Joukhadar Christelle, Osman Essam, Rayyan Mohammad, Shrebaty Mohammed
Clinical Instructor at Faculty of Dentistry, Beirut Arab University, Beirut, Lebanon.
Professor of Dental Materials, Faculty of Dentistry, Beirut Arab University, Beirut, Lebanon.
J Clin Exp Dent. 2020 Mar 1;12(3):e264-e270. doi: 10.4317/jced.56242. eCollection 2020 Mar.
To compare the effect of Er:YAG Laser and Air particle abrasion (APA) surface treatments on shear bond strength of Y-TZP to composite resin cuboids in the presence and absence of primer application and salivary contamination.
Seventy-two cuboidal shaped specimens 7x7x3 were prepared from Y-TZP using CADCAM, cleaned and sintered. Specimens were divided into 2 main groups (n=36) according to surface treatment method; Air particle abrasion (A) and laser (L). Each group was subdivided into 2 subgroups (N = 18) according to surface modification using primer; each subgroup was further divided into 2 subdivisions (N=9) according to the presence of salivary contamination; APC (Air particle abrasion, primer, contamination), AP (Air particle abrasion, primer), AC (Air particle abrasion, contamination), A (Air particle abrasion), LPC (Laser, primer, contamination), LP (Laser, primer), LC (Laser, contamination), L (Laser). Composite cuboids having dimensions of 6x6x3 were also fabricated using custom made plexi plates. Composite cuboids were cemented centrally to zirconia cuboids and light cured under 5 kg weight for 6 mins. Shear bond strength of specimens was measured utilizing universal testing machine at a crosshead speed of 0.5 mm/min. Failure loads were recorded in Newton. SBS was calculated according to equation: SBS (MPa) = load (N)/area(mm2).
Viewing shear bond strength between studied groups, group APNC (484.02±85.02) showed higher mean value compared to ANPNC (122.09±55.80), also LNPNC (120.87±65.10) showed higher mean value in comparison to LPNC (170.78±53.22). APNC (484.02±85.02) and APC (592.22±189.65) showed higher mean values than LPNC (170.78±53.22) and LPC (3227.66±108.28) in sequence.
APA showed higher SBS values than Er:YAG surface treatment. Primer showed better results than no primer coating. Artificial saliva contamination did not affect the SBS of zirconia compared with no contamination results. Shear bond strength, zirconia, air particle abrasion, Er:YAG laser, primer, contamination.
比较铒钇铝石榴石激光（Er:YAG Laser）和空气颗粒研磨（Air particle abrasion, APA）表面处理在应用和不应用底漆以及存在和不存在唾液污染的情况下，对氧化钇部分稳定四方氧化锆多晶体（Y-TZP）与复合树脂长方体之间剪切粘结强度的影响。
使用计算机辅助设计与制造（CADCAM）从Y-TZP制备72个7×7×3立方体形试样，进行清洁和烧结。根据表面处理方法将试样分为2个主要组（n = 36）；空气颗粒研磨（A）组和激光（L）组。根据是否使用底漆对每组再细分为2个亚组（N = 18）；根据是否存在唾液污染，每个亚组进一步细分为2个细分（N = 9）；APC（空气颗粒研磨、底漆、污染）组、AP（空气颗粒研磨、底漆）组、AC（空气颗粒研磨、污染）组、A（空气颗粒研磨）组、LPC（激光、底漆、污染）组、LP（激光、底漆）组、LC（激光、污染）组、L（激光）组。还使用定制的有机玻璃板制作尺寸为6×6×3的复合树脂长方体。将复合树脂长方体居中粘结到氧化锆长方体上，并在5 kg重量下光固化6分钟。使用万能试验机以0.5 mm/min的十字头速度测量试样的剪切粘结强度。以牛顿记录破坏载荷。根据公式计算剪切粘结强度（SBS）：SBS（MPa）=载荷（N）/面积（mm²）。
观察各研究组之间的剪切粘结强度，APNC组（484.02±85.02）的平均值高于ANPNC组（122.09±55.80），同样，LNPNC组（120.87±65.10）的平均值高于LPNC组（170.78±53.22）。APNC组（484.02±85.02）和APC组（592.22±189.65）的平均值依次高于LPNC组（170.78±53.22）和LPC组（322.76±108.28）。
APA表面处理显示出比Er:YAG表面处理更高的SBS值。使用底漆比不涂底漆效果更好。与无污染结果相比，人工唾液污染对氧化锆的SBS没有影响。剪切粘结强度、氧化锆、空气颗粒研磨、Er:YAG激光、底漆、污染
