ABSTRACT
Nos últimos anos diferentes desenhos de implantes têm sido sugeridos e desenvolvidos para a utilização na substituição de perdas dentais. Dentre esses, os mais comuns são os implantes cilíndricos e cônicos, sendo esse último, atualmente mais procurado pela sua facilidade de inserção e melhor estabilidade primária. O objetivo deste estudo foi avaliar a interface osso/implante da superfície tratada por jateamento com micropartículas de óxido de titânio em dois tipos modelos de implantes dentais, analisando comparativamente a diferença e direcionamento do crescimento do tecido ósseo em contato de cada modelo através de fotomicrografias obtidas pela microscopia eletrônica de varredura (MEV). Foram utilizados três coelhos New Zelands, adultos, com peso médio de 3,5Kg, obtido no Biotério Central da Universidade Federal de Santa Maria (UFSM). Foram utilizados 6 implantes cilíndricos e 6 implantes cônicos de hexágono interno fabricados pela empresa Implacil Material Odontológico (Implantes Bortoli), os quais apresentam superfície jateada por óxido de titânio. Marcadores ósseos (Alizarina, calceina, tetraciclina) foram injetados subcutaneamente em diferentes intervalos de tempo após a implantação para avaliar o tempo de formação do novo osso no período de 8 semanas. Após as oito semanas os animais foram sacrificados e os implantes removidos com uma porção de tecido ósseo e fixadas em e fixadas solução a base de formol por três dias. Na sequência essas foram desidratadas em álcool e incluídas em resina especial para microscopia. Foram realizados cortes em um micrótomo para a obtenção das amostras, sendo obtidos 3 cortes de cada, as quais foram analisadas e comparadas verificando-se as áreas de contato das superfícies com o tecido ósseo por microscopia de luz, de fluorescência e de varredura. Os resultados demonstraram que a superfície proposta promove uma osseointegracão muito efetiva e em uma sequência de tempo adequada e esperada e, que o desenho do implante cônico parece ter direcionado o crescimento do osso cortical em uma maior área de superfície. Concluiu-se que o modelo de desenho do implante pode influenciar a qualidade e quantidade de osseointegracão dos implantes dentais e pode direcioná-la, porém novos estudos sobre essa área de contato osso/implante devem ser propostos.
In recent years various designs of implants have been suggested and developed for use in replacing tooth losses. Among these, the most common implants are cylindrical and conical, the latter being currently most sought by its ease of insertion and better primary stability. The aim of this study was to evaluate the bone-implant interface surface treated by sandblasting with microparticles of titanium oxide models into two types of dental implants, comparatively analyzing the difference and direction of growth of bone tissue in contact for each model by photomicrographs by scanning electron microscopy (SEM). We used three rabbits New Zelands adults, with an average weight of 3.5 kg, obtained from Central Animal of University Federal of Santa Maria (UFSM). Six implants cylindrical and six conical implants with internal hexagon were used, manufactured by the company Implacil Dental Materials (Implants Bortoli), which have blasted surface of titanium oxide. Bone markers (alizarin, calcein, tetracycline) were injected subcutaneously at different time intervals after implantation to assess the time of formation of new bone within 8 weeks. After eight weeks the animals were sacrificed and the implants removed with a portion of bone tissue and fixed and fixed based solution of formaldehyde for three days. Following these were dehydrated in alcohol and embedded in special resin for microscopy. Cuts were made in a microtome to obtain the samples, obtained from three sections of each, which were analyzed and compared by checking whether the contact areas of surfaces with the bone tissue by light microscopy, fluorescence and scanning. The results demonstrated that the proposed surface promotes osseointegration in a very effective and proper time sequence and expected, and the tapered design of the implant seems to have driven the growth of cortical bone in a larger surface area. It was concluded that the model of implant design can influence the quality and quantity of osseointegration of dental implants and can direct it, but further studies on this area of bone to implant contact should be proposed.
Subject(s)
Animals , Rabbits , Bone Development , Dental Implantation, Endosseous , OsseointegrationABSTRACT
This prospective clinical study aimed to evaluate the benefits of the endoscope as an aid to root-end management, and to assess the treatment outcome during 2 years following surgery. Forty-three endodontic surgical procedures in 30 patients were performed with the aid of an endoscope and followed for a period of 2 years. Radiographic criteria and clinical evaluation were used to assess the outcome. All cases were evaluated in terms of healing and functionality. 91.1% and 90.7% of the teeth evaluated after 1 and 2 years, respectively, were classified as successful. We found no statistically significant differences for both healing and functionality between the 1- and 2-year evaluations. No difference related to tooth type or tooth location was found at the 2-year follow-up. Fisher's exact test was used to statistically assess the difference between successful and unsuccessful cases for each of the variables considered. The endoscope can be an aid for endodontic surgical procedures in terms of both periapical healing and functionality up to 2 years follow-up.