Int J Stomatol

Int J Stomatol ›› 2020, Vol. 47 ›› Issue (2): 152-158.doi: 10.7518/gjkq.2020040

• Original Articles • Previous Articles     Next Articles

Comparative study of the retention force of titanium-alloy clasps fabricated through selective laser melting and casting

Liu Chunxu,Lu Yuqing,Jia Luming,Dong Bo,Zhang Qianqian,Yu Haiyang()   

  1. State Key Laboratory of Oral Diseases & National Clinical Research Center for Oral Diseases & Dept. of Prosthodontics, West China Hospital of Stomatology, Sichuan University, Chengdu 610041, China
  • Received:2019-06-11 Revised:2019-12-04 Online:2020-03-01 Published:2020-03-12
  • Contact: Haiyang Yu E-mail:yhyang6812@scu.edu.cn
  • Supported by:
    This study was supported by National Natural Science Foundation of China(81571006)

RichHTML

21

PDF (PC)

489

Abstract:

Objective This study aimed to determine the effects of 3D printing and casting on the retention force of titanium-alloy clasps by simulating clasp removal and wear by patients to provide a reference for the clinical design and manufacture of clasps. Methods Preparatory abutment teeth, crowns, and clasps were designed through computer-aided design. The clasps were designed with two undercut depths of 0.25 and 0.75 mm while the other parameters were held constant. The processing technology was divided into three groups. The experimental group used EOSINT and Concept Laser to 3D print the designed data, whereas the control group used casting technology. A total of 36 groups were set. A universal mechanical tester was used to simulate the cycle test of the clasps with a total cycle of 15 000 times. The initial retention force was recorded, and the retention force was recorded every 1 500 times. Results By using the same processing technology, the retention force of the undercut depth of 0.75 mm was greater than that of 0.25 mm. The retention force of the titanium-alloy clasp formed through selective laser melting (SLM) with the same parameters was greater than that of the clasps fabricated through casting. EOSINT and Concept Laser did not have different retentive forces. Conclusion The retention force of the titanium alloy clasp produced through SLM technology was higher than that of the clasp fabricated through casting. The undercut depth of titanium-alloy clasps machined by casting should be 0.75 mm. Titanium-alloy clasps that can meet clinical requirements can be produced through using digital design, 3D printing, and an undercut depth of 0.25 mm. The retention forces of titanium-alloy clasps fabricated through EOSINT and Concept Laser SLM systems were the same.

Key words: 3D printing, clasp, retention force, titanium alloy

CLC Number: 

  • R783.1

TrendMD: 

Fig 1

Three-dimensional design sketch of clasp, crown and abutment"

Tab 1

SLM parameter setting of titanium alloy clasp"

测量项目 激光功率/W 扫描速度/（mm·s-1） 厚度/mm 扫描间距/mm
实体 280 1 200 0.03 0.14
支撑 60 700 0.06 —

Fig 2

Samples of clasp after printing, heat treatment and polishing"

Fig 3

Three dimensional and physical comparison of two kinds of undercut depth of clasp samples"

Fig 4

Three-dimensional model of experiment sample and stationary fixture"

Tab 2

Retention force change of clasps during 15 000 cycles"

循环次数 EOS CL Cast
Ⅰ Ⅱ Ⅰ Ⅱ Ⅰ Ⅱ
0 8.93±0.64 11.46±0.60 9.66±0.40 11.94±0.43 6.91±0.57 9.68±0.50
1 500 8.19±0.62 10.14±1.22 8.51±0.55 10.97±0.68 6.54±0.89 8.92±0.50
3 000 7.88±0.57 9.64±1.31 7.81±0.65 9.97±0.59 5.92±0.16 8.44±0.50
4 500 7.64±0.61 9.08±1.14 7.36±0.64 9.43±0.73 5.71±0.29 8.13±0.49
6 000 7.28±0.67 8.57±0.97 6.85±0.65 8.95±0.72 5.23±0.36 7.70±0.50
7 500 6.86±0.68 8.12±0.90 6.57±0.70 8.32±0.57 4.98±0.44 7.16±0.30
9 000 6.55±0.51 7.81±0.81 6.42±0.70 7.61±0.63 4.68±0.49 6.67±0.27
10 500 6.25±0.38 7.34±0.78 6.22±0.58 7.22±0.59 4.36±0.22 6.24±0.18
12 000 5.99±0.38 6.98±0.55 6.12±0.54 7.09±0.51 4.14±0.60 5.85±0.20
13 500 5.59±0.40 6.67±0.49 6.03±0.49 7.04±0.47 3.93±0.57 5.50±0.38
15 000 5.37±0.52 6.58±0.44 5.98±0.49 7.01±0.43 3.75±0.56 5.19±0.39

