Article
Chemistry, Physical
Sebastian Buerklein, David Donnermeyer, Tim Julian Hentschel, Edgar Schaefer
Summary: This study evaluated the performance of five rotary nickel-titanium instruments in preparing curved root canals. The results showed that all instruments performed well, with Jizai instruments exhibiting the best shaping ability and minimal adjustments to canal curvature.
Review
Dentistry, Oral Surgery & Medicine
Jale Tanalp
Summary: This article discusses the extrusion of debris and irrigants during root canal treatment and evaluates the research methods and experimental models used to study this phenomenon. The review highlights the importance of minimizing tissue damage by developing new techniques and models, and emphasizes the need for more reliable conclusions through improved study designs.
INTERNATIONAL ENDODONTIC JOURNAL
(2022)
Article
Dentistry, Oral Surgery & Medicine
Emmanuel J. N. L. Silva, Jorge N. R. Martins, Natasha C. Ajuz, Henrique dos Santos Antunes, Victor Talarico Leal Vieira, Francisco Manuel Braz-Fernandes, Felipe Goncalves Belladonna, Marco Aurelio Versiani
Summary: This study aimed to compare 3 reciprocating systems in terms of design, metallurgy, mechanical properties, and shaping ability. The results showed that although there were differences in design, temperature transition phases, and mechanical behavior parameters among the tested instruments, they were similar in terms of shaping ability.
CLINICAL ORAL INVESTIGATIONS
(2023)
Article
Dentistry, Oral Surgery & Medicine
Andrea F. Campello, Marilia F. Marceliano-Alves, Jose F. Siqueira, Simone C. Fonseca, Ricardo T. Lopes, Flavio R. F. Alves
Summary: This study compared the amount of unprepared wall surface areas and accumulated hard tissue debris after root canal preparation using reciprocating or rotary instruments. The results showed some differences between the two instruments at different preparation sizes, and also observed a certain number of dentinal crack formations.
CLINICAL ORAL INVESTIGATIONS
(2021)
Article
Dentistry, Oral Surgery & Medicine
Dongsheng Yu, Li Guo, Jing Gao, Jie Liu, Deqin Yang
Summary: Curved root canals pose challenges in cleaning, shaping, and filling. Postoperative complications are caused by apical extrusion of debris and root canal transportation. This study aims to comprehensively evaluate the differences in these factors among different NiTi files.
Article
Dentistry, Oral Surgery & Medicine
Naji Kharouf, Eugenio Pedu, Walid Nehme, Kadour Akarma, Adrien Mercey, Catherine Isabe, Youssef Haikel, Davide Mancino
Summary: The study found that the cross section of the instrument may be the main parameter influencing the amount of apical debris extrusion, and the irrigation volume used during the shaping procedure can also affect the amount of apical debris extrusion to some extent.
JOURNAL OF ENDODONTICS
(2022)
Article
Dentistry, Oral Surgery & Medicine
Mary S. H. Lam, Jeffrey W. W. Chang, Gary S. P. Cheung
Summary: This study compared two reciprocating NiTi systems operated by novices in curved root canals and found that both systems left similar amounts of un-instrumented canal wall, and resulted in similar extent of canal transportation. The majority of canals were transported towards the isthmus or furcation aspect, with remaining dentine wall thinnest at the furcal aspect near the middle root region.
CLINICAL ORAL INVESTIGATIONS
(2021)
Article
Dentistry, Oral Surgery & Medicine
J. C. L. G. D. Martins, B. P. Oliveira, D. A. Duarte, A. C. D. Antonino, C. M. Aguiar, A. C. Camara
Summary: The study compared microcrack formation in extracted teeth roots after preparation of straight and curved root canals using hand, rotary, and reciprocating files, and found no significant difference in microcrack formation between the different file systems used.
