Impact of Preparation Designs and Distinct restorations on Marginal Precession, and Fracture Resistance of CAD/CAM Fabricated Endocrowns in Pulpally Treated Deciduous Molars

Document Type : Original Article

Authors

1 PEDIATRIC DENTISTRY and DENTAL PUBLIC HEAKTH,FACULTY Of ORAL and DENTAL MEDICINE, SOUTH VALLEY UNIVERSITY

2 pediatric dentistry, suez canal university, Ismailia, Egypt

3 fixed prosthodontics, faculty of oral and dental medicine, south valley university, Qena, Egypt.

Abstract

Aim: This study aimed to evaluate the impact of preparation designs and distinct 
restorations on marginal Precession, and fracture resistance of CAD/CAM fabricated 
endocrowns in pulpally treated Deciduous molars. Subjects and Methods: in-vitro 
experimental study involved 60 primary molar teeth, which underwent pulpotomy and 
standardized endo crown preparation. The utilized teeth were split into 6 groups by 
random method (10 teeth/group) depending on the restorative material used G 1: sound 
primary molars, G 2: pulpotomized primary molars with no coronal restoration, G 3: 
restored with Beautifil Flow Plus X, G 4: restored with CAD/CAM Milled Poly-methyl 
methacrylate., Group 5: restored using lithium disilicate endocrown. G 6: restored by 
CAD/CAM Milled dental zirconia block. All samples were exposed to fracture testing 
using a universal testing machine with compressive power applied. Results: in regard to 
Fracture resistance, half depth: Zirconia had the greatest mean value, then Composite, 
E. max, and the PMMA group. All groups were statistically significant. Complete 
depth: Zirconia had the greatest mean value, which was followed by the PMMA group, 
Composite, and E. max. One-third of the samples in the zirconia group displayed a good 
fracture, while 33.3% of the samples in the E-max group revealed a fractured tooth and 
restoration. Conclusion: Within the parameters of this investigation, our work implies 
that teeth treated with a pulpotomy may, therefore, be restored using endocrowns. 
The zirconia showed higher fracture resistance than composite, PMMA and lithium 
disilicate endocrowns. Marginal gap is higher in PMMA than other material.

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