Clinically acceptable values of shear bond strength of orthodontic brackets bonded on enamel: An integrative review

Itanielly Dantas Silveira Cruz,Rafaela Monteiro De Araújo,Arthur César De Medeiros Alves,Amanda Felix Gonçalves Tomaz,Mariana Cabral Moreno,Hallissa Simplício Gomes Pereira,Sergei Godeiro Fernandes Rabelo Caldas

doi:10.33448/rsd-v10i4.13927

Itanielly Dantas Silveira Cruz, Rafaela Monteiro De Araújo + Show 5 more

Open Access

https://doi.org/10.33448/rsd-v10i4.13927

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Abstract

Objective: The objective this review was to identify the current range of shear bond strength values (SBS) that are clinically acceptable based on a synthesis of the studies published in 20 years that evaluated the SBS of brackets bonded to dental enamel with emitter diode light photo activators and whether damage to the enamel has been reported after the test. Methodology: A search strategy was developed for the selection of articles published from 1999 to 2019 in the PubMed/MedLine electronic database. In addition to reading the titles, keywords and summaries of the studies found, the studies were also obtained for the reading of the methodologies and identification of the inclusion and exclusion criteria. Results: The search for scientific articles resulted in 580 studies, but only 14 were selected based on the pre-established criteria. Ten presented methodological quality to be included in this integrative review, and the mean SBS found was 14,05 MPa with a standard deviation of ± 6,52 MPa (range from 7,53 to 20,57 MPa). Conclusion: In conclusion, it was observed that the range of shear bond strength values (5,9 to 7,8 MPa) and taken as a parameter by most authors until now is outdated, since higher values of SBS are feasible without, however, causing dental enamel damage after the debonding of the bracket.

Highlights

The clinical procedure performed to fix the bracket on the tooth enamel surface is done through the application of polymerizable composite resin at its base, with or without the use of adhesive systems, and may be assisted by photoactivating apparatus
The light sources used in this phase may be from light emitting diode (LED), argon laser, halogen light or xenon plasma arc
Eligibility criteria: The research question of the present review was: "What is the current range of shear bond strength values that can be clinically accepted?"; considering the assistance of the tool designated by the acronym PICOS (Raich e Skelly, 2013), where "P" corresponds to the population, "I" to the intervention, "C" to the comparison/control, "O" to the outcome and “S” to type of study; being: (P) Population - Orthodontic brackets bonded on dental enamel with LED photo activators; (I) Intervention - Mechanical shear test; (C) Comparison/control - Not applicable; (O) Outcome - Shear bond strength; (S) Type of study - "In vitro" studies

Summary

Introduction

The clinical procedure performed to fix the bracket on the tooth enamel surface is done through the application of polymerizable composite resin at its base, with or without the use of adhesive systems, and may be assisted by photoactivating apparatus. Proposed by Mills, Jandt and Asworth (1999), LED appliances are the most widely used today and their main differentials relate to no need for cooling fans, the shock resistance, to the silence mode how they work, by generating heat minimum, for having a higher power and a lifetime of 10 thousand hours, on average (Ulusoy et al, 2008). Since the energy density is the result of the multiplication of the irradiation time versus the light intensity (mW/cm2), some authors proposed to reduce the time of photoactivation of the devices, provided that their power was raised to maintain the degree of conversion of the resins inside of the appropriate standards (Rueggeberg, 2011)

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