Complete denture is a real challenge for any practitioner. The aim of implantology is to optimize prosthetic balance and ensure that prostheses are perfectly integrated from a bio-functional ...viewpoint, despite an unfavorable anatomophysiological context. Here, we present a case managed in our department concerning a mandibular complete removable denture retained by a medial symphyseal implant. A 61-year-old fully edentulous mandibular patient with a Kennedy Applegate class I edentulous maxilla in good general health consulted for the renewal of his mandibular complete denture, which was deemed unstable and non-retentive. The exo-oral examination was normal. The mandibular crest was heavily resorbed, especially posteriorly, and covered with slightly inflammatory fibromucosa. The patient refused bone augmentation surgery. We performed a piezographic mandibular prosthesis retained by a single standard implant at the level of the mandibular symphysis. The prosthesis was stable and retentive. Masticatory comfort and efficiency were satisfactory and the psychological integration of the prosthesis was improved. Several studies have shown that a single symphyseal implant is a therapeutic alternative that completes the therapeutic range in specific cases. It should be limited to the mandibular arch in elderly patients with reduced bone volume. Given the lack of randomized controlled trials, routine use of this new approach is not recommended, and further studies are required.
The search of an adequate occlusal scheme that maximizes dentures’ stability and patients’ satisfaction is an ultimate objective in every complete prosthodontic treatment. Many studies compared ...occlusal schemes in terms of retention, comfort and masticatory performance. The purpose of this article is to review literature about different occlusal schemes related to complete dentures’ stability and edentulous patients’ satisfaction, in order to select the most appropriate occlusal scheme. Thus, an electronic search was performed from PubMed (MEDLINE), Scopus, Cochrane, Google Scholar and Sciencedirect databases. 65 articles were identified of which 56 were selected to compose the present article. Within the limitations of this review, it has been concluded that edentulous patients prefer anatomic occlusal schemes to non-anatomic teeth. Furthermore, canine guidance seems to be efficace in terms of chewing comfort and dentures’ retention, as well as lingualized occlusion. However, bilateral balanced occlusion does not confer a long-term masticatory performance and satisfaction to edentulous patients.
Background: The main objective of this systematic review was to evaluate the effect of coating with titanium dioxide nanoparticles (TiO.sub.2 nanoparticle) on the surface condition of removable ...acrylic resin prosthetic base materials. Methods: Our review is registered in the PROSPERO database under the identification code CRD42023397170. Electronic database searches of PubMed, Scopus and Science Direct including studies from January 2009 to January 2023 were conducted and supplemented with manual searches. Research questions were generated in accordance with the PICO strategy. The modified Consolidated Standards of Reporting Trials (CONSORT) checklist was used to evaluate the quality of the selected studies. Results: Since the included studies were variable in design, a meta-analysis was not performed. The electronic searches retrieved 29 references that met the eligibility criteria, among which 5 studies matched the inclusion criteria for this review. Significant differences were detected between the TiO.sub.2 NP-coated and uncoated groups. The available data indicate that TiO.sub.2 NP coating elicits antimicrobial activity and improves the wear resistance of polymethylmethacrylate (PMMA) surfaces. Moreover, the nanoparticles provide high levels of glossiness and decelerate the process of color change of heat-cured acrylic resin, thus increasing the lifespan of dentures. Conclusion: The collective results clearly indicate that TiO.sub.2 nanoparticle coating induces alterations in the surface properties of pure PMMA, enhancing the mechanical, physical and biological characteristics of the denture base material. Further studies are essential to identify the optimal thickness of coating and concentrations of nanoparticles for clinical applications. Keywords: resin, denture base, polymethylmethacrylate, titanium dioxide, coating
Despite the enrichment of our therapeutic panoply by the integration of implants and CAD/CAM techniques, the removable partial denture with metallic infrastructure (RPD) will remain an unavoidable ...alternative in the rehabilitation of partial edentulous teeth. The purpose of this survey, divided into three parts, is to evaluate the knowledge, attitudes, and practices of dentists in private practice in the Rabat-Sale-Kenitra region regarding the design of removable partial dentures, to provide information on the means of communication with laboratory technicians, and to investigate possible correlations between the failure of the prosthetic project and certain adopted practices. Materials and methods The study concerned a sample of 101 dentists practicing in the region of Rabat-Sale-Kenitra to whom we sent an anonymous 4-page printed questionnaire containing 28 questions on the design of metal frames in PAPM. A descriptive and analytical statistical study was conducted to process the data. Results Following the results of the statistical study, only 8% of the practitioners performed more than ten partial removable prostheses per month, 17% did not perform a clinical examination, 20% did not perform a study model, 69% did not perform the RPD design by themselves and entrusted this task to the dental technician. In comparison, 89% did not use a Dental Surveyor. Conclusion This survey showed that many practitioners do not follow the rules of good practice and that they lack knowledge of RPD design. Therefore, postgraduate training is envisaged to eventually help practitioners implement these good practices and improve this knowledge. However, it was noted that only 58% of the practitioners in our sample were interested in such training.
