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Osseointegration of implants with dendrimers surface characteristics installed conventionally or with Piezosurgery®. A comparative study in the dog

Bengazi, Franco; Lang, Niklaus P.; Canciani, Elena; Viganò, Paolo; Velez, Joaquin Urbizo; Botticelli, Daniele
Fonte: Universidade Estadual Paulista Publicador: Universidade Estadual Paulista
Tipo: Artigo de Revista Científica
ENG
Relevância na Pesquisa
16.95%
Aim: The first aim of the present experiment was to compare bone healing at implants installed in recipient sites prepared with conventional drills or a piezoelectric device. The second aim was to compare implant osseointegration onto surfaces with and without dendrimers coatings. Material and Methods: Six Beagles dogs were used in this study. Five implants with two different surfaces, three with a ZirTi® surface (zirconia sand blasted, acid etched), and two with a ZirTi®-modified surface with dendrimers of phosphoserine and polylysine were installed in the right side of the mandible. In the most anterior region (P2, P3), two recipient sites were prepared with drills, and one implant ZirTi® surface and one coated with dendrimers implants were installed at random. In the posterior region (P4 and M1), three recipient sites were randomly prepared: two sites with a Piezosurgery® instrument and one site with drill and two ZirTi® surface and one coated with dendrimers implants installed. Three months after the surgery, the animals were sacrificed for histological analysis. Results: No complications occurred during the healing period. Three implants were found not integrated and were excluded from analysis. However, n = 6 was obtained. The distance IS-B at the buccal aspect was 2.2 ± 0.8 and 1.8 ± 0.5 mm...

Influence of presence or absence of keratinized mucosa on the alveolar bony crest level as it relates to different buccal marginal bone thicknesses. an experimental study in dogs

Bengazi, Franco; Botticelli, Daniele; Favero, Vittorio; Perini, Alessandro; Urbizo Velez, Joaquin; Lang, Niklaus P.
Fonte: Universidade Estadual Paulista Publicador: Universidade Estadual Paulista
Tipo: Artigo de Revista Científica
ENG
Relevância na Pesquisa
16.95%
Objective: To investigate the influence of the presence or absence of keratinized mucosa on the alveolar bony crest level as it relates to different buccal marginal bone thicknesses. Material and methods: In six beagle dogs, the mandibular premolars and first molars were extracted bilaterally. In the right side of the mandible (test), flaps were elevated, and the buccal as well as part of the lingual masticatory mucosa was removed. The flap was released coronally to allow a primary wound closure. In the left side, the wounds were left unsutured with the keratinized mucosa remaining (control). After 3 months of healing, a complete absence of keratinized mucosa was found at the test sites. Two recipient sites were prepared at each side of the mandible, one in the premolar and one in the molar region. A buccal bony ridge width of approximately 1 and 2 mm was obtained at the premolar and molar region, respectively. Implants were installed with the shoulder flush with the buccal alveolar bony crest, and abutments were connected to allow a nonsubmerged healing. At least 2 mm of keratinized mucosa was surrounding the control sites, while at the test sites, the implants were bordered by alveolar mucosa. After 3 months, the animals were euthanized and ground sections obtained. Results: A higher vertical bony crest resorption was observed at the test compared with the control sites both at the premolar and molar regions...

The edentulous ridge expansion (ERE) technique an experimental study in the dog

Beolchini, Marco; Lang, Niklaus P.; Vigano, Paolo; Bengazi, Franco; Triana, Barbara G.; Botticelli, Daniele
Fonte: Wiley-Blackwell Publicador: Wiley-Blackwell
Tipo: Artigo de Revista Científica Formato: 1207-1211
ENG
Relevância na Pesquisa
16.95%
Objective: To compare the healing and bony crest resorption at implants installed conventionally or applying an edentulous ridge expansion (ERE) technique in the maxilla.Material and methods: In six Labrador dogs, the first and second maxillary incisors were extracted bilaterally. In the left side of the maxilla (Test), the flaps were elevated and the buccal plate of the alveoli and septa was removed. After 3 months of healing, partial-thickness (split) flaps were dissected and the residual alveolar bone was exposed. In the right side of the maxilla, an implant was installed conventionally (Type IV; Control) while, in the left side, the ERE technique was adopted. Hence, an expansion of the buccal bony crest was obtained, and the implant was subsequently installed (Test). After 3 months of healing, biopsies were obtained and ground sections were prepared for histological analyses.Results: A buccal vertical resorption of the bony crest of 2.2 +/- 1.2 mm and 1.6 +/- 0.7 mm was found at the test and control sites, respectively. The difference, however, did not reach statistical significance. The coronal level of osseointegration at the buccal aspect was located at 3.1 +/- 1.0 mm and 2.2 +/- 0.7 mm from the implant shoulder at the test and control sites...

