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Histological evaluation of bone formation adjacent to dental implants with a novel apical chamber design

Autores: Luiz Meirelles, PI-Branemark, Carina Johansson, Tomas Albrektsson
Revista: Clinical Implant Dentistry and Related Research.
Resumo: Purpose: Wound healing events after implant placement will vary according to the extent titanium implants with a novel apical chamber design. Materials and Methods: Titanium implants grade-IV were turned with different apex design. Control implants had a self tapping design with centric cutting grooves. Test implants exhibited eccentric cutting grooves interconnected by a hollow chamber. Implants were installed in the rabbit femur/tibia for histological analysis.
Results: After 1 week, immature bone formation started at the cortical level of the test implants associated to scalloped contours indicative higher values for test implants after 4 weeks compared to control implants.
Conclusion: This experimental study verifies the beneficial effect of bone formation in the chamber at the apical part of the fixture coupled to a faster bone healing at the bone-implant interface.



The comparative analysis of homologous fresh frozen bone and autogenous bone graft, associated or not with autogenous bone marrow, in rabbit calvaria: a clinical and histomorphometric stud

Autores: André Antonio Pelegrine, Carlos Eduardo Sorgi da Costa, Wilson Roberto Sendyk, Alfredo Gromatzky
Revista: The International Journal of Oral & Maxillofacial Implants
Resumo: This prospective randomized matched-pair controlled trial aimed to evaluate marginal bone levels and soft tissue alterations at implants restored according to the platform-switching concept with a new inward-inclined platform and compare them with external-hexagon implants.
Materials and Methods: Traditional external-hexagon (control group) implants and inward-inclined platform implants (test group), all with the same implant body geometry and 13 mm in length, were inserted in a standardized manner in the posterior maxillae of 40 patients. Radiographic bone levels were measured by two independent examiners after 6, 12, and 18 months of prosthetic loading. Buccal soft tissue height was measured at the time of abutment connection and 18 months later.
Results: After 18 months of loading, all 80 implants were clinically osseointegrated in the 40 participating patients. Radiographic evaluation showed mean bone losses of 0.5 ± 0.1 mm (range, 0.3 to 0.7 mm) and 1.6 ± 0.3 mm (range, 1.1 to 2.2 mm) for test and control implants, respectively. Soft tissue height showed a significant mean decrease of 2.4 mm in the control group, compared to 0.6 mm around the test implants.
Conclusions: After 18 months, significantly greater bone loss was observed at implants restored according to the conventional external-hexagon protocol compared to the platform-switching concept. In addition, decreased soft tissue height was associated with the external-hexagon implants versus the platform-switched implants.
Link: ncbi.nlm.nih.gov/pubmed/22848896



Inward-Inclined Implant Platform for the Amplified Platform-Switching Concept: 18-Month Follow-up Report of a Prospective Randomized Matched-Pair Controlled Tria

Autores: Luigi Canullo, Jose Carlo Rosa, Vicente Souza Pinto, Carlos Eduardo Francischone, Werner Götz
Revista: Cell Tissue Bank (2011) 12:171–184
Resumo: Abstract The aim of this study was to evaluate the potential of fresh frozen homologous and autogenous grafts, associated or not with autogenous bone marrow, to form bone. Sixty titanium cylinders were used, and were fixed to the skulls of 30 rabbits. These cylinders were filled with (A) autogenous bone (AM) autogenous bone associated with the bone marrow (H) fresh frozen homologous bone (HM) fresh frozen homologous bone associated with the bone marrow (M) pure autogenous bone marrow and (C) blood clot.
The animals were sacrificed after 02 and 03 months. After clinical evaluation, the samples were stained with hematoxylin, eosin and Mallory Trichrome dyes for optical microscopy analysis and histomorphometric analysis. Experimental groups that received mineralized materials (A, AM, H, HM) showed the best bone formation results, pre-senting no statistical difference between them (P[0.05). Groups that did not receive mineralized materials (M and C) showed the worst results (P \ 0.05), but the M group showed better results than the C group.
Most of the autogenous and homologous bone particles were resorbed and there was a larger amount of residual particles in the homologous graft (H, HM) when compared with the autogenous graft (A, AM; P \ 0.05). These findings suggest that fresh frozen homologous grafts produced similar amounts of new bone when compared with the autogenous grafts.
However, the amount of residual bone particles was larger in the homogenous groups, which may indicate a slower remodeling process. The homologous fresh frozen bone seems to be a good osteoconductive material. The use of only autogenous bone marrow showed better results when compared to the bood clot.
However, this research indicates that association with mineralized materials is required.
Link: ncbi.nlm.nih.gov/pubmed/20473718