INTERNATIONAL ENDODONTIC JOURNAL
(2021)
Article
Dentistry, Oral Surgery & Medicine
Eugenio Pedulla, Naji Kharouf, Simone Caruso, Giusy Rita Maria La Rosa, Hamdi Jmal, Youssef Haikel, Davide Mancino
Summary: This study aimed to evaluate the torsional, dynamic, and static cyclic fatigue resistance of different endodontic instruments. Results showed that One RECI had the highest cyclic fatigue resistance and rotation angle among the tested instruments. WaveOne Gold exhibited good torsional resistance. In the dynamic tests, One RECI and WaveOne Gold had longer fatigue time compared to One Curve and ProTaper Next X2.
JOURNAL OF ENDODONTICS
(2022)
Article
Chemistry, Physical
Maria Richert, Rafal Hubicki, Piotr Lebkowski
Summary: This study investigates the structure refinement of aluminum and its alloys through reciprocating extrusion. It reveals that the primary mechanism for hardening is the propagation of shear bands, and that structure renewal processes transform the formed micro and nano volumes into grains with large misorientation angles. The research also shows that higher metal purity leads to stronger structure renewal processes.
Article
Dentistry, Oral Surgery & Medicine
Isabela G. Guedes, Renata C. Rodrigues, Marilia F. Marceliano-Alves, Flavio R. F. Alves, Isabela N. Rocas, Jose F. Siqueira
Summary: This study compared the shaping ability of four new reciprocating and rotary nickel-titanium instruments, with triangular or S-shaped cross-section, in the mesial canals of mandibular molars. The results showed that they performed equally in shaping the canals.
INTERNATIONAL ENDODONTIC JOURNAL
(2022)
Article
Medicine, General & Internal
Qing Sheng, Wen LI, Yijun Yu, Hanxiao Liu, Xinyi Qiu, Bijun Zhu, Xuna Tang, Leiying Miao
Summary: The aim of this study was to evaluate the apical extrusion of debris, apical transportation, and centering ratio after root canal preparation using different instruments. The results showed that ProTaper Next and Revo-S prepared more centered root canal shapes, while all instruments caused debris extrusion through the apex.
ACTA MEDICA MEDITERRANEA
(2022)
Article
Dentistry, Oral Surgery & Medicine
Natasa Predin Djuric, Peet Van der Vyver, Martin Vorster, Zunaid Ismail Vally
Summary: In this study, it was found that the clockwise reciprocation groups showed less apical debris extrusion during canal preparation, while WaveOne Gold displayed higher extrusion amounts. Therefore, when choosing a file system, the impact on apical debris extrusion should be considered.
AUSTRALIAN ENDODONTIC JOURNAL
(2021)
Article
Multidisciplinary Sciences
Elif Ciftcioglu, Ali Keles, Gozde Akbal Dincer, Melis Oya Ates, Enver Sedat Kucukay
Summary: This study aimed to compare the shaping abilities of OneReci and WOG systems and evaluate the effect of increased apical enlargement on preparation quality. The results showed that both systems performed similarly and safely in the size 25 instrument preparation stage, but using a size 35 instrument in the WOG system resulted in significantly higher dentin removal, volume increase, and prepared surface area. The differences in canal transportation and centering ratio were not significant.
Article
Dentistry, Oral Surgery & Medicine
Taher M. N. Al Omari, Giusy Rita Maria La Rosa, Rami Haitham Issa Albanna, Abedelmalek Tabnjh, Flavia Papale, Eugenio Pedulla
Summary: This study compared the amount of extruded debris caused by different motions using a single-file system. The results showed that Jeni motion caused significantly less debris extrusion than TFA, REC, and CR, while there was no significant difference with OTR. The preparation time was similar among the tested motions.
Article
Dentistry, Oral Surgery & Medicine
Jina Koo, Sang Won Kwak, Hyeon-Cheol Kim
Summary: This study aimed to compare the setting times of epoxy resin-based and calcium silicate-based bioceramic sealers under different conditions. The results showed that calcium silicate-based sealers require moisture for setting, and lack of moisture significantly delays setting time.
