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*Safa AbdAlrahman Hussain and Assistant Professor Dr. Mohammed Abdul Hussain


Background: Computer aided design /Computer aided manufacture (CAD/CAM) system is gaining more importance in the fabrication of dental restoration and the minimization of crown and fixed partial denture marginal gaps is an important goal in prosthodontics. The purpose of this study was to Evaluation marginal accuracy of CAD CAM PMMA by used two types of dental scanner(Imes I core& DOF freedom dental scanner) on different type of die materials (peek and metal). Objective: Evaluation of marginal fit of CAD CAM PMMA material by two different types of dental scanners (Imes - Icore scanner & DOF scanner). Material and Method: An ideal prepared plastic right maxillary first molar with deep chamfer finishing line design was used as a pattern for fabrication master dies. The model was scanned and the master (metal & PEEK) dies were milled by CAD/CAM system. sixty PMMA crowns were fabricated on a metal& PEEK die and were divided into two major groups(30 crowns for each group) according to the dental scanner being used: first group: fabricated with Imes -Icore scanner; second group: fabricated with DOF freedom scanner. Each group further subdivided into two subgroups; 15crowns were fabricated on metal die and 15 crowns were fabricated on PEEK die for two major grope. Marginal gaps were evaluated on the master die at four defined points on each aspect (Buccal, Mesial, Lingual and Distal). Direct view technique was used with the aid of a digital microscope at a magnification of (110X) and (image J) program. Results: of this study showed that the lowest mean of marginal gap with crowns fabricated by DOF Freedom scanner on PEEK die (29.221±0.801μm); and highest mean of marginal gap with crowns fabricated on Metal die by Imes - Icore showed a mean marginal gaps (54.448 ± 1.687μm). The data were statistically analyzed, using T tests which revealed highly significant differences (p<0.001) among groups. Conclusion: Imes -Icore scanner showed the higher marginal gap than the DOF freedom scanner, PEEK die material show lower marginal gap compared with metal die material. All measurement within acceptable marginal gap clinically.

Keywords: CAD CAM Interim Material, Dental Scanners, Marginal Accuracy.

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