CAD/CAM纯钛烤瓷冠的抗疲劳性与抗折性分析
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摘要
目的:比较CAD/CAM纯钛烤瓷冠及镍铬烤瓷冠的抗疲劳性与抗折性。方法:制作前磨牙形态镍铬合金烤瓷冠(Ni组)、CAD/CAM纯钛烤瓷冠(Ti组)各12个。为缩小2组试件之间的尺寸差异,制作过程中对试件进行扫描、图像测量及反馈调整。将所有烤瓷冠粘结于统一切削制作的纯钛代型上,经过5000次冷热循环(5～55℃)和75000次50 N的往复加载后,再接受静态加载至崩瓷,获得崩瓷时的载荷力值(F)。折裂面置于体式显微镜下,观察折裂范围及破坏形式。采用SPSS13.0软件包对数据进行统计学分析。结果:2组试件崩瓷时的载荷力值分别为Ni组(1645±356)N、Ti组(1555±331)N,差异无统计学意义(P=0.525)。折裂主要发生在冠的舌1/3。Ti组有3个试件为界面破坏,其余为混合破坏;而Ni组均为混合破坏。结论:CAD/CAM纯钛烤瓷冠具有与镍铬合金烤瓷冠相近的抗疲劳性及抗折性。
PURPOSE: To compare the fatigue and fracture resistance of metal ceramic crowns(MCCs) with nickel-chromium and CAD/CAM-fabricated titanium copings. METHODS: Twelve premolar MCCs were fabricated with cast nickel-chromium alloy(Ni group) and CAD/CAM-fabricated titanium(Ti group) copings, respectively. To minimize the differences among specimens, the geometric dimensions of the MCCs were tested with a laboratory scanner and digital measurement software and then adjusted. After cemented to identically milled titanium dies, each specimen was subjected to thermocycling(5-55℃, 5000 cycles) and cyclic loading(75000 cycles) test, followed by a static load-to-fracture test to measure the fracture loads(F). The fractures were characterized using stereomicroscope. SPSS13.0 software package was used for statistical analysis. RESULTS: The mean fracture loads were(1645±356)N for Ni group and(1555±331)N for Ti group. No significant difference was observed(P=0.525). Most of the fractures were confined to the palatal third. The chief failure mode for all specimens from Ni group and most of the specimens from Ti groups was mixed failure. Adhesive failure was noted in 3 specimens from Ti group. CONCLUSIONS: The fracture resistance of MCCs with CAD/CAM-fabricated titanium copings is similar to that of MCCs with nickel-chromium copings.
PURPOSE: To compare the fatigue and fracture resistance of metal ceramic crowns(MCCs) with nickel-chromium and CAD/CAM-fabricated titanium copings. METHODS: Twelve premolar MCCs were fabricated with cast nickel-chromium alloy(Ni group) and CAD/CAM-fabricated titanium(Ti group) copings, respectively. To minimize the differences among specimens, the geometric dimensions of the MCCs were tested with a laboratory scanner and digital measurement software and then adjusted. After cemented to identically milled titanium dies, each specimen was subjected to thermocycling(5-55℃, 5000 cycles) and cyclic loading(75000 cycles) test, followed by a static load-to-fracture test to measure the fracture loads(F). The fractures were characterized using stereomicroscope. SPSS13.0 software package was used for statistical analysis. RESULTS: The mean fracture loads were(1645±356)N for Ni group and(1555±331)N for Ti group. No significant difference was observed(P=0.525). Most of the fractures were confined to the palatal third. The chief failure mode for all specimens from Ni group and most of the specimens from Ti groups was mixed failure. Adhesive failure was noted in 3 specimens from Ti group. CONCLUSIONS: The fracture resistance of MCCs with CAD/CAM-fabricated titanium copings is similar to that of MCCs with nickel-chromium copings.
引文
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[13] Aboushelib MN, Feilzer AJ, Kleverlaan CJ. Bridging the gap between clinical failure and laboratory fracture strength tests using a fractographic approach[J]. Dent Mater, 2009, 25(3):383-391.
[14] Morresi AL, D'Amario M, Capogreco M, et al. Thermal cycling for restorative materials:does a standardized protocol exist in laboratory testing? A literature review[J]. J Mech Behav Biomed Mater, 2014, 29(1):295-308.
[15] Gale MS, Darvell BW. Thermal cycling procedures for laboratory testing of dental restorations[J]. J Dent, 1999, 27(2):89-99.
[16] Rosentritt M, Behr M, van der Zel JM, et al. Approach for evaluating the influence of laboratory simulation[J]. Dent Mater,2009, 25(3):348-352.
[17] Elshiyab SH, Nawafleh N, George R. Survival and testing parameters of zirconia-based crowns under cyclic loading in an aqueous environment:a systematic review[J]. J Investig Clin Dent, 2017, 8(4):e12261.
