Abstract
Objective: This study investigated the effects, on the shear bond strength of orthodontic brackets, of using an antimicrobial selenium-containing sealant (DenteShieldTM) to serve dual functions of priming enamel prior to bonding and as a protective barrier against whitespot lesion formation. Materials and Methods: A total of 150 extracted human premolars were randomly assigned into 10 groups (n=15/group). Stainless steel brackets were bonded with two adhesive systems (DenteShieldTM or Transbond XT) after the enamel was conditioned with a primer (DenteShieldTM or Assure Universal) or a filled resin sealant (DenteShieldTM, Pro SealTM or Opal SealTM). The specimens were stored in deionized water at 37 °C for 24 hours and debonded with a universal testing machine. Results: The use of DenteShieldTM adhesive to bond orthodontic brackets to the enamel surface resulted in a significantly lower (P<0.05), but clinically acceptable, shear bond strength (mean & SD: 14.5±1.6 MPa) as compared with Transbond XT group (mean & SD: 19.3±1.7 MPa). DenteShieldTM sealant used as primer resulted in shear bond strength values comparable to those of Pro SealTM and Opal SealTM. All adhesive-sealant and primer-sealant combinations tested in this study exhibited shear bond strength values greater than 9.6 MPa, sufficient for clinical orthodontic needs. Conclusion: DenteShieldTM sealant can serve as primer as well as anti-demineralization sealant during orthodontic treatment without adversely affecting the shear bond strength of the bracket.
Highlights
Enamel demineralization, known as White Spot Lesion (WSL), is an unwelcomed but common occurrence in patients undergoing orthodontic treatment with fixed appliances [1]
The mean shear bond strengths, standard deviations, and ranges for each primer-adhesive and sealant-adhesive combination tested are summarized in Fig. (1) and Table 2
Data were analyzed by 2-way factorial analysis of variance
Summary
Known as White Spot Lesion (WSL), is an unwelcomed but common occurrence in patients undergoing orthodontic treatment with fixed appliances [1]. The reported prevalence of WSLs associated with. 1030 The Open Dentistry Journal, 2018, Volume 12 fixed appliances ranges from 15% to 85% [2 - 4]. The higher risk for developing WSLs in orthodontically treated patients is attributed to the fixed appliances that create plaque retention sites, limit the naturally occurring self-cleansing mechanism of the oral musculature and saliva, and make proper cleaning around orthodontic brackets difficult [4, 5]. The majority of WSLs can re-mineralize after removal of orthodontic appliances, many of these lesions are irreversible, which can pose a cariogenic and cosmetic problem for many orthodontically treated patients [6, 7]. Vigilant oral hygiene regimen and frequent application of fluoride have been deemed the most efficient method for preventing WSLs [8, 9] the effectiveness of these methods is directly related to the patient’s full compliance which is unlikely, as highlighted by some studies [10 - 13]
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