Influence on alveolar resorption of the buccal bony plate width in the edentulous ridge expansion (ERE) - an experimental study in the dog

Beolchini, Marco; Lang, Niklaus P.; Ricci, Emanuele; Bengazi, Franco; Garcia Triana, Barbara; Botticelli, Daniele
Fonte: Wiley-Blackwell Publicador: Wiley-Blackwell
Tipo: Artigo de Revista Científica Formato: 109-114
ENG
Relevância na Pesquisa
16.95%
Objective: To compare the hard tissue changes at implants installed applying edentulous ridge expansion (E.R.E.) at sites with a buccal bony wall thickness of 1 or 2 mm.Material and methods: In six Labrador dogs, the first and second maxillary incisors were extracted, and the buccal alveolar bony plates and septa were removed. After 3 months of healing, partial-thickness flaps were dissected, and the E.R.E. was applied bilaterally. Hence, an expansion of the buccal bony crest was obtained in both sides of the maxilla with a displacement of either a 1- or a 2-mm-wide buccal bony plate at the test and control sites, respectively. After 3 months of healing, biopsies were obtained for histological analyses.Results: A buccal vertical resorption of the alveolar crest of 2.3 +/- 0.8 and 2.1 +/- 1.1 mm, and a coronal level of osseointegration at the buccal aspect of 2.7 +/- 0.5 and 2.9 +/- 0.9 mm were found at the test (1 mm) and control (2 mm) sites, respectively. The differences did not reach statistical significance. The mean values of the mineralized bone-to-implant contact (MBIC%) ranged from 62% to 73% at the buccal and lingual sites. No statistically significant differences were found. Horizontal volume gains of 1.8 and 1.1 mm were observed at the test and control sites...

A TRAINEE DEMAND ANALYSIS FOR THE EXPANSION OF THE MARINE CORPS EMBASSY GROUP

Slack, Richard T.
Fonte: Monterey, California. Naval Postgraduate School Publicador: Monterey, California. Naval Postgraduate School
Relevância na Pesquisa
16.95%
On September 11, 2012, the U.S. Consulate in Benghazi, Libya, was attacked, resulting in the death of four United States citizens, including Ambassador Christopher Stevens. Prior to Bengazi, the Marine Corps Embassy Security Group (MCESG) held a total strength of about 1,400 Marines, of which 1,196 were Marine Corps Security Guards (MSG). In response to the deadly attack, Congress authorized 1,000 new MSGs through the 2013 National Defense Authorization Act, creating additional protection for U.S. diplomatic facilities worldwide. This thesis examines the growth requirements needed to support MCESGs expansion demands to produce MSGs at maximum capacity in the coming three to four years. The study analyzes trainee demands, proposing a methodology to assist MCESG operation personnel plans for expansion and future force sustainment. The proposed methodology is founded on an Excel-based analytical approach that relies heavily on simulation and is interfaced through a Visual Basic for Applications (VBA) UserForm. The model is easily manipulated, as operational needs dictate. Once developed, VBA UserForm is a simple and effective tool that can assist planners in standardizing procedures at the operational level. Research-based analysis indicates that the proposed methodology could yield significant savings in terms of manpower and training requirements for MCESG.

Dimensional changes in soft tissues around dental implants following free gingival grafting: an experimental study in dogs

Bengazi, Franco; Lang, Niklaus P.; Caroprese, Marino; Urbizo Velez, Joaquin; Favero, Vittorio; Botticelli, Daniele
Fonte: Wiley-Blackwell Publicador: Wiley-Blackwell
Tipo: Artigo de Revista Científica Formato: 176-182
ENG
Relevância na Pesquisa
16.95%
ObjectiveTo study the buccal dimensional tissue changes at oral implants following free gingival grafting, with or without including the keratin layer, performed at the time of implant installation into alveolar mucosa.Material and methodsThe mandibular premolars and first molars were extracted bilaterally in six Beagle dogs. In the right side of the mandible (Test), flaps were first elevated, and the buccal as well as part of the lingual masticatory mucosa was removed. An incision of the periosteum at the buccal aspect was performed to allow the flap to be coronally repositioned. Primary wound closure was obtained. In the left side, the masticatory (keratinized) mucosa was left in situ, and no sutures were applied (Control). After 3months of healing, absence of keratinized mucosa was confirmed at the test sites. Two recipient sites were prepared at each side of the mandible in the region of the third and fourth premolars. All implants were installed with the shoulder placed flush with the buccal alveolar bony crest, and abutments were connected to allow a non-submerged healing. Two free gingival mucosal grafts were harvested from the buccal region of the maxillary canines. One graft was left intact (gingival mucosal graft), while for the second...

