Comparative analysis of torsional and cyclic fatigue resistance of ProGlider, WaveOne Gold Glider, and TruNatomy Glider in simulated curved canal

Dias Pedro de Souza,Kato Augusto Shoji,Bueno Carlos Eduardo da Silveira,Vivan Rodrigo Ricci,Duarte Marco Antonio Hungaro,Calefi Pedro Henrique Souza,Pelegrine Rina Andréa 대한치과보존학회 2023 Restorative Dentistry & Endodontics Vol.48 No.1

Objectives This study aimed to compare the torsional and cyclic fatigue resistance of ProGlider (PG), WaveOne Gold Glider (WGG), and TruNatomy Glider (TNG). Materials and Methods A total of 15 instruments of each glide path system (n = 15) were used for each test. A custom-made device simulating an angle of 90° and a radius of 5 millimeters was used to assess cyclic fatigue resistance, with calculation of number of cycles to failure. Torsional fatigue resistance was assessed by maximum torque and angle of rotation. Fractured instruments were examined by scanning electron microscopy (SEM). Data were analyzed with Shapiro-Wilk and Kruskal-Wallis tests, and the significance level was set at 5%. Results The WGG group showed greater cyclic fatigue resistance than the PG and TNG groups (p < 0.05). In the torsional fatigue test, the TNG group showed a higher angle of rotation, followed by the PG and WGG groups (p < 0.05). The TNG group was superior to the PG group in torsional resistance (p < 0.05). SEM analysis revealed ductile morphology, typical of the 2 fracture modes: cyclic fatigue and torsional fatigue. Conclusions Reciprocating WGG instruments showed greater cyclic fatigue resistance, while TNG instruments were better in torsional fatigue resistance. The significance of these findings lies in the identification of the instruments’ clinical applicability to guide the choice of the most appropriate instrument and enable the clinician to provide a more predictable glide path preparation.

Comparison of limited- and large-volume cone-beam computed tomography using a small voxel size for detecting isthmuses in mandibular molars

de Souza Tolentino, Elen,Andres Amoroso-Silva, Pablo,Alcalde, Murilo Priori,Yamashita, Fernanda Chiguti,Iwaki, Lilian Cristina Vessoni,Rubira-Bullen, Izabel Regina Fischer,Duarte, Marco Antonio Hungar Korean Academy of Oral and Maxillofacial Radiology 2021 Imaging Science in Dentistry Vol.51 No.1

Purpose: This study was performed to compare the ability of limited- and large-volume cone-beam computed tomography (CBCT) to display isthmuses in the apical root canals of mandibular molars. Materials and Methods: Forty human mandibular first molars with isthmuses in the apical 3 mm of mesial roots were scanned by micro-computed tomography (micro-CT), and their thickness, area, and length were recorded. The samples were examined using 2 CBCT systems, using the smallest voxels and field of view available for each device. The Mann-Whitney, Friedman, and Dunn multiple comparison tests were performed (α=0.05). Results: The 3D Accuitomo 170 and i-Cat devices detected 77.5% and 75.0% of isthmuses, respectively (P>0.05). For length measurements, there were significant differences between micro-CT and both 3D Accuitomo 170 and i-Cat(P<0.05). Conclusion: Both CBCT systems performed similarly and did not detect isthmuses in the apical third in some cases. CBCT still does not equal the performance of micro-CT in isthmus detection, but it is nonetheless a valuable tool in endodontic practice.

Correlation between Echocardiographic Pulmonary Artery Pressure Estimates and Right Heart Catheterization Measurement in Liver Transplant Candidates

Fuad Habash,Pooja Gurram,Ahmed Almomani,Andres Duarte,Abdul Hakeem,Srikanth Vallurupalli,Sabha Bhatti 한국심초음파학회 2018 Journal of Cardiovascular Imaging (J Cardiovasc Im Vol.26 No.2

