Safety and Effectiveness of Additional Apical Preparation using a Rotary Heat-treated Nickel–Titanium file with Larger Diameter and Minimum Taper in Retreatment of Curved Root Canals

Pinto, Jáder Camilo; Torres, Fernanda Ferrari Esteves; Santos-Junior, Airton Oliveira; Duarte, Marco Antônio Húngaro; Guerreiro-Tanomaru, Juliane Maria; Tanomaru‐Filho, Mário

doi:10.1055/s-0041-1723065

Cited by 8 publications

(13 citation statements)

References 37 publications

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“…Roggendorf et al also documented in their research, that enlarging canals by up to two sizes beyond the preretreatment dimension helped reduce the residual sealer amount. 18,19 In this study, further apical preparation was conducted using the ProTaper (F3 file). Following the initial retreatment procedure with ProTaper retreatment, the quantity of RFM was comparable among the groups, which is very likely due to the similar adhesive characteristics of the sealers.…”

Section: Discussionmentioning

confidence: 99%

Bioceramic and Resin-Based Sealers Removal Using XP-Endo Finisher: A Scanning Electron Microscopy Study

Fejjeri,

Salah,

Jaafoura

et al. 2024

European Journal of General Dentistry

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Objectives The aim of this study was to evaluate remaining filling materials of a bioceramic sealer (TotalFill BC sealer) and an epoxy resin sealer (AH Plus) after retreatment using a supplementary instrumentation (XP-endo Finisher). Materials and Methods Forty single-rooted teeth were selected for the study. The teeth were instrumented using ProTaper system and randomly divided into two groups (n = 20). Then they were obturated with either TotalFill BC/gutta-percha or AH Plus/gutta-percha using lateral compaction technique. Canals were retreated using ProTaper retreatment files and a solvent. The groups were subdivided (n = 10) according to the application or not of the XP-endo Finisher as a final step of retreatment. All roots were cleaved longitudinally and examined under scanning electron microscope to evaluate root canal filling remnants. A scoring system was utilized to quantify the amount of residual filling material at the three predetermined portions of each root canal.Statistical analysis was performed using IBM SPSS.25 with a significant value p < 0.05. Data were compared using the Mann–Whitney test and Kruskal–Wallis test. Results There was no statistically significant difference in the remaining filling materials for each third of the root canal after initial retreatment procedure between the TotalFill group and AH Plus group. Similar results were observed among the TotalFill groups with or without the application of XP-endo Finisher supplementary step. However, the remaining filling materials of AH Plus in the middle third of root canal were significantly less after the XP-endo Finisher application (p = 0.015). Conclusion No retreatment protocol tested in this study allowed the total elimination of root canal filling materials. The residual root canal filling materials is similar for the bioceramic and resinous sealers. The XP-endo Finisher is not effective in improving the removal of bioceramic root canal filling material while it is able to improve the removal of resinous cement.

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Section: Discussionmentioning

confidence: 99%

Bioceramic and Resin-Based Sealers Removal Using XP-Endo Finisher: A Scanning Electron Microscopy Study

Fejjeri,

Salah,

Jaafoura

et al. 2024

European Journal of General Dentistry

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“…28 In agreement, previous investigation showed the safety of this file during retreatments of curved canals since PDL 50/0.01 has high flexural strength and provides apical enlargement with no root canal transportation. 12 Curved root canals may favor the occurrence of apical transportation, zipping or crack formation during preparation, and retreatment procedures, with impair the treatment outcome. 2,29 Mesial root canals of mandibular molars with a curvature of 25 and 35 degrees were used in the present study representing moderate root curvatures.…”

Section: Discussionmentioning

confidence: 99%

“… 3 Thus, additional apical preparation using nickel–titanium (NiTi) instruments with large diameter and small taper has been proposed to improve the removal of remaining material in curved canals. 11 12 ProDesign Logic 50/0.01 (Easy Equipamentos Odontológicas, Belo Horizonte, Minas Gerais, Brazil) has diameter of 50 and a small taper of 0.01. This instrument significantly reduces the amount of filling material in the apical third of maxillary lateral incisors 11 and curved canals of mandibular molars.…”

