Resonance Frequency Analysis of Dental Implants With 2 Types of Surface Treatment Submitted to Immediate Loading: A Prospective Clinical Study.

BACKGROUND: Characteristics of the implant surface may benefit osseointegration, and the knowledge of this process in diverse clinical situations may play a role in implant dentistry practice. PURPOSE: The aim of the present study was to compare the stability of dental implants with different types of surface treatment. MATERIALS AND METHODS: Fifty-five implants were placed in the mandibles of 11 fully edentulous patients. Group 1 (G1) consisted of 27 implants with a hydrophilic surface. Group 2 (G2) consisted of 28 implants (double sandblasting and acid etching). Implants were distributed randomly; equal surfaces were not placed contiguously. Measurements were taken after surgery (baseline) and 10, 30, 60, and 90 days, 4 and 8 months after surgery. Resonance frequency analysis (RFA) was used for determining the stability. RESULTS: No statistically significant differences were found. The largest difference in implant stability quotient (ISQ) between groups occurred at the first evaluation (ISQ ≈ 69.8 in G1 and ≈ 68.4 in G2). Reductions in stability were more accentuated in the first month, returning to values similar to baseline in the subsequent months, with peak stability reached at 8 months (ISQ ≈ 69.8 in G1 and ≈ 69.8 in G2). CONCLUSION: No statistically significant differences were found in the stability of the implants placed in edentulous mandibular arch, submitted to immediate loading analyzed using RFA.

Análise do desvio angular pelo escaneamento a laser de modelos, antes e após cirurgia guiada flapless na arcada maxilar edêntula: estudo in vitro com um sistema comercialmente disponível / Analysis of angular deviation by laser scanning of plaster models before and after flapless guided surgery in edentulous maxillary arches: in vitro study with a commercially available system

Objetivo: este estudo foi idealizado com a finalidade de comparar as posições dos análogos em modelos de gesso, obtidos antes e após o procedimento cirúrgico de instalação dos implantes, em dez casos clínicos. Material e métodos: foram selecionados dez guias prototipados de maxilas edêntulas, que já haviam sido utilizados para a instalação guiada de implantes e que já estavam com as próteses instaladas. Cilindros posicionadores de análogos de minipilar foram adaptados para obtenção dos modelos de gesso pré-cirúrgicos (modelo 1). Também foram reunidos os modelos dos casos que haviam sido obtidos através da moldagem realizada em boca após a instalação dos intermediários (modelo 2). Todos foram submetidos a escaneamento a laser, e a comparação entre os modelos foi realizada virtualmente com um software específico. Os dados foram analisados estatisticamente utilizando o teste de Wilcoxon (p < 0,05). Resultados: foi encontrada uma média de desvio angular de 3,17o ± 1,78o (p=0,000). A média do desvio angular encontrada na comparação entre os dois modelos avaliados foi semelhante a desvios encontrados na literatura. Conclusão: técnicas como a da adaptação passiva devem ser utilizadas com o objetivo de compensar tais desvios e facilitar o procedimento técnico laboratorial, entregando a prótese final em menos tempo.

Objective: this study compared the positions of the analogs in plaster models obtained before and after implant placement in 10 clinical cases. Material and methods: ten CAD/CAM surgical guides for maxillary edentulous patients were selected and which had already been used for the guided implant placement and with the final prosthesis already fabricated. To generate the pre-surgical cast model (model 1), mini conical replicas were mounted on the guiding sleeves using cylinder positioners. The models obtained through an impression after the surgical procedures were also analyzed (model 2). Each plaster model was subjected to laser scanning and the comparison between models was performed in specialized software. The statistical analyses were performed using Wilcoxon test (p < 0.05). Results: a mean angular deviation of 3.17o ± 1.8o (p=0.000) was found. The average angular deviation found in the comparison between the two models evaluated was similar to deviations in the literature. Conclusion: techniques such as passive adaptation, must be used in order to compensate the deviations and improve laboratory procedures, speeding the final denture delivery in less time.

Elevação do seio maxilar com enxerto autógeno e instalação imediata de implante: quatro anos de acompanhamento / Maxillary sinus floor augmentation using autogenous bone graft and immediate implant installation: a case report with 4 years of follow-up

Introdução: a reabilitação das áreas posteriores da maxila, severamente reabsorvidas, com implantes osseointegráveis, são consideradas como um desafio ao cirurgião devido à reabsorção óssea e ao aumento na pneumatização do seio maxilar. Neste contexto, a elevação do seio maxilar utilizando substitutos ósseos se mostra como um procedimento efetivo para a reabilitação destas regiões. Objetivo e Métodos: O objetivo deste caso clínico foi relatar a elevação do seio maxilar com enxerto autógeno seguido pela instalação imediata de implante com acompanhamento de 4 anos. Além disso, as técnicas cirúrgicas bem como as indicações pertinentes foram abordadas em relação à utilização dos substitutos ósseos e instalação imediata dos implantes. Discussão e Conclusões: com base na literatura e nos resultados clínicos descritos neste relato de caso, esta técnica pode ser considerada como uma alternativa viável para a reabilitação de regiões posteriores da maxila severamente reabsorvidas com implantes osseointegráveis.

Introduction: implant-supported restorations in the atrophic posterior maxillary region has been considered as a challenge because of the alveolar bone resorption and increased pneumatization of the maxillary sinus. In this context, it is well established that maxillary sinus floor augmentation is an effective procedure for rehabilitation of these regions. Objective and Methods: the objective of this study was to describe a case report related to maxillary sinus floor augmentation procedure using autogenous bone graft followed by immediate implant installation with 4 years follow-up. Moreover, surgical techniques and the putative indications are discussed considering the applicability of bone substitutes and immediate implant installation. Results and Conclusion: based on the literature and clinical findings of this case report, this technique can be considered as a viable alternative for the implant-supported rehabilitation of the atrophic posterior maxillary regions.