Adhesive Bridges Research Articles

Sequential Adsorption of Nanoparticulate Polymer Brushes as a Strategy To Control Adhesion and Friction.

This work investigates surface forces that result from adsorbed layers of silica nanoparticles with grafted pH-responsive, cationic poly(2-(dimethylamino)ethyl methacrylate) brushes (SiO2-g-PDMAEMA) and how adhesive bridging forces can be suppressed and friction forces reduced by "backfilling" these heterogeneous adsorbed layers with nonionic poly(ethylene oxide) star copolymers (Star PEO45MA). Adsorption of SiO2-g-PDMAEMA and Star PEO45MA to silica is measured as a function of pH by quartz crystal microbalance with dissipation (QCM-D) in order to evaluate the electrostatically driven adsorption of SiO2-g-PDMAEMA and hydrogen-bonding-driven adsorption of Star PEO45MA. Force measurements performed using colloidal probe force microscopy show the strong role that limited surface coverage plays in adhesive bridging forces between silica with adsorbed SiO2-g-PDMAEMA, while Star PEO45MA adsorption produces purely repulsive steric interactions. Bridging between SiO2-g-PDMAEMA-coated surfaces produces frictional forces that tend to be larger than those acting between bare surfaces at similar normal loads, while friction is consistently decreased by Star PEO45MA adsorption. Sequential adsorption of SiO2-g-PDMAEMA and Star PEO45MA generates high-coverage mixed nanoparticulate brush layers with uniformly repulsive normal forces and reduced friction forces. Adsorption and force measurements reveal that Star PEO45MA not only adsorbs to silica but also binds to SiO2-g-PDMAEMA. The latter allows sequential adsorption of the two components to produce mixed multilayers. The mixed SiO2-g-PDMAEMA/Star PEO45MA multilayers exhibit larger layer thicknesses, no bridging, and sustained smooth friction, highlighting their potential usefulness as aqueous boundary lubricant layers.

Fiber reinforced composite bridge as a replacement for missing upper permanent lateral incisor – a case report

Abstract Hypodontia of upper lateral incisors is significant aesthetic problem in young people. Ideal solution to this problem would be an implant placement, but there is a problem of unfinished growth and development. It is therefore necessary to have a temporary solution in order to maintain normal stomatognathic system functions and solve aesthetic problems until the final restoration is placed. The aim of this study was to show the possibility of treating hypodontia of permanent upper lateral incisors by creating adhesive bridge in one visit. A 15-year-old patient was referred to the Department for Prosthodontics, School of Dental Medicine in Belgrade with hypodontia of permanent upper lateral incisors. The patient had braces until 14 years of age after which she was rehabilitated with partial denture that was neither aesthetically nor functionally acceptable solution for her and significantly affected her emotional security. The adhesive bridge was made using GC composite fibers and a set of GC composite materials for the purpose of temporary replacement of missing teeth. This treatment provided good functional and aesthetic results. The space for the placement of two endosseous implants is preserved and a period of adaptation positively influenced the patient’s social development in sensitive adolescent age.

The adhesive bridge inlay retained in the therapy of minimal partial edentulism

In care of minimal partial edentulism, ie the lack of a tooth, as an alternative method can be used inlay retained adhesive restorations. The aim of this paper is to present possibilities for the application ceramic systems used for adhesive prosthetic restorations. In the making inlay restorations in the region of the posterior teeth can be applied ceramic system of higher strength which can be veneered with translucent ceramics. With the development of adhesive dentistry, it is possible to establish a strong link between restoration and teeth by means of composite cements and thus ensure sustainability of recovery. The clinical procedure is simple, minimally invasive, and provides a glimpse into a way of making inlay retained fixed restorations.

Bond strength between stell-concrete and between concretes with different ages in structural rehabilitation

ABSTRACTIn inspections of buildings, it is common to find structures that, well before reaching its useful life longer require repairs and reinforcements. This study examined the bond strength between concrete of different ages and between steel and concrete, focusing on the recovery of reinforced concrete structures. To analyze the bond between concrete of different ages, trials with specimens receiving three different types of treatments at the interface between the concrete were performed: brushing; brushing and mortar equal to concrete of substrate and brushing and epoxy layer. Indirect tensile tests and oblique and vertical shear tests at the interface were made . The bond stress between steel and concrete was evaluated by pull out test under the conditions of the bar inserted in the still fresh concrete and when inserted in the hardened concrete with epoxy. Results showed increased bond strength by indirect tensile stress of 15% and 37%; 4% and 12% for the adherence test by oblique shear, and 108% and 178%, for the testing of vertical shear, respectively, for the specimens whose interfaces have received, in addition to brushing, layer of mortar and epoxy bridge, compared to those who received only brushing. Insignificant loss (about 0.52%) of bond stress was noticed for pull out test of steel bar when compared with test results of the specimens that had steel bar inserted in the concrete in the hardened state with epoxy adhesion bridge, with those who had inserted steel bar in fresh concrete.

