Incidence of Deformation and Fracture of Twisted File Adaptive Instruments after Repeated Clinical Use.

Objectives: The aim of the present study was to investigate the incidence of deformation and fracture of twisted file adaptive nickel-titanium instruments after repeated clinical use and to identify and check whether the three instruments within the small/medium sequence showed similar or different visible signs of metal fatigue.

Material And Methods: One-hundred twenty twisted file adaptive (TFA) packs were collected after clinically used to prepare three molars and were inspected for deformations and fracture.

Results: The overall incidence of deformation was 22.

Protein Ontology (PRO): enhancing and scaling up the representation of protein entities.

The Protein Ontology (PRO; http://purl.obolibrary.org/obo/pr) formally defines and describes taxon-specific and taxon-neutral protein-related entities in three major areas: proteins related by evolution; proteins produced from a given gene; and protein-containing complexes.

The Cell Ontology 2016: enhanced content, modularization, and ontology interoperability.

Background: The Cell Ontology (CL) is an OBO Foundry candidate ontology covering the domain of canonical, natural biological cell types. Since its inception in 2005, the CL has undergone multiple rounds of revision and expansion, most notably in its representation of hematopoietic cells. For in vivo cells, the CL focuses on vertebrates but provides general classes that can be used for other metazoans, which can be subtyped in species-specific ontologies.

The Use of Micro-Computed Tomography to Determine the Accuracy of 2 Electronic Apex Locators and Anatomic Variations Affecting Their Precision.

Introduction: The aim of this study was to compare the accuracy of 2 electronic apex locators (EALs), Apex ID (SybronEndo, Glendora, CA) and Root ZX (J. Morita, Tokyo, Japan), by means of micro-computed tomographic (micro-CT) imaging and to determine anatomic variations that may affect their accuracy.

Methods: The root canal length (RCL) and working length (WL) of 33 single-rooted premolars were measured using a visual method, 3-dimensional micro-CT reconstructions, and 2 different EALs.

Antimicrobial photodynamic therapy of S. mutans biofilms attached to relevant dental materials.

Background: Antimicrobial Photodynamic therapy (aPDT) has demonstrated efficacy in situations where conventional antibiotic therapies can be challenged such as biofilms, gram-negative bacteria, and antimicrobial resistant organisms. Surface characteristics can affect biofilm adherence and integrity and so may modify the effectiveness of aPDT. This study investigates the killing efficacy of aPDT on S.

The Buffalo Model: Shifting the Focus of Clinical Licensure Exams in Dentistry to Address Ethical Concerns Regarding Patient Care.

Most jurisdictions grant dental licensure to graduating students following successful completion of a clinical exam. Testing agencies, which are independent of dental schools, nevertheless conduct their exams at school facilities. Patient participation in these exams raises ethical concerns regarding such issues as unlicensed providers' performing irreversible procedures with minimal supervision and graduates' limited accessibility to provide follow-up treatment.

Using Standardized Patients to Teach Interprofessional Competencies to Dental Students.

The aims of this study were to develop, implement, and evaluate a novel interprofessional standardized patient exercise (ISPE) with oral-systemic and interprofessional collaborative practice (IPCP) components. Dental students and doctor of nursing practice (DNP) students at one U.S.

Images in Clinical Medicine: Oral Manifestation of Crohn's Disease.

A 13-year-old boy presented with a 9-month history of episodic unilateral swelling of the face and oral pain. He reported having loose, nonbloody stools. Granulomatous inflammation consistent with Crohn's disease was found on histopathological examination.

Codon-optimized fluorescent mTFP and mCherry for microscopic visualization and genetic counterselection of streptococci and enterococci.

Despite the powerful potential of fluorescent proteins for labeling bacteria, their use has been limited in multi-species oral biofilm models. Fermentative metabolism by streptococcal species that initiate biofilm colonization results in an acidic, reduced microenvironment that may limit the activities of some fluorescent proteins which are influenced by pH and oxygen availability. The need to reliably distinguish morphologically similar strains within biofilms was the impetus for this work.

Dental students' HIV/AIDS-related knowledge, attitudes, and intentions: impact of the U.S. Health Resources and Services Administration's community-based dental partnership program.

Access to oral health care for vulnerable populations is one of the concerns addressed by the U.S. Health Resources and Services Administration HIV/AIDS Bureau's Community-Based Dental Partnership Program (CBDPP).

Microtensile bond strength of different acrylic teeth to high-impact denture base resins.

Purpose: This study evaluated the effect of denture base acrylic, denture tooth composition, and ridge-lap surface treatment on the microtensile bond strength (μTBS) of three commercially available denture teeth and two injection denture processing systems.

Materials And Methods: Sixteen experimental groups were formed (n = 3), according to denture tooth surface treatment (no treatment or surface treatment recommended by the manufacturer), denture base processing technique and acrylic (SR-Ivocap-Ivocap Plus or Success-Lucitone 199), and tooth type-composition at bonding interface (BlueLine DCL-PMMA, Portrait IPN-PMMA, Phonares II-PMMA, Phonares II-NHC). Rectangular bar specimens with a 1 mm(2) cross sectional area were fabricated and subsequently thermocycled at 10,000 cycles between 5°C and 55°C with a 15-second dwell time.

Dentists' willingness to provide expanded HIV screening in oral health care settings: results from a nationally representative survey.

Objectives: Using a nationally representative survey, we determined dentists' willingness to provide oral rapid HIV screening in the oral health care setting.

Methods: From November 2010 through November 2011, a nationally representative survey of general dentists (sampling frame obtained from American Dental Association Survey Center) examined barriers and facilitators to offering oral HIV rapid testing (n = 1802; 70.7% response).

Influence of surface treatment of yttrium-stabilized tetragonal zirconium oxides and cement type on crown retention after artificial aging.

