Characterization of the differential efficacy of austenitic vs martensitic NiTi rotary files in non-surgical root canal retreatment: a micro-CT analysis

Abstract This study aimed to evaluate the efficacy of three sonic irrigation systems for removal of calcium hydroxide dressing from the apical root canal. A total of 96 single-rooted teeth in three categories of root canal curvatures (straight: 0–5⁰, moderate: 6–20⁰, and severe: > 20⁰ were allocated to four groups: conventional needle irrigation, EndoActivator, EQ-S, and Vibringe. The root canals were instrumented using Protaper NEXT and filled with calcium hydroxide. After removal of calcium hydroxide, the remaining volume of calcium hydroxide was measured by micro-CT analysis. Data were compared among root canal curvatures and irrigation systems using the Kruskal-Wallis test and Mann-Whitney test (p < .05). The oscillating range of each irrigation system was measured using light-coupled motion tracking. The volumes of calcium hydroxide remained in the canals of severe curvature were significantly lower than in those of straight curvature (p < .05). In the canals of moderate or severe curvature, EQ-S showed the highest removal percentage, followed by EndoActivator, Vibringe, and needle irrigation (p < .05). Light-coupled tracking showed the largest oscillating range in EQ-S (p < .05). Sonically activated irrigation systems with a flexible tip can be beneficial for cleaning of intracanal medication in the curved apical canals.

Download Full-text

A micro-computed tomographic (micro-CT) analysis of the root canal morphology of maxillary third molar teeth

Annals of Anatomy - Anatomischer Anzeiger ◽

10.1016/j.aanat.2017.09.003 ◽

2018 ◽

Vol 215 ◽

pp. 83-92 ◽

Cited By ~ 7

Author(s):

Iwona M. Tomaszewska ◽

Bartosz Leszczyński ◽

Andrzej Wróbel ◽

Tomasz Gładysz ◽

Hal F. Duncan

Keyword(s):

Root Canal ◽

Third Molar ◽

Micro Ct ◽

Computed Tomographic ◽

Maxillary Third Molar ◽

Ct Analysis ◽

Molar Teeth ◽

Root Canal Morphology ◽

Canal Morphology

Download Full-text

Occurence of dentinal defects after root canal preparation with R-phase, M-Wire and Gold Wire instruments: a micro-CT analysis

BMC Oral Health ◽

10.1186/s12903-017-0387-0 ◽

2017 ◽

Vol 17 (1) ◽

Cited By ~ 7

Author(s):

Marcely Cassimiro ◽

Kaline Romeiro ◽

Luciana Gominho ◽

Andressa de Almeida ◽

Larissa Costa ◽

...

Keyword(s):

Root Canal ◽

Gold Wire ◽

Micro Ct ◽

Root Canal Preparation ◽

Ct Analysis

Download Full-text

Influence of voxel size on micro-CT analysis of debris after root canal preparation

Brazilian Oral Research ◽

10.1590/1807-3107bor-2021.vol35.0008 ◽

2021 ◽

Vol 35 ◽

Author(s):

Jáder Camilo Pinto ◽

Fernanda Ferrari Esteves Torres ◽

Airton Oliveira Santos Junior ◽

Karina Ines Medina Carita Tavares ◽

Juliane Maria Guerreiro-Tanomaru ◽

...

Keyword(s):

Root Canal ◽

Micro Ct ◽

Root Canal Preparation ◽

Voxel Size ◽

Ct Analysis

Download Full-text

Evaluation of Three Ni-Ti Systems in Retreatment of Curved Root Canals Obturated by Gutta-Percha With iRoot SP

10.21203/rs.3.rs-258140/v1 ◽

2021 ◽

Author(s):

Yi Chen ◽

Weiping Tian ◽

Lisha Wang ◽

Fan Qi ◽

Mengyu Sun ◽

...

Keyword(s):

Root Canal ◽

Filling Material ◽

Micro Ct ◽

Imaging Data ◽

Root Canals ◽

Filling Materials ◽

Gutta Percha ◽

Group I ◽

Root Canal Retreatment ◽

Curved Root Canals

Abstract Background To evaluate the retreatability of curved root canals obturated with gutta-percha (GP) and iRoot SP using three different Ni-Ti systems through micro-computed tomographic (micro-CT) analysis. Methods A total of 51 curved root canals of permanent molars with angles of curvature ranging from 20° to 40° were used. The root canals were prepared with the ProTaper Next (PTN) rotary system to size 25, .06 taper and filled with iRoot SP and GP using the single cone technique. Samples were randomly divided into three groups (n = 17 each) according to the retreatment system used: Group I. ProTaper Universal Retreatment (PTR) system + ProTaper Next system up to PTN X2; Group II. Waveone Gold (WOG) system (WOG25); Group III. Reciproc Blue (RB) system (RB25). The ability to regain apical patency, the volume of residual filling material, and dentinal microcrack were assessed using micro-CT imaging. Data were analyzed statistically using two-way analysis of variance and chi-square test with a significance level of 5%. Results There were no significant differences among the systems tested in the reestablishment of apical patency and reduction of filling materials (P > 0.05), but RB system exhibited better reestablishment root canal ability in the upper portion of curvature and the reduction of filling materials in the apical third (P < 0.05). Intergroup analysis indicated that PTR system induced significantly more dentinal microcracks than other two systems (P < 0.05). Conclusions All three tested Ni-Ti instruments showed the similar retreatability of curved root canals obturated with gutta-percha and iRoot SP. RB system may be more effective and safer in curved root canal retreatment.

