|
KMID : 1035320190460030153
|
|
Korean Society for Dental Materials
2019 Volume.46 No. 3 p.153 ~ p.164
|
|
|
Comparison of marginal and internal discrepancies of zirconia crowns fabricated by various digital scan methods
|
|
In Hee-Sun
Cho Hye-Won
Jung Ji-Hye
Kim Jeong-Mi
Kim Yu-Lee
|
|
|
Abstract
|
|
|
In this study, marginal and internal discrepancies of zirconia crowns fabricated with the CAD/CAM (computer aided design ? computer aided manufacturing) system were compared. Digital impressions were obtained using model scan (MS), impressionscan (IS), oral scan (OS) and dental CT scan (CT). The left mandibular first molar resin tooth was prepared as occlusal 2mm, axial 1 mm reduction with convergence angle of 6 degree and shoulder margin. After fifteen scan procedures per group,each fifteen zirconia crowns were fabricated. The marginal and internal discrepancies of the crowns were measured using asilicone replica technique with a light body silicone impression material. The replica specimens were sectioned buccolinguallyand mesiodistally and then examined using a microscope ×160 magnification. The data were statistically analyzed with one-wayANOVA and post-hoc was Duncan’s multiple test (α=0.05). Mean marginal discrepancies of zirconia crowns were significantlylower in OS group and MS group than in IS group and CT group. Mean cervical discrepancies were a statistically significantdifference (p<0.05) in the OS group compared to the other groups (p<0.05). The CT group and the MS group did not showany significant difference (p>0.05). The IS group showed the lowest axial discrepancies and the MS group showed the greateststatistically significant difference (p<0.05). There was no significant difference between the OS group and the CT group (p>0.05).
The occlusal discrepancies were the lowest in OS group and the largest in CT group, indicating a significant difference (p<0.05).
The MS group showed no statistically significant difference from the OS group and the IS group. The marginal discrepanciesand cervical discrepancies of the zirconia crowns were lowest in the OS group and the axial discrepancies were lowest inthe IS group. All groups except the CT group were within the clinically acceptable range.
|
|
|
KEYWORD
|
|
|
Dental CT, Internal discrepancies, Marginal discrepancies, Model scanner, Oral scanner, Zirconia crown
|
|
|
FullTexts / Linksout information
|
|
|
|
|
Listed journal information
|
|
|