Effect of polishing method and time on the fitness of CAD/CAM zirconia ceramic crown

doi:10.19439/j.sjos.2023.03.003

Abstract

Abstract: PURPOSE: To compare the effect of different polishing methods and time treatment on the fitness of CAD/CAM zirconia ceramic crowns. METHODS: Sixteen intact maxillary premolars were randomly divided into two groups, group A was treated with silicon carbide burs, while group B was treated with tungsten steel burs. At different polishing time points of the same tooth, digital impressions of each group were obtained, which were used to manufacture CAD/CAM zirconium ceramic crowns. After trial fitting, the gap impressions were obtained by using silicone rubber replication method, and the marginal and internal discrepancies were assessed. The data were statistically analyzed with SPSS 21.0 software package. RESULTS: The difference between the gap values of the marginal and internal markers of group A and group B was not statistically significant(P>0.05). Compared with the no-polishing process, the differences of the marginal gap (39.67±8.35) μm and internal gap (45.18±7.16) μm of group A polished for 4 min, and the marginal gap (51.25±14.73) μm, and internal gap (48.56±6.45) μm of group B polished for 3 min, as well as the marginal gap (48.87±8.90) μm, and internal gap (45.99±7.12) μm of group B polished for 4 min, were all significant(P<0.05). CONCLUSIONS: CAD/CAM zirconia ceramic crowns treated with silicon carbide bur for polishing 4 min and tungsten steel for 3 min has the best fitness.

Key words: Dental preparation, Polishing method and time, Fitness of zirconia ceramic crown, CAD/CAM

CLC Number:

R783.3

ZHAO Chen, BAI Yue-hui, LIU Yang, JIANG Shan-shan, SHANG Qing-long, ZHAO Tian-tian, YUAN Shuo, LI Ning, JIAO Jian-ping. Effect of polishing method and time on the fitness of CAD/CAM zirconia ceramic crown[J]. Shanghai Journal of Stomatology, 2023, 32(3): 236-240.

References

[1] 张蕾, 茹菲亚·祖拉提, 何惠宇, 等. CAD/CAM全瓷髓高嵌体在牙体缺损中的临床应用研究[J]. 口腔医学, 2018, 38(6): 523-527.
[2] 陈世炜, 伍晓红. 根管治疗后下颌切牙瓷贴面与全瓷冠两种修复方式的抗折裂性对比研究[J]. 口腔医学研究, 2020, 36(3): 269-272.
[3] Patzelt SB, Emmanouilidi A, Stampf S, et al.Accuracy of full-arch scans using intraoral scanners[J]. Clin Oral Investig, 2014, 18(6): 1687-1694.
[4] Davidowitz G, Kotick PG.The use of CAD/CAM in dentistry[J]. Dent Clin North Am, 2011, 55(3): 559-570.
[5] Vanlioglu BA, Evren B, Yildiz C, et al.Internal and marginal adaptation of pressable and computer-aided design/computer-assisted manufacture onlay restorations[J]. Int J Prosthodont, 2012, 25(3): 262-264.
[6] Hack G, Liberman L, Vach K, et al.Computerized optical impression making of edentulous jaws-an in vivo feasibility study[J]. J Prosthodont Res, 2020, 64(4): 444-453.
[7] Shamseddine L, Mortada R, Rifai K, et al.Marginal and internal fit of pressed ceramic crowns made from conventional and computer-aided design and computer-aided manufacturing wax patterns: an in vitro comparison[J]. J Prosthet Dent, 2016, 116(2): 242-248.
[8] Mously HA, Finkelman M, Zandparsa R, et al.Marginal and internal adaptation of ceramic crown restorations fabricated with CAD/CAM technology and the heat-press technique[J]. J Prosthet Dent, 2014, 112(2) :249-256.
[9] 张丽, 王频. 2种取模方法对全冠适合性影响的比较研究[J].中国现代医学杂志, 2018, 28(24): 27-31.
[10] Baroudi K, Ibraheem SN.Assessment of chair-side computer aided design and computer aided manufacturing restorations: a review of the literature[J]. J Int Oral Health, 2015, 7(4): 96-104.
[11] McLean JW, von Fraunhofer JA. The estimation of cement film thickness by an in vivo technique[J]. Br Dent J, 1971, 131(3): 107-111.
[12] Kokubo Y, Ohkubo C, Tsumita M, et al.Clinical marginal and internal gaps of Procera AllCeram crowns[J]. J Oral Rehabil, 2005, 32(7): 526-530.
[13] Nakamura T, Tanaka H, Kinuta S, et al.In vitro study on marginal and internal fit of CAD/CAM all-ceramic crowns[J]. Dent Mater J, 2005, 24(3): 456-459.
[14] May LG, Kelly JR.Influence of resin cement polymerization shrinkage on stresses in porcelain crowns[J]. Dent Mater, 2013, 29(10): 1073-1079.
[15] 陈绍孝, 王亭亭, 骆小平. 不同颈缘形态及抛光方法对CAD/CAM全瓷冠边缘适合性的影响[A]//第十二次全国口腔修复学学术会议论文汇编[C]. 长春: 中华口腔医学会, 2018: 83-84.
[16] Ferraris F, Conti A.Superficial roughness on composite surface, composite enamel and composite dentin junctions after different finishing and polishing procedures. part I: roughness after treatments with tungsten carbide vs diamond burs[J]. Int J Esthet Dent, 2014, 9(1): 70-89.
[17] Salamoni Sinhori B, de Andrada MAC, Carpena Lopes G, et al. Influence of teeth preparation finishing on the adaptation of lithium disilicate crowns[J]. Int J Biomater, 2017: 2078526.
[18] Sadid-Zadeh R, Katsavochristou A, Squires T, et al.Accuracy of marginal fit and axial wall contour for lithium disilicate crowns fabricated using three digital workflows[J]. J Prosthet Dent, 2020, 123(1): 121-127.
[19] Zena RB, Khan Z, Von Fraunhofer JA.Shoulder preparations for collarless metal ceramic crowns: hand-planning as opposed to rotary instrumentation[J]. J Prosthet Dent, 1989, 62(3): 273-277.
[20] Pelekanos S, Koumanou M, Koutayas S, et al.Micro-CT evaluation of the marginal fit of different in-ceram alumina copings[J]. Eur J Esthet Dent, 2009, 4(3): 278-292.
[21] Porojan L, Rusu L, Bolos A, et al.Experimental analyses for the mechanical behavior of pressed all-ceramic molar crowns with anatomical design[J]. MATEC Web Conf, 2017, 108(4): 02001.
[22] Laufer BZ, Pilo R, Cardash HS.Surface roughness of tooth shoulder preparations created by rotary instrumentation, hand planing, and ultrasonic oscillation[J]. J Prosthet Dent,1996, 75(1): 4-8.
[23] Price RB, Sutow EJ.Micrographic and profilometric evaluation of the finish produced by diamond and tungsten carbide finishing burs on enamel and dentin[J]. J Prosthet Dent, 1988, 60(3): 311-316.
[24] Wahle J, Wendt SL Jr.Dentinal surface roughness: a comparison of tooth preparation techniques[J]. J Prosthet Dent,1993, 69(2):160-164.
[25] Horne P, Bennani V, Chandler N, et al.Ultrasonic margin preparation for fixed prosthodontics: a pilot study[J]. J Esthet Restor Dent, 2012, 24(3): 201-209.
[26] 李思雨, 段雪飞,曹烨. 应用超声器械改善预备体肩台的效果[J]. 北京大学学报(医学版), 2021, 53(1): 88-94.