|
KMID : 1023820140060040253
|
|
The Journal of Advanced Prosthodontics
2014 Volume.6 No. 4 p.253 ~ p.258
|
|
|
Gap comparison between single crown and three-unit bridge zirconia substructures
|
|
Chuchai Anunmana
Masnisa Charoenchitt
Chanavut Asvanund
|
|
|
Abstract
|
|
|
PURPOSE : To compare marginal and internal gaps of zirconia substructure of single crowns with those of three-unit fixed dental prostheses.
MATERIALS AND METHODS : Standardized Co-Cr alloy simulated second premolar and second molar abutments were fabricated and subsequently duplicated into type-III dental stone for working casts. After that, all zirconia substructures were made using Lava™ system. Marginal and internal gaps were measured in 2 planes (mesial-distal plane and buccal-palatal plane) at 5 locations: marginal opening (MO), chamfer area (CA), axial wall (AW), cusp tip (CT) and mid-occlusal (OA) using Replica technique.
RESULTS : There were significant differences between gaps at all locations. The mean ± SD of marginal gap in premolar was 43.6 ± 0.4 μm and 46.5 ± 0.5 μm for single crown and 3-unit bridge substructure respectively. For molar substructure the mean ± SD of marginal gap was 48.5 ± 0.4 μm and 52.6 ± 0.4 μm for single crown and 3-unit bridge respectively. The largest gaps were found at the occlusal area, which was 150.5 ± 0.5 μm and 154.5 ± 0.4 μm for single and 3-unit bridge premolar substructures respectively and 146.5 ± 0.4 μm and 211.5 ± 0.4 μm for single and 3-unit bridge molar substructure respectively.
CONCLUSION : Independent-samples t-test showed significant differences of gap in zirconia substructure between single crowns and three-unit bridge (P<.001). Therefore, the span length has the effect on the fit of zirconia substructure that is fabricated using CAD/CAM technique especially at the occlusal area.
|
|
|
KEYWORD
|
|
|
CAD/CAM, Ceramics, Zirconia, Marginal fit, 3-unit bridge
|
|
|
FullTexts / Linksout information
|
|
|
|
|
Listed journal information
|
|
  
|