EVALUATION OF THE MARGINAL DISCREPANCY ON IMPLANT ABUTMENTS WITH CROWNS FABRICATED BY CAD/CAM TECHNOLOGY

Abstract

This was an experimental in vitro study using CAD/CAM-fabricated implant abutments and crowns. For mandibular first molars, a total of twenty-five implant analogs measuring 4.3 mm in diameter, 10 mm in length, and 5.5 mm in height were obtained for the straight abutment. Using CAD/CAM technology, 25 first molar crowns were created on these implant abutments. Following the cementation of crowns on implant abutments, caries exploration was used to assess the marginal irregularity. Using a stereomicroscope, marginal gaps were assessed on twelve sites on the buccal, lingual, mesial, and distal surfaces. Data were gathered on data collecting sheets following evaluation. With SPSS, statistical analysis was carried out. A percentage was used to express marginal irregularity. The marginal gaps were compared using the Friedman Test. According to the findings, every specimen had a score of 0 (smooth probing, no abnormalities), meaning that there were no marginal irregularities in any of the specimens. On all surfaces, the marginal gaps ranged from 2.99 to 29.03µm. The buccal surface had the largest mean ± Sd value of the marginal gap, 9.897±5.755 µm, while the distal surface had the lowest, 6.719±2.419 µm. 7.816±3.873 µm was the total Mean ±SD of the marginal gap. Between the Buccal-lingual and Buccal-Distal groups, there were observed to be significantly different marginal gaps. The area of the crown margin was responsible for varied marginal gaps, and it can be stated that the marginal gaps detected in CAD/CAM manufactured crowns on dental implant abutments were within a clinically acceptable range.