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Advanced Dental Care 2018 Dentistry and Craniofacial Research
ISSN: 2576-392X Page 27
October 08-09, 2018
Moscow, Russia
26th International Conference on
Advanced Dental Care
Purpose: The purpose of this study is to evaluate and compare
the effect of using different finishing line designs (deep chamfer
and shoulder) with different occlusal surface reduction schemes
(planar and flat) on the vertical marginal fit of full contour CAD/
CAM zirconia crown restorations.
Materials & Methodology: Thirty-two sound maxillary first
premolar teeth of comparable size and shape freshly extracted
for orthodontic purposes were collected to be used in this in vitro
study. To minimize confounding variables, one-way ANOVA test
was performed for each dimension and no statistically significant
difference was found among the four subgroups. Teeth were
divided into two main groups according to the design of finishing
line used (n=16): Group A: Deep chamfer; Group B: Shoulder.
Each group was then subdivided into two subgroups according
to the scheme of occlusal reduction used (n=8): (A1, B1) Planar;
(A2, B2) Flat. Standardized preparation for full contour zirconia
crown restorations was carried out with finishing lines depth 1.0
mm, total convergence angle of 6 degrees and axial height 4 mm
(buccally and palatally). The teeth were then scanned directly
using digital intra-oral scanner technique (Sirona AC Omnicam
camera). Full contour zirconia crowns were then fabricated using
Sirona In-Lab MC X5 milling device. Vertical marginal gaps were
measured at four points on each tooth surface using a digital
microscope with a magnification of (280X).
Results: The results of this study showed that there were
statistically highly significant differences (p<0.01) using one- way
ANOVA analysis and Student’s t-test.
Conclusions: Deep chamfer with planar occlusal reduction
scheme provided better marginal fit compared to that obtained
with shoulder. On the other hand, shoulder with flat occlusal
reduction scheme provided better marginal fit compared to that
obtained with deep chamfer.
Biography
Dr. Lena studied B.D.S in dentistry at Al Yarmouk University College, Lena S
Abdullah pursued her Master’ Degree in the Department of Restorative and
Aesthetic Dentistry from the College of Dentistry at the University of Bagh-
dad, Iraq & she is a specialist dentist .) in conservative and esthetic
department, she has a specialized dental health center in Morocco Street.
Baghdad Health Department Rusafa Municipalities Sector & Specialty Den-
tal Center in Alawiya from 2012 to 2013 in Baghdad, Iraq.
Lena S Abdulla and Adel F Ibraheem
University of Baghdad, Iraq
Lena S Abdulla et al., Dent Craniofac Res 2018, Volume 3
DOI: 10.21767/2576-392X-C4-012
The effect of finishing line designs and occlusal
surface reduction schemes on vertical marginal
fit of full contour CAD/CAM zirconia crown
restorations (a comparative in vitro study)