Despite the enrichment of our therapeutic panoply by integrating implants and CAD/CAM techniques, the removable partial denture with metallic infrastructure (RPD) will remain an unavoidable ...alternative in the rehabilitation of partial edentulous teeth. The purpose of this survey, divided into three parts, is to evaluate the knowledge, attitudes, and practices of dentists in private practice in the Rabat-Sale-Kenitra region regarding the design of removable partial dentures, to provide information on the means of communication with laboratory technicians, and to investigate possible correlations between the failure of the prosthetic project and certain adopted practices. Materials and methods:The study concerned a sample of 101 dentists practicing in the region of Rabat-Sale-Kenitra to whom we sent an anonymous 4-page printed questionnaire containing 28 questions on the design of metal frames in PAPM. A descriptive and analytical statistical study was conducted to process the data. Results: Following the results of the statistical study, only 8% of the practitioners performed more than ten partial removable prostheses per month, 17% did not perform a clinical examination, 20% did not perform a study model, 69% did not perform the RPD design by themselves and entrusted this task to the dental technician. In comparison, 89% did not use a Dental Surveyor. Conclusion: This survey showed that many practitioners do not follow the rules of good practice and that they lack knowledge of RPD design. Therefore, postgraduate training is envisaged to eventually help practitioners implement these good practices and improve this knowledge. However, it was noted that only 58% of the practitioners in our sample were interested in such training.
Introduction : Différentes techniques d’empreinte peuvent être utilisées lors de la
réalisation des prothèses amovibles partielles métalliques
(PAPM), l’un des impératifs essentiels est ...l’anticipation de la dualité tissulaire et
le respect des structures d’appui notamment dans le cadre
des édentements terminaux
Objectif : Évaluer les pratiques des praticiens lors de la réalisation des empreintes
secondaires lors des réhabilitations par PAPM et rechercher d’éventuelles
corrélations entre les doléances prothétiques et le non-respect des différentes
normes d’empreinte secondaire.
Méthodes : L’étude a porté sur un échantillon de dentistes exerçant dans la région de
Rabat-Sale-Kenitra au Royaume du Maroc. Le questionnaire a été rempli lors
d’entretiens en face à face ou par les dentistes eux-mêmes. Le questionnaire
informatisé a été envoyé aux dentistes
par e-mail ou via différentes plateformes de réseaux sociaux.
Une étude statistique descriptive et analytique a été réalisée pour traiter les
données.
Résultats : suivant les résultats de l’étude statistique : (57,6%) utilisent seul
l’alginate pour la réalisation de l’empreinte secondaire, (66%)
utilisent des porte-empreintes individuels, (17%) ont recours à l’empreinte composée
partielle dans la gestion des édentements terminaux
mandibulaires, (77%) réalisent le remarginage dans le cadre des cl I et II de K.A.
Concernant les doléances ; les praticiens qui travaillent
avec plus d’un matériau d’empreinte ou ceux qui utilisent uniquement l’alginate ont
rencontré une combinaison de plaintes similaires (75%).
Conclusion : Les pratiques des dentistes interrogés diffèrent que ce soit par rapport
aux matériaux ou des techniques d’empreintes secondaires. On note également que les
doléances exprimées par les patients sont indépendantes de la méthode utilisée. Les
résultats de notre
enquête concordent avec le fait que jusqu’à aujourd’hui il n’y a pas de consensus ou
d’étude qui démontrent la supériorité d’une technique par
rapport à une autre, ou qu’un matériau soit plus fiable pour la l’équilibre de la
prothèse.
The separation processes are of paramount importance in the industrial field. The techniques used to obtain separation membranes depend on the type of membrane and the applications envisaged.
