反复烧结对选择性激光熔覆钴铬合金烤瓷冠边缘微渗漏的影响

上海口腔医学 ›› 2016, Vol. 25 ›› Issue (6): 663-667.

反复烧结对选择性激光熔覆钴铬合金烤瓷冠边缘微渗漏的影响

钟群, 彭艳, 邬雪颖, 翁佳炜

上海市口腔病防治院·上海市口腔医院,上海 200031

收稿日期:2016-08-02 出版日期:2016-12-25 发布日期:2016-12-29
通讯作者: 钟群,E-mail: zhongqun681115@qq.com
作者简介:钟群（1968-）,男,学士,主任医师
基金资助:
上海市口腔病防治院院级基金（SSDC-2014-14）

Effects of repeated firing on microleakage of selective laser melting ceramic crowns

ZHONG Qun, PENG Yan, WU Xue-ying, WENG Jia-wei

Shanghai Stomatological Hospital. Shanghai 200031, China

Received:2016-08-02 Online:2016-12-25 Published:2016-12-29

摘要/Abstract

摘要： 目的研究反复烧结对选择性激光熔覆钴铬合金烤瓷冠边缘微渗漏的影响。方法选择50个离体磨牙,随机平均分成2组,A组设计135°浅凹状肩台,B组设计90°直角肩台,常规牙备并制作SLM钴铬合金基底冠。在预氧化,第1次遮色瓷烧结、第2次遮色瓷烧结和体瓷烧结后将各组25个试件随机分为5组,分别予以1~5次釉瓷烧结。所有试件用玻璃离子粘固并进行5000次冷热循环,采用染料渗入法,用体式显微镜观察边缘微渗漏。采用SPSS 20.0软件包对数据进行统计学分析。结果A组浅凹形肩台组试件在5次烧结前、后微渗漏无显著差异（P>0.05）,而B组直角肩台组试件在反复烧结前、后微渗漏变化有显著差异（P<0.05）。在第5次烧结后,浅凹形肩台组试件（A5）边缘微渗漏显著小于直角形肩台组试件（B5）（P<0.05）。结论反复釉瓷烧结（少于5次）不会对选择性激光熔覆钴铬合金烤瓷冠的边缘微渗漏形成明显影响;相比于直角肩台,浅凹形肩台设计的选择性激光熔覆钴铬合金烤瓷冠更能耐受反复釉瓷烧结。

关键词: 选择性激光熔覆, 钴铬合金, 微渗漏, 烧结

Abstract: PURPOSE: To investigate the effects of repeated firing on microleakage of selective laser melting ceramic crowns. METHODS: Fifty molars were randomly divided into 2 groups (25 teeth in each group). Teeth in group A received a chamfer finish line preparation, whereas teeth in group B received a shoulder finish line. After SLM metal crowns were fabricated, all the crowns received initial oxidation step, opaque firing, dentin firing and glaze firing, then crowns in each group were randomly divided into 5 sub-groups according to different time of clinical firings. Glass ionomer was applied for bonding. After 5000 thermocycles ranging from 5℃ to 55℃, all the specimens was evaluated by dye penetration and then microleakage was examined under light microscopy. The data were analyzed with SPSS 20.0 software package. RESULTS: Microleakage between all specimens of group A were not statistically significant (P>0.05) whereas that of group B were statistically significant (P<0.05); After the fifth time of clinical firing, microleakage of specimens in group B(B5) were significantly higher than that of group A(A5). CONCLUSIONS: Repeated firings had no significant influence on marginal microleakage of SLM ceramic crowns whereas the crowns of chamfer finish lines result in better clinical performance after repeated firings.

Key words: Selective laser melting, Co -Cr alloy, Microleakage, Repeated firing

中图分类号:

R783.1

钟群, 彭艳, 邬雪颖, 翁佳炜. 反复烧结对选择性激光熔覆钴铬合金烤瓷冠边缘微渗漏的影响[J]. 上海口腔医学, 2016, 25(6): 663-667.

ZHONG Qun, PENG Yan, WU Xue-ying, WENG Jia-wei. Effects of repeated firing on microleakage of selective laser melting ceramic crowns[J]. Shanghai Journal of Stomatology, 2016, 25(6): 663-667.

