Christophe JeaninClaude Bernard University Lyon 1 | UCBL · Laboratoire des multimatériaux et interfaces (LMI)
Christophe Jeanin
PhD, DDS
About
39
Publications
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426
Citations
Citations since 2017
Publications
Publications (39)
Occlusal treatments can cause irreversible dental changes without guaranteeing clinical success. To avoid this, an initial, non-mutilating, phase of treatment using splint, for example, followed by an objective evaluation of the effectiveness is required before moving to next phase that permanently freezes the new mandibular position. As an example...
Dental loss due to periodontal diseases remains a major issue for clinical dentistry. The f urther development of periodontal regeneration strategies is still needed. In this context, the scientific community increasingly focus on tissue engineering as a promising technique to elaborate efficient biomaterials. Nevertheless, one has to accurately un...
Purpose
To investigate the relationship between the microstructure of CAD/CAM blocks and the quality of adhesion as function of the surface treatment and resin cement type.
Materials and Methods
Two nano‐ceramic composite resin CAD/CAM blocks, Lava Ultimate (LU) and Cerasmart (CS), and two Leucite‐reinforced glass ceramic CAD/CAM IPS blocks, Empre...
Objectives The mechanical interactions between tongue and palate are crucial for speech production and swallowing. In this study, we present examples of pressure signals that can be recorded with our PRESLA system (PRESLA holds for the French expression “PRESsion de la LAngue” [Pressure from the tongue]) to assess these motor functions, and we illu...
The periodontal biomechanical environment is very difficult to investigate. By the complex geometry and composition of the periodontal ligament, its mechanical behavior is very dependent on the type of loading (compressive vs. tensile loading; static vs. cyclic loading; uniaxial vs. multiaxial) and the location around the root (cervical, middle, or...
The periodontal biomechanical environment is very difficult to investigate. By the complex geometry and composition of the periodontal ligament, its mechanical behavior is very dependent on the type of loading (compressive vs. tensile loading; static vs. cyclic loading; uniaxial vs. multiaxial) and the location around the root (cervical, middle, or...
The aim of the thesis is the study of the mechanical interaction between tongue and palate in speech production and swallowing. This interaction is crucial since it determines the shape of the tongue and its time evolution before and after contacts occur. Yet it cannot be studied with conventional kinematic approaches, since magnitude of movements...
The hold phase of the stop consonants is crucial for a successful production of the release and the acoustic burst. Concurrently, it is also associated with weak acoustic energy and minimal movement, so that conventional acoustic and kinematic approaches are not relevant to investigate motor control. This paper presents an innovative experimental m...
In this study, a 3D finite element model of an intact mandible was used for the simulation of the movement of the lower jaw and analysis of the effects of TemporoMandibular Joint (TMJ) prosthesis replacement on the jaw movement. Seven bundles of muscle fibers were inserted in their appropriate positions following anatomical data. Digastric, geniohy...
Statement of problem:
Different parameters can influence the adaptation of computer-assisted design and computer-assisted manufacturing (CAD-CAM) inlay/onlay restorations. However, systematic reviews to identify and discuss these parameters are lacking.
Purpose:
The purpose of this systematic review was to summarize the scientific literature inve...
Introduction: The hold phase, during which tongue is in contact with the palate, is associated with weak acoustic energy and minimal movement 1. Hence to study the underlying motor control we suggest studying how pressure between tongue and palate varies in relation to time events that are acoustically relevant. To do so, our experimental setup was...
•Establish a spatial and temporal mapping of contacts applied by the tongue and the lips on the prosthesis during the speech production and swallowing
According to the released data, temporomandibular joint disease is a common maxillo-facial issue in all over the world. In most cases temporomandibular joint replacement is prescribed by surgeons. Despite the evolution of TMJ prosthesis by optimizing its geometry and including the real circumstances, many other considerations should be taken into a...
Statement of problem:
Recent polymer-based computer-assisted design and computer-assisted manufacturing (CAD-CAM) materials have been commercialized for inlay restorations, a polymer-infiltrated ceramic-network (PICN) and composite resin nanoceramics. Little independent evidence regarding their mechanical properties exists. Internal adaptation is...
Aim: To study the effect of thermal shock on the enamel – composite restoration interface as compared to standard thermal cycling protocol. Methodology: Box shaped cavities were prepared in thirty mandibular third molars, the cavities were restored using two step etch and rinse adhesive: Adper™ Scotchbond™ 1 XT (3M™ ESPE™, St. Paul, USA), and nano-...
Background: Dental composites are now the restoration of choice for most practitioners, due to their ease of handling and superior esthetics. At the same time the actual risk of use of Bisphenol A (BPA) and BPA derivatives in dental composites, their degree of elution, and BPA exposure levels remain controversial .
