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A Randomized Controlled Trial to Evaluate and Compare the Vertical Marginal Fit of Monolithic Zirconia Crowns
Rushikesh Narsing Kaknale1, Rajiv Kumar Gupta1, Akshay Bhargava1
1Department of Prosthodontics and Crown and Bridge, Santosh Dental College and Hospital, Pratap Vihar, Ghaziabad, Uttar Pradesh, India.
Background:
The marginal fit of dental restorations is a critical factor influencing their longevity and clinical success. With the advent of digital dentistry, intraoral scanning has emerged as an alternative to conventional impression techniques.
Methods:
This in vivo study included 20 patients requiring mandibular first molar crowns. A total of 40 crowns were fabricated and divided into two groups: Group A (n = 20) using conventional monophase impression technique and Group B (n = 20) using the digital impression technique. All teeth were prepared with a chamfer finish line. The marginal adaptation was evaluated using the silicone replica technique, and measurements were taken at four points (mid-buccal, mid-lingual, mid-mesial, and mid-distal) under a stereomicroscope.
Results:
The mean marginal discrepancy for Group A (conventional) was 107.69 ± 32.67 µm, while Group B (digital) showed a mean of 100.41 ± 35.53 µm. No statistically significant difference was found between the two groups (P = 0.504). Regional analysis also revealed no significant differences at any measurement point (buccal: P = 0.929; lingual: P = 0.866; mesial: P = 0.355; distal: P = 0.445). Both groups demonstrated marginal discrepancies within the clinically acceptable range of 120 µm.
Conclusion:
Both conventional monophase impression and digital intraoral scanning techniques produce monolithic zirconia crowns with clinically acceptable marginal fit.
