本研究是以合成磷酸結合包埋材，來分析探討磷酸結合包埋材的成份比例對其硬化速率的影響，並應用於基底金屬合金之鑄造，探討包埋材之表面結構與鑄造物之完整性。實驗方法：是以石英、白矽土兩者的混合物為耐火材的主要成份(佔總重量80﹪)；並且混合氧化鎂及磷酸氫氨為黏結劑，再分別添加氯化鈉、硼酸、草酸、硫酸鉀、硫酸鈉、硫酸鎂等六種化學藥劑，使包埋材應用於基底金屬合金之鑄造，觀察比較鑄造物之網狀結構的完整性，並以電子顯微鏡(SEM) 觀察鑄造物與包埋材的表面結構；最後再測量鑄造物與蠟型的網狀結構的尺寸大小,換算鑄造物的線性膨脹或收縮的誤差百分比率。實驗結果:黏結劑(氧化鎂與磷酸氫氨)是控制包埋材硬化的主要成份，而氧化鎂量的多寡會影響包埋材的硬化速率。合成之磷酸結合包埋材，其鑄造物的完整性與使用松風UNI VEST NON-PRECIOUS高溫鑄造用包埋材所鑄製之鑄造物相同。添加氯化鈉、硫酸鉀、硫酸鈉等成份之鑄造物的鑄造性完整；添加硼酸之磷酸結合包埋材會與基底金屬合金黏結(Bonding)；添加草酸、硫酸鎂成份之鑄造物有鑄造缺陷；化學藥劑會改變磷酸結合包埋材的結合結構與性質。而合成之磷酸結合包埋材與添加化學藥劑之包埋材所鑄製之鑄造物與蠟型比較之，鑄造物在長度與寬度上有收縮的現象，即鑄造物的尺寸變小了。
The study is synthesize the phosphate-bonded investment to making the dental casts . Experiments analysis the component of phosphate-bonded investment are Fillers ( 80﹪) ;Binders ( 12-15﹪) ; the others Chemical Agents (5-8﹪).
The Component of the phosphate-bonded investment : Fillers :The major component is silica ,as especially are the Quartz、Cristobalite , or the missing of Quartz and Cristobalite. Binders : The major component are Magnesium Oxide (MgO) and Ammonium dihydrogenphosphate (NH4H2PO4) .Chemical Agents: Using the necessary change phosphate-bonded investment properties.
Experiments steps : The phosphate-bonded investment the ratio of 70 setsp with the liquid of UNI Vest Non-Precious investment.(SHOFU them measured the setting process.( UNI Vest Non-Precious investment ,SHOFU is control).The investing and burnout of the synthesize phosphate-bonded investments are using the clinic operative method .The casts of the synthesize phosphate-bonded investments are using the clinic operation method (UNI Vest Non-Precious investments is control ).After burnout the investments and casts compare with the control.
The result:The synthesize phosphate-bonded investment Fillers didn’t setting process, the major setting process is Binders .The casts of the synthesize phosphate-bonded investment as the same as the control.
