Mobarak Ahmed Moustafa, Ibrahim Yomna Mohamed, Abdelhakim Ahmed Adel, Arnabat-Dominguez Josep, El Backly Rania Mahmoud
Conservative Dentistry Department, Faculty of Dentistry, Alexandria University, Alexandria, Alexandria, Egypt.
Dental Biomaterials Department, Faculty of Dentistry, Alexandria University, Alexandria, Alexandria, Egypt.
Lasers Med Sci. 2025 Jan 31;40(1):57. doi: 10.1007/s10103-025-04310-4.
The purpose of this study was to compare the penetration of methylene blue (MB) dye after laser irradiation using PIPS (photon-induced photoacoustic streaming) and SWEEPS (shockwave enhanced emission photoacoustic streaming) methods compared to Passive ultrasonic irrigation (PUI) and to study their effect on dentin microhardness. A total of 44 single-rooted human teeth which were extracted for orthodontic or periodontal reasons were used. The teeth were decapitated to standardize roots to 12 mm in length. Canals were prepared up to size #30.6% and divided randomly into four groups (n = 11/group) according to the method of NaOCl activation: Group I: Er: YAG laser activation with PIPS tip; Group II: Er: YAG laser activation with SWEEPS tip; Group III: passive ultrasonic irrigation (PUI) and Group IV: conventional needle irrigation (CI). MB dye was injected then teeth were sectioned horizontally into coronal, middle and apical sections. Penetration depth/area percentages were measured using stereomicroscopy. Coronal specimens were further subjected to Vickers microhardness testing. Data were statistically analyzed. SWEEPS and PIPS activation methods provided higher dye penetration depth and area percentages compared to PUI with no statistically significant differences between all test groups. However, all test groups showed statistically significant differences with the CI (control) group. SWEEPS activation provided higher microhardness values with statistically significant differences with the other groups. Laser irrigant activation using PIPS and SWEEPS is comparable to PUI concerning MB dye penetration. However, SWEEPS preserved dentin microhardness significantly which can be beneficial for the long-term prognosis of root canal treated teeth.
本研究的目的是比较使用光子诱导光声流（PIPS）和冲击波增强发射光声流（SWEEPS）方法进行激光照射后亚甲蓝（MB）染料的渗透情况，并与被动超声冲洗（PUI）进行比较，同时研究它们对牙本质显微硬度的影响。总共使用了44颗因正畸或牙周原因拔除的单根人牙。将牙齿截冠，使牙根标准化为12毫米长。根管预备至30.6号，根据次氯酸钠激活方法随机分为四组（每组n = 11）：第一组：使用PIPS尖端的铒激光激活；第二组：使用SWEEPS尖端的铒激光激活；第三组：被动超声冲洗（PUI）；第四组：传统针管冲洗（CI）。注入MB染料后，将牙齿水平切成冠部、中部和根尖部切片。使用体视显微镜测量渗透深度/面积百分比。对冠部标本进一步进行维氏显微硬度测试。对数据进行统计学分析。与PUI相比，SWEEPS和PIPS激活方法提供了更高的染料渗透深度和面积百分比，所有测试组之间无统计学显著差异。然而，所有测试组与CI（对照组）相比均有统计学显著差异。SWEEPS激活提供了更高的显微硬度值，与其他组有统计学显著差异。就MB染料渗透而言，使用PIPS和SWEEPS的激光冲洗激活与PUI相当。然而，SWEEPS能显著保留牙本质显微硬度，这对根管治疗牙齿的长期预后可能有益。
