Dental faculty

Clermont-Ferrand, France

Dental faculty

Clermont-Ferrand, France
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Mishellany-Dutour A.,Dental Faculty | Peyron M.-A.,French National Institute for Agricultural Research | Croze J.,Dental Faculty | Francois O.,Dental Faculty | And 2 more authors.
Food Quality and Preference | Year: 2011

To study food disruption and bolus formation, a simulator of mastication (AM2) was developed to mimic masticatory behaviour and allow collection of a bolus at any stage in the masticatory sequence. Here we set out to validate the AM2 by comparing boluses obtained in vitro and in vivo.Boluses were obtained from the AM2 and 30 young dentate subjects chewing peanuts and carrots. Median particle sizes (d50) of the boluses were extracted from image analysis results. The number of cycles was set at the mean in vivo value. The force range was chosen to match in vitro and in vivo values.The AM2 proved reliable; no significant difference between repetitions was observed. The in vitro and in vivo boluses displayed the same d50 values for each food. In vitro and in vivo boluses obtained at different times during the chewing process were also similar. © 2010 Elsevier Ltd.

Simonis P.,University of Strasbourg | Dufour T.,Dental Faculty | Tenenbaum H.,University of Strasbourg
Clinical Oral Implants Research | Year: 2010

Objectives: The aim of the present study was to evaluate the long-term results of dental implants using implant survival and implant success as outcome variables. Methods: Of the 76 patients who received 162 implants of the Straumann Dental Implant System during the years 1990-1997, 55 patients with 131 implants were recalled 10-16 years after implant placement for a complete clinical and radiographic examination, followed by a questionnaire that examined the degree of satisfaction. The incidence of biological and technical complications has been carefully analysed for each implant. Success was defined as being free of all these complications over the entire observation period. Associated factors related to peri-implant lesions were analysed for each implant. Results: The long-term implant cumulative survival rate up to 16 years was 82.94%. The prevalence of biological complications was 16.94% and the prevalence of technical complications was 31.09%. The cumulative complication rate after an observation period of 10-16 years was 48.03%, which meant that substantial amounts of chair time were necessary following implant placement. The majority of implant losses and biological complications were concentrated in a relatively small number of patients. Conclusion: Despite a relatively high long-term survival rate, biological and technical complications were frequent. Patients with a history of periodontitis may have lower implant survival rates than patients without a history of periodontitis and were more prone to biological complications such as peri-implant mucositis and peri-implantitis © 2010 John Wiley & Sons A/S.

PubMed | Dental Faculty, University of Strasbourg, New York University and Middlesex University
Type: Journal Article | Journal: Practical radiation oncology | Year: 2016

Dental care is crucial after irradiation of the head and neck. This care may include dental restoration, extractions, and prosthetic implantation or prosthesis adjustment. To perform these procedures safely, dentists need to know the delivered radiation dose delivered to the relevant part of the mandible and/or maxilla. We propose a simple, fast, and useful contouring technique to aid accurate recording of radiation therapy dose to the mandible and maxilla.The maxilla and mandible of 2 patients, 1 dentate and 1 edentulous, have been contoured on computed tomography planning scans. The jaw has been divided into sextants (3 segments in both the mandible and maxilla) using bony landmarks.We have developed a contouring atlas to aid radiation oncologists in delineating the maxilla and mandible allowing accurate recording of dose to each sextant and meaningful communication with their dental colleagues.Delineation of the maxilla and mandible is important if we are to improve communication between radiation oncologists and dentists regarding radiation and risk to these structures. Our method should not increase the time to delineate the organs at risk and target volumes in the head and neck area and could improve the safety of subsequent dental treatments.

Woda A.,Dental faculty | Woda A.,Estaing University Hospital Center | Picard P.,Estaing University Hospital Center | Dutheil F.,Estaing University Hospital Center | And 2 more authors.
Psychoneuroendocrinology | Year: 2016

Many dysfunctional and chronic pain conditions overlap. This review describes the different modes of chronic deregulation of the adaptive response to stress which may be a common factor for these conditions. Several types of dysfunction can be identified within the hypothalamo-pituitary-adrenal axis: basal hypercortisolism, hyper-reactivity, basal hypocortisolism and hypo-reactivity. Neuroactive steroid synthesis is another component of the adaptive response to stress. Dehydroepiandrosterone (DHEA) and its sulfated form DHEA-S, and progesterone and its derivatives are synthetized in cutaneous, nervous, and adipose cells. They are neuroactive factors that act locally. They may have a role in the localization of the symptoms and their levels can vary both in the central nervous system and in the periphery. Persistent changes in neuroactive steroid levels or precursors can induce localized neurodegeneration. The autonomic nervous system is another component of the stress response. Its dysfunction in chronic stress responses can be expressed by decreased basal parasympathethic activity, increased basal sympathetic activity or sympathetic hyporeactivity to a stressful stimulus. The immune and genetic systems also participate. The helper-T cells Th1 secrete pro-inflammatory cytokines such as IL-1-β, IL-2, IL-6, IL-8, IL-12, IFN-γ, and TNF-α, whereas Th2 secrete anti-inflammatory cytokines: IL-4, IL-10, IGF-10, IL-13. Chronic deregulation of the Th1/Th2 balance can occur in favor of anti- or pro-inflammatory direction, locally or systemically. Individual vulnerability to stress can be due to environmental factors but can also be genetically influenced. Genetic polymorphisms and epigenetics are the main keys to understanding the influence of genetics on the response of individuals to constraints. © 2016 Elsevier Ltd.

