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A Comparison Of Endodontic Root-End Filling Techniques: A Micro-Computed Tomography Analysis, Leslie P. Wolford

Graduate Theses, Dissertations, and Problem Reports

Introduction:

Researchers have compared the differences between hand compaction of root-end filling bioceramics with compaction of these materials by hand followed by ultrasonic activation (hand/ultrasonic compaction). Additionally, most of these researchers did not utilize Micro-Computed Tomography (Micro-CT) analysis. The purpose of this study is to evaluate total porosity volume of three different bioceramics when compacted by hand alone versus hand/ultrasonic compaction using Micro-CT Analysis.

Materials and methods:

Seventy-two human maxillary central incisors were selected for the study. All were subjected to orthograde endodontic treatment followed by root tip resection 3-mm from the apex at a 90° to the long axis …

The Incidence Of Root Canal Therapy Or Extraction After Orthodontic Treatment: A Ten-Year Retrospective Study, Thomas Korte

Master's Theses (2009 -)

INTRODUCTION: The impact of orthodontic treatment on anterior teeth specifically in relation to root canal therapy and extraction has not been previously described. The objective of this study was to evaluate the incidence of root canal therapy and extraction after orthodontic treatment in the anterior permanent dentition.Methods: We analyzed insurance claims and enrollment data for individuals enrolled with Delta Dental of Wisconsin from 2008 to 2017. A total of 63,720 teeth from 5310 patients who had Delta Dental insurance at age 10 were included in the study. The Cox Regression model was used to analyze the effect of the …

Influence Of Progressive Vs. Minimal Canal Preparations On The Fracture Resistance Of Mandibular Molars: A Finite Element Analysis, Michael Smoljan

Master's Theses (2009 -)

INTRODUCTION: Several file systems have been recently introduced with the objective of preserving coronal dentin. There is limited research comparing the role of canal shaping on preservation of pericervical dentin and its role in fracture resistance. The aim of this study is to investigate the effect of minimal canal taper on residual tooth strength and stress distribution after root canal treatment. Methods: Two pre-accessed mandibular molar TruTeeth (Acadental Endo 3DP, Lenexa, KS) were subject to simulated endodontic treatment in this study. One tooth was instrumented with ProTaper Gold (Dentsply, Tulsa, OK) to F2 (25/0.08v progressive taper) in the mesial canals …

Impact Of Delayed Completion Of Previously Initiated Therapy And Provider Type On Outcomes Of Root Canal Treatment, Igor Sulim

Master's Theses (2009 -)

Objective:if the provider type influences long-term outcomes in instances where NSRCT has been previously initiated. The primary purpose of this study was to determine if the period of time between previously initiated therapy and the completion of non-surgical root canal treatment (NSRCT) influences long-term outcomes. The secondary purpose of this study was to determineMaterials/Methods: Enrollment and claims data from Delta Dental of Wisconsin from2002-2014 was analyzed. Teeth that received NSRCT within 6 months after completionof pulpal debridement or pulpotomy procedures (identified by Codes of DentalProcedures and Nomenclature) and within a continuous insurance coverage period were …

Fracture Resistance Of Simulated External Cervical Resorption In Anterior Teeth Restored With And Without A Fiber Post., Michelle M. Romeo

Graduate Theses, Dissertations, and Problem Reports

Introduction: External cervical resorption (ECR) is a destructive type of external resorption that can be difficult to treat. ECR usually begins subgingival at the cementoenamel junction of teeth and continues apically and circumferentially. This substantial loss of tooth structure may make these teeth more prone to fracture and should be addressed when treatment planning teeth with ECR. The aim of this in vitro study was to evaluate the fracture resistance of treated and non-treated teeth with simulated ECR using two different treatment modalities.

Materials and Methods: Forty-eight extracted human permanent mandibular central incisors were selected. Teeth were randomly divided into …

The Pattern Of Odontogenic Referred Pain, James J. Poulos

Graduate Theses, Dissertations, and Problem Reports

Background: Referred odontogenic pain (RP) is a phenomenon that is seen regularly in dentistry and it is not extensively understood. It can make formulating a proper diagnosis difficult and its presence can lead to inappropriate treatment.

