牙齒受到外力或嚴重二次蛀牙,造成牙髓裸露。因此治療的方法有活髓治療和根管治療。根管治療是將牙髓全部挖除,留下空的根管,補上根管封填材料,再套上人工牙套。使用根管治療後,牙齒為死亡狀態。由於現代技術的提昇,希望能讓牙齒屬於存活的狀態,所以有活髓治療方法的產生。活髓治療是將裸露的牙髓外層,補上一覆髓治療材料,讓牙髓不受外界的剌激導致死亡。 本研究主要探討介穩水泥添加不同比例之半水石膏的氫氧基磷灰石相變化、固化時間、微觀結構、溫度變化、黏度、微硬度、機械性質、pH值變化、孔隙率及生物相容性。實驗結果顯示,25 wt%石膏經過10天後,沒有二水石膏的殘留,慢慢轉變成氫氧基磷灰石,初始硬化時間約20分鐘之內,可以有縮短手術的時間。pH值為12.5,可以剌激牙髓,使牙髓自我產生硬骨母細胞結構。黏度有明顯的下降,有效提升操作性質,有效提供良好的機械強度,孔隙率約30 %,有助於細胞浸潤,為毒性低的材料且具有生物適應性。由上述結果顯示,本實驗開發出操作性質好、硬化時間短且具有良好的生物相容性之複合材料,極具發展潛力用於覆髓材料。
Human pulp was exposed by trauma or second dental caries seriously. Traditional treatment is root canal treatment. The treatment will remove all human pulp and fill root canal sealing materials. The tooth will be dead. Recently, doctors hope the teeth are vital, so pulp capping therapy will be used. Pulp capping therapy will fill pulp capping materials on exposed pulp. The pulp capping materials will seal the exposed pulp against outside. The study is focused on discussing the influences of different ratios of calcium sulphate hemihydrates in PSC on HAP conversion, micro structure, setting time, pH value, temperature difference, viscosity, Micro-hardness, mechanical properties, porosity, and biocompatibility. The results show the 75 wt% PSC and 25 wt% gypsum soaked in SBF 10 days for short setting below 20 minutes, high pH value, good handling properties, mechanical properties and biocompatility. The porosity that had cell infiltration were 30%. In summary, the partial-stability cement composite prossesses great developing potential to be applied on pulp capping .