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Cangül Keskin, Murat Demiral, Evren Sarıyılmaz
Objectives: The present study aimed to evaluate the shaping ability of 2 thermally treated nickel-titanium reciprocating systems in simulated curved canals. Materials and Methods: Forty simulated canals were prepared to apical size 25 using Reciproc Blue R25 (VDW) and WaveOne Gold Primary (Dentsply Sirona) instruments. Standard pre- and post-preparation images were taken and superimposed. The removal of resin material was measured at 5 standard points: the canal orifice, halfway between the canal orifice and the beginning of the curve, the beginning of the curve, the apex of the curve, and the end-point of the simulated canal...
May 2018: Restorative Dentistry & Endodontics
N Hofmann
OBJECTIVES: To determine the shaping ability of reciprocating files without/with post-manufacturing heat treatment (Reciproc®/Reciproc blue®, VDW) when used by six operators of similar level of experience. MATERIALS AND METHODS: Plastic training blocs with curved root canals (5 mm radius, 55° angle) were mounted in a dental manikin. Each operator prepared six specimens with each instrument system using the file sizes R25, R40 and R50 consecutively. Specimens were photographed, and deviations from the centre of the canal were measured at intervals of 0...
May 12, 2018: Clinical Oral Investigations
Cangul Keskin, Evren Sarıyılmaz, Murat Demiral
Background. The present study aimed to compare the shaping ability of Reciproc Blue instruments with or without the creation of a glide path in simulated S-shaped root canals. Methods. Root canals of thirty #15.02 clear resin S-shaped blocks were dyed using ink and photographed. Then the blocks were randomly divided into 2 groups: group A: Reciproc Blue with glide path created with ProGlider and group B: Reciproc Blue with no glide path preparation (n=15). The blocks were also photographed after preparation...
2018: Journal of Dental Research, Dental Clinics, Dental Prospects
Emmanuel João Nogueira Leal Silva, Victor Talarico Leal Vieira, Tanize Theresinha Gonçalves Gabina, Henrique Dos Santos Antunes, Hélio Pereira Lopes, Gustavo De-Deus
OBJECTIVES: To evaluate the cyclic fatigue resistance of Reciproc M-Wire R25 (VDW, Munich, Germany) and Reciproc R25 Blue instruments (VDW) driven by Direct® (VDW) contra-angle connected to an ordinary an air-driven motor or an electric motor and compare the results with those obtained by the Reciproc M-Wire R25 or Reciproc Blue R25 instruments driven by an electric torque-controlled motor using "RECIPROC ALL" preset program. MATERIALS AND METHODS: Thirty Reciproc M-Wire R25 (25/0...
May 3, 2018: Clinical Oral Investigations
Douglas P Landsittel, Larry Kessler, Christopher H Schmid, Paul Marantz, Maria E Suarez-Almazor
A number of publications have discussed approaches to training the scientific workforce in comparative effectiveness research (CER) and patient-centered outcomes research (PCOR). To meet this need, funders have offered resources for developing educational materials and establishing training programs. To extend these efforts into specific researcher communities, the Agency for Healthcare Research and Quality developed an R25 Funding Opportunity Announcement that called for basic, advanced, and experiential training for a specific researcher community in collaboration with associated program partners...
October 2017: Journal of Clinical and Translational Science
Mohammad Reza Nabavizadeh, Mahdi Sedigh-Shams, Sara Abdolrasoulnia
Introduction: This study aimed to evaluate the cyclic fatigue resistance of two single file engine-driven instruments, Reciproc and NeoNiTi, in simulated root canals. Methods and Materials: Two groups of 15 NiTi endodontic instruments with an identical tip size of 0.25 mm were tested: Reciproc R25 (group A) and NeoNiTi A1 (group B). Cyclic fatigue testing was performed in a stainless steel artificial canal. The simulated canals had a 60° angle and 5-mm radius curvature...
2018: Iranian Endodontic Journal
Emmanuel João Nogueira Leal Silva, Fernanda Hecksher, Henrique Dos Santos Antunes, Gustavo De-Deus, Carlos Nelson Elias, Victor Talarico Leal Vieira
INTRODUCTION: The aim of the present study was to evaluate the influence of blue thermal treatment on the torsional resistance behavior of M-Wire Reciproc files (VDW, Munich, Germany). METHODS: Ten M-Wire Reciproc R25 (25/0.08v) and 10 Reciproc Blue R25 (25/0.08v, VDW) instruments were used. The torque and angle of rotation at failure of new instruments (n = 10) were measured according to ISO 3630-1. Three millimeters of each instrument tip was clamped to a small load cell by a lever arm linked to the torsion axis...
