Zandparsa Roya, El Huni Rabie M, Hirayama Hiroshi, Johnson Marc I
Clinical Professor, Postgraduate Prosthodontics and Advanced Education in Esthetic and Operative Dentistry, Prosthodontic Division, Tufts University School of Dental Medicine, Boston, Mass.
Former resident, Advanced Education in Implant Dentistry, Tufts University School of Dental Medicine, Boston, Mass.
J Prosthet Dent. 2016 Feb;115(2):230-7. doi: 10.1016/j.prosdent.2015.09.005. Epub 2015 Nov 6.
The wear of tooth structure opposing different advanced dental ceramic systems requires investigation.
The purpose of this in vitro study was to compare the wear of advanced ceramic systems against human enamel antagonists.
Four ceramic systems (IPS e.max Press, IPS e.max CAD, Noritake Super Porcelain EX-3, and LAVA Plus Zirconia) and 1 control group containing human enamel specimens were used in this study (n = 12). All specimens were fabricated as disks 11 mm in diameter and 3 mm thick. The mesiopalatal cusps of the maxillary third molars were prepared to serve as the enamel styluses. All specimens were embedded individually in 25 mm(3) autopolymerizing acrylic resin blocks. Wear was measured with a cyclic loading machine and a newly designed wear simulator. All enamel styluses (cusps) were scanned using the Activity 880 digital scanner (SmartOptics). Data from the base line and follow-up scans were collected and compared with Qualify 2012 3-dimensional (3D) and 2D digital inspection software (Geomagic), which aligned the models and detected the geometric changes and the wear caused by the antagonist specimen. One-way ANOVA was used to analyze the collected data.
After 125,000 bidirectional loading cycles, the mean loss of opposing enamel volume for the enamel disks in the control group was 37.08 μm(3), the lowest mean value for IPS e.max Press system was 39.75 μm(3); 40.58 μm(3) for IPS e.max CAD; 45.08 μm(3) for Noritake Super Porcelain EX-3 system; and 48.66 μm(3) for the Lava Plus Zirconia system. No statically significant differences were found among the groups in opposing enamel volume loss (P=.225) or opposing enamel height loss (P=.149). In terms of opposing enamel height loss, Lava Plus Zirconia system showed the lowest mean value of 27.5 μm. The mean value for the IPS e.max CAD system was 27.91 μm; 29.08 μm for the control enamel; 33.25 μm for the IPS e.max Press system; and 34.75 μm for the Noritake Super Porcelain EX-3 system.
Within the limitations of this in vitro study, no differences were found in the linear and volumetric reduction of enamel cusps abraded against enamel disks and all other ceramic specimens. All ceramic systems exhibited high durability and were wear-friendly to opposing enamel.
需要对与不同先进牙科陶瓷系统相对的牙齿结构磨损情况进行研究。
本体外研究的目的是比较先进陶瓷系统与人类牙釉质对抗物之间的磨损情况。
本研究使用了四种陶瓷系统（IPS e.max Press、IPS e.max CAD、Noritake Super Porcelain EX-3和LAVA Plus氧化锆）以及1个包含人类牙釉质标本的对照组（n = 12）。所有标本均制成直径11毫米、厚3毫米的圆盘。上颌第三磨牙的近中腭尖被制备用作牙釉质探针。所有标本分别嵌入25立方毫米的自凝丙烯酸树脂块中。使用循环加载机和新设计的磨损模拟器测量磨损情况。所有牙釉质探针（牙尖）均使用Activity 880数字扫描仪（SmartOptics）进行扫描。收集基线扫描和随访扫描的数据，并使用Qualify 2012三维（3D）和二维数字检测软件（Geomagic）进行比较，该软件可对齐模型并检测对抗物标本引起的几何变化和磨损。使用单因素方差分析来分析收集的数据。
在125,000次双向加载循环后，对照组牙釉质圆盘相对牙釉质体积的平均损失为37.08立方微米，IPS e.max Press系统的最低平均值为39.75立方微米；IPS e.max CAD为40.58立方微米；Noritake Super Porcelain EX-3系统为45.08立方微米；Lava Plus氧化锆系统为48.66立方微米。在相对牙釉质体积损失（P = 0.225）或相对牙釉质高度损失（P = 0.149）方面，各实验组之间未发现统计学上的显著差异。就相对牙釉质高度损失而言，Lava Plus氧化锆系统的最低平均值为27.5微米。IPS e.max CAD系统的平均值为27.91微米；对照牙釉质为29.08微米；IPS e.max Press系统为33.25微米；Noritake Super Porcelain EX-3系统为34.75微米。
在本体外研究的局限性内，在与牙釉质圆盘和所有其他陶瓷标本摩擦的牙釉质牙尖的线性和体积减少方面未发现差异。所有陶瓷系统均表现出高耐久性，并且对相对的牙釉质磨损友好。
