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Objectives: Rapid development of digital technologies and 3D printing provide new tools for orthodontic indirect bonding. The purpose of this in-vitro study is to evaluate the clinical acceptability of hard CAD/CAM indirect bonding tray. Material & Methods: Ten soft silicone transfer trays and ten hard CAD/CAM trays were produced and 200 brackets were placed on them. The brackets were then transferred to twenty SLA-printed models by indirect bonding. These models were scanned and digitally compared to the reference model by three-dimensional superimpositions (GOM software). The linear and angular measurements were collected and analysed. Results: For the CAD/CAM trays, 100% of the mesiodistal, vertical and transverse measurements of incisors were within the clinical acceptable range of the American Board of Orthodontists (ABO) standards. More specifically, the clinically acceptable linear measurements were between 97 to 100% for silicone trays while they were between 89 to 100% for CAD/CAM trays. The clinically acceptable angular measurements varied between 87% and 100% for the silicone trays and between 79% and 100% for the CAD/CAM trays. Silicone trays were more precise than CAD/CAM trays. The difference was significant for all linear and angular measurements. Conclusions: While the CAD/CAM group shows clinically acceptable results according to the ABO, silicone remains to be more precise than CAD/CAM for transfer trays and is therefore still the reference. Clinical relevance: We demonstrate here that the orthodontic indirect bondings, whether they are realized using silicone transfer trays or CAD/CAM trays, are clinically acceptable in terms of the repositioning accuracy of brackets.

OBJECTIVES:The present study aimed to assess the influence of dental occlusion on body posture and the competitive performance of young elite rowers.METHOD:Dental occlusion disturbance devices were used to simulate dental malocclusions. We assessed the influence of malocclusion on the body balance, paravertebral muscle contraction symmetry, and muscular power of young elite rowers. A nonparametric permutation test for repeated measures ANOVA, a Cochran's Q test for paired data and a paired Student's t-test were used in order to statistically evaluate the influence of artificial occlusal disturbance on each factor. A force platform and a Dyno Concept 2 machine were used as measuring instruments.RESULTS:A total of 7 members of the “Pôle France Aviron” (age range of 15-17 years) were enrolled in the study. None of the body balance parameters was significantly influenced by the artificial occlusal disturbance. The interposition of an occlusal silicone splint significantly increased the proportion of athletes presenting asymmetric muscular contractions from 14.3% to 85.7% (p=0.025) and induced a significant 17.7% decrease in the athletes' muscular power (p=0.030).CONCLUSIONS:This study shows the negative impacts of an occlusal disturbance on the athletic performance of young elite rowers. The detection of malocclusion traits by regular occlusal monitoring would be of great interest in this population.

The aim of our research was to study the effects of metacognition training on the performance of older adults solving mathematical word problems. A further aim was to study the links between metacognition and executive function. Thirty-two subjects aged over 60, divided into an experimental and a control group, took part in this study which involved five training sessions. Results show that metacognition training enhanced the two metacognition components (knowledge and skills) and the mathematical problem-solving capacities of the participants. They also suggest that the use of metacognition by older people to solve mathematical word problems is supported by executive functions (updating, shifting) and particularly by processing speed.

In medicine, self-measurement and monitoring have been used for many years and have become paradigms, especially in the therapeutic follow-up of diabetes 3,22,37,40,42 and arterial hypertension 2,11,31,32,33,41. Orthodontics requires regular monitoring of the displacements, appliances, and aids. Remote monitoring is a new possibility that meets a real need regardless of the type of technique used. The Dental Monitoring system (DMS), the only solution to our knowledge, has, for the first time ever, provided a comprehensive and structured response to this need.

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