The Dentist's Preferences on the Treatment of Missing Mandibular Incisors in Patients of Varying Ages

Introduction: When mandibular incisor teeth are absent or lost through disease, multiple options for replacement of these teeth are available. It is possible that a patient may receive varying treatment depending on the dentist’s preference for replacing missing mandibular incisors. Objective: The present study was aimed to determine the dentists’ preferences on treatment options to replace missing lower incisors in patients of varying ages. Materials and Methods: Fifty questionnaires together with clinical photographs, a radiograph, and study casts were given to dentists working in the Glasgow Dental Hospital and School and dentists working in a dental clinic in Libya. The questions included in the questionnaire were directed towards the assessment of dentists’ preferences on treatment options to restore missing lower incisors in patients of different ages. Results: For the 18 year old group the most commonly used treatment options were both the use of an adhesive bridge (36%) and a fixed-fixed bridge (36%) although the overall preferred treatment option was the use of a dental implant (68%). Generally, the respondents were in agreement to use the same treatment options for the patient of 40 years old as for the 18 year old (82%). More than half (56%) of the respondents were in agreement to use the same treatment options for the 60 year old patient as for the 18 year old. Conclusion: Within the limitations of this study it can be concluded that there was a difference between some of the dentists in the preferred treatment for the replacement of missing incisors in the clinical scenarios presented in this study.

FIBER FRAMEWORK REINFORCED COMPOSITE RESIN BRIDGE APPLICATIONS AS AN ALTERNATIVE PROCEDURE TO CLASSIC PROSTHODONTIC TREATMENTS: FOUR CASE REPORTS

In some situations like, economic failure, general health problems or patient’s fear to other more invasive operations, fiber-reinforced composite (FRC) resin bridge applications may be an alternative treatment method in single tooth missed cases. A variety of treatment modalities, from implants to conventional Maryland bridges, can be used for replacing missed single tooth. In this article the purpose was to report FRC bridge restorations of missed single tooth in four cases (who did not want expensive treatment options or have health problems) and to evaluate the short-term clinical performance of such applications. In four different patients with maxillar bilateral canine teeth absence, maxillar left second premolar tooth absence, maxillar left central incisor tooth absence and mandibular left central incisor absence the FRC adhesive bridges were designed and performed. The restorations have provided important benefits aesthetically, phonational and functional. These procedures were very effective in terms of patient satisfaction because of the fact that they were minimal invasive, conservative and economic. There were no clinical problem and patient dissatisfaction in any case after one year of follow-up

POLİETİLEN FİBER DESTEKLİ ADEZİV KÖPRÜ UYGULAMALARI (ÜÇ OLGU SUNUMU)

Nowadays, patients quickly can want to have an aesthetically pleasing appearance due to lack of teeth on the anterior region. Fiber reinforced adhesive bridges can provide a good alternative treatment method when they ensure aesthetic requirements of patients. These systems can be treated as the aesthetic and conservative methods has led to the interest by patients and doctors in this field. This alternative treatment is practise that can be applied for presence of supporting teeth with periodontal disease and lossing teeth result from tauma and production temporary restoration before installation during implant treatment. There are a number of advantages of this type of dental bridge such as being minimal damage on support teeth, shortening the duration of treatment, being cheaper compared to other techniques and providing possibility of return back when unwanted situations. In this article, polyethylene fibers adhesive-backed bridge application and follow-up are presented

Adsorption mechanism of myelin basic protein on model substrates and its bridging interaction between the two surfaces.

Myelin basic protein (MBP) is an intrinsically disordered (unstructured) protein known to play an important role in the stability of myelin's multilamellar membrane structure in the central nervous system. The adsorption of MBP and its capacity to interact with and bridge solid substrates has been studied using a surface forces apparatus (SFA) and a quartz crystal microbalance with dissipation (QCM-D). Adsorption experiments show that MBP molecules adsorb to the surfaces in a swollen state before undergoing a conformational change into a more compact structure with a thickness of ∼3 nm. Moreover, this compact structure is able to interact with nearby mica surfaces to form adhesive bridges. The measured adhesion force (energy) between two bridged surfaces is 1.0 ± 0.1 mN/m, (Ead = 0.21 ± 0.02 mJ/m(2)), which is slightly smaller than our previously reported adhesion force of 1.7 mN/m (Ead = 0.36 mJ/m(2)) for MBP adsorbed on two supported lipid bilayers (Lee et al., Proc. Natl. Acad. Sci. U.S.A. 2014, 111, E768-E775). The saturated surface concentration of compact MBP on a single SiO2 surface reaches a stable value of 310 ± 10 ng/cm(2) regardless of the bulk MBP concentration. A kinetic three-step adsorption model was developed that accurately fits the adsorption data. The developed model is a general model, not limited to intrinsically disordered proteins, that can be extended to the adsorption of various chemical compounds that undergo chemical reactions and/or conformational changes upon adsorbing to surfaces. Taken together with our previously published data (Lee et al., Proc. Natl. Acad. Sci. U.S.A. 2014, 111, E768-E775), the present results confirm that conformational changes of MBP upon adsorption are a key for strong adhesion, and that such conformational changes are strongly dependent on the nature of the surfaces.

