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International audience; The aim of this study was to assess on videographs the intra- and inter-rater reproducibility of the Smile Esthetic Index (SEI) that has been previously validated on photographs. Smile videographs were obtained using a smartphone associated with the Smile Lite MDP mounted on a tripod. They were then randomized and evaluated twice consecutively at a 1-week interval by three periodontists according to the SEI based on 10 variables. Cohen’s Kappa and Fleiss’ Kappa tests were performed to measure intra- and inter-rater agreement. Sixty-five smile videographs of 24 men and 41 women (mean age 33 ± 11.3 years) were scored. A mean intra-rater agreement of 0.68 (0.64–0.73) was obtained, representing substantial agreement. The inter-rater agreement calculated for each variable ranged from 0.31 for the variable “absence of visible excessive gingiva” to 0.90 for the variable “absence of diastema and/or missing inter-dental papilla.” Within the limits of this study, we have demonstrated that it was possible to use videographs to reproducibly evaluate an aesthetic score (SEI) previously validated on photographs.

Members of the genus Kingella are mostly commensals of the oral cavity, but some of them are involved in invasive infections, especially in young children. This study provides new knowledge on the diversity of this genus by describing a novel species of Kingella isolated from a dental plaque sample from a 51-year-old man with a history of periodontitis. Morphological and chemotaxonomic characteristic were investigated using different growth conditions, pH and temperature. Cellular fatty acid methyl ester (FAME) analysis was performed by gas chromatography/mass spectrometry (GC/MS). Phylogenetic analysis based on 16S rRNA, orthologous average nucleotide identity (OrthoANI) and digital DNA–DNA hybridization (dDDH) relatedness were also performed. Strain Marseille-Q4569T was found to be a facultative aerobic, nonmotile and non-spore-forming rod-shaped bacterium that grows at 28–41.5 °C (optimum 37 °C), pH 5.5–8.5 (optimum pH 7.5) and 5–15 g/L of NaCl. The major fatty acids were Hexadecanoic acid (32.7%), 11-Octadecenoic acid (26.1 %) and 9-Hexadecenoic acid (21.3 %). Despite high 16S rRNA gene sequence similarity (98.72%) between strain Marseille-Q4569T and Kingella oralis strain UB-38T, the degree of OrthoANI was at the limit of the cutoff (95.83%), and the degree of dDDH was lower (63.6%) than thresholds used to delineate prokaryotic species. Therefore, it is proposed that strain Marseille-Q4569T represents a novel species of the genus Kingella, for which the name Kingella bonacorsii sp. nov. is proposed (=CSUR Q4569).

Dental plaque is a structurally and functionally organized biofilm, consisting of more than 700 different bacterial species. It represents the direct aetiological factor of diseases affecting hard and soft oral tissues. The interest of this work is to place the individual plaque control as the keystone of all therapies by highlighting its importance on oral health and on treatments’ durability. After a first part dealing with the structural feature and the mechanisms of formation and elimination of dental plaque, we will explore its impact on restorative, periodontal, implant, orthodontic and prosthetic therapies in five distinct parts.; La plaque dentaire a été décrite comme un biofilm structurellement et fonctionnellement organisé, composé de plus de 700 espèces bactériennes différentes. Elle représente un facteur étiologique direct dans les pathologies pouvant affecter les tissus durs et les tissus mous de la cavité orale. L’intérêt de ce travail est d’inscrire le contrôle de plaque individuel comme clé de voute de toute thérapeutique en mettant en lumière son importance sur la santé orale et sur la pérennité des traitements mis en œuvre. Après une première partie exposant les caractéristiques structurelles et les mécanismes de formation et d’élimination de la plaque dentaire, nous traiterons de ses retentissements sur les thérapeutiques restauratrices, parodontales, implantaires, orthodontiques et prothétiques dans cinq parties distinctes.