April 18, 2018: Journal of Endodontics
Taha Özyürek, Gülşah Uslu, Koray Yılmaz, Mustafa Gündoğar
INTRODUCTION: The purpose of this article was to compare the cyclic fatigue resistance of Reciproc and Reciproc Blue files (VDW GmbH, Munich, Germany) that were used to prepare root canals of mandibular molar teeth with or without a glide path. METHODS: Sixty Reciproc R25 and 60 Reciproc Blue R25 files were used. The Reciproc and Reciproc Blue groups were divided into 3 subgroups (ie, as received condition, used without a glide path, and used with a glide path)...
April 18, 2018: Journal of Endodontics
Yanhua Liu, Dongjuan Yuan, Zexin Zhao, Dongming Lan, Bo Yang, Yonghua Wang
Penicillium camembertii (PCL), a mono- and di-acylglycerol lipase (DGL), has the vital potential in the oil chemistry for food industry. However, known DGLs are mesophilic enzymes which restricts its application in the industry. To improve thermostability of PCL, we used amino acid substitution by comparison of amino acids compositions of PCL and protein sequences from typical thermophilic bacteria. Then, some conservative residues around active center were avoided to mutate according to homologous alignment analyses...
April 18, 2018: Biochemical and Biophysical Research Communications
Yuanyuan Ren, Xin Liu, Runqing Geng, Qunwei Lu, Rong Rao, Xi Tan, Xiangliang Yang, Wei Liu
As one of the most widely used nanomaterials, the safety of nano-TiO₂ for human beings has raised concern in recent years. Sialylation is an important glycosylation modification that plays a critical role in signal transduction, apoptosis, and tumor metastasis. The aim of this work was to investigate the cytotoxicity and phototoxicity of nano-TiO₂ with different crystalline phases for human skin keratinocytes (HaCaT cells) under ultraviolet (UV) irradiation and detect sialic acid alterations. The results showed that the mixture of crystalline P25 had the highest cytotoxicity and phototoxicity, followed by pure anatase A25, whereas pure rutile R25 had the lowest cytotoxicity and phototoxicity...
April 19, 2018: Nanomaterials
P Xie, X P Wan, Z Bu, E J Diao, D Q Gong, X T Zou
The present study was conducted to determine the changes in concentrations of hormones and growth factors and their related receptor gene expressions in crop tissue, relative organ weight, and serum biochemical parameters in male and female pigeons during incubation and chick-rearing periods under artificial farming conditions. Seventy-eight pairs of 60-week-old White King pigeons with 2 fertile eggs per pair were randomly divided into 13 groups by different breeding stages. Serum prolactin and insulin-like growth factor-1 (IGF-1) concentrations in crop tissue homogenates were the highest in both male and female pigeons at 1 d of chick-rearing (R1), while epidermal growth factor (EGF) in female pigeons peaked at d 17 of incubation (I17) (P < 0...
March 15, 2018: Poultry Science
Connie L Parks, Keith L Monson
This study employed an automated facial recognition system as a means of objectively evaluating biometric correspondence between a ReFace facial approximation and the computed tomography (CT) derived ground truth skin surface of the same individual. High rates of biometric correspondence were observed, irrespective of rank class (Rk ) or demographic cohort examined. Overall, 48% of the test subjects' ReFace approximation probes (n=96) were matched to his or her corresponding ground truth skin surface image at R1 , a rank indicating a high degree of biometric correspondence and a potential positive identification...
May 2018: Forensic Science International
Abbas Mesgarani, Mahmoud Reza Hamidi, Sina Haghanifar, Shabnam Naiemi, Ali Bijani
Background: Apical transportation (AT) of the root canal moves the physiologic canal terminus to a new location on the external root surface and results in the accumulation of debris and residual microorganisms due to inadequate cleaning and shaping of the canal end. This study aimed to assess the prevalence of AT following canal preparation with Mtwo and Reciproc R25 using cone-beam computed tomographic (CBCT). Materials and Methods: In this in vitro study, 40 mesiobuccal root canals of the maxillary molars with 19-22 mm length and (>40°) taper were prepared in two groups using Mtwo and Reciproc R25 rotary systems along with irrigation with 2...
January 2018: Dental Research Journal
Emmanuel João Nogueira Leal Silva, Felipe Gonçalves Belladonna, Marianna Fernandes Carapiá, Brenda Leite Muniz, Mariana Santoro Rocha, Edson Jorge Lima Moreira
Objectives: This study evaluated the amount of remaining root canal filling materials after retreatment procedures performed by undergraduate students using manual, rotary, and reciprocating techniques through micro-computed tomographic analysis. The incidence of instrument fracture and the instrumentation time were also evaluated. Materials and Methods: Thirty maxillary single rooted teeth were prepared with Reciproc R25 files and filled with gutta-percha and AH Plus sealer by the continuous wave of condensation technique...
