Evaluation of Primary Stability of Self‐Tapping and Non‐Self‐Tapping Dental Implants. A 12‐Week Clinical Study

Purpose: The aim of this study was to investigate the relationship between surgical techniques and implant macro‐design (self‐tapping/non‐self‐tapping) for the optimization of implant stability in the low‐density bone present in the posterior maxilla using resonance frequency analysis (RFA). Materials and Methods: A total of 102 implants were studied. Fifty‐six self‐tapping BlueSkyBredent® (Bredent GmbH&Co.Kg®, Senden, Germany) and 56 non‐self‐tapping Standard Plus Straumann® (Institut Straumann AG®, Waldenburg, Switzerland) were placed in the posterior segment of the maxilla. Implants of both types were placed in sites prepared with either lateral bone‐condensing or with bone‐drilling techniques. Implant stability measurements were performed using RFA immediately after implant placement and weekly during a 12‐week follow‐up period. Results: Both types of implants placed after bone condensing achieved significantly higher stability immediately after surgery, as well as during the entire 12‐week observation period compared with those placed following bone drilling. After bone condensation, there were no significant differences in primary stability or in implant stability after the first week between both implant types. From 2 to 12 postoperative weeks, significantly higher stability was shown by self‐tapping implants. After bone drilling, self‐tapping implants achieved significantly higher stability than non‐self‐tapping implants during the entire follow‐up period. Conclusions: The outcomes of the present study indicate that bone drilling is not an effective technique for improving implant stability and, following this technique, the use of self‐tapping implants is highly recommended. Implant stability optimization in the soft bone can be achieved by lateral bone‐condensing technique, regardless of implant macro‐design.     

Creating an objective structured teaching examination to evaluate a dental faculty development program

This article describes the creation of an objective structured teaching examination (OSTE) to assess a dental faculty development program. An OSTE is a performance-based measure that utilizes standardized students and is designed to measure observable teaching skills. In spring 2010, the authors developed, implemented, and evaluated an OSTE to assess a New York University College of Dentistry (NYUCD) faculty development program, Class ACTS (Advanced Clinical Teaching Scholars). They created a three-station OSTE to measure changes in teaching skills resulting from participation in Class ACTS. Dental student teaching assistants were trained to act as standardized students and patients and to use the rating forms. The faculty members' OSTE scores and ratings increased after participating in the Class ACTS program in all fifteen teaching domains tested, and statistically significant improvements occurred in nine of the fifteen domains. A search of the relevant literature suggests that this is the first time that an OSTE has been used to assess a faculty development program in dental education. This study's results appear to support NYUCD's faculty development efforts to improve the teaching skills of its faculty members.     

Le paludisme dans l’Archipel des Comores : état des lieux en 2015 après quinze années de lutte

The four volcanic islands of the Comoros archipelago are an area of intense, stable and permanent malaria transmission, almost exclusively with Plasmodium falciparum. Our purpose is to describe the current situation on malaria in Mayotte and Comoros in 2015, after the implementation of various strategies of control during the past 15 years. In 2015, Mayotte is in the phase of elimination of malaria. In the three islands forming the Union of Comoros, the transmission is much lower in the islands of Anjouan (incidence of 0.02‰) and Moheli (incidence of 0.14‰), ranking the two islands in pre-elimination phase. Grande Comore (incidence of 3.68‰) remains in the control phase with not enough time to assess what the mass treatment campaign long-term effects might be. These strategies could be applied in other islands with endemic malaria and with limited population.     

Apport d’un laboratoire dans la prise en charge des patients atteints de la maladie à virus Ebola et dans la formation des personnels soignants : expérience du Centre de traitement d’Ebola de Forécariah (Guinée) en 2015

Ebola virus disease (EVD) is associated with a high lethality rate even when the afflicted are provided with good support in an Ebola treatment center (ETC). Basic laboratory tests can help to better understand the pathophysiology of the disease, to guide treatment and to establish simple protocols and procedures tailored to the practice of medicine in the context of such precarious environment for caregivers. Based on a few clinical cases of patients treated in the ETC of Forecariah, Guinea, run by the French Red Cross, this article describes the difficult conditions associated with the provision of medical practice in this challenging environment, aiming to minimize the casualties in the EVD patient and to train the health staff.     

Insight into siderophore-carrying peptide biosynthesis: enterobactin is a precursor for microcin E492 posttranslational modification

Microcin E492-producing bacteria secrete both unmodified and posttranslationally modified microcins. The modification consists of a C-glucosylated linear trimer of N-(2,3-dihydroxybenzoyl)-l-serine, a catecholate siderophore related to salmochelins and enterobactin. We show here that repression of enterobactin biosynthesis inhibits the acquisition of microcin E492 posttranslational modification, as monitored by high-performance liquid chromatography and mass spectrometry. Furthermore, exogenous enterobactin restored the production of posttranslationally modified microcin in a bacterial strain deficient in enterobactin synthesis. We thus concluded that enterobactin serves as a precursor for the synthesis of the posttranslationally modified microcin and that the unmodified microcin is an incompletely processed form of mature microcin E492. Gene disruption experiments showed that MceC and MceD, two enzymes encoded by the mceABCDEFGHIJ gene cluster, are involved in the synthesis of the microcin E492 posttranslational modification, as followed by mass spectrometry. Genes homologous to iroB and iroD, required for the conversion (linearization and C-glycosylation) of enterobactin into salmochelins, efficiently complemented mceC and mceD, respectively. Based on our results, a model is proposed for the biosynthesis of the mature siderophore-carrying peptide.