Traumatic ulcerative granuloma with stromal eosinophilia around mini dental implants without the protection of a denture base.

This is a report of a case of an unusual oral lesion after the placement of mini implants for the retention of a mandibular overdenture. A patient received four 2-mm-wide dental implants in the anterior mandible and had her mandibular denture relined with a soft material. After 3 months, she was not wearing her mandibular denture, and two nodular ulcerated lesions were observed near the mini implants. The lesions ceased following excision and regular denture wearing. Clinical and microscopic examination led to the diagnosis of traumatic ulcerative granuloma with stromal eosinophilia (TUGSE). TUGSE is rare lesion with a benign course that may occur following injury of the oral mucosa by mini implants under certain circumstances.

A randomized trial on simplified and conventional methods for complete denture fabrication: cost analysis.

PURPOSE: This study aimed to quantify the costs of complete denture fabrication by a simplified method compared with a conventional protocol. MATERIALS AND METHODS: A sample of edentulous patients needing conventional maxillary and mandibular complete dentures was randomly divided into group S, which received dentures fabricated by a simplified method, and group C, which received conventionally fabricated dentures. We calculated direct and indirect costs for each participant including unscheduled procedures. This study assessed 19 and 20 participants allocated into groups S and C, respectively, and comparisons between groups were conducted by the Mann-Whitney and Student's t-test (α = 0.05). RESULTS: Complete denture fabrication demanded median time periods of 173.2 and 284.5 minutes from the operator for groups S and C respectively, and 46.6 and 61.7 minutes from the dental assistant (significant differences, p < 0.05). There was no difference between groups regarding postinsertion adjustments. Group S showed lower values for costs with materials and time spent by patients than group C during the fabrication stage, but not during adjustments. CONCLUSIONS: The median direct cost of complete denture treatment was 34.9% lower for the simplified method. It can be concluded that the simplified method is less costly for patients and the health system when compared with a conventional protocol for the rehabilitation of edentulous patients.

The effect of polymerization cycles on color stability of microwave-processed denture base resin.

PURPOSE: This study evaluated the effect of different microwave polymerization cycles on the color changes of a microwave-processed denture base resin after accelerated aging and immersion in beverages. MATERIALS AND METHODS: Specimens of light pink acrylic resin were divided into three groups according to polymerization cycle: (A) 500 W for 3 minutes, (B) 90 W for 13 minutes + 500 W for 90 seconds, and (C) 320 W for 3 minutes + 0 W for 4 minutes + 720 W for 3 minutes. Control groups were a heat-processed acrylic resin (T) and a chemically activated denture repair resin (Q). Eight specimens per group were aged in an artificial aging chamber and evaluated at 20, 192, and 384 hours. Another series of 40 specimens per group were immersed in water, coffee, tea, cola, or red wine and evaluated at 1, 12, and 36 days. Color was measured by a spectrophotometer before and after aging or immersion. Color changes (DeltaE) were analyzed by ANOVA/Bonferroni t-test (alpha = 0.05). RESULTS: Mean DeltaE (+/- SD) after 384 hours of accelerated aging were (A) 2.51 +/- 0.50; (B) 3.16 +/- 1.09; (C) 2.89 +/- 1.06; (T) 2.64 +/- 0.34; and (Q) 9.03 +/- 0.40. Group Q had a significantly higher DeltaE than the other groups. Color changes of immersed specimens were significantly influenced by solutions and time, but the five groups showed similar values. Mean DeltaE at 36 days were (water) 1.4 +/- 0.8; (coffee) 1.3 +/- 0.6; (tea) 1.7 +/- 0.5; (cola) 1.4 +/- 0.7; and (red wine) 10.2 +/- 2.7. Results were similar among the five test groups. CONCLUSIONS: Color changes of the microwave-polymerized denture base resin tested were not affected by different polymerization cycles after accelerated aging or immersion in beverages. These changes were similar to the conventional heat-polymerized acrylic resin test, but lower than the repair resin after accelerated aging.