February 2018: Restorative Dentistry & Endodontics
P Neelakantan, K Khan, K Y Li, H Shetty, W Xi
AIM: To examine the efficacy of a novel supplementary irrigant agitating brush (Finisher GF Brush, MedicNRG, Kibbutz Afikim, Israel) on the debridement of root canals prepared with a novel stainless steel rotary instrumentation system (Gentlefile; MedicNRG), or nickel titanium rotary instruments in oval root canals. METHODOLOGY: Mandibular premolars (n = 72) were selected and divided randomly into three experimental groups (n = 24) after microCT scanning: group 1, canal preparation to rotary NiTi size 20, ...
January 24, 2018: International Endodontic Journal
Ezgi Doganay Yildiz, Hakan Arslan, Meltem Sumbullu, Ibrahim Sevki Bayrakdar, Muhammed Akif Sumbullu, Ertugrul Karatas
Aim: This study aims to evaluate the root canal transportation, centering ability, and instrumentation times after root canal preparation using reciprocating motion at 300 rotations per minute (rpm) and 600 rpm. Materials and Methods: Twenty mesial root canals of mandibular first molars with curvature angles of 35°-70° and radii of 2-6 mm were included in the study. Root canal instrumentation was performed using R25 according to the manufacturer's instructions at 300 rpm or 600 rpm ( n = 10)...
July 2017: Journal of Conservative Dentistry: JCD
Hakan Arslan, Ezgi Doganay Yildiz, Hicran Ates Gunduz, Meltem Sumbullu, Ibrahim Sevki Bayrakdar, Ertugrul Karatas, Muhammed Akif Sumbullu
Aim: The aim of this study is to evaluate the root canal transportation, centering ability, and instrumentation times with the ProTaper Gold (Dentsply Tulsa Dental, Tulsa, OK, USA), Reciproc (VDW, Munich, Germany), and ProTaper Universal (Dentsply Maillefer, Ballaigues, Switzerland) using cone-beam computed tomography (CBCT). Materials and Methods: Thirty mesial root canals of mandibular first molars with curvature angles of 35°-70° and radii of 2-6 mm were included in the study...
July 2017: Journal of Conservative Dentistry: JCD
Murilo Priori Alcalde, Marco Antonio Hungaro Duarte, Clovis Monteiro Bramante, Bruno Carvalho de Vasconselos, Mario Tanomaru-Filho, Juliane Maria Guerreiro-Tanomaru, Jader Camilo Pinto, Marcus Vinicius Reis Só, Rodrigo Ricci Vivan
OBJECTIVES: The aim of this study was to evaluate the cyclic and torsional fatigue resistance of the reciprocating single-file systems Reciproc Blue 25.08 (VDW GmbH, Munich, Germany), Prodesign R 25.06 (Easy Dental Equipment, Belo Horizonte, Brazil), and WaveOne Gold 25.07 (Dentsply/Tulsa Dental Specialties, Tulsa, OK, USA). MATERIALS AND METHODS: Sixty reciprocating instruments of the systems Reciproc Blue R25 (RB #25 .08 taper), Prodesign R (PDR #25 .06 taper), and WaveOne Gold (WOG #25 ...
December 9, 2017: Clinical Oral Investigations
Connie L Parks, Keith L Monson
This research examined how accurately 2D images (i.e., photographs) of 3D clay facial approximations were matched to corresponding photographs of the approximated individuals using an objective automated facial recognition system. Irrespective of search filter (i.e., blind, sex, or ancestry) or rank class (R1 , R10 , R25 , and R50 ) employed, few operationally informative results were observed. In only a single instance of 48 potential match opportunities was a clay approximation matched to a corresponding life photograph within the top 50 images (R50 ) of a candidate list, even with relatively small gallery sizes created from the application of search filters (e...
January 2018: Forensic Science International
Ali Keleş, Mahmoud Torabinejad, Cangül Keskin, Dongjin Sah, İsmail Uzun, Hatice Alçin
OBJECTIVE: The present study aims to compare two mineral trioxide aggregate (MTA) placement techniques, manual compaction and ultrasonic activation of manually compacted MTA, with warm vertical compaction (WVC) for orthograde obturation of mesial root canals of mandibular first molars showing Vertucci type II root canal configuration. MATERIALS AND METHODS: Thirty roots were selected according to their micro-CT scanned images. Root canals were chemomechanically prepared using Reciproc R25 and NaOCl using EndoVac...
November 25, 2017: Clinical Oral Investigations
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