Research progress on the effect of implant-supported overdentures on residual ridges / 口腔疾病防治

@#With the growing maturity of implant technology, implant overdenture has gradually become a conventional repair method for edentulous patients to restore beauty and function, which improves the quality of life of edentulous patients. This paper reviews the effects of implant factors, attachment factors, occlusal factors and patients' own factors on residual alveolar ridge. Existing studies suggest that when designing denture, doctors first need to consider the oral mucosa and jaw conditions of patients before operation, and select the appropriate size of implant to ensure that sufficient bone remains around the implant; Secondly, when choosing the type of attachment, the number, location and A-P distance of implants should be fully considered, and the inclination of cusp should be properly reduced to avoid the harm of excessive lateral force to alveolar ridge; Finally, regular reexamination should be carried out after operation to maintain longer service time of denture and more sufficient bone mass of edentulous patients. However, there are many factors affecting jaw absorption. In the future, we should further explore many factors, such as patients' habit and frequency of wearing dentures, oral health and nutritional status, systemic diseases and medication.

A deviceful approach of managing hollow maxillary complete denture

Retention, stability and support are the most fundamental and basic principles on which the success of an entire denture relies on. However this factor is often compromised in cases of resorption. Residual ridge resorption is the reduction in size of the bony ridge under the mucoperiosteum. The rate of resorption in mandibular arch is at an increased rate as compared to the maxillary arch; but severely atrophic maxillae with large inter-ridge distance often pose a clinical challenge during fabrication of a successful maxillary complete denture because of the increased weight of the denture, retention is compromised. The present article describes a case of a completely edentulous patient who was successfully rehabilitated with a hollow denture where a simple and deviceful technique of fabricating a light-weight maxillary denture. The present article describes a case of a completely edentulous patient who was successfully rehabilitated with a hollow denture where a simple and deviceful technique of fabricating a light-weight maxillary denture was used using the hollow tubing of salivary ejector apparatus to bring the uniform hollowness.

Dentaduras gravitacionales inferiores: una alternativa en rebordes atróficos / Lower gravitational dentures: alternative treatment for atrophic ridges

Resumen: La estabilidad de una prótesis convencional (PC) inferior se ve afectada por una excesiva resorción mandibular; el incremento de peso de una prótesis gravitacional (PG) por su combinación metal (interno) y acrílico (externo) puede aumentarla. Objetivo: Comparar la estabilidad, desempeño masticatorio (DM), peso y percepción del paciente con reborde atrófico mandibular de PC contra PG. Material y métodos: Se solicitó el consentimiento informado en seis adultos mayores desdentados. La altura del reborde residual inferior fue medida en mm. A cada paciente se le elaboró una PC y una PG (idénticas). Se utilizó primero una y luego la otra; cada una en periodos de tiempos iguales. Al término del uso de cada prótesis se le realizó una encuesta tipo Likert y una escala visual análoga (EVA), midiendo la estabilidad clínica (escala de Woelfel), DM (tamaño medio de partícula con el alimento prueba artificial) y el peso de las prótesis (g). Se utilizó la prueba de rangos de Wilcoxon y la evaluación de correlaciones de Spearman (p = 0.05). Resultados: La prueba clínica de estabilidad resultó con diferencia significativa (p = 0.046) a favor de la PG. El análisis de las correlaciones entre variables indica que a menor movimiento mayor facilidad en el habla y la reducción del alimento. En el DM no se obtuvo diferencia estadísticamente significativa (p = 0.893). Conclusiones: A pesar de la limitación del tamaño de la muestra los resultados indican que las PG son más estables y pueden ser buena alternativa de tratamiento para pacientes con limitaciones económicas o no candidatos a cirugía.