Methods: 250 patients experiencing odontogenic pain within the dental clinics of West Virginia University were surveyed. The survey inquired about the patient’s biographical information, medical history, characteristics of the pain, the presence and location of RP, and the psychosocial effects of the pain. Additionally, the endodontic diagnosis of the offending tooth was determined by a member of the endodontic department. The collected …

The Design And Physical Properties Of An Optimized Chitosan Hydrogel For Potential Use In Endodontics, Hunter Housley

Master's Theses (2009 -)

Introduction: The aim of this study was to synthesize an optimized chitosan/carbon dot hydrogel and measure its effects on the proliferation of dental pulp stem cells. Methods: 1.5% w/v chitosan hydrogel samples were fabricated with 300 mg/ml aqueous β-glycerol phosphate (β-GP) to create an optimized chitosan with a gelation onset temperature below 37°C. Spermidine-functionalized carbon dots (CDs) were added to test groups in concentrations of 25 µg/ml and 50 µg/ml. Complex shear viscosity of the prepared hydrogel samples was evaluated with a Kinexus pro+ shear rheometer (Malvern Panalytical). Samples were evaluated for cellular proliferation with dental pulp stem cells at …

Assessment Of Fracture Resistance Of Maxillary First Molars After Root Canal Preparation Using Three Different Rotary Instruments (V-Taper, Protaper, Vortex Blue): Finite Element Analysis, Mehran Malakpour

Graduate Theses, Dissertations, and Problem Reports

Introduction: Long term success of endodontically treated teeth has been one of the most challenging aspects of the field of endodontics due to reduced fracture resistance of these teeth. Recently, researchers have heightened focus on conservative endodontics in order to sustain the tooth integrity, and reduce factors impacting the fracture resistance of endodontically treated teeth. As a result, rotary instrument manufacturers have developed files that have a minimal effect on original root canal anatomy. This study used Finite Element Analysis to investigate the dental biomechanical effect of rotary instrumentation during root canal therapy. The aim of this study is to …

The Effect Of Novel Antibiotic Compounds On Endodontic Biofilms, Steven Rhodes

All ETDs from UAB

Purpose: To investigate the effects of three novel experimental antibiotics on monospecies (Enterococcus faecalis) and polymicrobial (mixed) endodontic biofilms. Materials and Methods: Biofilms containing pure Enterococcus faecalis, as well as biofilms derived from mixed bacterial samples aspirated from inside the pulp spaces of necrotic human teeth, were grown onto slices of human dental in vitro. Biofilm formation capability was verified with SEM. The treatment groups consisted of 3 novel experimental antibiotics. 8.25% sodium hypochlorite and sterile saline were used as the controls. The biofilms were investigated with live/dead fluorochrome staining and confocal laser scanning microscopy. Results: The full strength sodium …

The Effect Of Instrumentation Taper On Dentin Conservation, Megan E. Green

Theses and Dissertations

Introduction: The aim of this in vitro study was two part. The first being to assess and compare the amount of dentin removed by an instrument with a taper of 0.04 versus an instrument with a taper of 0.06 using the Edge Evolve® file system at different increments within the canal system. Secondly, this study evaluated whether instrumentation with either taper resulted in a remaining dentin thickness (RDT) of less than 0.3mm. If this RDT was imposed upon, fracture resistance was compromised. Both pre and post instrumentation measurements were taken of samples instrumented with the 0.04 and 0.06 tapered files. …

Evaluation Of Volumetric Change Of Periapical Lesions After Apicoectomy As A Measure Of Postsurgical Healing Utilizing Cone Beam Computed Tomography, Eshwar Arasu

Theses and Dissertations

The aim of this study was to evaluate whether volumetric changes in persistent periapical lesions can be detected in follow-ups six months to five years after apicoectomy using cone-beam computed tomography. Patients with a previous treatment history of apicoectomy and for whom a pre-surgical CBCT scan was taken between November 2010 and December 2015 were invited to participate in the study. A post-surgical CBCT image of the treated tooth was obtained at the recall visit. Volumetric and linear measurements of periapical lesions on initial and postoperative CBCT images were performed using DiThreshGUI software and two calibrated examiners—a board-certified endodontist and …

A Comparative Study Of Intraradicular Enterococcus Faecalis Biofilm Removal With Three Root Canal Treatment Systems: A Scanning Electron Microscopy Evaluation, Cyrous Ardalan

Theses and Dissertations

The objective of this study was to evaluate the biofilm removal efficacy of three root canal treatment systems: ProUltra® PiezoFlow™, traditional needle irrigation, and the GentleWave® system in an ex-vivo benchtop study. Twenty-four extracted maxillary and mandibular molars were selected. Teeth were all instrumented to a master apical file size #25 with 4% taper. Teeth were then randomly divided into four experimental groups and two control groups. The root canals were inoculated with a culture of Enterococcus faecalis and incubated for five weeks to form a biofilm. Each group was then treated with one of the different root canal treatment …

Torsion And Bending Properties Of Edgeendo Files, Chad Hansen

Master's Theses (2009 -)

Introduction: One important step of root canal therapy is the process of cleaning and shaping each canal. This process involves using endodontic rotary files combined with chemical irrigants to remove pulpal remnants and infected dentin from the canal while eliminating pathogenic bacteria. It is essential to maintain proper canal anatomy while cleaning and shaping. The challenge for the practitioner is to select a rotary file system that will be flexible enough to maintain canal anatomy but strong enough to prevent breakage under normal use. File flexibility allows for better maintenance of canal anatomy. A file’s resistance to torsional fatigue reduces …