Aim: ...The objective of the study is to focus on the master membrane allowing better pervaporation of the water-ethanol mixture by varying various parameters such as the polymer content, the polyacrylic acid (PAA) content and the operating variables such as the drying temperature and the stay in the oven.
Materials: We fabricated membranes to separate water-ethanol mixtures by the pervaporation process. First, films based on polyvinyl alcohol and acid polyacrylics were prepared using the appropriate solvent (water) with different PAA contents. We then characterized these films using the technique of infrared spectroscopy and the measurement of swelling of these membranes in water / ethanol mixtures. Pervaporation tests were carried out to measure the selectivity and flow of these films with respect to the mixture.
Results: All the membranes exhibit a higher permeation flux than that of pure PVA, especially when the PAA content is high. The selectivity to water of these crosslinked membranes, represented by the water content in the permeate is appreciable.
Conclusion: The addition of PAA to PVA makes possible the improvement of swelling, the flow is improved as well as the water selectivity and the permeability of the membrane which makes the PVA-PAA alloy a simple and effective method to ensure dehydration of the Water-Ethanol mixture.
The separation processes are of paramount importance in the industrial field. The techniques used to obtain separation membranes depend on the type of membrane and the applications envisaged.
Aim: ...The objective of the study is to focus on the master membrane allowing better pervaporation of the water-ethanol mixture by varying various parameters such as the polymer content, the polyacrylic acid (PAA) content and the operating variables such as the drying temperature and the stay in the oven.
Materials: We fabricated membranes to separate water-ethanol mixtures by the pervaporation process. First, films based on polyvinyl alcohol and acid polyacrylics were prepared using the appropriate solvent (water) with different PAA contents. We then characterized these films using the technique of infrared spectroscopy and the measurement of swelling of these membranes in water / ethanol mixtures. Pervaporation tests were carried out to measure the selectivity and flow of these films with respect to the mixture.
Results: All the membranes exhibit a higher permeation flux than that of pure PVA, especially when the PAA content is high. The selectivity to water of these crosslinked membranes, represented by the water content in the permeate is appreciable.
Conclusion: The addition of PAA to PVA makes possible the improvement of swelling, the flow is improved as well as the water selectivity and the permeability of the membrane which makes the PVA-PAA alloy a simple and effective method to ensure dehydration of the Water-Ethanol mixture.
The existence of alveolar processes and the integrity of the maxillae outside of a specific pathological process are linked to the presence of teeth. The aging process is most often accompanied, at ...the buccal level, by a narrowing of the prosthetic corridor in relation to the importance of bone resorption and the invasion of peripheral elements. Thus, we are and will be confronted more and more with complete edentulous patients, presenting very strong resorption of the alveolar processes, even of the osseous bases, which will increase proportionally the difficulties of obtaining a good retention and good stability of the prostheses.Our work aims to review the various means available to us to prevent bone resorption, throughout the stages of prosthetic and post-prosthetic realization.
Introduction : Western Blot (WB) is the most commonly used method to confirm the presence of antibodies against Human Immunodeficiency Virus type 1 (HIV-1). The interpretation of WB, however, poses ...difficulties since of the multiplicity of criteria proposed by various international organizations. Some criteria generate an unacceptable number of indeterminate results, thus preventing the early management of patients. The present work aims to evaluate the different criteria for interpretation of WB according to various organizations compared to viral load test. Material and methods : This is a study carried out on a total of 2 618 Western Blot profiles registered during a period of 56 month (from January 2013 to September 2017) at the Laboratory of Medical Analysis of Regional Hospital Center in Agadir. Results : The results obtained indicate that some organizations have very interesting values concerning the positivity of the WB profiles; WHO (94.84%), CDC/ ASTPHLD (94.61%) and SFTS (93.09%). For the negative profiles, all the organizations have identical values with 3.59%. Regarding indeterminate profiles, the WHO gave the minimum of these cases (1.57%) followed by CDC / ASTPHLD (1.8%) and SFTS (3.32%). The WHO provided very interesting values for sensitivity (98.93%), specificity (91.26%), positive predictive value (99.64%) and negative predictive value (74.60%). Similarly, the CDC / ASTPHLD criteria remain favorable and are highly consistent with those of WHO (p = 0.8113). Conclusion : Sensitivity, specificity, and predictive values are characteristics of WB test that interpret the results and allow applying them to patients. In our context, it is recommended to adopt the WHO criteria to facilitate the interpretation of western blot profiles. The CDC / ASTPHLD criteria remain favorable to adoption.
PDF