Restoration of the Edentulous Maxilla Using Extrasinus Zygomatic Implants Combined with Anterior Conventional Implants: A Retrospective Study

Autores: Reginaldo Mário Migliorança, Abílio Coppedê, Renata C. L. Rezende, Thiago de Mayo
Revista: The International Journal of Oral & Maxillofacial Implants
Resumo: To report on the clinical outcome of 150 extrasinus zygomatic implants placed lateral to the maxillary sinus and combined with conventional implants in the anterior maxilla for the implant-supported rehabilitation of the edentulous maxilla.
Materials and Methods: All patients included in this study presented with completely or partially edentulous maxillae with any remaining teeth indicated for extraction. Indications for extractions in partially edentulous patients included longitudinal fractures, periodontal disease, endodontic failure, perforated roots, and prosthetic convenience. All patients showed severe resorption of the posterior maxilla. Each patient was treated with at least four implants, with a minimum of one zygomatic implant. No bone grafting was performed. The zygomatic implants were placed outside the sinus, lateral to the maxillary sinus. The patients were followed with standardized clinical and radiographic examinations.
Results: Seventy-five patients with severely atrophic maxillae (mean age, 52 years) were treated between 2003 and 2006. In all, 436 implants (150 zygomatic implants and 286 conventional implants) were placed. Two conventional implants failed during the study period, and two zygomatic implants were removed. All the prostheses were successful. No patients presented sinusitis. No loosened or fractured screws on any implants were recorded.
Conclusion: Extrasinus zygomatic implants, when combined with conventional implants in the anterior maxilla, represent a predictable treatment option for the atrophic edentulous maxilla. Further studies are necessary to evaluate the long-term prognosis of these implants.
Link: ncbi.nlm.nih.gov/pubmed/21691615



Carga imediata em implantes instalados em alvéolos frescos após extração de dentes posteriores sem procedimentos de enxertos e sem retalhos

Autores: Edmílson Bersani, Abílio Ricciardi Coppedê, Heloísa Helena de Paula Pinto Prata, Reginaldo Mario Miglioranca, Thiago Martins de Mayo
Revista: REVISTA IMPLANTNEWS 2010;7 (3a-PBA):73-81
Resumo: A proposta deste estudo é apresentar um protocolo para a reabilitação de perdas dentárias unitárias na região de molares, com instalação imediata de implante em alvéolo fresco pós-extração, sem procedimentos de enxerto e sem retalho, em função imediata. Os resultados clínicos obtidos indicam que este protocolo pode ser uma alternativa viável para a restauração de dentes posteriores condenados.
Link: inpn.com.br/implantnews/



Immediate Loading of Implants Placed in Fresh Extraction Sockets in the Molar Area with Flapless and Graftless Procedures: A Case Series

Autores: Edmílson Bersani, Abílio Ricciardi Coppedê, Heloísa Helena de Paula Pinto Prata
Revista: The International Journal of Periodontics & Restorative Dentistry | Volume 30, Number 3, 2010.
Resumo: The purpose of this study was to present a protocol for the replacement of single teeth lost in the molar area with immediate implantation in fresh extraction sock- ets, no flap reflections or grafting procedures, and immediate loading. Twenty- three implants were placed in 20 patients between 2000 and 2006. No implants were lost and no signs of significant bone resorption, loss of osseointegration, or soft tissue complications were reported. The results of this study indicate that this protocol may be a feasible alternative for the replacement of condemned molars.
Link: ncbi.nlm.nih.gov/pubmed/20386786



Abrasion wear resistance of different artificial teeth opposed to metal and composite antagonists