International Symposia on Direct adhesive bridges and splints using fibers: Step by step procedures

International Symposia on Direct adhesive bridges and splints using fibers: Step by step procedures

Rehabilitation of Anterior Tooth Loss Due to Trauma with Fiber and Zirconia Substructured Adhesive Bridges

Rehabilitation of Anterior Tooth Loss Due to Trauma with Fiber and Zirconia Substructured Adhesive Bridges

Postextractive implants in aesthetic areas: evaluation of perimplant bone remodeling over time

The aim of this research was to assess peri-implant bone remodeling of post-extractive implants over 2 years. 30 patients meeting pre-established inclusion criteria were enrolled for the study. One implant for each patient was inserted in the post-extraction sockets according to a defined surgical protocol (atramautic extraction, curettage of extraction socket, implant insertion, grafting with collagenated cortico-cancellous porcine bone, and a trimmed collagen membrane to completely cover the socket, suture). A temporary adhesive bridge, with an adequate profile, was bonded to the adjacent teeth. X-ray evaluation with a standardized stent was carried out at different times. Measurements were obtained from the implant edge to the bone peak. The values obtained at time 0 and at 2 years were compared by t-student test. Our results showed that after one year 73% of patient had 0 mm of bone reabsorption, 20% of patient had 0 mm ≤ x ≤ 0.5mm, 7% of patient had 0.5 mm ≤ x ≤ 2 mm of bone reabsorption. After two years 62% of patient had 0 mm of bone reabsorption, 24% had 0 mm ≤ x ≤ 0.5mm, 14% had 0.5 mm ≤ x ≤ 2 mm. The results showed no significant differences in bone reabsorption in most patients over 2 years.

Desain modifikasi dari resin-retained fixed partial denture (Modification design of resin-retained fixed partial denture)

Modern Dentistry tends to achieve esthetic and efficiency of treatment. Patient will be interfered with edentulouscondition in longterm, especially for anterior tooth. Minimal tooth preparation and short visiting time will be chosenby most of patients. Resin-retained fixed partial denture can be the choice of treatment for partially edentulous tooth,as definitive prosthethic or interim prosthetic. An aspect for the succesfull resin-retained fixed partial denture is thedesign of bridgework. Many dentistsare avoid to provide adhesive bridge for their patients because of its high failurerates. This paper discussed about resin-retained fixed partial denture design as information for the dentists to get theright design for succes rate guarantee.

Lymphotoxin-β receptor signalling links steatohepatitis, hyper-lipidemia and atherosclerosis

Lymphotoxin-β receptor signalling links steatohepatitis, hyper-lipidemia and atherosclerosis

Dental treatment guideline on adhesive bridge

Dental treatment guideline on adhesive bridge

Cryogenic strength of adhesive bridge joints for thermal insulation sandwich constructions

Cryogenic containment systems for LH2 (Liquid Hydrogen) and LNG (Liquefied Natural Gas) generally require two barriers: the primary barrier made of stainless steel or Invar which contacts directly the cryogenic liquids, the secondary barrier made of composite or metal foil which functions as the faces of sandwich constructions for thermal insulation.The faces of sandwich constructions are bridged with metal strips which are usually adhesively bonded for gas tightness. When cryogenic liquids are loaded in the containment system, the adhesive bridge joints are subjected to both the thermal load and deformation due to the shrinkage of the sandwich constructions.Since the maximum deformation in the sandwich construction systems may occur in the metal bridge between the two sandwich constructions, the cryogenic performances of adhesive bridge joint with level difference, which would be generated due to manufacturing tolerance, were evaluated using both the new appropriate test method and FE analysis.

