TY - JOUR
T1 - Effect of operators' experience and cement space on the marginal fit of an in-office digitally produced monolithic ceramic crown system
AU - Baig, Mirza Rustum
AU - Gonzalez, Maria Angela G.
AU - Kasim, Noor Hayaty Abu
AU - Kassim, Noor Lide Abu
AU - Farook, Mohideen Salihu
N1 - Includes bibliographical references.
PY - 2015
Y1 - 2015
N2 - Objectives: To investigate the marginal accuracy of Cerecthree-dimensional (3D) all-ceramic crowns, in terms of gap and overhang, and to analyze the “operators’ experience” and “cement space” effects on the marginal fit. Method and Materials: Thirty virtual models were obtained from a metal master die by scanning by three different operators: operator 1 (novice), operator 2 (beginner), and operator 3 (expert) (n = 10). These were further divided into two subgroups of five each, based on the cement space settings: 10 μm and 20 μm. Monolithic ceramic crowns (n = 10) were designed and milled for each virtual model and subjected to marginal gap and overhang evaluation at six designated margin locations. The influence of operators’ experience and cement space on the marginal fit of the crowns was assessed by performing Box tests and MANOVA (multiple analysis of variance) (α = .05). Kruskal Wallis test was also used to analyze the interactions between the operators’ experience and the cement space. Results: The overall mean ± SD marginal gaps and overhangs for the Cerec 3D crowns, were 154 ± 56 μm and 74 ± 74 μm for novice, 158 ± 53 μm and 86 ± 66 μm for beginner, and 155 ± 52 μm and 47 ± 76 μm for expert, respectively. The MANOVA and Kruskal Wallis tests found no significant differences (P > .05) between the operators, in terms of gap and overhang, for all cement settings. Conclusion: The operator experience did not seem to influence the marginal accuracy ofCerec 3D fabricated crowns.
AB - Objectives: To investigate the marginal accuracy of Cerecthree-dimensional (3D) all-ceramic crowns, in terms of gap and overhang, and to analyze the “operators’ experience” and “cement space” effects on the marginal fit. Method and Materials: Thirty virtual models were obtained from a metal master die by scanning by three different operators: operator 1 (novice), operator 2 (beginner), and operator 3 (expert) (n = 10). These were further divided into two subgroups of five each, based on the cement space settings: 10 μm and 20 μm. Monolithic ceramic crowns (n = 10) were designed and milled for each virtual model and subjected to marginal gap and overhang evaluation at six designated margin locations. The influence of operators’ experience and cement space on the marginal fit of the crowns was assessed by performing Box tests and MANOVA (multiple analysis of variance) (α = .05). Kruskal Wallis test was also used to analyze the interactions between the operators’ experience and the cement space. Results: The overall mean ± SD marginal gaps and overhangs for the Cerec 3D crowns, were 154 ± 56 μm and 74 ± 74 μm for novice, 158 ± 53 μm and 86 ± 66 μm for beginner, and 155 ± 52 μm and 47 ± 76 μm for expert, respectively. The MANOVA and Kruskal Wallis tests found no significant differences (P > .05) between the operators, in terms of gap and overhang, for all cement settings. Conclusion: The operator experience did not seem to influence the marginal accuracy ofCerec 3D fabricated crowns.
KW - Cerec
KW - Ceramic
KW - Digital
KW - Marginal fit
KW - Crown
U2 - 10.3290/j.qi.a34722
DO - 10.3290/j.qi.a34722
M3 - Article
C2 - 26345105
SN - 0011-8567
VL - 47
SP - 181
EP - 191
JO - Quintessence International: clinically relevant, scientifically based
JF - Quintessence International: clinically relevant, scientifically based
IS - 3
ER -