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endodontic micro access

Brent Moore, Konstantinos Verdelis, Anil Kishen, Thuan Dao, Shimon Friedman
INTRODUCTION: Recently, we reported that in mandibular molars contracted endodontic cavities (CECs) improved fracture strength compared with traditional endodontic cavities (TECs) but compromised instrumentation efficacy in distal canals. This study assessed the impacts of CECs on instrumentation efficacy and axial strain responses in maxillary molars. METHODS: Eighteen extracted intact maxillary molars were imaged with micro-computed tomographic imaging (12-μm voxel), assigned to CEC or TEC groups (n = 9/group), and accessed accordingly...
December 2016: Journal of Endodontics
Samira Adnan, Farhan Raza Khan
OBJECTIVE: To compare mean micro-leakage around 3 types of temporary restorative materials in-vitro, when placed adjacent to permanent restorations (amalgam) in complex endodontic access cavities. STUDY DESIGN: Randomized controlled trial. PLACE AND DURATION OF STUDY: Dental Clinics, Dental Laboratory and Research Laboratory at The Aga Khan University Hospital, Karachi, from January to June 2014. METHODOLOGY: After random allocation of 60 teeth into 3 experimental groups, each group had conventional class II cavities prepared and amalgam placed...
March 2016: Journal of the College of Physicians and Surgeons—Pakistan: JCPSP
Noemi Bonessio, Ana Arias, Guiseppe Lomiento, Ove A Peters
The aim of this study was to investigate and compare, via finite element analysis (FEA), the effects of endodontic access and canal preparation on stress distribution under functional loading of a mandibular molar treated with novel (TRUShape) and conventional (Vortex) rotary root canal preparation instruments. Identical plastic mandibular molars with natural anatomy had all 4 canals shaped with either TRUShape or a conventional rotary, Vortex (#20 and #30, both by Dentsply Tulsa Dental). Finite element analysis was used to evaluate stress distribution in untreated and treated models...
February 5, 2016: Odontology
Jerome Michetti, Adrian Basarab, Michel Tran, Franck Diemer, Denis Kouame
Validation of image processing techniques such as endodontic segmentations in cone-beam computed tomography (CBCT) is a challenging issue because of the lack of ground truth in in vivo experiments. The purpose of our study was to design an artificial surrounding tissues phantom able to provide CBCT image quality of real extracted teeth, similar to in vivo conditions. Note that these extracted teeth could be previously scanned using micro computed tomography (μCT) to access true quantitative measurements of the root canal anatomy...
2015: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
Gabriele Edoardo Pecora, Camilla Nicole Pecora
There is an immense difference between tradizional Endodontic Surgery and Micro-Endo Surgery. Microsurgical techniques made possible and accessible results,that were unimaginable before. Under microscopic control,the operative techniques reached continous changes,allowing a better precision and quality standards. The dramatic evolution from Endo Surgery to Micro-Endo Surgery has enlarged the horizon of therapeutic options. Illumination and magnification through the Microscope has fundamentally and radically changed the way endo surgery can be performed...
January 2015: Journal of Conservative Dentistry: JCD
Alanna Junaid, Laila Gonzales Freire, Carlos Eduardo da Silveira Bueno, Isabel Mello, Rodrigo Sanches Cunha
INTRODUCTION: More information regarding the ability of single files to maintain the original canal position is required before adopting a single-file approach to cleaning and shaping. This study compares apical transportation in curved root canals when instrumenting with a single WaveOne (WO) file (Dentsply Tulsa Dental Specialties, Tulsa, OK) in a reciprocating motion with that incurred when using a sequence of Twisted Files (TFs; SybronEndo, Orange, CA) in a continuous rotating motion...