Autores: Pâmela Carbone Mello, Abílio Ricciardi Coppedê, Ana Paula Macedo, Maria da Gloria Chiarello de Mattos, Renata Cristina Silveira Rodrigues, Ricardo Faria Ribeiro
Revista: J Appl Oral Sci. 2009;17(5):451-6
Resumo: One of the most important properties of artificial teeth is the abrasion wear resistance, which is determinant in the maintenance of the rehabilitation’s occlusal pattern.
Objectives: This in vitro study aims to evaluate the abrasion wear resistance of 7 brands of artificial teeth opposed to two types of antagonists. Material and methods: Seven groups were prepared with 12 specimens each (BIOLUX – BL, TRILUX – TR, BLUE DENT – BD, BIOCLER – BC, POSTARIS – PO, ORTHOSIT – OR, GNATHOSTAR – GN), opposed to metallic (M – nickel-chromium alloy), and to composite antagonists (C – Solidex indirect composite). A mechanical loading device was used (240 cycles/min, 4 Hz speed, 10 mm antagonist course). Initial and final contours of each specimen were registered with aid of a profile projector (20x magnification). The linear difference between the two profiles was measured and the registered values were subjected to ANOVA and Tukey’s test.
Results: Regarding the antagonists, only OR (M = 10.45 ± 1.42 m and C = 2.77 ± 0.69 m) and BC (M = 6.70 ± 1.37 m and C = 4.48 ± 0.80 m) presented statistically significant differences (p < 0.05). Best results were obtained with PO (C = 2.33 ± 0.91 m and M = 1.78 ± 0.42 m), followed by BL (C = 3.70 ± 1.32 m and M = 3.70 ± 0.61 m), statistically similar for both antagonists (p>0.05). Greater result variance was obtained with OR, which presented the worse results opposed to Ni-Cr (10.45 ± 1.42 m), and results similar to the best ones against composite (2.77 ± 0.69 m).
Conclusions: Within the limitations of this study, it may be concluded that the antagonist material is a factor of major importance to be considered in the choice of the artificial teeth to be used in the prosthesis.
Link: ncbi.nlm.nih.gov/pubmed/19936525



Effect of repeated torque/mechanical loading cycles on two different abutment types in implants with internal tapered connections: an in vitro study

Autores: Abílio Ricciardi Coppedê, Maria da Glória Chiarello de Mattos, 
Renata Cristina Silveira e Rodrigues Ricardo Faria Ribeiro
Revista: Clin. Oral Impl. Res. 20, 2009 / 624–632
Resumo: Objectives: Internal tapered connections were developed to improve biomechanical properties and to reduce mechanical problems found in other implant connection systems. The purpose of this study was to evaluate the effects of mechanical loading and repeated insertion/removal cycles on the torque loss of abutments with internal tapered connections.
Material and methods: Sixty-eight conical implants and 68 abutments of two types were used. They were divided into four groups: groups 1 and 3 received solid abutments, and groups 2 and 4 received two-piece abutments. In groups 1 and 2, abutments were simply installed and uninstalled; torque-in and torque-out values were measured. In groups 3 and 4, abutments were installed, mechanically loaded and uninstalled; torque-in and torque-out values were measured. Under mechanical loading, two-piece abutments were frictionally locked into the implant; thus, data of group 4 were catalogued under two subgroups
(4a: torque-out value necessary to loosen the fixation screw; 4b: torque-out value necessary to remove the abutment from the implant). Ten insertion/removal cycles were performed for every implant/abutment assembly. Data were analyzed with a mixed linear model (P 􏰒 0.05).
Results: Torque loss was higher in groups 4a and 2 (over 30% loss), followed by group 1 (10.5% loss), group 3 (5.4% loss) and group 4b (39% torque gain). All the results were significantly different. As the number of insertion/removal cycles increased, removal torques tended to be lower. It was concluded that mechanical loading increased removal torque of loaded abutments in comparison with unloaded abutments, and removal torque values tended to decrease as the number of insertion/removal cycles increased.
Link: ncbi.nlm.nih.gov/pubmed/19281502



Estudo comparativo da dissipação de tensões em fixações zigomáticas instaladas internamente ou externamente ao seio maxilar: uma análise 3D pelo método de elementos finitos

