3-dimensional Ability Assessment in Removing Root Filling Material from Pair-matched Oval-shaped Canals Using Thermal-treated Instruments

De‐Deus, Gustavo; Belladonna, Felipe Gonçalves; Zuolo, Arthur de Siqueira; Cavalcante, Daniele Moreira; Carvalho, Marco Simões; Marinho, Alessandra; Souza, Erick Miranda; Lopes, Ricardo Tadeu; Silva, Emmanuel João Nogueira Leal

doi:10.1016/j.joen.2019.06.003

Cited by 38 publications

(30 citation statements)

References 25 publications

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“…31 Therefore, in the present study, root canals were prepared up to size 25/.06 and were enlarged up to size 35/.05 during retreatment. However, corroborating previous investigations, 11,13,18 the present study showed a considerable percentage of filling material inside the root canals, with a mean of 9.87% and 8.92% in the cervical/ middle and apical thirds, respectively. The first null hypothesis was rejected, since the PDL 50/.01 instruments reduced 56.35% of the remaining filling material in the apical third of the curved mesial root canals of lower molars.…”

Section: Discussionsupporting

confidence: 93%

“…5,6 Controlled memory (CM) heat treatment promotes an NiTi alloy martensitic phase at room temperature, 7 providing greater flexibility and resistance to cyclic fatigue, 8 thus enabling apical enlargement in curved root canals. 9 Although mechanized NiTi instruments have been used in endodontic retreatments because of their safety 10 and effectiveness in removing filling materials, [11][12][13][14] these materials cannot be fully removed from the root canal, [15][16][17][18][19][20][21][22] especially in the apical third of curved root canals. 23 Apical enlargement can improve removal of filling materials 13 ; however, an increase in the apical preparation of curved root canals using instruments with larger diameter may result in excessive dentin removal.…”

mentioning

confidence: 99%

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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

et al. 2021

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Objective The aim of this study was to investigate the effect of additional apical preparation using the ProDesign Logic (PDL) 50/.01 rotary heat-treated nickel–titanium (NiTi) file with a larger diameter and minimal taper for retreatment of curved root canals. Materials and Methods Mesial curved root canals of 12 mandibular molars were prepared using PDL 25/.06 and filled using the continuous wave of condensation technique and AH Plus sealer. After retreatment using ProDesign S (PDS) 25/.08, PDL 25/.06 and PDL 35/05, a complementary procedure was performed with PDL 50/.01. Microcomputed tomography (micro-CT) scanning was performed before and after retreatment procedures. The cyclic fatigue resistance of unused PDS 25/.08, PDL 25/.06, PDL 35/.05 and PDL 50/.01 instruments (n = 12) was evaluated in a stainless-steel device. Statistical Analysis Data on the volumes of the root canals and the remaining filling materials were submitted to the paired t-test. Cyclic fatigue resistance data was submitted to one-way ANOVA and Tukey’s tests (α = 0.05). Results Use of PDL 50/.01 decreased the remaining filling materials in the apical third (p < 0.05). The root canal volume was similar in the cervical and middle thirds before and after preparation using PDL 50/.01 (p > 0.05). PDL 50/.01 presented the highest cyclic fatigue resistance (p < 0.05). Conclusions Use of the PDL 50/.01 instrument as an additional apical preparation for retreatment of curved root canals improved filling material removal in the apical third, while maintaining the dentin in the cervical and middle thirds. In addition, PDL 50/.01 presented high-flexural resistance.

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Section: Discussionsupporting

confidence: 93%

mentioning

confidence: 99%

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

et al. 2021

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“…However, only three studies compared the Reciproc and RB systems. Two of these indicated similar efficacy of Reciproc and RB (De‐Deus et al 2019a, b). The third study reported superior retreatment ability of the Reciproc file (Bago et al 2019).…”

Section: Discussionmentioning

confidence: 96%

“…To date, few studies have evaluated the additional steps of instrumentation using various adjustable instruments (Self‐adjusting File, ReDentNova, Berlin, Deutchland; XP‐endo Shaper and Finisher, FKG, La Chaux de Fonds, Switzerland; and TRUShape, Dentsply Sirona, Ballaigues, Switzerland). These studies show promising results on the usage of these instruments as an additional aid in the removal of apical filling material (Aksel et al 2019, Machado et al 2019, De‐Deus et al 2019b).…”

Section: Introductionmentioning

confidence: 99%

“…Although it has not yet been proven that complete removal of intracanal filling material is mandatory for better healing outcomes, it is reasonable to assume that filling remnants could allow the growth of bacteria biofilms on dentinal walls or inside dentinal tubules and thus prevent effective root canal irrigation and disinfection (Ng et al 2008). De‐Deus et al (2019a,b) investigated the influence of additional instrumentation with instrument of greater tip size on the removal of filling remnants after basic retreatment. The study reported that apical enlargement from size 0.25 to 0.40 mm improved the removal of filling materials in oval canals.…”

Section: Introductionmentioning

confidence: 99%

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Evaluation of filling material remnants after basic preparation, apical enlargement and final irrigation in retreatment of severely curved root canals in extracted teeth

Bago

Plotino²,

Katić

et al. 2020

Int Endodontic J

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Aim To compare the retreatment ability of several rotary and reciprocating file systems in curved root canals of extracted teeth and to evaluate the influence of additional apical enlargement performed after a basic retreatment on the amount of remaining filling material. Methodology A total of 65 round curved root canals were used. The root canals were prepared with the ProTaper Next rotary system to size 25, .06 taper and filled with an epoxy resin‐based sealer and gutta‐percha using continuous wave vertical compaction and warm injection back‐filling. The canals were randomly divided into four groups according to the retreatment system used: Group I. ProTaper Universal Retreatment system + ProTaper Gold (PTG) instrumentation system up to PTG F2; Group II. Reciproc Blue system up to the instrument RB25; Group III. Reciproc system up to the instrument R25; Group IV. Wave One Gold (WOG) system up to the instrument WOG25. After the basic retreatment, additional apical enlargement was performed in each group with an instrument that was one size larger: in Group I, II and III up to apical size 40, and in Group IV up to 35. The final irrigation protocol included the following: 15% ethylenediaminotetraacetic acid followed by NaOCl irrigation. The volume of filling material was measured using an industrial micro‐CT four times: after root canal filling (Volume I), after basic retreatment with size 25 files (Volume II), after additional root canal enlargement with larger instruments (Volume III), and after the final irrigation protocol (Volume IV). The decrease in the amount of filling material after each retreatment protocol was analysed using a Kruskal–Wallis test. Intergroup analyses were performed with a Kruskal–Wallis test and between‐group differences were further analysed with Mann–Whitney U test. Results There were no significant differences amongst the systems tested in the amount of remaining filling material, or the reduction rates after each phase of the retreatment procedures (P > 0.05). Intragroup analysis indicated that the use of a larger final instrument removed significantly more filling material in all groups (P < 0.001). Conclusion The four tested instrumentation systems were equally effective in removing filling materials from curved root canals in extracted teeth. Additional apical enlargement with larger files improved the removal of filling remnants after basic retreatment.

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Root Canal Filling Materials and Techniques

Chong

Chandler

2021

Endodontic Materials in Clinical Practice

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3-dimensional Ability Assessment in Removing Root Filling Material from Pair-matched Oval-shaped Canals Using Thermal-treated Instruments

Cited by 38 publications

References 25 publications

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

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

Evaluation of filling material remnants after basic preparation, apical enlargement and final irrigation in retreatment of severely curved root canals in extracted teeth

Root Canal Filling Materials and Techniques

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