Comparing a tablet computer and paper forms for assessing patient-reported outcomes in edentulous patients.

PURPOSE: The aim of this study was to determine whether two methods of documentation, print and electronic forms, for the assessment of patient-reported outcomes (PRO) in complete denture wearers provide comparable results. The study also quantified the time needed for filling the forms by each method. MATERIALS AND METHODS: Thirty participants enrolled in a university clinic answered two forms (a questionnaire for denture satisfaction and OHIP-EDENT). They provided answers with two application methods in a random order, with a one-month interval between them: (1) electronic forms on a tablet computer; and (2) print forms. The methods were compared in terms of mean results, correlation/agreement, internal consistency, and spent time. RESULTS: Mean results for both methods were similar for each denture satisfaction item (100-mm VAS) and OHIP-EDENT summary score. Both questionnaires presented good internal consistency regardless of the application method (Cronbach's α=0.86 or higher). Correlation and agreement between the methods regarding specific items was at least moderate for the majority of cases. Mean time for the electronic and print forms were 9.2 and 8.5 minutes, respectively (paired t test, P=.06, non-significant). CONCLUSION: The electronic method is comparable to print forms for the assessment of important PRO of prosthetic treatment for edentulism, considering the results and time needed. Findings suggest the viability of replacing print forms with a tablet for applying the tested inventories in clinical trials.

Preliminary In Vitro Study on O-Ring Wear in Mini-Implant-Retained Overdentures.

This preliminary in vitro study evaluated the simulated retention force of O-rings used for mini-implant overdenture treatment and the effect of mechanical fatigue corresponding to 6 months of wear. A mandibular overdenture analog device was attached to two mini-implants and underwent a tensile strength test before and after the application of insertion-removal and simulated masticatory cycles. Insertion-removal cycles led to a retention loss of 24%, whereas masticatory cycles did not influence retention. Micro-CT scans showed minor deformation following mechanical cycling, but the changes were milder than those observed in similar clinical specimens. Both experimental loading methods led to physical changes in the O-rings, which explains in part the similar clinically observed wear.

Implant osseointegration in circumferential bone defects treated with latex-derived proteins or autogenous bone in dog's mandible.

BACKGROUND: In sites with diminished bone volume, the osseointegration of dental implants can be compromised. Innovative biomaterials have been developed to aid successful osseointegration outcomes. PURPOSE: The aim of this study was to evaluate the osteogenic potential of angiogenic latex proteins for improved bone formation and osseointegration of dental implants. MATERIALS AND METHODS: Ten dogs were submitted to bilateral circumferential defects (5.0 × 6.3 mm) in the mandible. Dental implant (3.3 × 10.0 mm, TiUnite MK3™, Nobel Biocare AB, Göteborg, Sweden) was installed in the center of the defects. The gap was filled either with coagulum (Cg), autogenous bone graft (BG), or latex angiogenic proteins pool (LPP). Five animals were sacrificed after 4 weeks and 12 weeks, respectively. Implant stability was evaluated using resonance frequency analysis (Osstell Mentor, Osstell AB, Göteborg, Sweden), and bone formation was analyzed by histological and histometric analysis. RESULTS: LPP showed bone regeneration similar to BG and Cg at 4 weeks and 12 weeks, respectively (p ≥ .05). Bone formation, osseointegration, and implant stability improved significantly from 4 to 12 weeks (p ≤ .05). CONCLUSION: Based on methodological limitations of this study, Cg alone delivers higher bone formation in the defect as compared with BG at 12 weeks; compared with Cg and BG, the treatment with LPP exhibits no advantage in terms of osteogenic potential in this experimental model, although overall osseointegration was not affected by the treatments employed in this study.

Influence of incorporation of fluoroalkyl methacrylates on roughness and flexural strength of a denture base acrylic resin.

