China
Africa
Explore chapters and articles related to this topic
Monographs of fragrance chemicals and extracts that have caused contact allergy / allergic contact dermatitis
Published in Anton C. de Groot, Monographs in Contact Allergy, 2021
A dental patient developed an ‘allergic reaction’ to a zinc oxide-eugenol temporary restoration dental cavity, characterized by irritation and redness of the oral mucosa, complete sloughing of the oral mucosa, bilateral loss of papillae on the tongue, and ulceration at the vermilion border. In addition, mild facial swelling was present. Later, one week following endodontic treatment with a temporary filling containing a lower concentration of eugenol, the patient reported a ‘similar allergic reaction with redness of the oral mucosa and altered taste sensation’. It was ‘found that the patient had an allergic reaction to the slight amount of eugenol contained in the temporary filling’. However, patch tests were not performed (98).
Molecular biology of irreversible pulpitis: A case report
Published in Robert Hofstra, Noriyuki Koibuchi, Suthat Fucharoen, Advances in Biomolecular Medicine, 2017
Filling is first done with the lateral condensation technique and then a radiographic image is taken to see the filling result. The radiographic image illustrates hermetic filling and is in accordance with the working length. Then, reduction of gutta percha as much as 2 mm below the orifice is done using a heated sterile excavator, and glass ionomer cement is put on top of it (GC, Gold-Label). It is then covered with a temporary restoration (Figure 6). The patient was asked to return 1 week later to do photo controls.
Finishing and polishing of acrylic resins used in provisional restorations
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
S. Matos, F. Araujo, A. Correia, S. Oliveira
The surface of a temporary restoration may be terminated using various techniques, from abrasive disks to polishing pastes. Not all interim restoration finishing methods may work perfectly, depending on the types of materials available. (Guler et al. 2005) Finishing is the process that involves removing marginal irregularities, defining anatomic contours, and smoothing away surface roughness of a restoration. Polishing is the process carried out after the finishing and margination steps of the finishing procedure to remove minute scratches from the surface of a restoration and obtain a smooth, light-reflective luster. The polishing process is also intended to produce a homogeneous surface. (Jefferies 2007) The use of rubber discs is also recommended when compared to the use of varnishes in the tooth preparation. (Borchers, Tavassol, and Tschernitschek 1999) The techniques used during the finishing and polishing of tooth restorative materials not only improves the longevity and aesthetic appearance of the material, but also minimizes plaque accumulation, gingival irritation and secondary caries. (Rahal et al. 2004) It is practically impossible to achieve a highly polished surface due to the characteristics of the materials. By analyzing different studies, it is possible to notice that there is no consensus on the best finishing and polishing technique. (Madhyastha et al. 2015) Aluminum oxide is a chemical compound of aluminum and oxygen. Its hardness makes it suitable for use as an abrasive and as a component in cutting tools. Aluminum oxide is typically produced as particles bonded to paper or polymer disks and strips or impregnated into rubber wheels and points. Fine particles of aluminum oxide can be mixed into a polishing paste to produce smooth, polished surfaces on many types of restorations, including acrylics and composites. (Jefferies 2007) The main requirements for choice of interim materials are an appropriate marginal adaptation, resistance to fracture, low thermal conductivity, non-irritating reaction to the dental pulp and gingival tissues, and ease of cleaning. The surface roughness of acrylic resins is highly relevant because affects the tissues in direct contact with the dental structure. (Burns et al. 2003).
Molar-incisor hypomineralization: an umbrella review
Published in Acta Odontologica Scandinavica, 2021
Luísa Bandeira Lopes, Vanessa Machado, João Botelho, Dorte Haubek
An early diagnosis is fundamental in MIH, in order to prevent further complications like hypersensitivity, dental caries, pulp inflammation, and pain. In this way, preventive interventions with glass ionomer cements as temporary restoration or an early restorative treatment is advisable and indicated. When MIH is detected, parents and off-spring with MIH must be informed about the consequences, like the risk of hypersensitivity, post-eruptive breakdown, higher incidence of caries, difficulties to obtain pain control, and the possibility of numerous appointments for dental care. Recall consultations should be defined according to the severity of MIH, colour of the opacities, and even based on the presence of symptoms. Thus, the treatment modalities available are prevention and symptom control, sealant, restoration, SSCs, and extraction. The hypersensitivity requires to be addressed, because it does not allow effective oral hygiene, thereby an increased risk of caries arises. Remineralization, using CPP-ACP, seems to a possibility for minimization of mild or moderate hypersensitivity in teeth affected by MIH.
Bond strength between titanium and polymer-based materials adhesively cemented
Published in Biomaterial Investigations in Dentistry, 2021
Camilla Johansson, Aleksandra Håkansson, Evaggelia Papia
In the Telio CAD groups, all cylinders had adhesive failures, indicating that the bond between the different adhesive cement systems and Telio CAD is unstable. On the contrary, MFH showed a stronger bond to the cement since the failures were a mixture of cohesive and adhesive fractures indicating a higher probability that the temporary restoration will last until the permanent restoration is to be cemented. The adhesive fractures of the Telio CAD groups indicate that the chemical interaction with all tested cements except RelyX Ultimate is insufficient, and some type of abrasive surface treatment is needed. The manufacturer of Telio CAD recommends the application of SR Connect to the cementation surface of Telio CAD prior to cementation with Multilink Hybrid Abutment. However, some specimens debonded before the shear bond strength test, indicating that SR Connect without sandblasting results in lower bond strength. The findings in the present study highlight the importance of pre-treatment methods, but further studies are required to confirm this assumption. In accordance, the instructions for use for Telio CAD, published after the study was conducted, have now been updated to include sandblasting of the cementation surface.
MARIO: the first chewing bench used for ageing and analysis the released compounds of dental materials
Published in Computer Methods in Biomechanics and Biomedical Engineering, 2019
C. Jeannin, K. Gritsch, J. J. Liodénot, B. Grosgogeat
The seal and operating tests of the mechanical parts (pumps, motors) and software have been satisfactory and MARIO is currently operational. This has made it possible to carry out calibration tests in order to identify the released products pertaining to the robot parts. Preliminary tests on easy-to-degrade biomaterials such as temporary restoration material (IRM™, Dentsply) have been completed and samples are awaiting analysis.