Influence of bone marrow on osseointegration in long bones: an experimental study in sheep

Morelli, Fabrizio; Lang, Niklaus P.; Bengazi, Franco; Baffone, Davide; Dadonim Vila Morales, C.; Botticelli, Daniele
Fonte: Wiley-Blackwell Publicador: Wiley-Blackwell
Tipo: Artigo de Revista Científica Formato: 300-306
ENG
Relevância na Pesquisa
16.95%
Aim To evaluate the influence of yellow bone marrow on osseointegration of titanium oral implants using a long bone model.Material and methodsThe two tibiae of eight sheep were used as experimental sites. Two osteotomies for implant installation were prepared in each tibia. At the control sites, no further treatments were performed while, at the test sites, bone marrow was removed from the osteotomy site with a curette to an extent that exceeded the implant dimensions. As a result, the apical portion of the implants at the control sites was in contact with bone marrow while, at the test sites, it was in contact with the blood clot. After 2months, the same procedures were performed in the contralateral side. After another month, the animal was sacrificed. Ground sections were obtained for histological analysis.ResultsAfter 1month of healing, no differences between test and control sites were found in the apical extension of osseointegration and the percentage of new bone-to-implant contact. However, after 3months of healing, a higher percentage of new bone-to-implant contact was found at the test compared to the control sites in the marrow compartment. The apical extension of osseointegration, however, was similar to that found at the 1-month healing period both for test and control sites.ConclusionsOsseointegration appeared to be favored by the presence of a blood clot when compared to the presence of yellow fatty bone marrow. Moreover...

Immediate loading of implants installed in a healed alveolar bony ridge or immediately after tooth extraction: an experimental study in dogs

Mainetti, Tomaso; Lang, Niklaus P.; Bengazi, Franco; Sbricoli, Luca; Cantero, Luis Soto; Botticelli, Daniele
Fonte: Wiley-Blackwell Publicador: Wiley-Blackwell
Tipo: Artigo de Revista Científica Formato: 435-441
ENG
Relevância na Pesquisa
16.95%
ObjectiveTo compare the sequential healing at immediately loaded implants installed in a healed alveolar bony ridge or immediately after tooth extraction.Material and methodsIn the mandible of 12 dogs, the second premolars were extracted. After 3months, the mesial roots of the third premolars were endodontically treated and the distal roots extracted. Implants were placed immediately into the extraction sockets (test) and in the second premolar region (control). Crowns were applied at the second and third maxillary premolars, and healing abutments of appropriate length were applied at both implants placed in the mandible and adapted to allow occlusal contacts with the crowns in the maxilla. The time of surgery and time of sacrifices were planned in such a way to obtain biopsies representing the healing after 1 and 2weeks and 1 and 3months. Ground sections were prepared for histological analyses.ResultsAt the control sites, a resorption of the buccal bone of 1mm was found after 1week and remained stable thereafter. At the test sites, the resorption was 0.4mm at 1-week period and further loss was observed after 1month. The height of the peri-implant soft tissue was 3.8mm both at test and control sites. Higher values of mineralized bone-to-implant contact and bone density were seen at the controls compared with the test sites. The differences...

Planeamento urbano na Libia entre a realidade e as perspectivas. Estudo de caso: região de Benghazi e sub-região de Al Jabal Al Akhdar

Taha, Mohamed Hamed Mohamed
Fonte: Repositório Científico Lusófona Publicador: Repositório Científico Lusófona
Tipo: Dissertação de Mestrado
POR
Relevância na Pesquisa
16.95%
O estudo tem como objectivo identificar o impacto da disseminação da construção urbana não prevista nos programas de planeamento urbano e de desenvolvimento regional da região de Al Jabal Al Akhdar, considerada como a província mais importante e distinta do resto das províncias do país pela particularidade das suas características ambientais naturais, e destaca as reformas do planeamento urbano na Líbia e as mais importantes etapas experimentadas pelas partes interessadas nesta área, como evidenciam as legislações e ferramentas aplicadas no domínio do planeamento urbano e regional. Este estudo é uma extensão do esforço do autor de preparação e de análise das informações de leitura para a Autoridade do Planeamento Urbano (UPA) onde se verificou uma grande prevalência da construção urbana não planificada resultando de vários problemas que afectaram os planos regionais e urbanos preparados para o desenvolvimento da região Al Jabal Al Akhdar. Vários factores sociais, económicos e políticos contribuíram para a propagação da construção urbana à volta das cidades, com diferentes padrões contrários às normas e formas de design urbano planificado, em termos de estrutura urbana externa e interna, bem como a distribuição de uso das terras...