Differential Scanning Calorimetric (Dsc) Study Of New And Sterilized Nickel-Titanium Rotary Endodontic Instruments, Michael Dyriw

Master's Theses (2009 -)

Introduction: Nickel-Titanium (NiTi) files have become popular in endodontic procedures compared to traditional stainless steel hand files owing to their increased flexibility which is especially advantageous in curved canals. Due to the associated costs, endodontic instruments are frequently re-used, which requires sterilization between uses. With the application of temperature NiTi has the ability to undergo phase transformations, altering the properties of the instruments. The purpose of this study was to investigate phase transformations of four brands of NiTi rotary endodontic instruments in the as-received condition and after multiple sterilization cycles under steam sterilization, using differential scanning calorimetry. Materials and Methods: …

Comparison Of Three Different Nickel-Titanium Endodontic Rotary Systems In Shaping Simulated S-Shaped Canals, Elineida Perez

Master's Theses (2009 -)

Introduction: Preparation error may result during mechanical instrumentation because of the complex anatomy of the root canal. Thus, flexibility and resistance to fracture are ideal properties that endodontic instruments should have. The aim of the study was to compare the shaping ability of three different nickel-titanium rotary instruments in simulated S-shape root canals by measuring transportation and canal volume change CVC. Materials and Methods: A total of 60 S-shaped canals in resin blocks were randomly allocated into 3 groups (n=20): Vortex Blue (Dentsply-Tulsa Dental Specialties), HyFlex CM (Coltène/Whaledent) and EndoSequence (Brasseler USA). Canals were filled with dye and secured in …

Restorative Characteristics Of Intrapulpally Cracked Teeth, Charles M. Beavers

Theses and Dissertations

Cracked teeth have long presented a diagnostic challenge. Previous investigators have considered possible predictive factors, many of which revolve around the tooth’s restorative characteristics. Few have investigated the restorative status of teeth with cracks extending into the pulp chamber. The purpose of this investigation was to determine the prevalence of the different types of restorations present in intrapulpally cracked teeth and determine any other restorative factors that may aid in predicting the presence or extent of an intrapulpal crack. Intrapulpally cracked molars requiring endodontic therapy at the VCU Graduate Endodontic Practice were included in this study. For each tooth, the …

Designing A Process To Reliably Split Extracted Teeth To Access The Dental Root Canal, Happy Singh Ghag

UNLV Theses, Dissertations, Professional Papers, and Capstones

Introduction

Mesenchymal stem cell (MSC) research is a contemporary topic in modern healthcare. These cells have the ability to divide and generate progeny, which then become committed to specific and distinctive end-stage phenotypes, such as cartilage or bone (Caplan 1991). MSCs have been isolated from a variety of tissues such as the umbilical cord, bone marrow, adipose tissue (Ding, Shyu & Lin 2011) and dental pulp (Takeda et al 2008). Although dental pulp is a viable source for MSCs, peer reviewed research has given limited attention to its retrieval process through intentional tooth splitting of extracted teeth. The purpose of …

Postoperative Pain After The Use Of A Dexamethasone Rinse As An Irrigant Prior To Obturation, Sushant Mahajan

Master's Theses (2009 -)

Purpose: This randomized, single-blind pilot study was to determine the effect of dexamethasone on post-operative pain when used as an intracanal rinse prior to obturation.

Materials and Methods: Ten adult volunteers were enrolled. They presented to the Marquette University School of Dentistry for endodontic treatment and experienced pain from irreversible pulpitis. The patients were randomly assigned to either the control group that received standard of care treatment or the experimental group that received the rinse with 4 mg/mL dexamethasone solution prior to obturation. Before and after treatment, the patients recorded their pain level on the numeric rating scale (NRS). Recordings …

Decontamination Of Endodontic Gutta-Percha: An In-Vitro Study, Mariya Shnaydman

Master's Theses

No abstract provided.

K3 Endo, Pro Taper, And Pro File Systems: Breakage And Distortion In Severely Curved Roots Of Molars, Matthew Todd Ankrum

Theses and Dissertations

K3 ENDO, PRO TAPER, AND PRO FILE SYSTEMS: BREAKAGE AND DISTORTION IN SEVERELY CURVED ROOTS OF MOLARS.By Matthew T. Ankrum, D.D.S.A Thesis submitted in partial fulfillment of the requirements for the degree of Master of Science at Virginia Commonwealth University.Virginia Commonwealth University, 2003Major Director: Gary R. Hartwell, D.D.S., M.S.Chairman and Professor, Department of EndodonticsIt was the aim of this study to investigate the incidence of file breakage and distortion when the Pro Taper, K3 Endo and ProFile systems were used to instrument canals in the severely curved roots of extracted molars.Forty-five roots of extracted mandibular and maxillary molars with curvatures …