Fluorinated denture base acrylic resins can present more stable physical properties when compared with conventional polymers. This study evaluated the incorporation of a fluoroalkyl methacrylate (FMA) mixture in a denture base material and its effect on roughness and flexural strength. A swelling behavior assessment of acrylic resin specimens (n=3, per substance) after 12 h of FMA or methyl methacrylate (MMA) immersion was conducted to determine the solvent properties. Rectangular specimens (n=30) were allocated to three groups, according to the concentration of FMA substituted into the monomer component of a heat-polymerized acrylic resin (Lucitone 550), as follows: 0% (control), 10% and 20% (v/v). Acrylic resin mixed with concentrations of 25% or more did not reach the dough stage and was not viable. The surface roughness and flexural strength of the specimens were tested. Variables were analyzed by ANOVA and Tukey's test (alpha=0.05). Immersion in FMA produced negligible swelling, and MMA produced obvious swelling and dissolution of the specimens. Surface roughness at concentrations of 0%, 10% and 20% were: 0.25+/-0.04, 0.24+/-0.04, 0.22+/-0.03 microm (F=1.78; p=0.189, not significant). Significant differences were found for flexural strength (F=15.92; p<0.001) and modulus of elasticity (F=7.67; p=0.002), with the following results: 96+/-6, 82+/-5, 84+/-6 MPa, and 2,717+/-79, 2,558+/-128, 2574+/-87 MPa, respectively. The solvent properties of FMA against acrylic resin are weak, which would explain why concentrations over 20% were not viable. Surface changes were not detected after the incorporation of FMA in the denture base acrylic resin tested. The addition of FMA into denture base resin may lower the flexural strength and modulus of elasticity, regardless of the tested concentration.

Método simplificado versus convencional de confecção de próteses totais: práticas adotadas pelos Cirurgiões-Dentistas / Simplified versus conventional method for the fabrication of complete dentures: procedures adopted by dentists

Introdução: A fim de reduzir custos e tempo clínico envolvidos com o tratamento, Dentistas têm utilizado métodos simplificados, omitindo ou abreviando partes da técnica de confecção das próteses totais. Objetivo: Levantar as práticas utilizadas pelos Cirurgiões-Dentistas para a confecção de próteses totais. Material e método: Os dados foram levantados por meio de um formulário eletrônico contendo perguntas relativas ao perfil e aos procedimentos clínicos utilizados, a fim de quantificar o uso de métodos simplificados e convencionais, bem como para determinar a relação com o perfil desses profissionais. Os resultados foram analisados por meio de análise de Aglomerados. Resultado: As respostas foram dadas, em sua maioria, por homens, tendo a prática clínica como sua principal fonte de renda e clínica privada ou conveniada como ambiente principal de trabalho (n=119). Grande parte dos entrevistados relatou realizar duas moldagens por arcada, utilização de articulador semiajustável com arco facial, determinação de plano oclusal por meio de guias anatômicos, utilização de meios métricos para análise da dimensão vertical de oclusão e determinação direta da relação cêntrica. O próprio Cirurgião-Dentista relatou ser o responsável na fase de seleção de dentes. A estatística identificou dois Aglomerados, com base nas características demográficas e na prática clínica, sendo um grupo formado por generalistas adeptos de perfis mais simplificados e outro formado por profissionais mais especializados em prótese que realizam técnicas convencionais. Conclusão: A adoção de técnicas simplificadas é associada àqueles Dentistas com perfil mais generalista, ...