BACKGROUND: Patients undergoing liver transplant have worse outcomes in the presence ofpulmonary hypertension. Correlation between echocardiography and catheterization derivedpressures in this population is not well studied. Our study's aim is to show the relationshipbetween pulmonary artery systolic pressure derived from transthoracic echo (ePASP) withpulmonary artery systolic pressure measured during right heart catheterization (cPASP). METHODS: Single center retrospective study, patients being evaluated for liver transplant(n = 31) who had an interpretable Doppler signal for ePASP and had right heart catheterization(RHC) measurements within 3 months constituted the study group. Control group (n = 49)consisted of patients who did not have liver disease. RESULTS: There was modest correlation between ePASP and cPASP (R = 0.58, p < 0.001) in LTcandidates (n = 31) compared with the control group (R = 0.74, p < 0.001, n = 49). The 95%limits of agreement by Bland-Altman analysis ranged from +33.6 mmHg to −21.7 mmHg. Using receiver operating characteristic analysis, ePASP cut-off > 47 mmHg was 59% sensitiveand 78% specific to diagnose pulmonary artery (PA) hypertension (mean PA pressure > 25mmHg) in the LT candidates, while a similar cutoff performed well in the control group(cutoff > 43 mmHg, n = 47, 91% sensitive, 100% specific). CONCLUSIONS: Compared with other disease states, ePASP correlates modestly with cPASPin patients with advanced liver disease. A higher ePASP cutoff should be used to screen forpulmonary hypertension. A multi-center prospective study with simultaneous transthoracicechocardiography and RHC measurements is required to determine the best cut-off in thispopulation.

Nonsurgical endodontic retreatment of fused teeth with transposition: a case report

Miguel Agostinho Beco Pinto Cardoso,Rita Brandao Noites,Miguel Andre Duarte Martins,Manuel Pedro da Fonseca Paulo 대한치과보존학회 2016 Restorative Dentistry & Endodontics Vol.41 No.2

Tooth transposition is a disorder in which a permanent tooth develops and erupts in the normal position of another permanent tooth. Fusion and gemination are developmental disturbances presenting as the union of teeth. This article reports the nonsurgical retreatment of a very rare case of fused teeth with transposition. A patient was referred for endodontic treatment of her maxillary left first molar in the position of the first premolar, which was adjacent to it on the distobuccal side. Orthopantomography and periapical radiography showed two crowns sharing the same root, with a root canal treatment and an associated periapical lesion. Tooth fusion with transposition of a maxillary molar and a premolar was diagnosed. Nonsurgical endodontic retreatment was performed. At four yr follow-up, the tooth was asymptomatic and the radiolucency around the apical region had decreased, showing the success of our intervention. The diagnosis and treatment of fused teeth require special attention. The canal system should be carefully explored to obtain a full understanding of the anatomy, allowing it to be fully cleaned and obturated. Thermoplastic techniques were useful in obtaining hermetic obturation. A correct anatomical evaluation improves the set of treatment options under consideration, leading to a higher likelihood of esthetically and functionally successful treatment.

Nonsurgical endodontic retreatment of fused teeth with transposition: a case report

Cardoso, Miguel Agostinho Beco Pinto,Noites, Rita Brandao,Martins, Miguel Andre Duarte,Paulo, Manuel Pedro da Fonseca The Korean Academy of Conservative Dentistry 2016 Restorative Dentistry & Endodontics Vol.41 No.2

Tooth transposition is a disorder in which a permanent tooth develops and erupts in the normal position of another permanent tooth. Fusion and gemination are developmental disturbances presenting as the union of teeth. This article reports the nonsurgical retreatment of a very rare case of fused teeth with transposition. A patient was referred for endodontic treatment of her maxillary left first molar in the position of the first premolar, which was adjacent to it on the distobuccal side. Orthopantomography and periapical radiography showed two crowns sharing the same root, with a root canal treatment and an associated periapical lesion. Tooth fusion with transposition of a maxillary molar and a premolar was diagnosed. Nonsurgical endodontic retreatment was performed. At four yr follow-up, the tooth was asymptomatic and the radiolucency around the apical region had decreased, showing the success of our intervention. The diagnosis and treatment of fused teeth require special attention. The canal system should be carefully explored to obtain a full understanding of the anatomy, allowing it to be fully cleaned and obturated. Thermoplastic techniques were useful in obtaining hermetic obturation. A correct anatomical evaluation improves the set of treatment options under consideration, leading to a higher likelihood of esthetically and functionally successful treatment.