Section: Introductionmentioning

confidence: 99%

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Effect of Additional Apical Preparation on Retreatment of Curved Root Canals Filled with Different Sealers

et al. 2022

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Objective This study assessed the influence of additional apical preparation on material removal during retreatment of curved root canals filled with different sealers. Materials and Methods Twelve mesial roots of mandibular molars with two separate canals and curvature between 25 and 35 degrees were selected. The working length was established 1-mm short of the apical foramen, and all the root canals were prepared using ProDesign R (PDR) 25/0.06. After preparation, the root canals were divided in two groups (n = 12) and filled by continuous wave condensation technique with NeoMTA Plus or AH Plus. All the root canals were retreated using rotary ProDesign Logic RT 25/0.08, reciprocating PDR 25/0.06 and apical preparation with PDR 35/0.05. Additional apical preparation was performed with ProDesign Logic (PDL) 50/0.01. The samples were scanned using a Skycan 1176 micro–computed tomography (micro-CT), voxel size 8.74 µm, before and after the retreatment procedures. Percentages of remaining filling material were evaluated. Statistical Analysis The data were submitted to paired and unpaired t-tests (α = 0.05). Results Percentage of remaining filling material was similar between the root canals filled with NeoMTA Plus or AH Plus sealer after retreatment using PDR 35/0.05, and after additional apical preparation using PDL 50/0.01 (p > 0.05). However, PDL 50/0.01 significantly decreased the percentage of remaining filling material in the apical third after the additional apical preparation for both sealers (p < 0.05). Conclusion NeoMTA Plus or AH Plus did not influence the retreatment of curved root canals. ProDesign Logic 50/0.01 promoted greater filling material removal in the apical third.

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“…20 Any instrument that is designed to minimize the contact area that exists between the instrument and the root dentinal walls is sure to decrease the vertical load on it. 21 This could explain the low fracture incidence with Kedo-S Square file system, as the diameter of the file is 0.28 mm with a dual cross-sectional area (triangular cross-section at apical region and teardrop cross-section at coronal region) and has variably variable taper.…”

Section: Discussionmentioning

confidence: 99%

Fracture Incidence of Kedo-S Square Pediatric Rotary Files: A Prospective Clinical Study

et al. 2021

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Objective The primary focus of this clinical study was to analyze the probability of occurrence of instrument fracture after root canal preparation of primary molars with the help of Kedo-S Square pediatric rotary file. Materials and Methods Three experienced specialists treated 100 primary maxillary and mandibular molars (335 root canals) using a standardized protocol over 2 months. Biomechanical preparations were carried out using Kedo-S Square file, as per the suggestions given by the manufacturer. Every instrument in Group A helped handle three clinical cases, while for groups B, C and D, they helped in handling 5, 9, and 12 cases, respectively. Making use of an operational microscope, the rotary files, after being pulled out from the canal, were observed. The values were tabulated, and descriptive statistics were performed. Results There were two fractures (2%), of which 1 occurred in group C in the apical 1/3rd of distobuccal canal of maxillary molar, and the other occurred in group D in the apical 1/3rd of mesiobuccal canal of maxillary molar. Conclusions The fracture rate of Kedo-S Square rotary file is quite low. It is primarily in the buccal canals of the maxillary molars and the apical third of the root canal that the instrument has a greater probability of separation.

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Safety and Effectiveness of Additional Apical Preparation using a Rotary Heat-treated Nickel–Titanium file with Larger Diameter and Minimum Taper in Retreatment of Curved Root Canals

Cited by 8 publications

References 37 publications

Bioceramic and Resin-Based Sealers Removal Using XP-Endo Finisher: A Scanning Electron Microscopy Study

Bioceramic and Resin-Based Sealers Removal Using XP-Endo Finisher: A Scanning Electron Microscopy Study

Effect of Additional Apical Preparation on Retreatment of Curved Root Canals Filled with Different Sealers

Fracture Incidence of Kedo-S Square Pediatric Rotary Files: A Prospective Clinical Study

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