Abstract: Stability of conventional lower prostheses (CP) is affected by excessive mandibular resorption, the greater weight of a gravitational prosthesis (GP) caused by its combination of metal (internal) and acrylic (external) can increase said stability. Objective: In patients with mandibular atrophic ridge, to compare stability, masticatory performance, weight and perception of CP in comparison with GP. Material and methods: Informed consent of six adult edentulous patients was requested. Residual lower ridge height was measured in mm. Identical CP and GP were manufactured for each patient: firstly, one was used, and then the other, each one for same periods of time. At the end of prostheses use, a Likert type survey was conducted, as well as analogous visual scale (AVS) measuring clinical stability (Woelfel scale), MP (particle mean size with artificial test foodstuff) as well as prostheses weight in grams. Wilcoxon ranking test was used as well as Spearman's correlations (p = 0.05). Results: Significant differences were found in the clinical stability test (p = 0.046) favoring GP. Correlation among variables analysis indicates that to lesser movement, greater ease for speech and food processing was found. No statistically significant difference was found in MP (p = 0.893). Conclusions: In spite of limitations imposed by sample size, results indicated that GP were more stable and could represent a suitable treatment alternative for patients who are not candidates for surgery or suffer financial limitations.

Oral rehabilitation through preventive approach: Overdenture and fenestrated denture.

Achieving excellence in aesthetics and preservation of remaining structure is the ultimate goal in preventive prosthodontic. Overdenture is a conservative and preventive approach and is essentially a preventive prosthodontic concept as it endeavours to preserve remaining teeth and thus found to be eminently suitable for treating patients with few remaining natural teeth . this case report discusses the merits of using selectively retained roots and abutments to minimize alveolar ridge resorption underneath the complete denture fabricated as maxillary overdenture and mandibular fenestrated denture.

Pontic site development and soft tissue transfer of the esthetic area: a case report / 대한치과보철학회지

Soft tissue collapse around prepared teeth and pontic is inevitable after removal of the provisional restoration during the impression taking procedures. When inserting gingival retraction cord, soft tissue is displaced to an undesired contour. Viscosity of impression material also causes gingival displacement. Therefore, the consideration to transfer the prosthetically contoured soft tissue to master cast is required, especially in the esthetic area. In this report, the methods to maintain the soft tissue contour and transfer to the mastercast will be introduced. Harmonious contour of the soft tissue can be achieved with provisional restoration and be transferred to the master cast with two different techniques mentioned in this case report.

Hollow Maxillary Denture: A Simplified Approach.

It is the dentist’s responsibility to fabricate a prosthesis incorporating stability, retention and support which ultimately provide satisfaction to the patient. But in the critical conditions such as long lip length or severely resorbed ridges with increased inter arch distance, the weight of a maxillary denture is often a dislodging factor. Hence, a light weight denture is required for better retention. This article describes a case of completely edentulous patient successfully rehabilitated with a hollow denture where a simplified technique of fabricating a light weight maxillary denture was used.

Comparación de la síntesis de interleucina- 1β por monocitos y linfocitos B estimulados con lipopolisacárido en pacientes conenfermedad periodontal / Interleukin-1β production by peripheral blood monocytes and B lymphocytes in patients with periodontal disease