May 2014: Journal of Endodontics
Shahriar Shahi, Mohammad Samiei, Saeed Rahimi, Hossein Nezami
INTRODUCTION: The purpose of this in vitro study was to compare the coronal seal of four temporary filling materials, Coltosol, Zonalin, Zamherir, and Intermediate Restorative Material (IRM) by the India ink dye penetration test. MATERIALS AND METHODS: Endodontic access preparations were prepared in 120 extracted intact human premolars. The teeth were randomly divided into six groups including four experimental and two control groups. The access cavities in each group were sealed with Coltosol, Zonalin, Zamherir, and IRM; subsequently thermocycling was applied for 5-55˚C for 150 cycles...
2010: Iranian Endodontic Journal
Denise Lins de Sousa, Rebecca Bastos Rocha Araújo de Sousa, Daniela Nunes Pinto, José Jeová Siebra Moreira Neto, Cibele Barreto Mano de Carvalho, Paulo César de Almeida
PURPOSE: This study's purposes were to: evaluate the antibacterial effect of chemomechanical instrumentation and a calcium hydroxide-based dressing in primary teeth with pulp necrosis secondary to trauma; and detect the presence of Fusobacterium nucleatum and black-pigmented rods in the canals of these teeth. METHODS: Microbiological sample collections (MSCs) were obtained: after coronal access to the canals of primary incisors (in 18 teeth; MSC 1); after chemomechanical instrumentation (in 10 teeth; MSC 2); and 72 hours after removal of intracanal medication (in 18 teeth; MSC 3)...
July 2011: Pediatric Dentistry
J Kovac, D Kovac
The primary goal of endodontic therapy is the reduction or elimination of micro-organisms and their by-products from the root canal system. Although a number of instrumentation and irrigation techniques exist, debris is often left behind in the root canal system, therefore proper canal cleaning, shaping and irrigation is essential to significantly reduce and sometimes eliminate bacteria from canals. However, complete elimination of bacteria is not always achieved in clinical practice due to the anatomical complexities of root canals and consequent limitations of access by instruments and irrigators, the use of antimicrobial medication has been advocated to disinfect the root canal system and because root tissues are closely related to the periodontal apparatus...
2011: Bratislavské Lekárske Listy
A F Fouad
Pulp regeneration is considered in cases where the dental pulp has been destroyed because of microbial irritation. Diverse oral and food-borne micro-organisms are able to invade the pulp space, form biofilm on canal walls, and infiltrate dentinal tubules. Prior to pulp regeneration procedures, the pulp space and dentinal walls need to be sufficiently disinfected to allow for and promote regeneration. The necessary level of disinfection is likely higher than that accepted for traditional endodontic therapy, because in traditional techniques the mere lowering of bacterial loads and prevention of bacterial access to periapical tissues is conducive to healing...
July 2011: Advances in Dental Research
S Suebnukarn, R Hataidechadusadee, N Suwannasri, N Suprasert, P Rhienmora, P Haddawy
AIM: To evaluate the effectiveness of haptic virtual reality (VR) simulator training using microcomputed tomography (micro-CT) tooth models on minimizing procedural errors in endodontic access preparation. METHODOLOGY: Fourth year dental students underwent a pre-training assessment of access cavity preparation on an extracted maxillary molar tooth mounted on a phantom head. Students were then randomized to training on either the micro-CT tooth models with a haptic VR simulator (n = 16) or extracted teeth in a phantom head (n = 16) training environments for 3 days, after which the assessment was repeated...
November 2011: International Endodontic Journal
Françoise Tilotta, Philippe Brousseau, Elise Lepareur, Kazutoyo Yasukawa, Philippe de Mazancourt
Extracting dental DNA for identification purposes is usually performed after crushing the tooth. The main disadvantage of this method is that the tooth is completely destroyed so further radiographic, anatomical or biochemical studies are no longer possible. We compared the quantities of DNA obtained by crushing the tooth and by removing pulp by standard endodontic access with trepanation of the occlusal surface and amplified DNA micro-satellites. In the series of crushed teeth, insufficient material for amplification was obtained in 78% of cases and a complete profile was obtained in only 9% of cases...
