Elsayed Mohammed E, El-Bayoumi Dalia A, Hebeshi Ahmed M, El-Tamimi Kawkb M
Faculty of Dentistry, Suez Canal University, Ismailia, Egypt.
Faculty of Dentistry, Ain Shams University, Cairo, Egypt.
J Prosthodont. 2024 Jul 22. doi: 10.1111/jopr.13906.
The purpose of this in vitro study was to evaluate the trueness of removable partial denture clasps fabricated with titanium (Ti) through the selective laser melting (SLM) technique compared to cobalt-chromium alloys (CoCr).
A virtual Aker clasp was designed on a scanned tooth, and SLM printers were used to print 20 claps using cobalt chromium (n = 10) and titanium alloy (n = 10). The deviation between the printed clasps and reference design was measured using the surface matching software (Geomagic control x) at rest, retentive tip, reciprocal tip, retentive shoulder, and reciprocal shoulder. An Independent t-test was used to determine the influence of 3D-printed material on the trueness (a = 0.05).
The gap distance in mm between the reference design and printed in titanium showed an average of 0.0001 ±0.0544, 0.0256 ±0.1309, 0.0230 ±0.1028, 0.0701 ±0.1234, and 0.0013 ±0.0735 mm in rest, reciprocal arm tip, retentive arm tip, retentive arm shoulder, and reciprocal arm shoulder, respectively. The gap distance in mm between the reference design and printed clasps in CoCr alloy showed an average of 0.0316 ±0.0692, 0.2783 ±0.1678, 0.1446 ±0.1528, 0.0315 ±0.0906, and 0.0419 ±0.1088 mm in rest, reciprocal arm tip, retentive arm tip, retentive arm shoulder, and reciprocal arm shoulder, respectively. The difference between titanium and CoCr alloys at each observation site was significant.
Clasps fabricated from titanium with SLM printing have the least deviation and better trueness compared to those fabricated from cobalt chromium.
本体外研究的目的是评估与钴铬合金（CoCr）相比，通过选择性激光熔化（SLM）技术用钛（Ti）制造的可摘局部义齿卡环的准确性。
在扫描的牙齿上设计一个虚拟的阿克卡环，并使用SLM打印机用钴铬合金（n = 10）和钛合金（n = 10）打印20个卡环。使用表面匹配软件（Geomagic control x）在静止状态、固位尖端、对抗尖端、固位肩部和对抗肩部测量打印卡环与参考设计之间的偏差。使用独立t检验确定3D打印材料对准确性的影响（α = 0.05）。
参考设计与钛打印卡环之间的间隙距离（mm）在静止状态、对抗臂尖端、固位臂尖端、固位臂肩部和对抗臂肩部的平均值分别为0.0001±0.0544、0.0256±0.1309、0.0230±0.1028、0.0701±0.1234和0.0013±0.0735mm。参考设计与CoCr合金打印卡环之间的间隙距离（mm）在静止状态、对抗臂尖端、固位臂尖端、固位臂肩部和对抗臂肩部的平均值分别为0.0316±0.0692、0.2783±0.1678、0.1446±0.15:28、0.0315±0.0906和0.0419±0.1088mm。在每个观察部位，钛合金和CoCr合金之间的差异具有统计学意义。
与钴铬合金制造的卡环相比，通过SLM打印用钛制造的卡环偏差最小，准确性更高。
