Pavarina A C, Machado A L, Giampaolo E T, Vergani C E
Department of Removable Prosthodontics, São Paulo State University (UNESP), Araraquara Dental School, Araraquara, SP, Brazil.
J Oral Rehabil. 2003 Nov;30(11):1085-9. doi: 10.1046/j.1365-2842.2003.01150.x.
The disinfection of dental prostheses by immersion in a chemical solution should be capable of rapid inactivation of pathogenic microorganisms, without causing any adverse effect on the denture base resins. This study evaluated the effect of disinfection immersion on the transverse strength of two heat-cured resins. The denture base resins (Lucitone 550 and QC 20) were polymerized according to the manufacturers' instructions. After polymerization, the specimens were polished, and then stored in water at 37 degrees C for 50 +/- 2 h prior immersion in one of the following solutions for 10 min: 4% chlorhexidine, 1% sodium hypochlorite and 3.78% sodium perborate. The specimens were submitted to disinfection twice, simulating when dentures come from the patient and before being returned to the patient. Ten specimens were made for each group. The transverse strength was evaluated by a 3-point bend test. The flexural strength of the two denture base acrylic resins evaluated remained unaffected after immersion in the three solutions evaluated. In general, the QC 20 resin specimens exhibited lower transverse strength than the Lucitone 550 resin specimens, regardless of immersion solutions.
通过浸泡在化学溶液中来对牙科修复体进行消毒，应能够迅速灭活致病微生物，同时不会对义齿基托树脂造成任何不良影响。本研究评估了消毒浸泡对两种热固化树脂横向强度的影响。义齿基托树脂（Lucitone 550和QC 20）按照制造商的说明进行聚合。聚合后，将试样抛光，然后在37摄氏度的水中储存50±2小时，再浸泡在以下溶液之一中10分钟：4%洗必泰、1%次氯酸钠和3.78%过硼酸钠。对试样进行两次消毒，模拟义齿从患者处取出时以及归还患者之前的情况。每组制作10个试样。通过三点弯曲试验评估横向强度。在浸泡于所评估的三种溶液后，所评估的两种义齿基托丙烯酸树脂的弯曲强度均未受到影响。总体而言，无论浸泡在哪种溶液中，QC 20树脂试样的横向强度均低于Lucitone 550树脂试样。
