Lu TC |
------>authors3_c= ------>paper_class1=1 ------>Impact_Factor=None ------>paper_class3=1 ------>paper_class2=1 ------>vol=7 ------>confirm_bywho=None ------>insert_bywho=weinan ------>Jurnal_Rank=None ------>authors4_c= ------>comm_author=1 ------>patent_EDate=None ------>authors5_c= ------>publish_day=1 ------>paper_class2Letter=None ------>page2=79 ------>medlineContent= ------>unit=000 ------>insert_date=20071008 ------>iam=2 ------>update_date=None ------>author=??? ------>change_event=1 ------>ISSN= ------>authors_c= ------>score=124 ------>journal_name=Chin Dent J ------>paper_name=Force decay of elastomeric chain. ------>confirm_date=None ------>tch_id=090069 ------>pmid=16214630 ------>page1=74 ------>fullAbstract=INTRODUCTION: The purpose of this study was to evaluate the effects of prestretching on time-dependant force decay of synthetic elastomeric chains. METHODS: Five-unit (12.5 mm) and 6-unit (15.5 mm) modules (Generation II, Ormco, Glendora, Calif) were prestretched 100% for 1 hour (n = 12), 24 hours (n = 12), 2 weeks (n = 12), and 4 weeks (n = 12) in 37 degrees C distilled water. The prestretched and unprestretched (control) modules were then stretched to 30 mm in 37 degrees C water, and their forces were measured at 0 hour, 1 hour, 24 hours, and weekly for 4 weeks with a digital force gauge. RESULTS: The prestretched 5- and 6-unit modules yielded significantly lower initial force than the controls. All 5- and 6-unit prestretched and control groups showed substantial force decay during the first hour. However, at 1 hour, similar remaining forces were found in the 5-unit prestretched and control groups (P > .05), and small differences were seen in the 6-unit groups. The rates and patterns of force decay from 1 hour to 4 weeks were quite similar between the control and the prestretched modules of both the 5- and 6-unit groups. CONCLUSIONS: The effects of prestretching on force decay of elastomeric chains were noted mainly in the first hour. Thus, the clinical value of prestretching a synthetic elastomeric chain is questionable. ------>tmu_sno=None ------>sno=16035 ------>authors2=Wang WN ------>authors3= ------>authors4= ------>authors5= ------>authors6= ------>authors6_c= ------>authors=Lu TC ------>delete_flag=0 ------>SCI_JNo=None ------>authors2_c= ------>publish_area=0 ------>updateTitle=Effects of prestretching on force degradation of synthetic elastomeric chains. ------>language=1 ------>check_flag=None ------>submit_date=None ------>country=NULL ------>no= ------>patent_SDate=None ------>update_bywho=None ------>publish_year=1988 ------>submit_flag=None ------>publish_month=6 |