Fig 5

Line chart of retaining force change in 15 000 cycles"

Tab 3

P-values of retention forces per 1 500 cycles for two kinds of undercut depth of clasp samples"

倒凹深度/mm 0 1 500 3 000 4 500 6 000 7 500 9 000 10 500 12 000 13 500 15 000
0.25 0.030 0.164 0.847 0.437 0.254 0.464 0.703 0.909 0.623 0.109 0.052
0.75 0.128 0.164 0.566 0.522 0.444 0.629 0.635 0.765 0.711 0.191 0.108

Fig 6

SEM images on the worn part of the clasp sample after the end of the cycle"

[1] Park JH, Min BK, Yang HS , et al. Clinical applica-tion of mandibular removable partial denture using implant-supported surveyed crown: a case report[J]. J Korean Acad Prosthodont, 2018,56(2):154.
[2] Virard F, Venet L, Richert R , et al. Manufacturing of an immediate removable partial denture with an in-traoral scanner and CAD-CAM technology: a case report[J]. BMC Oral Health, 2018,18(1):120.
[3] 胡丹丹, 吴琳 . 可摘局部义齿临床应用和研究现状[J]. 中国实用口腔科杂志, 2018,11(8):498-503.
Hu DD, Wu L . Clinical application and research status of removable partial denture[J]. Chin J Pract Stomatol, 2018,11(8):498-503.
[4] Castleman LS, Motzkin SM, Alicandri FP , et al. Bio-compatibility of nitinol alloy as an implant material[J]. J Biomed Mater Res, 1976,10(5):695-731.
[5] Faria AC, Rodrigues RC, Rosa AL , et al. Experi-mental titanium alloys for dental applications[J]. J Prosthet Dent, 2014,112(6):1448-1460.
[6] Cruz RS, Lemos CAA, Oliveira HFF , et al. Comparison of the use of titanium-zirconium alloy and titanium alloy in dental implants: a systematic review and meta-analysis[J]. J Oral Implantol, 2018,44(4):305-312.
[7] Torabi K, Farjood E, Hamedani S . Rapid prototyping technologies and their applications in prosthodontics, a review of literature[J]. J Dent (Shiraz), 2015,16(1):1-9.
[8] Park JK, Lee WS, Kim HY , et al. Accuracy eva-luation of metal copings fabricated by computer-aided milling and direct metal laser sintering sys-tems[J]. J Adv Prosthodont, 2015,7(2):122-128.
[9] Tannous F, Steiner M, Shahin R , et al. Retentive forces and fatigue resistance of thermoplastic resin clasps[J]. Dent Mater, 2012,28(3):273-278.
[10] Zheng B, Wang XL, Zheng YX , et al. 3D-printed model improves clinical assessment of surgeons on anatomy[J]. J Robot Surg, 2019,13(1):61-67.
[11] 蒲以松, 王宝奇, 张连贵 . 金属3D打印技术的研究[J]. 表面技术, 2018,47(3):78-84.
Pu YS, Wang BQ, Zhang LG . Metal 3D printing technology[J]. Surf Technol, 2018,47(3):78-84.
[12] Takahashi M, Kikuchi M, Takada Y . Mechanical pro-perties and microstructures of dental cast Ti-6Nb-4Cu, Ti-18Nb-2Cu, and Ti-24Nb-1Cu alloys[J]. Dent Mater J, 2016,35(4):564-570.
[13] Kim D, Park C, Yi YJ , et al. Comparison of cast Ti-Ni alloy clasp retention with conventional removable partial denture clasps[J]. J Prosthet Dent, 2004,91(4):374-382.
[14] Kajima Y, Takaichi A, Nakamoto T , et al. Fatigue strength of Co-Cr-Mo alloy clasps prepared by se-lective laser melting[J]. J Mech Behav Biomed Mater, 2016,59:446-458.
[15] Frank RP, Nicholls JI . A study of the flexibility of wrought wire clasps[J]. J Prosthet Dent, 1981,45(3):259-267.
[16] Soo S, Leung T . Hidden clasps versus C clasps and I bars: a comparison of retention[J]. J Prosthet Dent, 1996,75(6):622-625.
