Effect of Immediate-dentin-sealing on Adaptation of CAD/CAM-ceramic-crown-restoration

Objectives: The immediate-dentin-sealing(IDS) provides several benefits to metal-free inlay/onlay restoration. However, the evidence of IDS application for crown restoration was limited. The aim of this study was to evaluate effect of IDS on adaptation of CAD/CAM ceramic crown restoration for canine, premolar and molar.
Methods: Three types of mandibular model teeth(canine, premolar and molar, typodont model, Nissin) were prepared following general CAD/CAM ceramic crown preparation method using a custom-made cavity duplicator. Each prepared original tooth-specimen was duplicated by a dental product company to standardize abutment form. The duplicated abutment model teeth were divided into two groups, IDS application group(S+) or no-IDS application group(S-). For S+ group specimens, IDS was applied using an all-in-one adhesive system and a flowable composite(Clearfil Universal Bond Quick and Clearfil Majesty ES Flow, Kuraray Noritake Dental). Unpolymerized superfacial part of IDS was removed with ethanol. Then, all specimens were scanned, and the CAD/CAM ceramic crowns(VITABLOCS Mark II, VITA) were fabricated by CEREC system (CEREC AC Omnicam SW4.3 and MC XL, Dentsply Sirona). Individual crown for each scanned abutment was cemented using an adhesive resin cement(PANAVIA V5, Kuraray Noritake Dental). All restoed-specimens were stored in 37°C water for 1 hour. Each specimen was sectioned twice along bucco-lingual and mesio-distal dimension. Sectioned surfaces were polished and observed to measure adaptation using a light microscope(n=5). The data were analyzed by Mann–Whitney U test.
Results: Canine: The adaptation of S+ group was significantly superior to that of S- group at gingival-axial transition-portion. Premolar: The adaptation of S+ group excelled significantly at axial-occlusal transition-portion and occlusal wall except distal sectioning surface. Molar: The adaptation of S+ group, at gingival-axial transition-portion, axial wall and axial-occlusal transition-portions of buccal and mesial sectioning surfaces, was superior to S- group.
Conclusions: Immediate dentin sealing improved adaptation of CAD/CAM ceramic crown restoration for canine, premolar and molar.