目的 本实验采用Er:Yag激光对不同厚度、不同材质[牙合]贴面进行体外照射去粘接,通过分析比较Er:Yag激光对于[牙合]贴面、牙体组织微观结构的影响,为激光无创拆除[牙合]贴面提供理论依据。方法 选取新鲜拔除正畸下颌前磨牙,标准化牙体...目的 本实验采用Er:Yag激光对不同厚度、不同材质[牙合]贴面进行体外照射去粘接,通过分析比较Er:Yag激光对于[牙合]贴面、牙体组织微观结构的影响,为激光无创拆除[牙合]贴面提供理论依据。方法 选取新鲜拔除正畸下颌前磨牙,标准化牙体预备后制作3种不同厚度(1.0、1.5、2.0 mm)和不同材质(Vita琥珀瓷、Vita MarkⅡ、润瓷)[牙合]贴面进行粘接,1周后使用Er:Yag激光(2.5、3.5 W)照射[牙合]贴面并记录时间。扫描电镜(SEM)观察去除后的微观形态。结果 润瓷[牙合]贴面经2.5或3.5 W Er:Yag激光长时间(>20 min)照射后仍无法取下;2.5 W Er:Yag激光去除粘接时间:1.0 mm Vita琥珀瓷组(96.0 s±16.0 s)大于1.0 mm Vita MarkⅡ组(84.5 s±19.5s)(P<0.05);1.5mm Vita琥珀瓷组(246.5s±13.5s)大于1.5mm VitaMarkⅡ组(170.0s±14.0s)(P<0.05);3.5 W Er:Yag激光去除粘接时间:2.0 mm Vita琥珀瓷组(381.0 s±24.0 s)大于2.0 mm Vita MarkⅡ组(341.5 s±26.5 s)。结论 同种材质、相同厚度情况下:激光功率越大,拆除时间越短,当功率较小时,可能导致[牙合]贴面无法拆除。相同厚度、相同功率情况下:激光穿透瓷块到达粘接层可能对瓷块结构产生影响。同种材料、相同功率情况下:瓷块厚度越厚,拆除所需时间越长,所需功率越高。激光无法直接拆除树脂类[牙合]贴面。展开更多
Computer assisted design/computer assisted machining (CAD/CAM) technology has received considerable clinical and research interest from modern dental practices as a means of delivering all-ceramic restorations. Up to ...Computer assisted design/computer assisted machining (CAD/CAM) technology has received considerable clinical and research interest from modern dental practices as a means of delivering all-ceramic restorations. Up to now the CAD/CAM system with zirconia has the highest fracture strength in all all-ceramic materials, and consistently enabled the most esthetic, lifelike reproduction of natural dentition. They have been widely received by both dentists and patients. The CAD/CAM system with zirconia is indicated for crowns and bridges in natural teeth or implants and telescope dentures, the CAD/CAM with zirconia can be placed anywhere in the mouth, and can replace the porcelain crowns and bridges for single crown and bridges less than 6 units. This paper described the techniques of CAD/CAM system with zirconia in fabrication of crowns, bridges, telescope dentures and implant dentures with colored illustrations.展开更多
文摘目的 本实验采用Er:Yag激光对不同厚度、不同材质[牙合]贴面进行体外照射去粘接,通过分析比较Er:Yag激光对于[牙合]贴面、牙体组织微观结构的影响,为激光无创拆除[牙合]贴面提供理论依据。方法 选取新鲜拔除正畸下颌前磨牙,标准化牙体预备后制作3种不同厚度(1.0、1.5、2.0 mm)和不同材质(Vita琥珀瓷、Vita MarkⅡ、润瓷)[牙合]贴面进行粘接,1周后使用Er:Yag激光(2.5、3.5 W)照射[牙合]贴面并记录时间。扫描电镜(SEM)观察去除后的微观形态。结果 润瓷[牙合]贴面经2.5或3.5 W Er:Yag激光长时间(>20 min)照射后仍无法取下;2.5 W Er:Yag激光去除粘接时间:1.0 mm Vita琥珀瓷组(96.0 s±16.0 s)大于1.0 mm Vita MarkⅡ组(84.5 s±19.5s)(P<0.05);1.5mm Vita琥珀瓷组(246.5s±13.5s)大于1.5mm VitaMarkⅡ组(170.0s±14.0s)(P<0.05);3.5 W Er:Yag激光去除粘接时间:2.0 mm Vita琥珀瓷组(381.0 s±24.0 s)大于2.0 mm Vita MarkⅡ组(341.5 s±26.5 s)。结论 同种材质、相同厚度情况下:激光功率越大,拆除时间越短,当功率较小时,可能导致[牙合]贴面无法拆除。相同厚度、相同功率情况下:激光穿透瓷块到达粘接层可能对瓷块结构产生影响。同种材料、相同功率情况下:瓷块厚度越厚,拆除所需时间越长,所需功率越高。激光无法直接拆除树脂类[牙合]贴面。
文摘Computer assisted design/computer assisted machining (CAD/CAM) technology has received considerable clinical and research interest from modern dental practices as a means of delivering all-ceramic restorations. Up to now the CAD/CAM system with zirconia has the highest fracture strength in all all-ceramic materials, and consistently enabled the most esthetic, lifelike reproduction of natural dentition. They have been widely received by both dentists and patients. The CAD/CAM system with zirconia is indicated for crowns and bridges in natural teeth or implants and telescope dentures, the CAD/CAM with zirconia can be placed anywhere in the mouth, and can replace the porcelain crowns and bridges for single crown and bridges less than 6 units. This paper described the techniques of CAD/CAM system with zirconia in fabrication of crowns, bridges, telescope dentures and implant dentures with colored illustrations.
