China
Africa
Explore chapters and articles related to this topic
Surgery of the Knee
Published in Timothy W R Briggs, Jonathan Miles, William Aston, Heledd Havard, Daud TS Chou, Operative Orthopaedics, 2020
Alexander D Liddle, Lee A David, Timothy WR Briggs
Following successful removal of implants and cement, any fibrous membrane on the distal femur and proximal tibia is carefully removed with a small, sharp curette and bone nibblers. Even in cases where infection is not suspected, multiple samples should be sent for microbiology using clean instruments. Ideally, the remaining bone surfaces should consist of trabecular bone to allow optimum cementation. Any small, contained, cavitatory defects can be filled with morsellised bone graft or cement but larger, uncontained, segmental defects need to be reconstructed with augments, wedges (Figure 11.9) or rarely, endoprosthetic replacement.
Influence of resin composite cement on the final color of fixed rehabilitation
Published in J. Belinha, R.M. Natal Jorge, J.C. Reis Campos, Mário A.P. Vaz, João Manuel, R.S. Tavares, Biodental Engineering V, 2019
Joana F. Piloto, Claudia A.M. Volpato, Paulo Rocha, Paulo Júlio Almeida, César Silva, Paula Vaz
Within this study, twenty samples will be evaluated and divided into two groups (n = 10), according to the color of the composite resin cement used (Bifix SE, universal shade and Bifix SE, shade white) for the cementation of zirconia disk (Zirlux Anterior Multi, universal shade) with a dental composite resin disk (VOCO, GrandioSO—nano-hybrid composite, A5 opaque). Table 1 presents a summary of the relevant information of mentioned materials (Table 1). The Figure 1 exemplifies a methodology schematic representation of this in vitro study.
Inside the Operating Theatre
Published in Manoj Ramachandran, Tom Nunn, Basic Orthopaedic Sciences, 2018
Manoj Ramachandran, Steve Key, Alan White
Tourniquets are used to create a bloodless field in which to operate. This aids visualization and improves cementation. Pneumatic tourniquets are most often used and allow control of the pressure applied. Use of tourniquets can be hazardous, and the minimum pressure should be applied for the minimum length of time possible. The widest tourniquet possible should be used, and it should be at least half the diameter of the limb to reduce the risk of local pressure complications. When selecting tourniquet length there should be at least 3 inches (7.6 cm) of overlap of the tourniquet ends for sufficient hold, but ideally no more than 6 inches (15.2 cm) to avoid skin wrinkling under the tourniquet and possible local pressure complications related to this. It is applied well away from the operative field over two layers of padding; more layers of padding may reduce pressure transfer to the vessels and negate the effectiveness of the tourniquet. Contoured tourniquets can be useful in particularly obese or muscular patients to improve contact area. Systemic antibiotic prophylaxis must be administered at least 5 minutes before cuff inflation.
Influence of resin cement on color stability of ceramic veneers: in vitro study
Published in Biomaterial Investigations in Dentistry, 2021
Maryam Hoorizad, Sara Valizadeh, Haleh Heshmat, Seyedeh Farnaz Tabatabaei, Tahereh Shakeri
At present, light-cure resin cements are used for cementation of ceramic veneers due to their high strength, durable bonding and reinforcement of ceramic [4]. Evidence shows that light-cure resin cements are suitable for cementation of thin laminate veneers due to their more favorable color stability compared to self-cure and dual-cure cements [5]. Color change of resin cements can be seen through the ceramic veneers and affect the esthetic appearance of the restoration. Also, the color change of resin cements and ceramic veneers and their margins in the oral cavity is an important esthetic problem that may be encountered in the use of these restorations [6,7]. Considering the fact that these restorations are mainly in the esthetic zone, any discoloration can compromise their esthetics and necessitate restoration replacement, which is time consuming and costly for patients [8].
Cementing technique for primary knee arthroplasty: a scoping review
Published in Acta Orthopaedica, 2019
Anders M Refsum, Uy V Nguyen, Jan-Erik Gjertsen, Birgitte Espehaug, Anne M Fenstad, Regina K Lein, Peter Ellison, Paul J Høl, Ove Furnes
It is important to use the manufacturers’ advice on cement curing, since different cement types have different properties (Kühn 2000, Dahabreh et al. 2015). In summary, to generate a strong bone–cement and cement–cement interlock the application should take place at around 2–3 minutes in a doughy/application phase and the cement mantle should be at least 3 mm to weigh against the decay in the interlock over time (Miller et al. 2014). Park et al. (2001) show that creating a cement–cement interface was only 8% weaker than bulk cementation when created after 1 minute, whereas when created after 6 minutes was 42% weaker with only 50% bonding according to SEM analysis. After our literature search, Billi et al. (2019) published a laboratory study that recommended cementation of both the keel and undersurface of the tibial component, studying Palacos and Simplex cement. They also found that timing of cementation was important with improved pull-out force needed to separete the implant from the cement when the cement was applied on the implant in a sticky face 2 minutes after the start of mixing the Palacos cement and 3 minutes for the Simplex cement. The study also revealed that cementation in a dry condition gave higher pull-out force.
Bond strength of zirconia- or polymer-based copings cemented on implant-supported titanium bases – an in vitro study
Published in Biomaterial Investigations in Dentistry, 2021
Eliann Oddbratt, Lisa Hua, Bruno R. Chrcanovic, Evaggelia Papia
Within the limitations of this in vitro study, the following conclusions were drawn: All experimental groups performed inferior than the positive control group where the highest bond strength was reported for the cementation of zirconia copings when dual polymerized cement systems were used. The 3 D-printed polymer-based material had higher bond strength regardless of cement system used in comparison to PMMA. Airborne-particle abrasion did not improve the bond strength of the milled PMMA copings to the titanium base in comparison to PMMA copings not subjected to airborne-particle abrasion for the tested cement systems except when using Multilink Hybrid Abutment.