Introduction: In order to reduce costs and clinical time involved with complete denture treatment, dentists have employed simplified methods based on the reduction or preclusion of certain traditional technical procedures. Purpose: To survey the procedures used by dentists to fabricate complete dentures. Material and method: Data was obtained by an electronic form containing questions about dentists' profile and clinical procedures, in order to quantify traditional and simplified approaches at several moments and to determine them to different professional profiles. Results were evaluated by means of cluster analysis. Result: The majority of respondents were male dentists with clinical practice as their main income source, mainly in private service (n=119). Most participants use to take a pair of impressions from each arch, employ semiadjustable articulators with facebow transfers, shape the occlusal plane with the aid of anatomic references, determine occlusal vertical dimension by metric methods and use mandibular manipulation for centric relation. The dentists performed tooth selection in most cases. Statistical analysis identified two clusters based on demographic characteristics and clinical procedures. General practitioners adopting simplified methods formed the first cluster, whereas prosthodontists used to conventional methods formed the second. Conclusion: General dentists tend to adopt simplified approaches, and prosthodontists tend to work according to traditional academic methods. .

Influence of incorporation of fluoroalkyl methacrylates on roughness and flexural strength of a denture base acrylic resin

Fluorinated denture base acrylic resins can present more stable physical properties when compared with conventional polymers. This study evaluated the incorporation of a fluoroalkyl methacrylate (FMA) mixture in a denture base material and its effect on roughness and flexural strength. A swelling behavior assessment of acrylic resin specimens (n=3, per substance) after 12 h of FMA or methyl methacrylate (MMA) immersion was conducted to determine the solvent properties. Rectangular specimens (n=30) were allocated to three groups, according to the concentration of FMA substituted into the monomer component of a heat-polymerized acrylic resin (Lucitone 550), as follows: 0 percent (control), 10 percent and 20 percent (v/v). Acrylic resin mixed with concentrations of 25 percent or more did not reach the dough stage and was not viable. The surface roughness and flexural strength of the specimens were tested. Variables were analyzed by ANOVA and Tukey's test (a=0.05). Immersion in FMA produced negligible swelling, and MMA produced obvious swelling and dissolution of the specimens. Surface roughness at concentrations of 0 percent, 10 percent and 20 percent were: 0.25 ± 0.04, 0.24 ± 0.04, 0.22 ± 0.03 mm (F=1.78; p=0.189, not significant). Significant differences were found for flexural strength (F=15.92; p<0.001) and modulus of elasticity (F=7.67; p=0.002), with the following results: 96 ± 6, 82 ± 5, 84 ± 6 MPa, and 2,717 ± 79, 2,558 ± 128, 2574 ± 87 MPa, respectively. The solvent properties of FMA against acrylic resin are weak, which would explain why concentrations over 20 percent were not viable. Surface changes were not detected after the incorporation of FMA in the denture base acrylic resin tested. The addition of FMA into denture base resin may lower the flexural strength and modulus of elasticity, regardless of the tested concentration.

Solução implantossuportada individualizada após agenesia do incisivo lateral e mesialização do canino superior: pilar de zircônia e coroa cerâmica cimentada para pacientes jovens / A customized, implant-supported solution after lateral incisor agenesis and canine orthodontic mesialization: zirconia abutment and cemented ceramic crown for young patients

A reposição de um incisivo lateral superior ausente pode representar um verdadeiro desafio estético. Dentre as opções disponíveis, a instalação de uma prótese unitária implantossuportada proporciona bons resultados, tanto esteticamente, quanto funcionalmente. Assim, o objetivo deste artigo foi apresentar um caso clínico, no qual um paciente com agenesia do incisivo lateral superior teve a reposição deste dente, através de prótese unitária implantossuportada com conexão protética cone-morse e pilar estético de zircônia. Como resultado, foi obtida uma restauração que supriu as necessidades estéticas e funcionais de um paciente jovem.

The replacement of a missing upper lateral incisor can be a real esthetic challenge. Among the available options, the insertion of a single implant-supported prosthesis can provide good results, both aesthetically and functionally. Thus, the purpose of this study is to present a case in which a patient with agenesis of upper lateral incisor received a Cone-Morse connection design with a screwed zirconia abutment and a final cemented crown. In this way, both funcional and esthetic demands were addressed for this young patient.