INTRODUCTION:The aim of this study was to evaluate the effect of the order of preparation of four-canal maxillary molars on volume variation, instrument deformation, cyclic fatigue, and preparation time by using the WaveOne Gold Primary (WOG 25.07). METHODS:We selected 48 permanent, human, four-canal maxillary molars. The teeth were divided into 4 groups according to the order of initiation of the canal preparation sequence: (1) mesiobuccal (MB), distobuccal (DB), palatal (P), second mesiobuccal (MB2); (2) DB-P-MB2-MB; (3) P-MB2-MB-DB and (4) MB2-MB-DB-P. Pre- and post-preparation microtomography scanning was performed to obtain initial and final canal volume measurements. The instruments were also evaluated by using scanning electron microscopy to determine the wear and deformation present after use. The active instrumentation time was also recorded. The data were statistically compared by using a significance level of 5%. RESULTS:No statistically significant difference was found between groups for volume variation and time of preparation of the canals with the WOG system (P > .05); however, a statistically significant difference was observed in the deformation of the instruments. In the comparison between the groups for MB-DB-P-MB2 and P-MB2-MB-DB, the latter presented greater deformation of the instruments. CONCLUSIONS:Root canal preparation sequence affected deformation of the instruments but did not influence the volume variation or the canal preparation time with the WOG system. To minimize instrument deformation, the preparation order should be MB-DB-P-MB2.

译文

引言:本研究的目的是评估使用WaveOne Gold Primary(WOG 25.07)准备四管上颌磨牙的顺序对体积变化,器械变形,循环疲劳和准备时间的影响。
方法:我们选择了48个永久性人类四管上颌磨牙。根据根管准备顺序的开始顺序将牙齿分为4组:(1)中颊颊(MB),足颊(DB),pa(P),第二颊颊(MB2); (2)DB-P-MB2-MB; (3)P-MB2-MB-DB和(4)MB2-MB-DB-P。进行准备前和准备后显微断层扫描,以获得初始和最终的根管体积测量值。还通过使用扫描电子显微镜对仪器进行评估,以确定使用后存在的磨损和变形。活动的仪器时间也被记录下来。使用5%的显着性水平对数据进行统计学比较。
结果:两组之间在使用WOG系统进行运河的体积变化和准备时间方面没有发现统计学上的显着差异(P> .05);然而,在仪器的变形方面观察到统计学上的显着差异。在MB-DB-P-MB2和P-MB2-MB-DB的组之间进行比较时,后者呈现出更大的乐器变形。
结论:根管预备序列影响器械的变形,但不影响WOG系统的体积变化或根管准备时间。为了最大程度地减少仪器变形,准备顺序应为MB-DB-P-MB2。

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