Download Full-text

Marginal gaps and internal voids after root-end filling using three calcium silicate-based materials: A Micro-CT analysis

Brazilian Dental Journal ◽

10.1590/0103-6440202104096 ◽

2021 ◽

Vol 32 (4) ◽

pp. 1-7

Author(s):

Alexander Pompermayer Jardine ◽

Ketsia Fernanda Váz Rosa ◽

Felipe Barros Matoso ◽

Ramiro Martins Quintana ◽

Renata Grazziotin-Soares ◽

...

Keyword(s):

Root Canal ◽

Calcium Silicate ◽

Statistical Difference ◽

Root Canal Treatment ◽

Ct Scans ◽

Micro Ct ◽

Air Entrapment ◽

Cavity Preparation ◽

Ct Analysis

Abstract This study evaluated the 3D quality of root-end filling, assessing the presence (volume and percentage) of marginal gaps and internal voids formed after retro-filling with three calcium silicate-based materials: MTA Angelus (Angelus Soluçoes Odontologicas, Londrina, PR, Brazil), Biodentine (Septodont Ltd., Saint Maur-des-Faussés, France) and Neo MTA Plus (Avalon Biomed Inc., Bradenton, Florida, US). Thirty human, extracted, single rooted teeth were used. Orthograde root canal treatment, root resection (3mm shorter than the apex) and retrograde cavity preparation with ultrasonic tips were performed. Teeth were divided into 3 groups (n =10 each) following a stratified randomization according to the initial volume of the root-end cavity. After retrofilling, samples were stored for 7 days. Then, two rounds of micro-CT scans were performed: soon after root-end preparation (with the cavity still empty) and 7 days after root-end filling. Marginal gaps, internal voids volume (mm3 and %), as well as, the overall defects (sum of gaps and voids) were evaluated. Statistics compared the three groups in relation to those defects. There was not statistical difference between groups regarding the marginal gaps (P≥ 0.05), the internal voids (P≥ 0.05), and the overall defects (P≥ 0.05). Median (mm3) and % of overall air-entrapment defects (gaps and/or voids) was: 0.004mm3 and 1.749% for MTA Angelus, 0.018mm3 and 6.660% for Biodentine, and 0.012mm3 and 4.079% for Neo MTA Plus. All materials had gaps and/or voids. No differences were found between MTA Angelus, Biodentine and Neo MTA Plus.

Download Full-text

Micro-CT analysis of dentinal microcracks on root canals filled with a bioceramic sealer and retreated with reciprocating instruments

Scientific Reports ◽

10.1038/s41598-020-71989-6 ◽

2020 ◽

Vol 10 (1) ◽

Author(s):

Andressa Almeida ◽

Kaline Romeiro ◽

Marcely Cassimiro ◽

Luciana Gominho ◽

Eugênia Dantas ◽

...

Keyword(s):

Root Canal ◽

Material Removal ◽

Filling Material ◽

Micro Ct ◽

Root Canal Filling ◽

Root Canals ◽

Type Iv ◽

Ct Analysis ◽

Ah Plus ◽

Reciprocating Instruments

Abstract This study aimed to analyze the potential occurrence of dentinal defects after the removal of a root canal filling with two different sealers using Reciproc (RC) or Reciproc Blue (RB). The mesial roots of 60 mandibular molars with a Vertucci type IV configuration were selected. The samples were initially instrumented with Reciproc (R25) and then divided into the following four experimental groups according to the endodontic sealer and retreatment instrument (n = 15): BC Sealer/Reciproc (BCRC); BC Sealer/Reciproc Blue (BCRB); AH Plus/Reciproc (AHRC); and AH Plus/Reciproc Blue (AHRB). Then, the samples were scanned under micro-CT after obturation and removal of the filling material. Two analyses were conducted. First, an evaluation was performed on all the axial images, and another analysis evaluated each millimeter of the 10 mm from the apex. Dentinal defects were observed in all the samples. All of the identified defects in the images after filling material removal were present in the corresponding images after obturation. The use of AH Plus and EndoSequence BC Sealer, and filling material removal using RC and RB instruments did not induce dentinal defects.

Download Full-text