Clearfil dc core automix one

This study employed an experimental core build-up material based on the commercially available Clearfil DC Core Automix One (74 wt% filler load, Kuraray Noritake Dental, Tokyo, Japan) with two different amounts of filler content presented as weight percentages (+2.5 and +5 wt%). The chemical formulations of the materials used are shown in Table 1.

Before abutment build-up, 40% phosphoric acid (Ketchant GEL, Kuraray Noritake Dental, Tokyo, Japan) was applied to each FRC post (1.6 mm in diameter, Fiber post, GC, Tokyo, Japan); these were washed with water, dried, then silane coupling agent (CERAMIC PRIMER II, GC) was applied. A bonding agent (Clearfil ® Universal Bond, Kuraray Noritake Dental) was applied to the root canal walls, aired for 10 s with mild air, and then irradiated for 10 s with an LED irradiator. An abutment was built up via direct method using the FRC post and resin (Clearfil ® DC Core Automix ® ONE, Kuraray Noritake Dental). The height of the build-up was 3 mm from the margin. Each specimen was light irradiated for 40 s from 5 directions. The abutment tooth was prepared at an axial inclination of 6° with deep chamfer preparation using a surveyor and diamond bur (101 LRD, Shofu).

First, 40% phosphoric acid (K-Etchant GEL, Kuraray Noritake Dental, Tokyo, Japan) was applied to the FRC post (1.6 mm diameter, fiber post, GC, Tokyo, Japan), which was then washed with water and dried. Subsequently, a silane coupling agent (CERAMIC PRIMER II, GC) was used. A bonding agent (Clearfil ® Universal Bond, Kuraray Noritake Dental) was applied inside the root canal, and after 10 s of mild air blowing, the root canal was irradiated with an LED light-curing unit (Blueshot, SHOFU) for 10 s. Subsequently, the abutment was built up via the direct method using the FRC post and resin composite for abutment and core (Clearfil ® DC Core Automix ® ONE, Kuraray Noritake Dental). The height of the buildup from the margin was set to 3 mm. Light irradiation with an LED lightcuring unit was performed on the occlusal surface and mesiodistal and buccolingual sides for 40 s each. Finally, a diamond point creates a deep chamfer around the abutment with an axial inclination of 6°, using a surveyor for partial denture.