JOURNAL OF DENTAL SCIENCES
(2023)
Article
Dentistry, Oral Surgery & Medicine
Jung -Hong Ha, Hyo-Jin Jo, Sang Won Kwak, Asgeir Sigurdsson, Hyeon-Cheol Kim
Summary: This study evaluated the effect of periodic changes in rotation speed on torsional stress and screw-in force using the dedicated alternative rotation technique (ART) motion of the EQ-M endodontic motor. The ART mode was found to reduce torsional stress and apical forces during instrumentation compared to continuous rotation.
JOURNAL OF ENDODONTICS
(2023)
Article
Dentistry, Oral Surgery & Medicine
Hyeon-Cheol Kim, Sang Won Kwak, Gary Shun-Pan Cheung
Summary: This article presents two cases of single-visit pulp revascularization for dens evaginatus and dens invaginatus, utilizing a protocol without intracanal medicaments or antibiotics. Both patients had complaints of pain and swelling, and radiographs showed open apex and periapical radiolucency, leading to the diagnosis of pulp necrosis and acute apical abscess or symptomatic apical periodontitis. The revascularization procedure was performed successfully without the use of specific intracanal medicaments, resulting in periapical healing and root dentin thickening.
AUSTRALIAN ENDODONTIC JOURNAL
(2023)
Editorial Material
Dentistry, Oral Surgery & Medicine
Francis Chan, Hyeon-Cheol Kim
AUSTRALIAN ENDODONTIC JOURNAL
(2023)
Article
Dentistry, Oral Surgery & Medicine
M. Chung, S. Lee, S. Kim, E. Kim
Summary: Previous studies have evaluated the effects of calcium silicate cements (CSCs) on normal dental pulp, but limited research has been done on inflamed pulp. This study aimed to investigate the inflammatory response and odontogenic differentiation of inflamed rat dental pulp after direct pulp capping with CSCs. The results showed that pulpal inflammation and incomplete dentine bridge formation were still present in most specimens at 4 weeks after pulp capping.
INTERNATIONAL ENDODONTIC JOURNAL
(2023)
Article
Dentistry, Oral Surgery & Medicine
Tan Firat Eyuboglu, Chun-Pin Lin, Hyeon-Cheol Kim
Summary: This study aimed to verify a reliable clinical test method by comparing pain intensity levels of a tooth at rest, during function, and after clinical tests. Postoperative pain levels during clinical tests and functions were significantly higher than at rest, with percussion tests resulting in significantly higher pain levels than function and chewing tests. The chewing strip method showed higher correlation in simulating pain intensity during function compared to the percussion method, indicating its potential as a more accurate assessment tool.
JOURNAL OF DENTAL SCIENCES
(2023)
Article
Dentistry, Oral Surgery & Medicine
Sang Won Kwak, Jina Koo, Minju Song, Il Ho Jang, Gianluca Gambarini, Hyeon-Cheol Kim
Summary: The aim of this study was to compare the physicochemical properties and biocompatibility between various calcium silicate-based bioceramic sealers (CSBSs) and the epoxy resin-based sealer AH Plus (AHP). The physical properties of CSBSs, including flow, setting time, radiopacity, dimensional stability, and pH, were evaluated according to the ISO 6876 standards. The biocompatibility of CSBSs was found to be higher than that of AHP, as assessed through cytotoxicity and cell attachment assays.
JOURNAL OF ENDODONTICS
(2023)
Article
Dentistry, Oral Surgery & Medicine
Nawar Naguib Nawar, Mostafa M. A. Elkholy, William Nguyen Ha, Shehabeldin Mohamed Saber, Hyeon-Cheol Kim
Summary: This study used finite element analysis (FEA) to investigate the effect of shaping parameters of middle mesial canals (MMCs) on the biomechanical behavior and life span of a mandibular first molar. The results showed that shaping the MMC reduced the number of cycles until failure (NCF). The shaping size of 30/.06 resulted in a lower life span percentage compared to 25/.04 in both independent and confluent MMC models. Oblique loading had a greater impact on NCF than vertical loading. Therefore, conservative shaping of the MMC as 25/.04 is recommended, and whether the MMC is independent or confluent determines the choice of increasing apical diameter or root canal taper when larger shaping parameters are needed.