参考文献

[1] Al Jabbari YS, Koutsoukis T, Barmpagadaki X, et al. Metallurgical and interfacial characterization of PFM Co-Cr dental alloys fabricated via casting, milling or selective laser melting [J]. Dent Mater, 2014, 30(4) e79-88.
[2] van Noort R. The future of dental devices is digital [J]. Dent Mater, 2012, 28(1): 3-12.
[3] Xiang N, Xin XZ, Chen J, et al. Metalceramic bond strength of Co-Cr alloy fabricated by selective laser melting[J]. J Dent, 2012, 40(6): 453-457.
[4] Xu D, Xiang N, Wei B. The marginal fit of selective laser melting- fabricated metal crowns: an in vitro study [J]. J Prosthet Dent, 2014, 112(6): 1437-1440.
[5] 陈思宇, 余佳, 陈青娅, 等. 烤瓷烧结对金瓷固定桥边缘适合性的影响 [J]. 四川大学学报(医学版), 2010, 41(3): 536-537.
[6] Vojdani M, Safari A, Mohaghegh M, et al. The effect of porcelain firing and type of finish line on the marginal fit of zirconia copings [J]. J Dent(Shiraz), 2015, 16(2): 113-120.
[7] Sundar MK, Chikmagalur SB, Pasha F. Marginal fit and microleakage of cast and metal laser sintered copings-an in vitro study [J]. J Prosthodont Res, 2014, 58(4): 252-258.
[8] Wu AY, Donovan TE. A modified one-step putty-wash impression technique [J]. J Prosthet Dent, 2007, 98(3): 245-246.
[9] Tay FR, Pashley DH, Hiraishi N, et al. Tubular occlusion prevents water-treeing and through-and-through fluid movement in a single-bottle, one-step self-etch adhesive model [J]. J Dent Res, 2005, 84(10): 891-896.
[10] Tjan AH, Dunn JR, Grant BE. Marginal leakage of cast gold crowns luted with an adhesive resin cement [J]. J Prosthet Dent, 1992, 67(1): 11-15.
[11] Schmid-Schwap M, Graf A, Preinerstorfer A, et al. Microleakage after thermocycling of cemented crowns-a meta-analysis [J]. Dent Mater, 2011, 27(9): 855-869.
[12] Contrepois M, Soenen A, Bartala M, et al. Marginal adaptation of ceramic crowns: a systematic review [J]. J Prosthet Dent, 2013, 110(6): 447-454.
[13] Blatz MB, Sadan A, Martin J, et al. In vitro evaluation of shear bond strengths of resin to densely-sintered high purity zirconium-oxide ceramic after long-term storage and thermal cycling [J]. J Prosthet Dent, 2004, 91(4): 356-362.
[14] Zeng L, Zhang Y, Liu Z, et al. Effects of repeated firing on the marginal accuracy of Co-Cr copings fabricated by selective laser melting [J]. J Prosthet Dent, 2015, 113(2): 135-139.
[15] Fonseca JC, Henriques GE, Sobrinho LC, et al. Stress-relieving and porcelain firing cycle influence on marginal fit of commercially pure titanium and titanium-aluminum-vanadium copings [J]. Dent Mater, 2003, 19(7): 686-691.
[16] Papazoglou E, Brantley WA, Johnston WM. Evaluation of high-temperature distortion of high-palladium metal-ceramic crowns [J]. J Prosthet Dent, 2001, 85(2): 133-140.
[17] Gemalmaz D, Alkumru HN. Marginal fit changes during porcelain firing cycles [J]. J Prosthet Dent, 1995, 73(1): 49-54.
[18] 田孝梅, 曾丽, 魏斌, 等. 激光熔积钴铬合金的热膨胀系数测定 [J].上海口腔医学, 2015, 24(6): 687-689.
[19] Rifat G, Ender K, Yasemin O. Flexural properties of leucite and lithium disilicate ceramic materials after repeated firings [J]. J Dent Sc, 2014, 9(2): 144-150.
[20] Pera P, Gilodi S, Bassi F, et al. In vitro marginal adaptation of alumina porcelain ceramic crowns[J]. J Prosthet Dent, 1994, 72(6): 585-590.