Sadeghi Mostafa, Davari Abdolrahim, Abolghasami Mahani Amin, Hakimi Hamid
Dept. of Operative Dentistry, School of Dentistry, Rafsanjan University of Medical Sciences, Rafsanjan, Iran.
Dept. of Operative Dentistry, Member of Social Determinants of Oral Health Research Center, Dental School, Shahid Sadoughi University of Medical Sciences, Yazd, Iran.
J Dent (Shiraz). 2015 Mar;16(1):30-6.
Porcelain may fracture or chip if exposed to any traumas and can be repaired by using a resin composite.
This study was aimed to evaluate the influences of Er:YAG laser on shear bond strength (SBS) of resin composite to feldspathic porcelain.
Seventy-two porcelain blocks were divided into six groups (n=12): G1: no treatment (control group); G2: 9% hydrofluoric acid (HF); G3-6 were separately irradiated with Er:YAG laser using four energy parameters: 2W, 100mj (G3); 3W, 150mj (G4); 4W, 200mj (G5) and 5W, 250mj (G6), respectively; and 20 Hz frequency in long-pulse mode. After silane treatment, a resin composite rod was bonded to each of the porcelain block. The SBS was measured following storage and thermocycling. Data were analyzed by one-way ANOVA, Tamhane and Chi-Square tests.
The highest SBS (12.29±3.04 MPa) was obtained with HF (G2). The lowest SBS (2.23±0.60 MPa) was observed in G4, followed by G3 (1.96±0.76 MPa). G6 had a significantly higher SBS (8.00±2.22 MPa) than other laser irradiation groups.
Although, Er:YAG laser irradiation at 5W, 250mJ/20 Hz was effective in promoting adhesion of resin composite to feldspathic porcelain compared with the control group, it cannot be used as a safe alternative method to HF acid. Laser irradiation with the evaluated parameters in this study does not promote an effective adhesion on porcelain surface to create adequate bond for clinical use.
瓷器如果受到任何创伤可能会破裂或崩瓷，可用树脂复合材料进行修复。
本研究旨在评估铒钇铝石榴石（Er:YAG）激光对树脂复合材料与长石质瓷之间剪切粘结强度（SBS）的影响。
将72个瓷块分为六组（n = 12）：G1：未处理（对照组）；G2：9%氢氟酸（HF）；G3 - 6分别使用四个能量参数用Er:YAG激光照射：2W，100mJ（G3）；3W，150mJ（G4）；4W，200mJ（G5）和5W，250mJ（G6），长脉冲模式下频率为20Hz。硅烷处理后，将树脂复合材料棒粘结到每个瓷块上。储存和热循环后测量SBS。数据采用单因素方差分析、塔姆黑尼检验和卡方检验进行分析。
HF处理组（G2）获得最高的SBS（12.29±3.04MPa）。G4组观察到最低的SBS（2.23±0.60MPa），其次是G3组（1.96±0.76MPa）。G6组的SBS（8.00±2.22MPa）明显高于其他激光照射组。
尽管与对照组相比，5W、250mJ/20Hz的Er:YAG激光照射在促进树脂复合材料与长石质瓷的粘结方面有效，但它不能作为HF酸的安全替代方法。本研究中评估参数的激光照射不能在瓷表面促进有效的粘结以形成足够用于临床的粘结。
