Influence of Intraoral Temperature and Relative Humidity on the Dentin Bond Strength: An in Situ Study

Abstract

Some conditions of intraoral temperature and relative humidity may not impair the dentin bond strength of two-step etch-and-rinse adhesive systems. Thus, an adequate relative isolation seems to be a good alternative under the specific clinical conditions in which rubber dam isolation is either impossible or very difficult to perform.

A comparison of the accuracy of intraoral scanners using an intraoral environment simulator

“…A chamber to simulate intraoral conditions was used in other studies to investigate dentin bond strength 16 or microleakage of adhesive systems. 17 However, the chamber used in this study was limited to experiments of intraoral scanners.…”

Conceptualisation, Development, Fabrication and In Vivo Validation of a Novel Disintegration Tester for Orally Disintegrating Tablets

“…The test housing was placed on top of a hot plate, set to an optimised temperature to achieve 37 ± 1 °C within the compartment, similar to in vivo conditions 3 . The test housing contained potassium chloride which was used to form a saturated salt solution to provide relative humidity of approximately 93 ± 3% RH in the enclosed container, similar to those conditions encountered in the oral cavity 17 . The disintegration bed was a slightly flattened silicone pipe with 4 mm holes to allow water or simulated saliva to flow over the surface of the pipe.…”

Clinical observation of the tooth surface during air-drying of self-etching primer under 3D video microscope

“…Saraiva et al [11] reported that both temperature and relative humidity in incisor site was significantly lower than molar site under the room condition. Therefore, the evaporation of the remaining solvent in the anterior cavity might be easier than at other sites, even when the intra-oral vacuum device was used.…”

“…Relative humidity at molar sites is close to 100 % [9][10][11]. Resin bonding in a high humidity environment has been reported to reduce bond strength [11,12,39]. Therefore, it is recommended to restore posterior teeth under humidity-controlled conditions.…”

“…However, insufficient air-drying of self-etching primer could leave residual solvent that could subsequently cause incomplete polymerization of the bonding resin. While some manufacturers provide instructions about the duration of air-drying, the extent of the removal of the solvent might be affected by several factors, such as the quality of the dry-field technique/isolation, the site and form of the cavity, because oral cavity is very humid [9,10], and therefore it is difficult to remove the solvent by air-drying [11]. Although there are many factors that affect solvent removal [11][12][13][14][15], the actual duration required for solvent evaporation in the clinical situation has not yet been established.…”