[18] Kim B, Zhang Y, Pines M, et al. Fracture of porcelain-veneered structures in fatigue[J]. J Dent Res, 2007, 86(2):142-146.
[19]谭勇,高勃.热循环和机械循环对切削Ti2448和纯钛金瓷结合强度的影响[J].华西口腔医学杂志, 2016, 34(1):54-58.
[20] Ferrario VF, Sforza C, Serrao G, et al. Single tooth bite forces in healthy young adults[J]. J Oral Rehabil, 2004, 31(1):18-22.
[21] Gibbs CH, Mahan PE, Lundeen HC, et al. Occlusal forces during chewing and swallowing as measured by sound transmission[J]. J Prosthet Dent, 1981, 46(4):443-449.
[2]任卫红,郭天文.钛的氧化行为对钛瓷结合力的影响[J].实用口腔医学杂志, 2007, 23(4):554-557.
[3] Haag P, Nilner K. Bonding between titanium and dental porcelain:a systematic review[J]. Acta Odontol Scand, 2010, 68(3):154-164.
[4]郭慧. 4种纯钛专用瓷粉对钛瓷结合强度的影响[J].口腔医学研究, 2012, 28(5):476-482.
[5]连颂峰,林敬凯,蔡坤灿,等.纯钛烤瓷冠与镍铬烤瓷冠抗折力的对比研究[J].口腔医学研究, 2017, 33(8):885-888.
[6]吴素然,张钊,袁硕,等. CAD/CAM纯钛和铸造纯钛与瓷结合强度的对比研究[J].实用口腔医学杂志, 2015, 31(3):327-330.
[7] Zhang CC, Ye JT, Zhang YP, et al. Effect of titanium preoxidation on wrought pure titanium to ceramic bond strength[J].J Prosthet Dent, 2013, 109(2):106-112.
[8] Elsaka SE. Influence of surface treatment on adhesion of porcelain to titanium[J]. J Prosthodont, 2013, 22(6):465-471.
[9] Golebiowski M, Wolowiec E, Klimek PL. Airborne-particle abrasion parameters on the quality of titanium-ceramic bonds[J].J Prosthet Dent, 2015, 113(5):453-459.
[10]王晓静,王国伟,惠光艳,等.磁控溅射ZrSiN/ZrO2复合梯度涂层纯钛表面对钛瓷结合强度的影响[J].实用口腔医学杂志,2016, 32(5):635-639.
[11] Marcelli E, Costantino ML, Villa T, et al. Effect of intermediate ZrO2-CaO coatings deposited by cold thermal spraying on the titanium-porcelain bond in dental restorations[J]. J Prosthet Dent,2014, 112(5):1201-1211.
[12] Alsadon O, Patrick D, Johnson A, et al. Fracture resistance of zirconia-composite veneered crowns in comparison with zirconiaporcelain crowns[J]. Dent Mater J, 2017, 36(3):289-295.
[13] Aboushelib MN, Feilzer AJ, Kleverlaan CJ. Bridging the gap between clinical failure and laboratory fracture strength tests using a fractographic approach[J]. Dent Mater, 2009, 25(3):383-391.
[14] Morresi AL, D'Amario M, Capogreco M, et al. Thermal cycling for restorative materials:does a standardized protocol exist in laboratory testing? A literature review[J]. J Mech Behav Biomed Mater, 2014, 29(1):295-308.
[15] Gale MS, Darvell BW. Thermal cycling procedures for laboratory testing of dental restorations[J]. J Dent, 1999, 27(2):89-99.
[16] Rosentritt M, Behr M, van der Zel JM, et al. Approach for evaluating the influence of laboratory simulation[J]. Dent Mater,2009, 25(3):348-352.
[17] Elshiyab SH, Nawafleh N, George R. Survival and testing parameters of zirconia-based crowns under cyclic loading in an aqueous environment:a systematic review[J]. J Investig Clin Dent, 2017, 8(4):e12261.
[18] Kim B, Zhang Y, Pines M, et al. Fracture of porcelain-veneered structures in fatigue[J]. J Dent Res, 2007, 86(2):142-146.
[19]谭勇,高勃.热循环和机械循环对切削Ti2448和纯钛金瓷结合强度的影响[J].华西口腔医学杂志, 2016, 34(1):54-58.
[20] Ferrario VF, Sforza C, Serrao G, et al. Single tooth bite forces in healthy young adults[J]. J Oral Rehabil, 2004, 31(1):18-22.
[21] Gibbs CH, Mahan PE, Lundeen HC, et al. Occlusal forces during chewing and swallowing as measured by sound transmission[J]. J Prosthet Dent, 1981, 46(4):443-449.