation mechanism to resist the fracture.

Conclusions: Within the limitations of this study, the translucency levels of both lithium disilicate ceramics did not affect the fracture toughness of the materials. The fracture toughness of e.max was statistically higher than LiSi.

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