Root Canal Preparation and Enlargement Using Thermally Treated Nickel-Titanium Rotary Systems in Curved Canals

Pivoto-João, Mariana Mena Barreto; Tanomaru‐Filho, Mário; Pinto, Jáder Camilo; Espir, Camila Galletti; Guerreiro-Tanomaru, Juliane Maria

doi:10.1016/j.joen.2020.08.007

Cited by 7 publications

(10 citation statements)

References 31 publications

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“…The fi rst null hy pot hesis was accepted; the ProDesign Logic and HyFlex EDM systems provided similar results after preparation regarding transportation, volume, uninstrumented surface and debris. Previous studies have reported that these systems have similar capacity for preparation in mesial roots of mandibular molars 24 . HFEDM and PDL provided centralized preparations in canines, maxillary molars and mandibular molars with curvature.…”

Section: Discussionmentioning

confidence: 96%

“…22,23 PDL and HFEDM are capable of maintaining the preparation centralized in curved canals. 24 However, no instrumentation technique has been capable of preparing all the root canal walls. [25][26][27] The use of ultrasonic activation in the root canal preparation of flat and oval canals promoted greater reduction of uninstrumented surface.…”

Section: Introductionmentioning

confidence: 99%

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Diamond–coated ultrasonic tip decreases debris and uninstrumented surface after preparation of curved canals with isthmus

GIOSTER–RAMOS,

PIVOTO–JOÃO,

PINTO

et al. 2023

Braz. oral res.

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The aim of this study was to evaluate root canal preparation with nickel titanium rotary instruments and complementary preparation with ultrasonic tip in curved canals of mandibular molars with isthmus. Twenty-eight mesial roots of mandibular molars with curvature between 20° and 40° and presence of isthmus throughout the entire extension of the root canals were prepared using ProDesign Logic CM (PDL) up to size 40.05, or HyFlex EDM (HFEDM) up to size 40.04. Complementary preparation was performed in the isthmus region using the ultrasonic insert E18D (Helse, Istmo Diamantada). The root canals were scanned using micro-CT (SkyScan 1176) at 9 µm voxel size before and after each preparation step. Transportation, percentage of increase in volume, debris and uninstrumented surface (UNS) were evaluated. Mann Whitney, Wilcoxon, paired and non-paired t-tests were used for statistical analysis (α = 0.05). The canals prepared with PDL and HFEDM obtained similar results for all the variables assessed before using E18D (p > 0.05). E18D significantly decreased the percentage of debris and UNS values in both Groups (p < 0.05). The complementary preparations with E18D caused a smaller quantity of debris in the isthmus of the canals previously prepared with PDL in comparison with HFEDM (p < 0.05). PDL and HFEDM provided similar root canal preparation. PDL promoted a smaller quantity of Debris in the isthmus than HFEDM after using E18D. E18D significantly improved cleaning, and reduced Debris and UNS.

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Section: Discussionmentioning

confidence: 96%

Section: Introductionmentioning

confidence: 99%

Diamond–coated ultrasonic tip decreases debris and uninstrumented surface after preparation of curved canals with isthmus

GIOSTER–RAMOS,

PIVOTO–JOÃO,

PINTO

et al. 2023

Braz. oral res.

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“…Nevertheless, the use of larger apical preparation has been recommended to improve the effect of irrigating solution 22 , and to enhance root canal disinfection 23 . In addition, the current state-of-art of the heat-treated NiTi instruments, transversal sections and tapers results in safer root canal preparation of curved root canals 24 . The aforementioned statements justify the use of a larger apical preparation with the reciprocating NiTi file Reciproc Blue R40 in the present study.…”

Section: Discussionmentioning

confidence: 99%

Effect of foraminal enlargement on microcrack formation and apical transportation: a nano-CT assessment

Pinto

Vasconcelos

Leite

et al. 2023

Sci Rep

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The aim of this study was to evaluate the foraminal enlargement and its influence on microcrack formation and apical transportation in root canals with apical curvature. Eighteen maxillary lateral incisors with apical curvature were selected by using micro-CT images. Root canals were randomly divided in two groups (n = 9) according to root canal preparation using two working lengths: 1 mm short of the apical foramen (control group) and 1 mm beyond the apical foramen (foraminal enlargement). For both groups Reciproc Blue R40 was used for root canal instrumentation. Specimens were scanned by nano-CT (UniTOM HR) before and after root canal preparation. Percentage, length, and width of microcracks, and apical transportation were assessed. Kappa, chi‐square and McNemar tests were used for qualitative analyses while paired and unpaired t-test were used for quantitative analyses (α = 0.05). For both groups, rather similar and low percentages of microcracks were observed before root canal preparation (P > 0.05). The foraminal enlargement promoted new microcracks, not observed in the control group. An increase in microcrack length was observed when the foraminal enlargement was performed (P < 0.05). Higher apical transportation was observed when foraminal enlargement was performed (P < 0.05). Foraminal enlargement using a heat-treated reciprocating file size 40 promoted microcracks and higher apical transportation than root canal preparation up to 1 mm short of apical foramen.

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“…The present study showed an increase of approximately 14% in the apical third of the root canals after preparation with both systems. This apical enlargement promotes a lower percentage of non-instrumented surface and decreased debris [ 39 40 ]. Therefore, the small apical enlargement, promoted by both rotary NiTi systems in this study, may have overestimated the effect of the complementary protocol.…”

Section: Discussionmentioning

confidence: 99%

Combination of a new ultrasonic tip with rotary systems for the preparation of flattened root canals

et al. 2021

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Objectives This study evaluated 2 nickel-titanium rotary systems and a complementary protocol with an ultrasonic tip and a small-diameter instrument in flattened root canals. Materials and Methods Thirty-two human maxillary second premolars with flattened canals (buccolingual diameter ≥4 times larger than the mesiodistal diameter) at 9 mm from the radiographic apex were selected. The root canals were prepared by ProDesign Logic (PDL) 30/0.01 and 30/0.05 or Hyflex EDM (HEDM) 10/0.05 and 25/0.08 ( n = 16), followed by application of the Flatsonic ultrasonic tip in the cervical and middle thirds and a PDL 25/0.03 file in the apical third (FPDL). The teeth were scanned using micro-computed tomography before and after the procedures. The percentage of volume increase, debris, and uninstrumented surface area were analyzed using the Kruskal-Wallis, Dunn, Wilcoxon, analysis of variance/Tukey, and paired and unpaired t -tests (α = 0.05). Results No significant difference was found in the volume increase and uninstrumented surface area between PDL and HEDM ( p > 0.05). PDL had a higher percentage of debris than HEDM in the middle and apical thirds ( p < 0.05). The FPDL protocol resulted in less debris and uninstrumented surface area for PDL and HEDM ( p < 0.05). This protocol, with HEDM, reduced debris in the middle and apical thirds and uninstrumented surface area in the apical third ( p < 0.05). Conclusions High percentages of debris and uninstrumented surface area were observed after preparation of flattened root canals. The HEDM, Flatsonic tip, and 25/0.03 instrument protocol enhanced cleaning in flattened root canals.

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Root Canal Preparation and Enlargement Using Thermally Treated Nickel-Titanium Rotary Systems in Curved Canals

Cited by 7 publications

References 31 publications

Diamond–coated ultrasonic tip decreases debris and uninstrumented surface after preparation of curved canals with isthmus

Diamond–coated ultrasonic tip decreases debris and uninstrumented surface after preparation of curved canals with isthmus

Effect of foraminal enlargement on microcrack formation and apical transportation: a nano-CT assessment

Combination of a new ultrasonic tip with rotary systems for the preparation of flattened root canals

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