Autores: Reginaldo Mário Migliorança, Marco Antônio Amorim Vasco, Abílio Ricciardi Coppedê, Thiago Martins de Mayo, Rodrigo Barletta S. Viterbo
Revista: REVISTA IMPLANTNEWS 2009;6(3):261-7
Resumo: The zygomatic fixtures are a valuable alternative to the maxillary reconstructions with bone grafts in the rehabilitation of severely atrophic edentulous maxillae. Modifications to the original installation technique of these fixations allowed a better positioning their emergence, favoring the prosthetic rehabilitation. Nowadays techniques internal and external to the maxillary sinus are used. The biomechanical behavior of the zygomatic fixtures under mechanichal loading remain obscure, due to the inexistence of reliable and elucidative models. This study analyzed with the finite element method the stress dissipation on zygomatic fixtures installed internally or externally to the maxillary sinus. The results showed a better stress distribution on the zygomatic fixtures installed externally to the maxillary sinus. It was concluded that the exteriorized technique provided a greater area of bone/implant contact, that the palatal emergence of the fixation on the original technique generated a higher angulation of the fixation and a greater lever arm on the prosthesis, and that low tensions are observed in the zygomatic bone in both techniques.
Link: goo.gl/nc9t4Z



Fracture Resistance of the Implant-Abutment Connection in Implants with Internal Hex and Internal Conical Connections Under Oblique Compressive Loading: An In Vitro Study

Autores: Abílio Ricciardi Coppedê, Edmilson Bersani, Maria da Gloria Chiarello de Mattos, Renata Cristina Silveira Rodrigues, Ivete Aparecida de Mattias Sartori, Ricardo Faria Ribeiro
Revista: Int J Prosthodont 2009;22:283–286.
Resumo: The objective of this study was to verify if differences in the design of internal hex (IH) and internal conical (IC) connection implant systems influence fracture resistance under oblique compressive forces. Twenty implant-abutment assemblies were utilized: 10 with IH connections and 10 with IC connections. Maximum deformation force for IC implants (90.58 ± 6.72 kgf) was statistically higher than that for IH implants (83.73 ± 4.94 kgf) (P = .0182). Fracture force for the IH implants was 79.86 ± 4.77 kgf. None of the IC implants fractured. The friction-locking mechanics and the solid design of the IC abutments provided greater resistance to deformation and fracture under oblique compressive loading when compared to the IH abutments.
Link: ncbi.nlm.nih.gov/pubmed/19548411



RM Bridge: uma nova abordagem protético reabilitadora para o tratamento dos desdentados totais

Autores: Reginaldo Mário Migliorança, Ricardo Takeshi Nagahisa, Thiago de Mayo, Rodrigo Barletta S. Viterbo, Abílio Ricciardi Coppedê, Humberto Oliveira Pinto, Sérgio Candido Dias, Gisseli Bertozzi Ávila
Revista: REVISTA IMPLANTNEWS 2007;4(2):131-7
Resumo: A RM Bridge associada ao sistema All-on-4® é uma modalidade de tratamento para o desdentado que elimina a necessidade de enxertos e permite a função imediata do paciente. Este artigo apresenta o protocolo e as particularidades da RM Bridge empregada na reabilitação de desdentados totais.
Link: implantnews.com.br/sitenovo/materia_01.asp



Reabilitação da maxila atrófica sem enxertos ósseos: resultados de um novo protocolo utilizado em casos de edentulismo total

Autores: Reginaldo Mário Migliorança, Abílio Ricciardi Coppedê, Marcelo de Sá Zamperlini, Thiago de Mayo, Rodrigo Barletta S. Viterbo, Daniela Mattar Lima
Revista: REVISTA IMPLANTNEWS 2007;4(5):557-64
Resumo: A reabilitação dos desdentados totais com próteses fixas implanto-suportadas é uma alternativa de tratamento com altos índices de sucesso e mais de 40 anos de aplicação clínica. Os procedimentos de enxertia óssea necessários nas técnicas convencionais são de alta morbidade e indesejados pelos pacientes. Esse artigo avalia os resultados clínicos obtidos com um protocolo no qual a reabilitação dos pacientes edêntulos é realizada sem a realização de enxertos ósseos, mesmo em casos de atrofia severa da maxila, através da utilização de fixações zigomáticas e implantes convencionais.
Link: goo.gl/nc9t4Z



Especialização
em Ortodontia

Ensino com enfoque nos aspectos atuais da ortodontia, diagnóstico e plano de tratamento. Saiba mais.
Especialização em Implantodontia


Um curso completo que engloba a instalação dos implantes assim como a reabilitação protética. Saiba mais.
Manobras Estéticas Com Plataforma Switching Do Sistema Straumann

Técnicas para implante com plataforma Switching. Saiba mais.

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