Statistical validation of the computerized method for calculating vertebral bone age / Validation statistique de la méthode informatisée pour le calcul de l'âge osseux vertébral

INTRODUCTION: For planned orthodontic therapy to be effective, it is important to define a treatment time based on the estimation of the child's growth stage, skeletal maturation and therefore bone age. In a single irradiation via profile teleradiography, it is possible to obtain sufficient information to place the patient on his growth curve since the vertebral stages are good indicators of physiological maturity. OBJECTIVE: The objective was to statistically validate the vertebral computerized method (MIV) on a large sample in order to reliably and reproducibly locate the stage of vertebral maturation. MATERIALS AND METHODS: Hand-wrist radiographs and profile teleradiographs of 30 patients were included to set up the MIV. To validate the MIV, panoramic and telecranial radiographs of 192 children were included in the study. Spearman correlation tests were then performed to assess correlations and Lin's concordance coefficient calculations were used to analyze concordances. CONCLUSION: The correlations and concordances obtained were statistically significant, positive and moderate. The vertebral computerized method is a method that seems reliable and usable in orthodontic practices.

INTRODUCTION: Pour qu'une thérapeutique orthodontique planifiée soit efficace, il est important de définir un moment de traitement à partir de l'estimation du stade de croissance de l'enfant, de sa maturation squelettique et donc de son âge osseux. En une seule irradiation via la téléradiographie de profil, il est possible d'obtenir les informations suffisantes pour placer le patient sur sa courbe de croissance puisque les stades vertébraux sont de bons indicateurs de maturité physiologique. OBJECTIF: L'objectif était de valider statistiquement, sur un gros échantillon, la méthode informatisée vertébrale (MIV) pour situer de façon fiable et reproductible le stade de maturation vertébrale. MATÉRIELS ET MÉTHODES: Les radiographies main-poignet et les téléradiographies de profil de 30 patients ont été incluses pour mettre en place la MIV. Pour valider la MIV, les radiographies panoramiques et les télécrânes de 192 enfants ont été inclus dans l'étude. Des tests de corrélation de Spearman ont ensuite été effectués pour évaluer les corrélations et les calculs des coefficients de concordance de Lin ont permis d'analyser les concordances. CONCLUSION: Les corrélations et les concordances obtenues sont statistiquement significatives, positives et modérées. La méthode informatisée vertébrale est une méthode qui semble fiable et utilisable en pratique dans les cabinets d'orthodontie.

[Computerized method for calculating cervical vertebral maturation]. / Méthode informatisée pour le calcul de l'âge osseux vertébral.

For Helm, "the rhythm of facial growth often governs the course of orthodontic treatment". The moment of treatment is an important dimension for our therapy to last a minimum of time with a greatest chance of success and stability. This notion of processing time is a daily requirement in our practices. The radiographs of the wrists will gradually disappear according to the ALARA principle, since we can in a single irradiation, via the profile radiography, have sufficient information to situate the patient on its growth curve. The vertebral stages are good biological indicators of individual skeletal maturity but their interpretation remains difficult. In this work, a computerized method was used to determine the stage of vertebral maturation in a reliable and reproducible manner. In this study, 15 young boys and 15 young girls (total 30 patients) were included, 12,2 years old on average with a standard deviation of 2,6 years. To determine the skeletal age of these patients, the practitioner made an hand-wrist x-ray and, for diagnostic reasons, he also made a profile radiography the same day. The patients who didn't made an hand-wrist x-ray were excluded. The vertebral computerized method seems to be a reliable method to be used in orthodontic practices. Other studies would allow to use this method for average ages, gender-appropriate.

[Influence of mandibular somesthesia on cephalic deviation and spatial representations]. / Influence de la somesthésie mandibulaire sur la déviation céphalique et les représentations spatiales.

Mandibular proprioception would influence postural control. The development of spatial references are governed by the same afferences. This work aims to clarify the role of mandibular proprioception, implicated in postural and spatial dysfunctions, in the control of cephalic posture and spatial repositories. 24 subjects received a vibration of the masseter and temporal muscles. Measurements of head position (HP) (video), subjective visual vertical (SVV) and line bisection (LB) were obtained with and without vibration. Without vibration, HP (0.31 ° ± 1.76 °) was negatively correlated with SVV (+ 0.23 ° ± 0.62 °, r22 = -0.44, p = 0.033); with vibration, HP on the opposite side to the stimulated muscle (t23 = 2.77, p = 0.011). There is a correlation between LB and SVV. Without vibration, the Müller effect is found for SVV. The pseudo-negligence is not found. With vibration, the error of the HP and the SVV go in the same direction. No effects on the LB. Conclusion: Beyond local responses, the vibration can evoke global and oriented responses.

[Craniomandibular relations and anti-gravity posture: stabilometric study disclusion wedges]. / Relations cranio-mandibulaires et posture anti-gravitaire : étude stabilométrique de cales de désocclusion.

Cephalometric parameters are thought to influence static posture. The present work evaluates the relationships between skeletal class or facial divergency, on one hand, and body posture, on the other hand. ANB and FMA angles were measured from profile cephalograms in twenty healthy adults. From each, stabilograms were recorded, with eyes open or shut, and with or without disclusion splints. Without splints, ANB and FMA proved to correlate with the accuracy of postural control. Adding splints changes the average position of the center of pressure exerted on the ground by the body, the anterior-posterior axis, and this effect is consistent with that of the typology. It also alters the displacement of the center of pressure on the same axis. These effects depend on whether the eyes are open or closed. The data reinforces the notion of the impact of cephalometric parameters and their mechanical changes on the static posture. They invite us to take greater account of postural impact of splints used in orthodontic practice.