Comparison of Fracture resistance and Microleakage of Two Types of Primary Molar’s Crown with Two Luting Cements: An In Vitro Study

Document Type : Original Article

Authors

1 BDS, Buraydah Colleges, KSA, External Residence of Pediatric Dentistry and Dental Public Health Department, Faculty of Dentistry, Mansoura University, Egypt.

2 Professor of Pediatric Dentistry, Faculty of Dentistry, Mansoura University, Egypt

3 Lecturer of Pediatric Dentistry, Faculty of Dentistry, Mansoura University, Egypt

Abstract

Objective: This study assessed and compared both the fracture resistance (FR) and microleakage (ML) of esthetic prefabricated zirconia crowns (PZCs) with CAD/CAM-manufactured hybrid ceramic crowns for primary molars, using two different types of luting cements.
Material and Methods: Sixty-four sound or simply carious mandibular second primary molars were divided into two equal groups (n=32) based on crown material fabrication: prefabricated zirconia (NuSmile ZR) for Group 1, and CAD/CAM hybrid ceramic (Grandio disc) for Group 2. Each group was further divided into two subgroups (n=16) by luting cement: conventional glass ionomer (Subgroup A) or self-adhesive resin cement (Subgroup B). After crown cementation and thermal cycling, 8 teeth from each subgroup were used for FR testing, and the remaining 8 for ML testing. Statistical analysis was performed at p ≤ 0.05.
Results: Regarding FR, the highest mean value (1930.28 N) was recorded for Zr crowns cemented with resin cement, while the lowest value (803.97 N) was measured for CAD/CAM-fabricated hybrid ceramic crowns cemented with glass ionomer cement. For ML, the highest value (4.00 µ) was recorded for both crown systems cemented with glass ionomer cement, while the lowest one (2.00 µ) was found when PZCs were cemented using resin cement.
Conclusions: The luting cement has a significant influence on the ML of crown restorations for primary molar teeth, while the crown material has not. Compared to conventional glass ionomer cement, self-adhesive resin cement has a significant positive impact on both the FR and ML.

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Egyptian Dental Journal
Volume 71, Issue 4 - Serial Number 1
October (Orthodontics, Pediatric & Preventive Dentistry)
October 2025
Pages 2791-2804

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