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

MOHAMED, AHMED BASTAWY; ELNEMR, REHAM AHMED; Mekky, Mahmoud Abdallah

doi:10.21608/aadj.2025.350205.1200

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.

10.21608/aadj.2025.350205.1200

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.

Keywords