Brkanic T.,University of Novi Sad | Stojsin I.,University of Novi Sad | Zivkovic S.,Dental Faculty | Vukoje K.,University of Novi Sad
Microscopy Research and Technique | Year: 2012

Root canal preparation is the most important phase of endodontic procedure and it consists of adequate canal space cleaning and shaping. In recent years, rotary instruments and techniques have gained importance because of the great efficacy, speed, and safety of the preparation procedure. AIM: The aim of this research was to investigate measurement of maximal and minimal residual dentine thickness (RDT) and canal diameter after the canal preparation with different NiTi rotary files. METHODS: The research has been conducted on extracted human teeth in vitro conditions. The teeth have been divided in seven groups (20 teeth per group) depending on the kind of instruments used for root canal preparation: ProTaper, GT, ProFile, K-3, FlexMaster, hand ProTaper, and hand GT. The canals have been shaped in a crown-down manner and irrigated with 5.25% sodium hypochlorite. The roots of the teeth have been cut 1 and 3 mm from the apex. Apical preparation quality has been assessed under the polarized light microscope. RESULTS: The maximal residual dentine thickness at distance 1 mm from apex, ranged from 1.16 to 1.45 mm, and at distance 3 mm from apex, from 1.44 to 1.84 mm. The minimal dentine thickness at distance 1 mm from apex ranged from 0.52 to 0.73 mm, and at distance 3 mm from apex, from 0.66 to 0.83 mm. The canal diameters after preparation at distance 1 mm from apex ranged from 0.42 to 0.49 mm, and at distance 3 mm from apex, from 0.53 to 0.63 mm. CONCLUSIONS: There was no significant difference neither in maximal and minimal RDT, nor in canal diameters shaped with different NiTi instruments tested. All tested NiTi files have accomplished good quality preparation of apical root canal parts. © 2011 Wiley Periodicals, Inc.

Huck O.,Dental Faculty | Huck O.,French Institute of Health and Medical Research | Elkaim R.,Dental Faculty | Davideau J.L.,Dental Faculty | And 3 more authors.
Molecular Oral Microbiology | Year: 2012

Porphyromonas gingivalis infection and cathepsins protease upregulation are independently implicated in atherosclerosis worsening. In this study, we evaluated the effects of P. gingivalis infection and P. gingivalis -purified lipopolysaccharide (Pg-LPS) stimulation on the expression of cathepsin B (CATB) in endothelial cells (ECs). Analysis of the enzymatic activity and expression of CATB were investigated at the messenger RNA, protein and protein-phosphorylation levels. Effects of Toll-like receptors 2 and 4 blocking on CATB activity were also analysed. Our results showed that P. gingivalis and Pg-LPS significantly increased the activity of CATB but with different kinetics. The peak of CATB activity was observed 3h after P. gingivalis infection but it appeared 48h after Pg-LPS stimulation. The increase of CATB activity was related to its rapid tyrosine-dephosphorylation during P. gingivalis infection, whereas the levels of CATB messenger RNAs and proteins did not vary after P. gingivalis infection or Pg-LPS stimulation. Inhibition of Toll-like-receptors 2 and 4 differentially decreased P. gingivalis and Pg-LPS CATB activations. These results showed for the first time that P. gingivalis infection rapidly affects ECs and modulates CATB activity, whereas Pg-LPS effects appear to be delayed. This study suggests that direct infection of ECs by P. gingivalis may worsen atherosclerotic plaque formation via activation of the CATB pathway. © 2012 John Wiley & Sons A/S.

Saber F.S.,Dental Faculty
Indian Journal of Dental Research | Year: 2010

Aim and Objective: The aim of this study is to evaluate the positional changes that occur in mucogingival line following the use of subepithelial connective tissue graft (SCTG). Materials and Methods: In 19 Miller class I or II gingival recession defects, distance between mucogingival line (MGL) and cemento-enamel junction, also width of keratinized and attached gingiva, and clinical attachment level were measured. SCTG were used for covering the exposed roots. A fore mentioned parameters were repeated at 3, 6 and 12 months after surgery and alterations were measured. Paired t test was used to analyze the results. Results : MGL had been moved in coronal direction (4.39 ± 0.77 mm on average) during surgical approach. After 1 year, MGL shifted 2.11 ± 0.7 mm apically. In accordance with this apical shift, a significant increase in the width of keratinized and attached gingival width (2.89 ± 0.63 mm and 2.82 ± 0.5 mm, respectively) was seen (P < 0.05). Conclusion : MGL tended to revert back to its original position following the use of SCTG, and this reversion is accompanied with an increase in the keratinized and attached gingival width.