Statement Of Problem: Information about the influence of zirconia crown surface treatment and cement type on the retention of zirconia crowns is limited. It is unclear whether zirconia crowns require surface treatment to enhance their retention.

Purpose: The purpose of this in vitro study was to evaluate the effect of surface treatment on the retention of zirconia crowns cemented with 3 different adhesive resin cements after artificial aging.

Protein Ontology: a controlled structured network of protein entities.

The Protein Ontology (PRO; http://proconsortium.org) formally defines protein entities and explicitly represents their major forms and interrelations. Protein entities represented in PRO corresponding to single amino acid chains are categorized by level of specificity into family, gene, sequence and modification metaclasses, and there is a separate metaclass for protein complexes.

Direct resin composite approach to orthodontic relapse. Case report.

The treatment of malaligned teeth represents a challenge, especially in the presence of root resorption. Options to improve aesthetics are limited and often involve high costs. Direct composite restorations offer an alternative for the realignment of orthodontic-relapsed teeth where orthodontic retreatment is not indicated.

Molecular analysis of 16S rRNA genes identifies potentially periodontal pathogenic bacteria and archaea in the plaque of partially erupted third molars.

Purpose: Small subunit rRNA sequencing and phylogenetic analysis were used to identify cultivable and uncultivable microorganisms present in the dental plaque of symptomatic and asymptomatic partially erupted third molars to determine the prevalence of putative periodontal pathogens in pericoronal sites.

Materials And Methods: Template DNA prepared from subgingival plaque collected from partially erupted symptomatic and asymptomatic mandibular third molars and healthy incisors was used in polymerase chain reaction with broad-range oligonucleotide primers to amplify 16S rRNA bacterial and archaeal genes. Amplicons were cloned, sequenced, and compared with known nucleotide sequences in online databases to identify the microorganisms present.

Piezoelectric vs. conventional implant site preparation: ex vivo implant primary stability.

Objectives: This study aims to determine differences in primary stability between implants placed in cortical bone following Piezoelectric or conventional site preparation, as assessed by resonance frequency analysis (RFA) and reverse torque testing (RTT).

Material And Methods: Four fresh bovine ribs were acquired and surgical guides fabricated with five sites per rib (n = 20), for proper site preparation. Implant sites were prepared via conventional drilling technique as per manufacturer's instruction (Implantium) or via Piezoelectric (Mectron) implant site preparation using the Implant Prep kit.

A clinical study to evaluate denture adhesive use in well-fitting dentures.

Purpose: The objective of this study was the assessment of retention and stability and functional benefits of denture adhesive applied to well-fitting and well-made dentures.

Materials And Methods: This was a randomized, crossover study to compare two marketed denture adhesives (test cream, Super Poligrip® Free, and test strip, Super Poligrip® Comfort Seal Strips) and an unmarketed cream adhesive (GlaxoSmith Kline Consumer Healthcare) with no adhesive as the negative control. Thirty-six subjects completed the study.

Influence of headache frequency on clinical signs and symptoms of TMD in subjects with temple headache and TMD pain.

The relationship of the frequency of temple headache to signs and symptoms of temporomandibular joint (TMJ) disorders (TMD) was investigated in a subset of a larger convenience sample of community TMD cases. The study sample included 86 painful TMD, nonheadache subjects; 309 painful TMD subjects with varied frequency of temple headaches; and 149 subjects without painful TMD or headache for descriptive comparison. Painful TMD included Research Diagnostic Criteria for Temporomandibular Disorders diagnoses of myofascial pain, TMJ arthralgia, and TMJ osteoarthritis.

The use of ultraviolet LED illumination for composite resin removal: an in vitro study.

It may be difficult to recognize composite resin restorations that are correctly shade-matched and well-placed by visual and tactile inspection alone--which can make the replacement of an existing resin restoration challenging. Many composite resins fluoresce under UV light, which can help dentists to detect resin material. This article explores a technique that utilizes a UV LED to cause composite resin to fluoresce.

The nature and frequency of medical emergencies among patients in a dental school setting.

As health care improves and life expectancy increases, dentists and dental students are treating a growing number of elderly and medically compromised patients, increasing the likelihood of a medical emergency during treatment. Previous studies examining emergencies in a dental setting have relied upon self-reports and are therefore subject to biases in reporting. The purpose of this study was to examine data generated from documentation of CODE-5 medical emergency events at the University at Buffalo School of Dental Medicine over an eight-and-a-half-year period.

Serving the public good: challenges of dental education in the twenty-first century.

The purpose of this study was to explore perceptions of the roles and responsibilities of dental education in serving the public good, and the extent to which they are being met, from the vantage point of leaders at the university and state level. Five questions were developed to gather views on dental education's success in meeting the expectations and needs of the public. Fifty-one interviews were conducted with leaders at seven institutions and with public officials in six states.

CT-based dental imaging for implant planning and surgical guidance.

CT-based dental imaging for implant planning and surgical guidance carries both clinical and radiographic information for implant positioning as far as trajectory, depth and distribution. The significance of accurate planning and surgical guidance as it pertains to critical anatomical landmarks, such as the mandibular canal, maxillary sinus and adjacent teeth, cannot be overstated. This case report describes a systematic approach to the planning and surgical placement of a single, implant-supported crown, using CT-based dental imaging for implant planning and surgical guidance.

Jacob Hemet. Dentist to royalty and entrepreneur extraordinaire.

One of the most prominent dentists in late-18th century London was Jacob Hemet, member of a long family of dentists. He was appointed royal dentist to Queen Charlotte, wife of George the Third, and to George's favorite daughter, Amelia, and the Prince of Wales. He advertised widely, both in this country and in several European countries, including his native France.