Deficiencies in Root Canal Fillings Subsequent to Adaptive Instrumentation of Oval Canals

Abstract

The purpose of this study was to explore the influence of instrumentation and the potential for debris deposition using XP-endo shaper plus (XP-SP) and full-sequence SAF (F-SAF) on the adaption of thermoplastic root canal fillings in oval canals. Following the manufacturer’s instructions, ninety human permanent mandibular incisors with a single oval canal 6 mm from the apex (verified using pre-operative CBCT scanning) were instrumented with XP-SP and F-SAF. Obtura III Max apparatus was used for root canal obturation without the use of a root canal sealer. The roots were then sectioned 6 mm from the apex and examined with a digital stereomicroscope at x25 magnification to assess the root canal fillings. The F-SAF was associated with a significantly higher (p < 0.01) percentage of entire adaptation of the root fillings (76%) compared to the XP-SP (57%). Furthermore, the XP-SP group was also associated with higher (p < 0.01) defective obturation with debris at 17% and with voids at 26%. However, the F-SAF had lower percentages of defective obturations (7% with debris and 17% with voids). The quality of obturation of oval canals instrumented using full-sequence SAF was better.

Can Type of Instrumentation and Activation of the Final Irrigant Improve the Obturation Quality in Oval Root Canals? A Push-Out Bond Strength Study

“…Recently, other new types of instruments were introduced, which were specially designed to address the shaping and cleaning of oval canals, such as the XP-endo shaper and XP-endo finisher [ 26 , 27 , 28 , 29 , 30 ]. It will be of interest to test the effect of these instruments on the bond strength of root canal fillings in oval canals, nevertheless, such comparison was beyond the scope of the present study.…”

Extrusion of Sodium Hypochlorite in Oval-Shaped Canals: A Comparative Study of the Potential of Four Final Agitation Approaches Employing Agarose-Embedded Mandibular First Premolars

“…This is because traditional rotary instrumentation usually prepares a round cross-sectional shape, which results in disproportionate dentin removal, with some regions receiving considerable dentin removal while others receive none. Research has indicated that the effectiveness of irrigation strategies in oval-shaped canals can differ based on the irrigant type, irrigation volume and pressure, and activation methodology [18][19][20]. Considering oval root canals have a larger surface area and a more irregular form, which might alter the flow and distribution of irrigation solutions, using oval-shaped teeth in a study on irrigation techniques is crucial.…”

“…Considering oval root canals have a larger surface area and a more irregular form, which might alter the flow and distribution of irrigation solutions, using oval-shaped teeth in a study on irrigation techniques is crucial. A better understanding can be gained of how well various irrigation strategies work to remove pathogens, debris, and necrotic tissue from difficult canals by using oval-shaped teeth in studies [18][19][20][21][22].…”