Abstract
This study evaluated the diffusion through the dentinal tubules of hydroxyl ions from different calcium hydroxide (CH) pastes containing Aloe vera. Sixty single-rooted bovine teeth were used. The tooth crowns were removed, the root canals were instrumented and the specimens were assigned to 4 groups (n=15) according to the intracanal medication: Group CH/S - CH powder and saline paste; Group CH/P - CH powder and propylene glycol paste; Group CH/A - calcium hydroxide powder and Aloe vera gel paste; Group CH/A/P - CH powder, Aloe vera powder and propylene glycol paste. After placement of the root canal dressings, the teeth were sealed coronally and apically with a two-step epoxy adhesive. The teeth were placed in identified flasks containing deionized water and stored in an oven with 100% humidity at 37 °C. After 3 h, 24 h, 72 h, 7 days, 15 days and 30 days, the deionized water in the flasks was collected and its pH was measured by a pH meter. The obtained data were subjected to statistical analysis at a significance level of 5%. The results demonstrated that all pastes provided diffusion of hydroxyl ions through the dentinal tubules. The combination of Aloe vera and CH (group CH/A) provided a constant release of calcium ions. Group CH/A/P showed the highest pH at 24 and 72 h. In conclusion, the experimental pastes containing Aloe vera were able to enable the diffusion of hydroxyl ions through the dentinal tubules.
Highlights
Calcium hydroxide (CH) is the standard material for root canal dressing, being widely used in Endodontics [1]
The antimicrobial activity and capacity to limit root resorption are related to the alkalinizing action of calcium hydroxide, which in turn is a consequence of its ionization into hydroxyl ions [7,8,9]
This study evaluated the diffusion of hydroxyl ions through the dentinal tubules from different CH pastes containing Aloe vera
Summary
Calcium hydroxide (CH) is the standard material for root canal dressing, being widely used in Endodontics [1]. This drug was introduced in Endodontics in 1920 by Hermann and has been used in different clinical situations since [2]. The antimicrobial activity and capacity to limit root resorption are related to the alkalinizing action of calcium hydroxide, which in turn is a consequence of its ionization into hydroxyl ions [7,8,9]. Other important characteristic of the dissociation of CH into hydroxyl ions is the ability to inactivate bacterial lipopolysaccharide (LPS), a toxin produced by Gram-negative bacteria commonly found in the root canal system [4,6]
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