Antecedentes: la interleucina-1β- (IL-1β) se considera un mediador en la pérdidaósea en enfermedad periodontal. No es claro si existen diferencias en la producciónde IL-1b ex vivo por linfocitos B (LB) y monocitos (Mo) de sangre periféricaentre pacientes sanos y con enfermedad periodontal. Objetivo: cuantificar laproducción de IL-1β por LB y Mo de sangre periférica de individuos con enfermedadperiodontal y sin esta en presencia de lipopolisacárido (LPS). Métodos: setomaron células de cinco individuos con diagnóstico sano/gingivitis, cinco conperiodontitis crónica (PC) y cinco con periodontitis agresiva (PAg). Los Mo y LB desangre periférica se purificaron con anticuerpos anti-CD14 y anti-CD19 marcadoscon perlas magnéticas. La pureza de las poblaciones celulares fue confirmadapor citometría de flujo. Las células se estimularon con LPS y la producción deIL-1b se cuantificó por ELISA. Resultados: las concentraciones basales de IL-1bproducidas por LB fueron menores en sujetos con PC comparados con sujetoscon PAg (p = 0,03) e individuos sanos (p = 0,0079). En presencia del estímulo, seincrementaron sin encontrarse diferencias entre los grupos. La IL-1b producidapor los Mo a nivel basal y frente al estímulo fue similar entre los sujetos, peromayor comparada con la liberada por los LB (p = 0,0079 en PC y p = 0,00571 en PAg)en pacientes con periodontitis. Conclusiones: la producción de IL-1b por LB enel estado basal está significativamente disminuida en pacientes con PC, comparadocon sanos y PAg, pero una vez estimulados con LPS, la respuesta es similaren los tres grupos. La capacidad de los LB para producir IL-1b en respuesta alestímulo con LPS es limitada comparada con la de los Mo...

loss in patients with periodontal disease. It is unclear whether there are differencesin the production of IL-1 b ex vivo by B cells and monocytes from peripheralblood between healthy patients and with periodontal disease. Objective:To quantify the production of IL-1b by monocytes and peripheral blood B cellsof individuals with and without periodontal disease in the presence of lipopolysaccharide(LPS). Methods: Monocytes and peripheral blood B cells from 5healthy/gingivitis, 5 chronic periodontitis (CP) and 5 aggressive periodontitis(AgP) patients were purified with anti-CD14 and anti-CD19 marked with magneticbeads. The purity of the cell populations was confirmed by flow citometry. Cellswere stimulated with LPS and the production of IL-1b was quantified by ELISA.Results: Basal levels of IL-1b produced by B lymphocytes were lower in subjectswith chronic periodontitis than in healthy (p = 0.0079) and aggressive periodontitispatients (p = 0.03). In presence of LPS, the IL-1b levels are increased withno differences between groups. IL-1b produced by monocytes at baseline andwith LPS, was similar between subjects, but higher compared to that releasedby B lymphocytes (p = 0.0079 in chronic periodontitis, p = 0.00571 in aggressiveperiodontitis) in the periodontitis groups. Conclusions: The production of IL-1bby LB at baseline is significantly reduced in CP patients compared to healthy andAgP, but once stimulated with LPS, the response is similar in the three groups.The ability of LB to produce IL-1b in response to stimulation with LPS is lowercompared with monocytes...

Prosthodontic Rehabilitation Of Mandibular Resorbed Ridge: A Different Approach.

The treatment of edentulous patient is always a challenge for the Prosthodontist. It is connected with a lot of procedures aiming to reconstruct and replace the mandible and maxilla for the patients who have lost all their remaining teeth. Treating the highly resorbed mandibular ridge accompanied with an enlarged tongue, along with the average response of the patient to all the clinical procedures, is a tedious job. The aim of this article is the prosthetic treatment of a mentally challenged patient with asymmetry of alveolar ridges, macroglossia and the difficulties related with the treatment and the suitable techniques and approaches to overcome those difficulties.

The effect of estrogen and recombine human growth hormone on residual ridge reduction in osteoporotic rats / 西安交通大学学报(医学版)

Objective To study the effect of estrogen,recombine human growth hormone and their combinations on residual ridge reduction in osteoporotic rats.Methods Animal models were established by ovariectomy and exodontia on left partial maxillary,then were devided into osteoporosis group and treatment groups;treatment groups were given estrogen and recombine human growth hormone medicial alone and their recombinations.After treatment for 4 and 8 weeks with drugs,the effects of estrogen and recombine human growth hormone on the serum tartrate-resistant acid phosphatase level and bone histomorphometry changes in maxillary were observed in each group. Results ① The serum tartrate-resistant acid phosphatase level was obvionsly lower in ERT group and Er-HGH group than in OP group(P