Scanning electron microscopy evaluation of dentin ultrastructure after surface demineralization.

Context: Knowledge about dentin microstructure is essential for execution of clinical procedures which require adhesion of materials to dentin.

Aims: To evaluate by scanning electron microscopy (SEM) the dentin ultrastructure after demineralization with 6 M and 12 M hydrochloric acid (HCl).

Subjects And Methods: Twenty dentin segments were immersed in fixative solution and dehydrated in ethanol.

Physical-Mechanical Properties of a Resin-Modified Calcium Silicate Material for Pulp Capping.

The purpose of this study was to investigate and to compare the physical-mechanical properties of a resin-modified calcium silicate material (TheraCal LC), used for pulp-capping, to MTA (Angelus) and a calcium hydroxide cement (Dycal). Specimens of each material (n=12) were prepared in Teflon molds (3.58 mm x 3 mm) and measured before and after immersion in distilled water for 24 h and 30 days to evaluate the dimensional change.

Effect of passive ultrasonic irrigation on diffusion of hydroxyl ion through radicular dentine.

Objective: This study investigated the effect of passive ultrasonic irrigation (PUI) on diffusion of hydroxyl ions through radicular dentine.

Materials And Methods: After chemomechanical preparation of root canals in 60 human teeth, the cementoenamel junction and the apical 3 mm of each root were covered with fast-setting adhesive. Four final irrigation protocols were applied (n = 10): group (G)1: irrigation with EDTA + NaOCl; G2: EDTA + PUI + NaOCl; G3: EDTA+(NaOCl + PUI); G4: (EDTA + PUI) + (NaOCl + PUI).