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首页> 外文期刊>The Journal of Prosthetic Dentistry >Comparison of cast Ti-Ni alloy clasp retention with conventional removable partial denture clasps.
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Comparison of cast Ti-Ni alloy clasp retention with conventional removable partial denture clasps.

机译：铸造Ti-Ni合金扣环保持力与常规可摘局部义齿扣环的比较。

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STATEMENT OF PROBLEM: The elastic property of Ti-Ni alloy may be a desirable property for cast removable partial dentures. However, little is known about the retentive properties of cast Ti-Ni alloy clasps. PURPOSE: This in vitro study investigated the retentive force of various types of clasps during repeated cycles of placement and removal to determine whether Ti-Ni alloy clasps maintain their initial retentive force under varied conditions, including different retentive undercut depths and clasp size (thickness and width). MATERIAL AND METHODS: The test models were developed using a mandibular dentiform with a horizontal plane of occlusion. Two complete metal abutment crowns were made for the left second molar, differing only in retentive undercut depths. A total of 98 clasps (n=7) were fabricated, including 14 wrought wire clasps and 28 clasps from each of the following alloys: Co-Cr alloy (Biosil), Type IV gold alloy (Cast-4), and Ti-Ni alloy (TN-10). Clasps were made to engage one of 2 retentive undercut depths (0.25 mm or 0.75 mm) and were made in 2 sizes (0.8 mm or 1.4 mm). Each clasp was radiographically examined for casting defects and porosity. The force (N) required to remove the clasps was measured using a universal testing machine with a crosshead speed of 10 mm/min. After measuring the retentive force, a masticatory simulator was used to cycle the clasps on and off the metal crown 500 times, simulating the insertion and removal of a removable partial denture clasp. The cycling sequence was repeated 10 times, and retention force was measured after each sequence. The internal surface of the clasp arms was examined for evidence of metal fatigue using scanning electron microscopy. Data were subjected to 2-way and 4-way analysis of variance, followed by Scheffe's multiple comparison test (alpha=.05). RESULTS: Co-Cr alloy and gold alloy clasps in the 0.25-mm retentive undercut groups experienced a gradual decrease in retentive force measurements (P<.001). In contrast, the Ti-Ni alloy clasps maintained a retentive force of approximately 1.8 N and 2.6 N for the 0.8 mm and 1.4 mm clasp groups, respectively. Although Ti-Ni alloy clasps' retentive force was reduced slightly after the first cycling sequence, it was negligible compared with other clasps tested. The wrought wire clasps also retained their retentive force until the final cycling sequence. A similar trend was found in the clasp groups engaging 0.75-mm retentive undercuts. CONCLUSION: Although the end-point retention for all the clasps was similar, there was less change in the retentive force of the cast Ti-Ni alloy clasps after repeated cycling sequences of simulated placement and removal.
机译：问题陈述：Ti-Ni合金的弹性性能可能是铸造可摘局部义齿的理想性能。然而，关于铸造的Ti-Ni合金表扣的保持性能知之甚少。目的：这项体外研究调查了各种类型的扣环在重复放置和移除过程中的保持力，以确定Ti-Ni合金扣环在各种条件下（包括不同的保持底切深度和扣环尺寸（厚度和厚度）是否保持其初始保持力。宽度）。材料与方法：该测试模型是使用具有水平咬合平面的下颌牙形开发的。左侧的第二颗磨牙制作了两个完整的金属基台冠，只是保持性底切深度不同。总共制造了98个扣环（n = 7），包括14种锻铁线扣和28种扣环，分别来自以下合金：Co-Cr合金（Biosil），IV型金合金（Cast-4）和Ti-Ni合金（TN-10）。制成的搭扣可啮合2个保持性底切深度（0.25毫米或0.75毫米）之一，并制成2种尺寸（0.8毫米或1.4毫米）。对每个扣环进行射线照相检查以检查铸件缺陷和孔隙率。使用万能试验机以10 mm / min的十字头速度测量卸下扣环所需的力（N）。在测量固位力之后，使用咀嚼模拟器将扣环在金属冠上旋转500次，以模拟可移动局部义齿扣的插入和移除。将循环序列重复10次，并在每个序列之后测量保持力。使用扫描电子显微镜检查了扣臂的内表面是否有金属疲劳的迹象。对数据进行方差的2通和4通分析，然后进行Scheffe的多重比较检验（alpha = .05）。结果：0.25 mm固位咬边组中的Co-Cr合金和金合金扣环的固位力测量值逐渐降低（P <.001）。相比之下，Ti-Ni合金表扣对于0.8 mm和1.4 mm表扣组分别保持约1.8 N和2.6 N的保持力。尽管在第一次循环后，Ti-Ni合金表扣的保持力略有降低，但与其他测试表扣相比，可以忽略不计。锻钢线扣也保持了它们的保持力，直到最终循环。在采用0.75 mm固位咬边的扣环组中也发现了类似的趋势。结论：尽管所有扣环的端点保持力相似，但经过反复的模拟放置和移除循环后，铸造Ti-Ni合金扣环的保持力变化较小。

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