Objectives:
The aim of this case report was to assess the use of a glass fiber-reinforced composite splint in the stabilization of tooth mobility in patient with periodontitis.
Methods:
Three mandibular glass fiber-reinforced composite splint (Fast splintTM, BCM) were performed from canine to canine on three patients treated for chronic perio...
Determining and recording appropriate occlusal vertical dimension (OVD) in the treatment of the edentulous patient is an important but critical procedure in practice. Incorrect determination of the OVD may result in failure of complete denture treatment. Many methods have been advocated to determine the vertical dimension in edentulous patients. Ho...
An original experimental procedure is presented to measure the mechanical interaction between tongue and teeth and palate during speech production. It consists in using edentulous people as subjects and to insert pressure sensors in the structure of a replication of their dental prosthesis. This is assumed to induce no speech production perturbatio...
This paper describes an original experimental procedure to measure mechanical interactions between tongue and teeth during speech production. Using edentulous people as subjects, pressure transducers are inserted in their complete denture duplicate. Physiology is respected during sound and pressure recording as with standard complete denture. Origi...
This work describes the mechanical interactions between tongue, palate and teeth during the production of the stop consonant /t/ in natural and in reiterated speech. These interactions are measured via the mechanical pressure exerted by tongue on the palate and teeth. An original experimental procedure has been designed to measure the mechanical pr...
This paper describes an original experimental procedure to measure the mechanical interaction between the tongue and teeth and palate during speech production. It consists in using edentulous people as subjects and to insert pressure sensors in the structure of their complete dental prosthesis. Hence, there is no perturbation of the vocal tract cav...
Determining and recording appropriate occlusal vertical dimension (OVD) in the treatment of the edentulous patient is an important but critical procedure in practice. Incorrect determination of the OVD may result in failure of complete denture treatment. Many methods have been advocated to determine the vertical dimension in edentulous patients. Ho...
Determining and recording appropriate occlusal vertical dimension (OVD) in the treatment of the edentulous patient is an important but critical procedure in practice. Incorrect determination of the OVD may result in failure of complete denture treatment. Many methods have been advocated to determine the vertical dimension in edentulous patients. Ho...
This article describes a technique for placing a radio-based tagging transponder into a complete denture. The data stored in the transponder can be detected with a reading device, thus enabling the denture wearer to be identified.
When constructing a complete denture, the correct vertical dimension of occlusion (VDO) and centric relation (CR) can be difficult to determine. The aim of this study was to compare the swallowing technique used to determine the maxillomandibular relationship with a conventional technique. Fifteen edentulous patients were selected, each having a co...
Ce travail décrit les interactions mécaniques entre la langue, le palais et les dents lors de la production de la consonne plosive /t/en parole naturelle et en parole réitérée. Ces interactions sont mesurées via la pression mécanique exercées par la langue sur le palais et les dents. Ce travail a nécessité la mise au point d'un dispositif original...
Projects
Projects (2)
The StopNCo project aims at improving our understanding of speech control by addressing 4 questions:
1. Which acoustic features are crucial for the intelligibility of stop consonants? Instead of the traditional laboratory approach that examines the perceptual consequence of varying features in synthetic stimuli, we will characterize here how speakers enhance their speech in interactive
situations requiring intelligibility, but where acoustic cues are altered or missing (speech produced in a noisy or reverberant environment, whispered speech, …).
2. Which coordination of breathing, laryngeal and articulatory gestures enables the variation of these acoustic features, with what extent of physical constraints vs. speaker-specific control? We will simultaneously collect acoustic, aerodynamic (intra-oral pressure, airflow), laryngeal (electroglottography, endoscopy) and articulatory (movement, force sensors, surface EMG) data. We will explore how the coordination of breathing, laryngeal and articulatory gestures varies with the speaking
mode (murmured to shouted, whispered, fast, clear speech) and using speech perturbation paradigms (filtered auditory feedback, perturbed articulation, oral anesthetic, …).
3. How does this control develop normally in children and dysfunction in some of them? We will characterize how the acoustic cues to stop consonants are refined with child age, or remain deviant in children with functional articulation disorders. Using non invasive methodologies, we will identify some aspects of speech coordination that differ from adult speech, and that some children with articulation disorders have troubles to develop.
4. How the coordination of speech gestures can vary in efficiency, i.e. in the ratio between segment intelligibility and physiological efforts spent in their production? This question will first require the development of methodologies to measure or estimate laryngeal and articulatory efforts. Production efforts will be compared between non pathological adult speakers and dysphonic patients, hypothesized to coordinate less efficiently their breathing, laryngeal and articulatory gestures.