[17] Vallittu PK, Kokkonen M . Deflection fatigue of cobalt-chromium, titanium, and gold alloy cast denture clasp[J]. J Prosthet Dent, 1995,74(4):412-419.
[1] Ma Jianbin,Xue Chaoran,Wang Peiqi,Li Bin,Bai Ding.. Effect of 3D printing orthognathic surgical splints with different dental model offsets on occlusal precision [J]. Int J Stomatol, 2022, 49(3): 296-304.
[2] Zhang Xinchi,Wu Wei. Research progress on 3D printing technology and biomaterials for bone reconstruction in maxillofacial regions [J]. Int J Stomatol, 2020, 47(6): 677-685.
[3] Yu Wanqi,Zhou Yanmin,Zhao Jinghui. Research status of new materials in dental implants [J]. Int J Stomatol, 2019, 46(4): 488-496.
[4] Wang Ke, Xiang Tao, Tang Yaling, Liang Xinhua. Application of 3D printing in oral and maxillofacial surgery education [J]. Inter J Stomatol, 2018, 45(1): 119-124.
[5] Men Qinglin, Zhou Xianhua, Wang Wei. Clinical effect observation of improved aesthetic clasp in distal-extension prosthesis [J]. Inter J Stomatol, 2017, 44(4): 426-429.
[6] Wang Jing, Yuan Rongtao, Dong Qian.. Application of computer aided surgery system and 3D printing technology in the reconstruction of the defects in oral and maxillofacial region [J]. Inter J Stomatol, 2016, 43(6): 725-728.
[7] Zhu Xiaojing, Wang Yan. Research progress on co-deposition of calcium phosphate with bioactive molecules on titanium implant surface [J]. Inter J Stomatol, 2014, 41(5): 617-620.
[8] Zhang Jing, Tang Yi, Wang Shirui, Li Junying, Yu Haiyang. A case report on dental implants in patients with abnormal development of the mandibular nerve [J]. Inter J Stomatol, 2014, 41(3): 292-295.
[9] Qi Jiani1, Lan Jing2.. Research progress on implant-supported magnet-retained overdenture for edentulous denture [J]. Inter J Stomatol, 2014, 41(2): 191-194.
[10] Chen Jianyu1, Zhang Zhiguang1, Li Zifu2.. Application of selective laser melting technique in stomatology [J]. Inter J Stomatol, 2014, 41(1): 97-101.
[11] Liu Changhong.. Repair design of telescopic crown denture retainers [J]. Inter J Stomatol, 2011, 38(6): 627-631.
[12] Wang Qiang1, Na Ying2, Feng Cuijuan2, Zhan Desong1, Zhang Yang2. . Effect of oxidation on the hydrophilic property of the medical nickel titanium alloy [J]. Inter J Stomatol, 2011, 38(5): 506-508.
[13] DU Jin-jin, WANG Dalin.. New development of surface modification of dental titanium and titanium alloy [J]. Inter J Stomatol, 2010, 37(6): 703-706.
[14] LIU Shuang, ZHANG Lian-yun, LI Chang－yi.. Research progress on titanium alloy for dental framework u [J]. Inter J Stomatol, 2010, 37(3): 362-362～364.
[15] FU Dan- li, LIU Li. Resear ch development of cor rosion of titanium in the or al bioenvironment[J]. Inter J Stomatol, 2008, 35(5): 588-588～590.
Viewed
Full text


Abstract

Cited
  Shared   
  Discussed   
[1] . [J]. Foreign Med Sci: Stomatol, 1999, 26(06): .
[2] . [J]. Foreign Med Sci: Stomatol, 1999, 26(06): .
[3] . [J]. Foreign Med Sci: Stomatol, 1999, 26(05): .
[4] . [J]. Foreign Med Sci: Stomatol, 1999, 26(05): .
[5] . [J]. Foreign Med Sci: Stomatol, 1999, 26(05): .
[6] . [J]. Foreign Med Sci: Stomatol, 1999, 26(04): .
[7] . [J]. Foreign Med Sci: Stomatol, 1999, 26(04): .
[8] . [J]. Foreign Med Sci: Stomatol, 1999, 26(04): .
[9] . [J]. Foreign Med Sci: Stomatol, 1999, 26(04): .
[10] . [J]. Foreign Med Sci: Stomatol, 1999, 26(04): .