ABSTRACT
Labial ridge undercut is more commonly seen in maxilla than mandible in completely edentulous individuals and it possess a great threat to the final estheticoutcome. Construction of a labial flange in conventional manner might compromise the facial support and muscles of facial expression, limit function, and compromise aesthetics for a better prognosis, an unconventional approach is needed for the construction of complete denture. This case report describesan innovative, economical, nonsurgical treatment option for fabrication of complete denture in a patient with a prominent labial undercut to enhance the facial aesthetics of the patient.
ABSTRACT
Objetivo: avaliar, por meio de extensometria, a infl uência da flange do implante de titânio na deformação superficial do osso. Material e métodos: um bloco de poliuretano simulando um osso tipo I mais corticalizado e menos medular (40 PCF) recebeu um implante de hexágono externo intraoral, sem flange 3,75 mm x 8,5 mm (G1) e um implante de hexágono externo extraoral, com flange 3,75 mm x 8 mm (G2). Em seguida, foram instalados componentes standard com 2 mm de altura de cinta metálica e cilindros metálicos para restauração provisória. Dois extensômetros lineares foram colados na superfície do bloco (mesial e distal de cada implante), e uma carga axial de 100 Ncm em uma máquina de ensaio universal foi aplicada, com cinco medições de microdeformação (µÎµ) para cada implante. Os dados foram submetidos ao teste Shapiro-Wilk para verifi car a homogenidade dos dados e em seguida ao teste t Student. Resultados: as médias e desvios-padrão obtidos foram: G1: 148,2 ± 5,84 e G2: 92,4 ± 11,24 µÆ, com diferença estatística significativa entre os grupos. Conclusão: os implantes extraorais tiveram melhor comportamento mecânico para as cargas axiais do que os implantes intraorais, sendo que a flange melhorou a distribuição da carga na superfície do bloco de poliuretano.
Objectives: to evaluate, by means of extensometry, the influence of the titanium implant flange on the superficial deformation of the bone. Material and methods: a polyurethane block simulating a more corticalized and less spinal type I bone (40 PCF) received an external intraoral hexagon implant with a 3.75 mm x 8.5 mm fl ange (G1) and an extraoral external hexagon implant, with flange 3.75 mm x 8 mm (G2). Subsequently, standard components with 2 mm high of metal strap and metal cylinders were installed for temporary restoration. Two linear strain gauges were glued to the surface of the block (mesial and distal of each implant), and an axial load of 100N in a universal test machine was applied with five microdemorphometric measurements (µÎµ) for each implant. The data were submitted to the Shapiro-Wilks test to verify the homogeneity of the data and then to the t-student test. Results: the means and standard deviations obtained were: G1: 148.2 ± 5.84 and G2: 92.4 ± 11.24 µÎµ, with signifi cant statistical difference between the groups. Conclusion: extraoral implants had better mechanical behavior for axial loads than intraoral implants, and the flange improved the load distribution on the surface of the polyurethane block.
Subject(s)
Humans , Comparative Study , Maxillofacial Prosthesis , Maxillofacial Prosthesis Implantation , Osseointegration , Prostheses and ImplantsABSTRACT
Rehabilitation of hemimaxillectomy patients can be challenging. The most common prosthetic treatment problem with such patients is, getting adequate retention, stability and support. The size and location of the defect usually influences the amount of impairment and difficulty in prosthetic rehabilitation. Obturator prosthesis is commonly used as an effective means for rehabilitating hemimaxillectomy cases. In cases of maxillary defect, obtaining satisfactory retention, stability & biocompatibility in the definitive obturator prosthesis can be elusive. Resilient denture materials are extremely useful in retaining the prosthesis, which obturates the maxillary defects. This clinical report describes making of flexible obturator prosthesis with modified buccal flange on unresected side as a means of indirect retention. This approach provides excellent mouldability, light weight & strength of the prosthesis to increase the retention, stability and comfort.
ABSTRACT
Often the loss of the continuity of the mandible hampers the balance and the symmetry of mandibular function, leading to altered mandibular movements and deviation of the residual fragment towards the surgical side. Successful intercuspal position with the antagonist in the remainder arch was accomplished through the use of functionally moulded palatal guidance appliance in a patient who underwent hemisection and postsurgical radiation of the mandible, subsequent to treatment for a squamous cell carcinoma of right side of the ramus of mandible. This article describes the fabrication and function of a maxillary palatally positioned, functionally moulded guide flange to assist post resection physiotherapy and rehabilitation.
ABSTRACT
Background and Objectives: In complete denture wearers, the accumulation of food in the buccal vestibule is one of the factors causing discomfort to the patient. This study was conducted to evaluate the effect of mandibular denture buccal flange on food retention and to correlate between varying angulations of buccal flange of mandibular denture on food retention. Materials and Methods: Complete dentures were fabricated and the mandibular complete denture was duplicated. The existing (unduplicated) manually molded and physiologically molded dentures were tested for food retention. Twenty test particles having a diameter of 2±0.2 mm were placed on the middle part of the buccal flange and the subjects were instructed to expel the test particles by performing only functional movements of the buccal musculature. The numbers of residual test particles in the buccal vestibule were counted after 30s. The angulations of the denture buccal flange (duplicated) were measured with an optical bevel protractor and trimmed to 50° and the food retention test was performed. Similar tests were performed at 60°, 70° and 80° angulations. The data were evaluated using the Pearson correlation coefficient, One-way ANOVA test and Wilcoxon signed rank test. Results: The difference between the residual scores of manually molded and physiologically molded denture base was not significant. The difference between the residual scores at different angulations of the buccal flange of the denture was significant. Conclusion: Only the slope of the flange significantly affects the ability of subjects to expel the test particles.
Subject(s)
Acrylic Resins/chemistry , Adult , Aged , Cheek/physiology , Dental Materials/chemistry , Denture Bases , Denture Design , Denture, Complete, Lower , Facial Muscles/physiology , Female , Food , Humans , Male , Middle Aged , Surface PropertiesABSTRACT
The two—flange compression screw is a new instrument developed by us. This nail consists of two parts, the two—flange plate part and the compression screw part. We used it to treat 67 cases of femoral neck fracture, aged 39～79 years in 1988 to 1992. In the 67 cases there were 12 cases with stage Ⅰ type fracture, 14 with stage Ⅱ type fracture, 24 with stage Ⅲ type fracture and 17 with stage Ⅳ type fracture. We followed—up 42 cases for 8 months to 3 years, with result of good unjon in 38 cases (90%), avascular necrosis of the femoral head in 2 (5% ) and non—union in (5%). The biomechanical research demonstrated that the two—flange compression screw had the function of resisting rotation and section compression.