Capacidade de união de resinas adesivas à dentina afetada e infectada por cárie

Hybridized dentin permits dental treatments that were previously impossible with conventional techniques, opening new frontiers in modern adhesive dentistry. We have investigated the adhesive property of current bonding systems to caries-infected dentin by a microtensile bond strength test (µTBS) and transmission electron microscopy (TEM), and suggested that bonding resin could infiltrate into caries-infected dentin partially to embed carious bacteria within hybrid layers. We have named this concept of caries control as modified sealed restoration (MSR). On the other hand, Kuraray Medical Inc. (Tokyo, Japan) has developed an antibacterial adhesive system (ABF, now marketed in USA as Protect Bond). So as to evaluate the effectiveness of ABF on root caries control, we have examine the microtensile bond strengths (µTBS) of ABF to normal versus carious root dentin and the interfacial morphology by a scanning electron microscopy (SEM). ABF could form the hybrid-like structures by infiltrating into the surfaces of the root carious dentin, and the mean value of µTBS of ABF to root carious dentin was 23.0 MPa. These results suggested that MSR combined with ABF might be an advantageous minimal invasive therapy for root caries.As técnicas adesivas permitiram inovações nos tratamentos restauradores da atualidade. Este estudo investigou a qualidade de união de diferentes sistemas adesivos ao substrato dentinário afetado e infectado por cárie, através de testes de microtração e microscopia eletrônica de transmissão e varredura (MET). Os resultados sugerem que a resina adesiva pôde infiltrar na dentina infectada e envolver as bactérias na camada híbrida. Esse conceito de controle da cárie foi denominado de "Restauração-Selante Modificada" (RSM). Por outro lado, a empresa Kuraray Med. Inc .(Japão) desenvolveu um sistema adesivo com propriedades anti-bacterianas (ABF), o qual é comercializado nos EUA como Protect Bond. Para avaliar a efetividade do sistema ABF sobre cáries radiculares, empregou-se testes de resistência adesiva e análise por microscopia eletrônica. O sistema ABF foi capaz de formar uma estrutura interfacial semelhante à camada híbrida, através da infiltração na superfície da dentina cariada radicular e os valores de resistência de união foram em média de 23 MPa. Os achados sugerem que a combinação da técnica RSM com o sistema ABF parece ser uma alternativa para o emprego da terapia de mínima invasão em cáries radiculares

Report on DELP 1986 Cruise in the Northwestern Pacific : Part 4: Measurement of Three Components and Total Force of the Geomagnetic Field

During the DELP-1986 cruise, three components of the geomagnetic field and the total force intensity were measured with an STCM (Shipboard Three Component Magnetometer) and a proton precession magnetometer. STCM provides three component geomagnetic field intensities on board a research vessel, of which results can be used to identify the orientation of the magnetic lineament from only one single ship track. Our data give some additional information on the magnetic anomaly lineation patterns of the northwestern Pacific and the direction of lineation of the area surveyed by the present cruise is reexamined by the three component magnetic field data. The direction of geomagnetic anomaly lineation of this area is confirmed to run with a N70°E strike. Two vessels were used for the present study, i.e. WakashioMaru for three component magnetometer run and Daisan KaikoMaru for single proton magnetometer run.1986年度夏期に実施されたDELP並びに地震予知共同観測で得られた,地磁気三成分(水平二成分,鉛直一成分)及び全磁力の異常分布について報告する.三成分の測定は船舶用フラックスゲート磁力計により,全磁力は,プロトン型磁力計により行われ,両者間では補正を行なうことが可能である.また三成分磁力計はジャイロによる方位の測定と船体磁気の補正により,地理方位三成分の値として得られる.三成分の利点は,航跡が単数であっても,海底下に分布する地磁気異常源の走向を推定できることにある.今日までに得られている,標題海域の地磁気異常分布について今回の様な測定により,新たな吟味を加える事が可能である.この海域に於ける地磁気異常の走向はN70°Eであることが確認された