ABSTRACT
BACKGROUND: Implant denture is a kind of dental restoration with excellent retention, support and stability. However, the phenomenon of dental fillings after implantation is a common phenomenon that troubles the majority of patients with dental defects. OBJECTIVE: The finite element analysis method was used to analyze the food impaction after planting denture by biomechanical numerical simulation, and find the quantitative relationship between the food impaction and relative width, relative height, relative angle of the denture. METHODS: To study fully relative teeth under the conditions of different widths, heights and angles influence on food embedded plug, we designed different width groups of the upper structure of the denture (5 subgroups: 5.6, 5.7, 5.8, 5.9, 6.0 mm), different height groups of the upper structure of the denture (5 subgroups: 6.6, 6.8, 7.0, 7.2, 7.4 mm), different planting angle groups of the denture (5 subgroups: 92°, 91°, 90°, 89°, 88°), different width groups of natural crowns (5 subgroups: 5.6,5.7, 5.8, 5.9, 6.0 mm), different height groups of natural crowns (5 subgroups: 6.6, 6.8, 7.0, 7.2, 7.4 mm), and different natural tooth growth angle groups (5 subgroups: 92°, 91°,90°, 89°, 88°) as a 4-teeth partial denture model. Each subgroup was designed by changing the relative position of the third dental component, with the same remaining conditions. The numerical simulation of food impaction was carried out for all dentition models, and the deformation of the teeth was analyzed. The tooth gap width curves were compared before and after stress between each group. RESULTS AND CONCLUSION: (1) After force, the total horizontal displacement of the denture was slowly reduced with the increase of the width of the upper part of the denture. When the width of the upper structure was between 5.9 and 6.0 mm, the interdental space of the natural tooth was rapidly reduced after the deformation of the tooth. The effect of food impaction was closer to the food impaction condition in the case of natural teeth. (2) When the height of the upper structure of the denture was lower than that of the adjacent teeth, with the increase of the height of the upper structure of the denture, the gap between the teeth increased first and then decreased. When the denture was lower than the adjacent tooth and the height was between 6.8 and 7.0 mm, the tooth space decreased rapidly after the force was applied. (3) The total horizontal displacement decreased slowly with increasing planting angle. (4) The results show that to reduce food impaction, the interdental distance of the implant denture and adjacent teeth should be less than 0.05 mm. The height of the implant denture should be less about 0.2 mm than adjacent teeth, and the planting angle should be about 90°.
ABSTRACT
Prosthetic rehabilitation can generate doubts among professionals regarding the type of material to choose when planning rehabilitation treatments. The establishment of reliable criteria for material selection raises frequent questions. This work presents a concept and an alternative and simplified proposal to paradigm shift in therapeutic approaches based on three trends in restorative dentistry: Biomimetics, the use of natural tissue as a restorative material, which offers potential for the recovery of the mechanical, aesthetic and biological properties of teeth; digital dentistry and CAD/CAM systems; and adhesive technology, which has undergone exponential and impressive advances. However, further studies are needed to evaluate the long-term performance of restorations in this variable field. (AU)
Muitas dúvidas surgem quanto ao tipo ideal de material restaurador a ser escolhido durante a elaboração do planejamento em tratamentos reabilitadores. Determinar critérios seguros para seleção do material são questionamentos frequentes. Este trabalho apresenta, por meio de um caso clínico, um conceito: restaurações biológicas e uma proposta alternativa e simplificada para quebrar paradigmas quanto a novas abordagens terapêuticas com as três tendências da Odontologia Restauradora Moderna: Biomimética mimetizar e/ou utilizar o tecido natural dental como o material restaurador, com potencial de recuperar as propriedades mecânicas, estéticas e biológicas dos dentes danificados, a Odontologia digital e Sistemas CAD/CAM - com avanços exponenciais e a consagrada tecnologia adesiva. Porém mais estudos ainda são necessários para avaliar o desempenho a longo prazo dessas restaurações neste vasto campo de variabilidades. (AU)
Subject(s)
Tooth , Metal Ceramic Alloys , Computer-Aided Design , Biomimetics , Mouth RehabilitationABSTRACT
Facial trauma resulting in tooth avulsion results in problems of physical and emotional nature for the patient, parent and a challenge for the dentist. Avulsion accounts for 0.5–16% of traumatic injuries in the permanent dentition which can occur at any age and is most common in the young permanent dentition and in the maxillary anterior region. Re-implantation of the avulsed tooth is the preferred emergency treatment depending on the extra-alveolar period and the storage medium used. The biggest advantage of immediate re-implantation is the psychological boost to the child of retaining his/her own natural teeth. A case report of 13 year old female patient with a history of trauma to the anterior region of maxilla and avulsion of 3 anterior teeth is discussed. An interim fixed partial denture was delivered using patient’s avulsed natural teeth in a single appointment.
ABSTRACT
Introduction: In patients with hopeless prognosis of the anterior teeth there is still a strong desire to save them for the sake of esthetics. If not grossly carious, broken down or discolored the extracted tooth after suitable modifications can be placed back in its original site by splinting it to the adjacent stable teeth. Materials and Methods: Fifteen patients (10 males, 5 females) in the age range of 40-65 years with pathologically migrated, unsalvageable teeth were treated by splinting the extracted teeth immediately with the stable adjacent teeth. After 12 weeks, all the patients were explained various treatment options available for replacement of the lost teeth. The patients were asked to fill out a simple closed ended questionnaire citing the various difficulties encountered during this transitional period, selection of further treatment modalities and the reasons for their choice. The feedback obtained was then analyzed statistically. Results: Hundred percent of patients were happy with the esthetics; however, 60% of them were dissatisfied with the function that it provided. The primary problem being apprehension of splint fracture and difficulty while incising and the data was found to be statistically significant (P=0.01**). All patients demanded a permanent treatment option following this with a fixed prosthesis. None of the patients were interested in the implant supported prosthesis due to cost, treatment time involved, and need for surgery. Conclusion: The concept of immediate pontic placement is surely a viable treatment option and promises an excellent transient esthetic solution for a lost tooth as well as enables good preparation of the extraction site for future prosthetic replacement.