Full mouth rehabilitation using orthodontic treatment and implants in patient with collapsed occlusion: A case report / 대한치과보철학회지

The distance between the natural teeth and the implants is an important factor in preserving the periodontal tissues and esthetics. And abnormal positional displacement and tilting of the teeth during restorative procedure may require intentional root canal treatment and may affect masticatory function. This report is to present a successful full mouth rehabilitation of a patient with uneven dentition and collapsed occlusion using orthodontic and implant treatment. The patient had no symptoms or discomfort of temporomandibular joint disorder such as pain or sound. The orthodontic treatment was continued until implant provisional prosthesis delivery. And the vertical height of occlusion was elevated 2mm on anterior basis for anterior teeth protection and esthetics. After the orthodontic treatment, the implant abutments and natural teeth were finally restored with porcelain-fused-to-metal crowns and bridges. Satisfactory function and esthetic outcomes are observed after 6months of follow up.

Influence of abutment height and convergence angle on the retrievability of cement-retained implant prostheses with a lingual slot

PURPOSE: Cement-retained implant prostheses can lack proper retrievability during repair, and residual cement can cause peri-implantitis. The purpose of this in vitro study was to evaluate the influence of abutment height and convergence angle on the retrievability of cement-retained implant prostheses with lingual slots, known as retrievable cement-type slots (RCS). MATERIALS AND METHODS: We fabricated six types of titanium abutments (10 of each type) with two different heights (4 mm and 6 mm), three different convergence angles (8°, 10°, and 12°), a sloped shoulder margin (0.6 mm depth), a rectangular shape (6 mm × 6.5 mm) with rounded edges, and a rectangular ledge (2 mm × 1 mm) for the RCS. One monolithic zirconia crown was fabricated for each abutment using a dental computer-aided design/computer-aided manufacturing system. The abutments and crowns were permanently cemented together with dual-curing resin cement, followed by 24 hours in demineralized water at room temperature. Using a custom-made device with a slot driver and torque gauge, we recorded the torque (N·cm) required to remove the crowns. Statistical analysis was conducted using multiple regression analysis and Mann-Whitney U tests (α=.05). RESULTS: Removal torques significantly decreased as convergence angles increased. Multiple regression analysis showed no significant interaction between the abutment height and the convergence angle (Durbin-Watson ratio: 2.186). CONCLUSION: Within the limitations of this in vitro study, we suggest that the retrievability of cement-retained implant prostheses with RCS can be maintained by adjusting the abutment height and convergence angle, even when they are permanently cemented together.

Accuracy of several implant bite registration techniques: an in-vitro pilot study

PURPOSE: This study evaluated the accuracies of different bite registration techniques for implant-fixed prostheses using three dimensional file analysis. MATERIALS AND METHODS: Implant fixtures were placed on the mandibular right second premolar, and the first and second molar in a polyurethane model. Aluwax (A), Pattern Resin (P), and Blu-Mousse (B) were used as the bite registration materials on the healing abutments (H) or temporary abutments (T). The groups were classified into HA, HP, HB, TA, TP, and TB according to each combination. The group using the bite impression coping was the BC group; impression taking and bite registration were performed simultaneously. After impression and bite taking, the scan bodies were connected to the lab analogs of the casts. These casts were scanned using a model scanner. The distances between two reference points in three-dimensional files were measured in each group. One-way ANOVA and Duncan's test were used at the 5% significance level. RESULTS: The smallest distance discrepancy was observed in the TB group using the temporary abutments. The Blu-Mousse and HP groups showed the largest distance discrepancy. The TB and BC groups showed a lower distance discrepancy than the HP group (P=.001), and there was no significant difference between the groups using the temporary abutments and healing abutments (P>.05). CONCLUSION: Although this study has limitations as an in-vitro investigation, the groups using the temporary abutments to hold the Blu-Mousse record and bite impression coping showed greater accuracy than the group using the healing abutments to hold the pattern resin record.

Aspectos epidemiológicos das infecções de sítio cirúrgico em pacientes submetidos a cirurgias ortopédicas com implantes / Epidemiological aspects of surgical site infections in patients undergoing orthopedic surgery with implants

A Infecção do Sítio Cirúrgico relacionada aos procedimentos ortopédicos constitui complicação grave, pois pode prolongar o tempo de internação do paciente, dobrar as taxas de re-hospitalização, aumentar os custos com a assistência e reduzir a qualidade de vida destes pacientes. O fato de existir infecções evitáveis, exige da equipe de saúde e das instituições, a prevenção destas infecções. Para se reduzir as taxas se faz necessário conhecer a sua real incidência e seus fatores de risco. O objetivo geral deste estudo é avaliar os aspectos epidemiológicos das infecções de sítio cirúrgico nos pacientes submetidos a cirurgias ortopédicas com implantes, em um hospital geral, privado de Contagem - Minas Gerais - MG. Utilizou-se metodologia do National Healthcare Safety Network/ Centers for Disease Control and Prevention. Trata-se de uma coorte histórica, com uma amostra de 178 pacientes, para a análise descritiva foi usada frequência simples e medidas de tendência central como média, mediana e de variabilidade como desvio-padrão. Para verificar a associação entre fatores de risco foi realizada a análise univariada de todas as variáveis do banco, através da regressão logística. As variáveis que apresentaram valor de p maior ou igual a 0,05 na análise univariada foram elegíveis para comporem a análise multivariada. Iniciou-se com a construção do modelo cheio e as variáveis foram retiradas passo a passo até a definição do modelo final. Para a definição do melhor modelo final foi utilizado odds ratio e o valor p < 0,05. A população foi caracterizada por maioria do sexo masculino, predominância de adultos. Foram notificadas nove (09) ISCs com taxa global de 5,06%. A incidência por procedimento foi: 2,8% em redução aberta de fratura, 5,6% em artroplastia total de joelho, 1,68 % em artroplastia total de quadril e nenhum registro em cirurgia de fusão espinhal. O Staphylococcus aureus foi o agente etiológico isolado...

The Surgical Site Infection related to orthopedic procedures is a serious complication as it can prolong the patient's hospital stay, bend the re-hospitalization rates increase the cost of care and reduce the quality of life of these patients. The fact that there preventable infections, demands that health staff and institutions, the prevention of these infections. To reduce the rates it is necessary to know its true incidence and risk factors. The aim of this study is to evaluate the epidemiological aspects of surgical site infections in patients undergoing orthopedic surgery with implants, in general, private hospital in Contagem - Minas Gerais - MG. We used the methodology of the National Healthcare Safety Network / Centers for Disease Control and Prevention. This is a historical cohort study with a sample of 178 patients for the descriptive analysis was used simple frequency and central tendency measures like mean, median and variability as the standard deviation. To determine the association between risk factors was performed univariate analysis of all the variables of the bank, through logistic regression. The variables with p value greater than or equal to 0.05 in the univariate analysis were eligible to compose the multivariate analysis. It began with the construction of the full model and the variables were taken step by step to the definition of the final model. To define the best final model was used odds ratio and the value p <0.05. The population was characterized by mostly male, predominantly adults. They were notified nine (09) ISCs with overall rate of 5.06%. The incidence per procedure was: 2.8% in open reduction of fracture, 5.6% in total knee arthroplasty, 1.68% in total hip arthroplasty and no record in spinal fusion surgery. Staphylococcus aureus was isolated etiologic agent. The final adjustment of the multivariate model defined as risk factors for infection in orthopedic surgery to...