Ekstrand K.R.,Dental Faculty | Christiansen M.E.C.,Dental Faculty | Qvist V.,Dental Faculty | Ismail A.,Restorative science and Endodontics
Community Dentistry and Oral Epidemiology | Year: 2010

Background: Caries on children and adolescents in Denmark has declined significantly over the last 30 years. Our first analysis in 1999, however, disclosed huge inter-municipality disparities in mean DMFS values as well as in prevalence of caries on Danish children; that fluoride in the water supply and the length of the education of the mothers could explain up to 45% of the above-mentioned disparity and that very few municipalities were positive outliers, i.e. were providing significant better caries results than expected from the background variables. Three of the aims of this second analysis were to repeat the analyses done on the 1999 sample, but now on a 2004 sample and then compare it with the results from 1999. A fourth aim was by means of an interview of CDOs to determine their interpretation of relevant conditions in the public dental health service in relation dental health outcome. Methods: A total of 204 (99%) and 191 (93%) municipalities were involved in 1999 and 2004, respectively. Unit of analysis were the municipalities. Mean DMFS of 15-year-olds was used as outcome variable. Eight background variables were accounted for during the analysis: For the fourth aim, a sample of CDOs representing municipalities with positive (n = 10), with no change (n = 10), or with negative change (n = 10) in mean DMFS, relative to all municipalities, between 1999 and 2004 was selected. Results: The inter-municipality variation in mean DMFS 1999 was 0.88 to 8.73 and in 2004 was 0.56 to 6.19. The analyses found that fluoride level of the drinking water and mothers' length of education were significant variables explaining about 44% of the variations in mean DMFS in both years. Only one municipality was characterized as a positive outlier in 1999 as well as in 2004. The dose-response relations between increasing fluoride concentrations in the water supply and DMF-S values diminished in both years at a level above 0.35 ppm. The structured interview disclosed that municipalities with significant improvement in mean DMFS from 1999 to 2004 had established goals and were committed to the prevention of dental caries at the individual level. Instability in manpower; number of children in the service and economy was associated to municipalities with negative changes in caries experience. © 2009 John Wiley & Sons A/S.

PubMed | Dental Faculty
Type: Comparative Study | Journal: Journal of periodontology | Year: 2015

Obesity is considered a risk factor for periodontitis. However, its influence on periodontal therapy has not been clearly determined. The aim of this case-control study is to evaluate the association between adiposity measurements, non-surgical periodontal treatment outcomes, and influencing factors in patients with chronic periodontitis.Eighteen obese and 18 normal-weight (NW) patients are included in this study. The waist/hip ratio (WHR), plaque index, bleeding on probing, probing depth (PD), and clinical attachment level (CAL) were measured at baseline and 3 and 6 months after treatment. Univariable and multivariable analyses were used to evaluate the influence of sex, age, baseline percentage of PD >3 mm, WHR, and obesity on periodontal treatment outcomes.Demographic and periodontal characteristics at baseline were similar in both groups. All periodontal parameters were improved during treatment in both groups. PD reduction and CAL gain were 0.88 and 0.84 mm in NW individuals and 0.79 and 0.68 mm in obese individuals. The difference in moderate-to-deep pocket (PD >5 mm) percentages between the baseline and 6-month examinations was 9.1% in NW individuals and 6.08% for obese individuals. Multivariable analysis showed that obesity negatively influenced changes of PD >5 mm percentages. This influence was also observed at 3 months for improving sites (PD decrease >2 mm between examinations) if WHR was also considered in the analysis.A negative association between adiposity measurements and periodontal treatment outcomes was observed mainly for moderate-to-deep pockets. Consideration of WHR and other influencing factors amplified the negative effect of obesity on periodontal treatment outcomes.

PubMed | Dental Faculty
Type: Journal Article | Journal: Medical principles and practice : international journal of the Kuwait University, Health Science Centre | Year: 2016

The aim of this study was to evaluate the level of uric acid (UA) in saliva, which is considered to be an antioxidant defense biomarker against oxidative stress in patients with oral lichen planus (OLP).In this case-control study, 25 OLP patients were included. The reticular form of OLP was verified by a clinical examination with Wickham striae, and other types (erosive, atrophic, ulcerative) were confirmed by histopathological assessment. Thirty healthy individuals matched for age and gender were selected as the control group. In both groups, the Navazesh technique was used to collect the unstimulated saliva. Then, the amount of UA was measured using a Cobas Mira autoanalyzer with a wavelength of 546 nm. The Student t test was used to analyze the data assuming a significance level at <0.05.Of the 25 patients, the most common type of OLP was erosive (n = 11, 44%), and the most common site of OLP was seen as bilateral in the buccal mucosa (n = 12, 48%). The mean level of salivary UA was significantly lower in the patients with OLP (2.10 0.19 mg/dL) in comparison with the control group (4.80 0.29 mg/dL; p < 0.001).In this study, OLP was associated with a decrease in UA levels in the saliva. Salivary UA as a biomarker could be used for monitoring and treating OLP.

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