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The adhesion of the composite resin to the dentin occurs by the formation of the hybrid layer. Thus, its degradation causes loss of union resistance on interface resin / dentin interface, directly influencing the longevity of the restoration. After the acid etching and the application of the adhesive system into demineralized dentin, collagen fibers not involved by adhesive system get unprotected and susceptibles to attack by metalloproteinases (MMPs). The enzymes, present in the dentin itself, are rehabilitated by phosphoric acid or by the acids monomers of the self-etching adhesives initiating degradation. The application of chlorhexidine (CHX) in the dentin, after acid conditioning, prevents or slows down the degradation of the collagen fibers of the hybrid layer. This literature review sought to clarify the effect of MMPs on the degradation of the hybrid layer and the effects of chlorhexidine on the adhesion process. It was concluded that the adhesive bonding to dentin decreases with the passage of years due in part to the action of MMPs, which degrade collagen not infiltrated by adhesive monomers in the deepest part of the hybrid layer. In addition, the use of chlorhexidine as a therapeutic inhibitor in conventional adhesive systems is capable of inhibiting the MMPs and thus the adhesive bonding to the dentin can be kept stable for a longer period of time. [ABSTRACT FROM AUTHOR]

Introduction: adhesive systems are dental materials that allow adhesion to dental substrates with satisfactory mechanical properties. With the evolution of adhesive systems, they sought to provide more simplified materials with low sensitivity to the technique. Thus, universal adhesive systems were introduced in clinical practice. Objective: to review the literature about universal adhesive systems, emphasizing its clinical protocols and evaluation of union strength in enamel and dentin in an attempt to better understand the use of this material. Methods: this study was characterized by a bibliographic search in electronic data bases: PubMED / Medline, Lilacs, Scielo and academic Google, limiting the search to the period from 2010 to 2018. Results: among the functional monomers contained in the universal adhesive systems, the literature indicates that 10-MDP has a stability in terms of longevity and durability greater than 4-META and Phenyl-P. Conclusion: universal adhesives provide versatility of use, good bonding strength to the dental substrates, a reduction in the chances of making mistakes during the application of the material, facilitating their use, since they can be used associated or not to phosphoric acid. However, it's necessary to pay attention to contraindications, such as incompatibility with other materials, should be emphasized so that clinical failure of the procedure does not occur. [ABSTRACT FROM AUTHOR]

Introduction: Universal adhesive systems (UAS) were introduced in clinical practice in mid-2011, due to the need for more simplified materials and with low sensitivity to the technique. Such adhesives can be used in three ways: self-etching, total acid conditioning and selective acid conditioning in enamel. Objective: in this context, the objective of this work was to review the literature about universal adhesive systems, emphasizing its clinical protocols and evaluation of union strength in enamel and dentin. Materials and Methods: this study was characterized by a bibliographic search in electronic data bases: PubMED / Medline, Lilacs, Scielo and academic Google, limiting the search to the period from 2010 to 2018. Results: universal adhesive systems used in the enamel self-etching mode do not obtain satisfactory bond strength, therefore, when dental enamel is involved, selective conditioning must be done to obtain higher bond strength values. Conclusion: universal adhesives provide a good bond strength to the dental substrates, as well as reducing the chances of making mistakes during the application of the material, facilitating the use, since it can be used associated or not with phosphoric acid. [ABSTRACT FROM AUTHOR]

Introduction: In dentistry, occlusion is the relationship of the upper teeth located in the maxilla with the lower teeth located in the mandible when they are in normal and physiological activity, without causing discomforts and pain to the patient during chewing. Conversely, we have a pathological or adaptive alteration that damages the periodontium due to excessive forces resulting in occlusal trauma. Objectives: This paper aims to synthesize scientifically based information that addresses occlusal trauma in order to highlight the importance of knowledge about its etiology, diagnosis and possible treatments for this pathology. Methods: A literature review systematized in the electronic databases, Pubmed and Medline, was limited to the search for the period from 2011 to 2018. Conclusion: Given the information presented, the dental surgeon must be able to obtain the correct diagnosis of dental trauma. Thus, a careful analysis made from complementary tests is indispensable to be successful in the final diagnosis. [ABSTRACT FROM AUTHOR]

Introduction: coronary fractures of anterior teeth are frequently observed in both children and adolescents because the position of these elements in the oral cavity is quite vulnerable. Because of that, the collage of fragments appears as a viable alternative of repair of the dental elements once they have suffered some type of trauma. Objective: this study aims to present, through a bibliographic review, the fundamentals, advantages, disadvantages and applications of this surgical technique. Materials and Methods: we conducted a survey in the scientific literature, using review articles found in PubMED / Medline, Lilacs and Scielo databases. Articles were selected according to the inclusion criteria: availability of the full text of the study and clarity in the methodological detail used. The descriptors used were "tooth fragment" and "reattachment". Results: fragment collage can be applied to vital and non-vital teeth, depending on the size of the fracture, periodontal conditions, the biological width of the invasion, among other factors. It is a simpler procedure and has a higher durability than composite resin restorations. On the other hand, if the fragment is not well hydrated, color changes may occur, in addition to the possibility of fragment displacement. Conclusion: due to the advances and improvements of this technique, dental bonding fragments is an excellent clinical option for the functional and esthetic reestablishment of the compromised dental structure. [ABSTRACT FROM AUTHOR]