A new method: measurement of microleakage volume using human, dog and bovine permanent teeth

This study investigates the feasibility of a different new approach to determining the microleakage volume associated with dental restorations (Class V cavity restorated with glass ionomer cement + high copper amalgam) and the relative marginal adaptation deficiency of dog, bovine and human permanent teeth in in vitro conditions. Also researched is the appropriateness of using dog and bovine teeth in in vitro studies rather than human teeth. Our method utilizes the molecular adsorption characteristics of methylene blue. Within the framework of this study, 60 permanent teeth (20 human, 20 dogs and 20 bovine) were used. These groups were evaluated statistically, of which indicated no statistically significant differences (p > 0.05). It was also concluded that this preliminary investigation showed that the new microleakage volume measurement method may be a valuable new technique for the in vitro study of microleakage dynamics around dental restorations

Interest rates linkages for G-6 countries

This study examines the long-run, medium-run and short run interest rates linkages among G-6 countries from 1991 till 2009. We use several conventional and unconventional techniques such as cointegration, codependence and wavelet comovement. Our results show that 19 out of 45 pairs are cointegrated and 11 of them have cointegration relation with a structural break. Existence of cointegration relation implies that only 19 pairs have common stochastic trend. On the other hand, using codependence, we find that 15 out of 19 pairs both have common stochastic trend and common cycles and 23 pairs have only common cycles. In total 38 out of 45 pairs have common cycles. In terms of the Rua (2010) wavelet comovement methodology, our results are in line with the argument that the comovement was dependent on the US at every frequency

Real exchange rates and bilateral trade dynamics of Turkey: panel cointegration approach

The aim of this article is to analyse Turkey's bilateral trade dynamics with respect to a panel of seven countries. Employing several panel cointegration techniques, we show that the effect of a devaluation of Turkish currency on trade balance is country specific and there is no J-curve effect.

Influence of Fiber-reinforced Composites on the Resistance to Fracture of Vertically Fractured and Reattached Fragments

WOS: 000289318600023PubMed ID: 21419307Introduction: The aim of this in vitro study was to evaluate the fracture type and test the effects of 2 different fibers on fracture strength of roots with reattached fragments. The null hypothesis was that adding suitable fibers to the content of dual-cure adhesive resin cement increases the fracture resistance of reattached fragments under vertical forces. Methods: Root canals of 45 teeth were prepared, and the teeth were intentionally fractured into 2 separate fragments. Control groups (n = 7 each) consisted of unfractured teeth with instrumented and obturated or only instrumented root canals. The fractured teeth were divided into 3 groups (n = 15 each), and separated fragments were reattached by using (1) dual-cured resin cement (Clearfil SA), (2) dual-cured resin cement + polyethylene fiber (Construct), or (3) dual-cured resin cement + glass fiber (Stick-Net). Force was applied at a constant speed of 0.5 mrn/min to the root until fracture. Mean load was recorded and analyzed statistically by using Kruskal-Wallis and Dunn tests (P = .05). Fracture types were analyzed by using chi(2) analysis with Yates correction. Results: Stick-Net demonstrated the lowest fracture resistance (P .05). The roots in the control group showed the highest fracture resistance. However, there was no statistically significant difference between the Construct, Clearfil SA, and control groups (P > .05). Conclusions: Separated fragments of vertically fractured teeth can be reattached by using a dual-cured resin or by adding polyethylene fiber (Construct). (J Endod 2011;37:549-553

Effectiveness of the self-adjusting file versus ProTaper systems to remove the smear layer in artificially induced internal root resorption cavities

Aim: Smear layer removal from artificially prepared internal root resorption (IRR) cavities using the self-adjusting file (SAF) system with activated continuous irrigation or the ProTaper system (Dentsply Maillefer, Ballaigues, Switzerland) with conventional syringe/needle irrigation was compared. Materials and methods: Twenty-eight maxillary central incisors were selected, decoronated and 20 of them were randomizedly splited along the coronal plane into labial and lingual sections, and artificial IRR cavities were prepared in both walls. Tooth segments were rejoined and teeth were divided into two groups. Each group (n = 10) was prepared using the SAF or ProTaper system with 12-mL 5.25% NaOCl and 12-mL 17% EDTA. Root canals were prepared in six intact positive control teeth using the SAF or ProTaper system with 5.25% NaOCl and 17% EDTA. As negative controls, two intact teeth were prepared using NaOCl only. Roots were than split longitudinally from the rejoined segments and samples were evaluated under scanning electron microscopy using a five-point scoring system. Results: Most SAF (87%) and ProTaper (83%) samples (P > 0.05), had scores of 1 and 2 indicating clean canal walls for the IRR cavities. Conclusions: SAF with activated continuous irrigation and ProTaper with conventional syringe/needle irrigation both successfully removed the smear layer from artificially prepared IRR cavitie

Evaluation of Ectodermal Dysplasia

This case series report outlines possible cranio-maxillofacial deformation consequences associated with ectodermal dysplasia (ED) and embryonic malformations, including dental agenesis. Also described are the oral aspects and rehabilitation. A total of 14 ED patients (7 males and 7 females, aged 5-45 years) underwent clinical examination before assessment and treatment. Lateral cephalometric radiography, Steiner's analysis, and respiratory capacity tests were performed. Most of the patients had sparse or absent hair, a short face with an unusual facial concavity, a maxillary retrusion, and a relative mandible protrusion. Depending on age and orthopedic abnormalities, patients were treated with prosthodontic and orthodontic approaches or implant treatment. Therapists should take a comprehensive and multidisciplinary approach with these patients to improve their dental, masticatory, growth, and orthognathic conditions, as well as esthetic appearance

An Interdisc\u131plinary Approach in a Patient with Amelogenesis Imperfecta: A Clinical Report and Literature Review

This clinical report describes an interdisciplinary approach for the coordinated treatment of a 20- year\u2013old woman patient diagnosed with amelogenesis imperfecta. The treatment objective was to restore masticatory function, to reduce dental sensitivity and improve the facial esthetics. A multidisciplinary team approach treatment is recommended, including periodontology, orthodontics, endodontics, and prosthodontics. Prosthodontic treatment included composite laminate veneers and metal-ceramic fixed partial dentures. After treatment the patient was regularly recalled during the 25-months postoperative period. Radiographic and clinical examinations at recall revealed no evidence of complications associated with the restored teeth or their supporting structures. Case report & Review (J Int Dent Med Res 2012; 5: (3), pp. 169-172) Keywords: Amelogenesis imperfecta, prosthodontic treatment, interdisciplinary approach, enamel hypoplasia, esthetics