■这项研究的目的是使用各种旋转仪器,例如GatesGlidden(GG)钻头,观察冠状扩张后牙根牙本质中裂纹的发生率,ProTaperUniversalSX,OneFlare,和HyFlex电火花。
■收集了70颗新拔除的单管磨牙。将所有牙齿随机分为五组,每组14颗(n=14),其中一组作为对照,其余四组进行了GG训练,ProTaperUniversalSX,OneFlare,和HyFlex电火花,分别。
■与ProTaperUniversalSX相比,GG钻头在牙根牙本质中产生更高的裂纹形成率(P<0.05),OneFlare,和HyFlexEDM仪器(P>0.05)。
■使用GG钻头导致更多的裂纹形成。然而,ProTaperUniversalSX的结果,OneFlare,和HyFlexEDM扩口仪器在裂纹形成方面较少。
UNASSIGNED: The aim of this study was to see the incidence of cracks in root dentin after coronal flaring using various rotary instruments such as Gates Glidden (GG) drills, ProTaper Universal SX, OneFlare, and HyFlex EDM.
UNASSIGNED: Seventy freshly extracted premolar teeth with single canal were collected. All the teeth were randomly divided into five groups of fourteen each (n = 14), of which one group served as the control and the rest of the four groups were instrumented with GG drills, ProTaper Universal SX, OneFlare, and HyFlex EDM, respectively.
UNASSIGNED: The GG drills resulted in a higher rate of crack formation in root dentin (P < 0.05) than the ProTaper Universal SX, OneFlare, and HyFlex EDM instruments (P > 0.05).
UNASSIGNED: The use of GG drills resulted in more crack formation. However, the results for the ProTaper Universal SX, OneFlare, and HyFlex EDM flaring instruments were less in terms of crack formation.