Dentinal defects before and after rotary root canal instrumentation with three different obturation techniques and two obturating materials

Abstract

Aim:To evaluate the role of rotary root canal instrumentation followed by obturation with three different techniques and two different materials on the incidence of dentinal defects.Materials and Methods:One hundred and sixty mandibular premolars were divided into eight groups (n = 20). Group I was left untreated and served as control. The other seven groups were prepared with profile rotary instruments till #40.06 taper. After preparation, group II was left unfilled, groups III, IV, and V were obturated with Gutta-percha and AH Plus sealer using passive technique, lateral compaction and warm vertical compaction, respectively. Groups VI, VII, and VIII were obturated with Resilon and Realseal sealer using passive technique, lateral compaction, and warm vertical compaction, respectively. Roots were then sectioned at 3, 6, and 9 mm from the apex and inspected under a stereomicroscope (50×) for dentinal defects. Chi-square test was performed to compare the incidence of dentinal defects between the groups (P < 0.05).Results:The unprepared control group had no dentinal defects. The instrumentation group (group II) and the obturation group (groups III-VIII) showed significantly more defects than the uninstrumented control group (group I) (P < 0.001). There was no significant difference between the root canal obturating techniques (group III-VIII) when compared with the instrumentation group (group II). On inter group comparison among the obturation groups the number of defects after lateral compaction with Gutta-percha (group IV) was significantly larger than passive Gutta-percha obturation (group III) (P < 0.05).Conclusions:The results suggest that root canal instrumentation significantly influenced the incidence of dentinal defects or fracture. Dentinal defects were more significantly attributed to the role of root canal instrumentation rather than the type of obturation technique or material. Lateral compaction with Gutta-percha significantly produces more defects than passive Gutta-percha obturation.

Vertical Root Fracture initiation in curved roots after root canal preparation: A dentinal micro-crack analysis with LED transillumination

“…Those defects can lead to root fracture, and must be prevented ( 4 - 7 ). Micro-cracks produced during shaping procedures can propagate by occlusal forces with repeated stress application and finally result in root fractures ( 8 , 9 ). Canal micro-cracks originate inside the root canal, and may or may not reach the external root surface ( 10 ).…”

Influence of obturating techniques on root dentin crack propagation: A micro-computed tomography assessment

“…showed that that CLC and WVC resulted in more dentinal cracks than passive obturation techniques. [ 23 ] Similarly, Capar et al . observed that obturation techniques have a direct relationship with crack formation and found that lateral and continuous wave techniques lead to more crack generation than single cone technique.…”

Effect of three different rotary instrumentation systems on postinstrumentation pain: A randomized clinical trial

“…Moreover, it is known that root canal instrumentation significantly influenced the incidence of dentinal defects. [ 30 31 ] The higher incidence of cracks in ProTaper when compared to Mtwo in another study shows that there is a greater incidence of stress on root canal wall, resulting in higher incidence of cracks. [ 30 ] These defects may be caused by the stress generated during mechanical instrumentation.…”