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Effect of Milling Protocols on Trueness and Precision of Ceramic Crowns.

铣削方案对烤瓷冠真度和精度的影响。

  • 影响因子:1.81
  • DOI:10.1111/jopr.13245
  • 作者列表:"Al Hamad KQ","Al-Rashdan RB","Al-Rashdan BA","Baba NZ
  • 发表时间:2021-02-01
Abstract

PURPOSE:To investigate the effect of different milling protocols for different ceramic materials on the trueness and precision of milled ceramic crowns. MATERIALS AND METHODS:A definitive impression from a patient requiring a ceramic crown was used to fabricate forty glass ceramic crowns (VITABLOCS mark II, Vita Zahnfabrik) milled with wet, hard milling protocol, and 40 zirconia crowns (inCoris TZI, Dentsply, Sirona) milled with dry, soft milling protocol, using a 5-axis milling machine (inLab MC X5; Dentsply Sirona). Trueness and precision for different crown areas were evaluated with a 3D evaluation software (Geomagic Control X, 3D systems). Statistical analysis was performed between the 2 crown types with independent t-test, and analysis of variances followed by Bonferroni tests among crown areas for each crown. RESULTS:All areas of the glass ceramic crowns had higher trueness than the zirconia crown areas (p < 0.05). Crown areas of each crown type had significantly different trueness values (p < 0.001, F = 175.17 for glass crowns, p < 0.001, F = 35.04 for zirconia crowns). Glass crowns had 3.78 µm precision, while zirconia crowns had 4.12 µm precision, with a precision difference range between the 2 types of crowns from 0.32 µm for the inner surface to 6.5 µm for the marginal surface. CONCLUSIONS:Type of ceramic material and milling protocol affected trueness of the milled crown, with higher trueness for the hardmilled glass crowns than the soft milled zirconia crowns. Soft milled zirconia crowns were generally overmilled in comparison with the reference design and glass crowns. However, glass crowns exhibited more undermilling in thin and deep areas. The crown area affected trueness, with external areas having better trueness than internal areas. The 5-axis milling machine had high precision, which was minimally affected by the ceramic type, milling protocol, or crown area.

摘要

前言: 目的: 探讨不同陶瓷材料的不同铣削方案对磨制烤瓷冠的真伪及精度的影响。 材料和方法: 使用一名需要陶瓷冠的患者的明确印象来制作四十个湿硬铣削方案研磨的玻璃陶瓷冠 (VITABLOCS mark II,Vita Zahnfabrik) 和40个干软铣削方案研磨的氧化锆冠 (inCoris TZI,Dentsply,Sirona),使用5轴铣床 (inLab MC X5; Dentsply Sirona)。用3D评估软件 (Geomagic Control X,3D系统) 评估不同冠部区域的真实性和精度。采用独立t检验对2种牙冠类型进行统计学分析,并对每个牙冠的牙冠区域进行Bonferroni检验后进行方差分析。 结果: 玻璃烤瓷冠全冠面积均高于氧化锆冠面积 (p <0.05)。各冠类型的冠面积具有显著不同的真度值 (p <0.001,玻璃冠F = 175.17,p <0.001,氧化锆冠F = 35.04)。玻璃冠的精度为3.78微米,而氧化锆冠的精度为4.12微米,两种冠的精度差异范围从内表面的0.32微米到边缘表面的6.5微米。 结论: 陶瓷材料的类型和铣削方案影响铣削冠的真度,硬磨玻璃冠的真度高于软磨氧化锆冠。与参考设计和玻璃牙冠相比,软磨氧化锆牙冠通常被覆盖。然而,玻璃冠在薄而深的区域表现出更多的下磨。冠区影响真伪,外部区域的真伪优于内部区域。5轴铣床具有高精度,受陶瓷类型,铣削方案或冠面积的影响最小。

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DOI:10.1080/14656566.2020.1814255
作者列表:["Sawada H","Oeda T","Kohsaka M","Tomita S","Umemura A","Park K","Yamamoto K","Kiyohara K"]

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发表时间:2021-03-24
DOI:10.1007/s11033-021-06299-9
作者列表:["Louvrier A","Terranova L","Meyer C","Meyer F","Euvrard E","Kroemer M","Rolin G"]

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