AFM forces between mica and polystyrene surfaces in aqueous electrolyte solutions with and without gas bubbles

Force curves between a flat mica substrate and a polystyrene microsphere were measured with an atomic force microscope (AFM) in carefully degassed water and aqueous NaCl, CaCl2, and AlCl3 solutions. The pH of the water used does not change significantly with degassing treatment, and its value remains close to 6. Electrolyte concentration ranges from 10−4 to 10−2M and pH from 4.7 to 5.1. We have found that the repulsive long-range electrostatic force between mica and polystyrene is attenuated by the presence of electrolytes and counterbalanced by a long-range attractive force, which we referred to as a hydrophobic force, which is longer-ranged than the ever present attractive van der Waals force. This force, which includes the adhesive bridging of residual air bubbles and newborn vapor cavities, and any other unknown forces, is reasonably well represented by a unique exponential law. Prefactor and decaying length are not very sensitive to electrolyte type, concentration, and pH, suggesting that any new force included in the law, in addition to adhesive bridges, should obey a non-classical electrostatic mechanism. However, we also know that liquid/solid contact angle and liquid/vapor surface tension increase with electrolyte concentration and valence increasing the stability of bubbles and cavities which in turn increase the bridging force. Clearly, these effects are hidden in the empirical force law.

Desain pin hole mempengaruhi kuat rekat geser gigitiruan jembatan adesif Pin hole design affect shear bond strength of adhesive bridge

To overcome the failure of adhesive bridge due to release of the adhesive bond cement between teeth and metal,preparation modification was performed with a pin hole in the teeth cingulum. This study aimed to determine the effectof thread on a pin hole to shear strength adhesion of adhesive bridge. Forty maxillary incisors were prepared at theirpalatinal surfaces 0.3 mm thick, and were divided into four treatments (threaded hole+threaded pin, threaded holes+non-threaded pin, non-threaded holes+threaded pin, non-threaded holes+non-threaded pin). Casted-plates made fromnickel chromium alloy were cemented to the palatal surface of the tooth with adhesive cement (Panavia TMF 2.0), andthen adhesion shear strength tested. The test and evaluation of the residual cement on the surface were performed inLaboratory Metallurgy, Department of Engineering ITB. Data were analyzed by one-way ANOVA test (p=0.05).Adhesion shear strength of plate with threaded holes+threaded pin has the highest retention. Residual cement onthreaded hole+threaded pin plates similar to threaded hole+non-threaded pin, but more than any other groups. theconclusions were, the adhesion shear strength depends on the design of pin hole. The wider surface of cementremaining on the plates, the greater adhesion shear strength.

Puente adhesivo en paciente con labio leporino y fisura velopalatina. Una solución temporal con compromiso estético

Today the increasing demand of aesthetic and minimally invasive procedures has led to a boom of the adhesive technique. Ribbond® is a polyethylene fiber that allows an efficient transfer of forces, is virtually foldable and is easily adapted to tooth morphology and dental arch contour. Among its main features we can find: Biocompatibility, inert, translucent and durable. In dentistry, different uses have been given to this fiber, whether as space maintainer, adhesive bridge, endodontic post and core, splinting, inlay type restorations and postorthodontic stabilization. In the case of cleft lip and palate patients the use of Ribbond® as an adhesive bridge has become relevant, as it improves aesthetics and temporarily rehabilitates the edentulous spaces caused by the absence of an incisor. It is used especially after completion of the orthodontic treatment and waiting for a final rehabilitation, even when the patient has not completed their growth and development. This article presents a clinical case of a patient with lip and cleft palate operated with the rehabilitation technique using Ribbond®.

ВРЕМЕННЫЕ ОРТОПЕДИЧЕСКИЕ КОНСТРУКЦИИ ПРИ ПРОТЕЗИРОВАНИИ НА ДЕНТАЛЬНЫХ ИМПЛАНТАТАХ. СРАВНИТЕЛЬНАЯ ХАРАКТЕРИСТИКА

<p>for the period of osteointegration of dentalny implants to patients installation of temporary orthopedic designs was made: partial removable plastinochny artificial limb, adhesive bridge, plastic bridge, metalplastic bridge. After clinical supervision and questioning of patients optimum designs were determined by esthetic and functional requirements. for frontal department of the upper and lower jaw the most optimum design will be the adhesive bridge- like artificial limb, or the bridge-like artificial limb made of metalplastic. for lateral department of the upper and lower jaw – a bridge-like artificial limb from metalplastic, or a partial removable plastinochny artificial limb.</p>

Gigitiruan jembatan adesif sebagai perawatan alternatif pada kasus kehilangan satu gigi Adhesive bridge as alternative treatment to replace one missing teeth

Adhesive bridge is a fixed partial denture that consisted of pontic and cast metal framework retainer that cementedto abutment teeth by means of adhesive cement, used acid etch technique. Adhesive bridge can be used to replaceone or two anterior or posterior teeth. This case report focused on the making of adhesive bridge in anterior andposterior single missing tooth. By minimal preparation and unanesthesied teeth, patient satisfaction could beachieved. Treatment should be done as patient needed with the adequate clinical technique and specific materialmanipulation.