October 10, 2010: Forensic Science International
O H Ikram, S Patel, S Sauro, F Mannocci
AIM: To compare the volume of hard tooth tissue lost after caries removal, access cavity preparation, root canal preparation, fibre post space and cast post preparation in carious premolar teeth. The null hypothesis tested was that there is no difference between the volumes of hard tooth tissue lost expressed as a percentage of the preoperative hard tooth tissue volume, after each operative procedure. METHODOLOGY: Twelve extracted human premolars with mesial or distal carious cavities penetrating into the pulp chamber were selected...
December 2009: International Endodontic Journal
Pascal Magne, Derek T Tan
PURPOSE: New methods are available for the rapid generation of 3-D finite element models of dental structures and restorations. Validation of these methods are required. The aim of the present study is to utilize stereolithography and surface-driven automatic meshing to generate models of specific restorative conditions, and to examine these models under loading. The data generated are compared to existing experimental data in an attempt to validate the model. MATERIALS AND METHODS: An intact maxillary central incisor was digitized with a micro-CT scanner...
February 2008: Journal of Adhesive Dentistry
A L Jensen, P V Abbott, J Castro Salgado
One of the main aims of endodontic treatment is to eliminate micro-organisms from within the root canal system. A further aim is to prevent the ingress of any further bacteria during and after treatment. These aims are usually achieved by various means and stages throughout the treatment process. Endodontic treatment is usually performed on teeth that have lost the integrity of the external coronal tooth structure which has allowed bacteria to enter the tooth and ultimately reach the pulp space. Further opening of the tooth occurs when an endodontic access cavity is made to allow treatment to be performed...
March 2007: Australian Dental Journal
Jong-Ki Lee, Byung-Hyun Ha, Jeong-Ho Choi, Seok-Mo Heo, Hiran Perinpanayagam
In endodontic therapy, access and instrumentation are strongly affected by root canal curvature. However, the few studies that have actually measured curvature are mostly from two-dimensional radiographs. The purpose of this study was to measure the three-dimensional (3D) canal curvature in maxillary first molars using micro-computed tomography (microCT) and mathematical modeling. Extracted maxillary first molars (46) were scanned by microCT (502 image slices/tooth, 1024 X 1024 pixels, voxel size of 19.5 x 19...
October 2006: Journal of Endodontics
Pascal Magne
OBJECTIVES: This investigation describes a rapid method for the generation of finite element models of dental structures and restorations. METHODS: An intact mandibular molar was digitized with a micro-CT scanner. Surface contours of enamel and dentin were fitted following tooth segmentation based on pixel density using an interactive medical image control system. Stereolithography (STL) files of enamel and dentin surfaces were then remeshed to reduce mesh density and imported in a rapid prototyping software, where Boolean operations were used to assure the interfacial mesh congruence (dentinoenamel junction) and simulate different cavity preparations (MO/MOD preparations, endodontic access) and restorations (feldspathic porcelain and composite resin inlays)...
May 2007: Dental Materials: Official Publication of the Academy of Dental Materials
P S Fleming, J Dermody
Endodontic retreatment has been proven less effective than conventional root treatment. Factors dictating this include difficulty in accessing the root canal system in retreatment cases, problems in negotiating a highly resistant micro flora and unfavourable anatomy. Patients should, therefore, be counselled on the possibility of failure necessitating surgical procedures and possibly extraction. However, despite these mitigating factors success is still a realistic goal in the majority of cases.
2003: Journal of the Irish Dental Association
L B Peters, A J van Winkelhoff, J F Buijs, P R Wesselink
AIM: The aim of this study was to evaluate the fate of microorganisms in root canals of teeth with infected pulps and periapical bone lesions with and without the use of calcium hydroxide medication. METHODOLOGY: Endodontic samples were cultured and microorganisms were counted and identified in 43 teeth before (sample 1) and after (sample 2) treatment during the first visit and before (sample 3) and after (sample 4) treatment during the second visit. In the first visit teeth were instrumented and half of the teeth were filled with a thick slurry of calcium hydroxide in sterile saline...
January 2002: International Endodontic Journal
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