JOURNAL OF ENDODONTICS
(2023)
Article
Chemistry, Physical
Rashid El Abed, Dana Al Raeesi, Aisha Alshehhi, Zuhair Alkhatib, Amar H. Khamis, Mohamed Jamal, Hyeon-Cheol Kim
Summary: This study aimed to assess the effect of mechanical loading and heating on the cyclic fatigue and torsional fracture resistances of heat-treated nickel-titanium files after usage and autoclaving. The results showed that autoclave sterilization did not improve the fracture resistance of the files, but used files had higher cyclic fatigue resistance compared to sterilized files. The torsional toughness and distortional angle were higher in new files compared to used and sterilized files.
Article
Dentistry, Oral Surgery & Medicine
Ahmed Elhakim, Junghwan Hwang, Sunil Kim, Euiseong Kim, Sumi Kang
Summary: This study compared the accuracy of traditional endodontic access and conservative access using novel guides. Experienced operators performed better in the free hand group, while the accuracy of conservative access prepared with the guides was consistently high. The results demonstrate that clinical experience and nonrestrictive guides contribute to accurate conservative access cavities.
AUSTRALIAN ENDODONTIC JOURNAL
(2023)
Article
Dentistry, Oral Surgery & Medicine
Ahmed Elhakim, Sunil Kim, Su-Jung Shin, Han-Sung Jung, Euiseong Kim
Summary: In this study, the authors investigated the effect of icariin on reducing root resorption and promoting functional healing of denuded roots in a rat model of tooth replantation. The results showed that icariin had a dose-dependent inhibitory effect on the differentiation of osteoclasts and enhanced osteogenic activity in stem cells. Micro-CT imaging and histological analysis confirmed the effectiveness of icariin in reducing root resorption and improving tooth retention and survival.
INTERNATIONAL ENDODONTIC JOURNAL
(2023)
Article
Dentistry, Oral Surgery & Medicine
Nawar Naguib Nawar, Roaa Abdelwahab Abdelfattah, Mohamed Kataia, Shehabeldin Mohamed Saber, Engy Medhat Kataia, Hyeon-Cheol Kim
Summary: This study investigates the effects of carious cavity and access on the fracture resistance of endodontically treated maxillary premolars using finite element analysis. The results show that a caries-driven access cavity has positive effects on the mechanical properties of maxillary premolars, but its impact on the biological aspect needs further assessment.
JOURNAL OF ENDODONTICS
(2023)
Article
Dentistry, Oral Surgery & Medicine
Minju Song, So-Mang Lee, Ji-Young Bang, Ruben H. Kim, Sang Won Kwak, Hyeon-Cheol Kim
Summary: This study evaluated the chemomechanical properties and biocompatibility of premixed putty-type bioactive ceramic cements. The results showed that these cements have comparable or even better properties compared to currently used cements, making them suitable for dental applications.
JOURNAL OF ENDODONTICS
(2023)
Article
Dentistry, Oral Surgery & Medicine
Dina Yehia Galal, Nawar Naguib Nawar, Mohammed abou El Seoud, Shehabeldin Mohamed Saber, Hyeon-Cheol Kim
Summary: This study investigated the effect of different access cavity designs on the biomechanical behavior and longevity of mandibular anteriors. The results showed that the facial and cervical access cavity designs provided considerable reinforcement to the endodontically treated mandibular incisors.
JOURNAL OF ENDODONTICS
(2023)
Article
Materials Science, Multidisciplinary
Jihye Hong, Sang Won Kwak, Jung-Hong Ha, Asgeir Sigurdsson, Ya Shen, Hyeon-Cheol Kim
Summary: This study compared the fatigue resistance of files made from different heat treatment methods and surface treatment. Four prototype files were created and tested, and it was found that the file that underwent a specific temperature heat treatment with titanium coating surface treatment showed the highest fatigue resistance.
