Citation Information :
Sultan D, Engelmeier RL, Kunkel T, Azarbal M. Computer-aided Design/Computer-aided Manufacturing Generated Ceramic Post and Core. Int J Prosthodont Restor Dent 2018; 8 (3):72-78.
Purpose: To evaluate the efficacy of computer-aided design/ computer-aided manufacturing (CAD/CAM) technology to fabricate an all-ceramic post and core restoration.
Materials and methods: Two master dies fabricated from a polymer material were used in this study (Acadental T Endo TM series RT_AE 401_0®8). The coronal portion of the die simulated an ideal core preparation with a 1.5 mm to 2.0 mm ferrule. The intracanal space for the first and second dies were prepared for a post length of 10 mm and 14 mm respectively. Each die was scanned 20 times. A total of 40 e.max® CAD/ CAM post and core restorations were milled. The restorations were evaluated for a precision of fit by measuring marginal gap for each post and core restoration using scanning electron microscopy and by taking radiograph to determine the post length.
Results: Results revealed that: (a) Chairside CAD/CAM Technology (Sirona CEREC BlueCam®) could produce directly all ceramic post and core restorations up to 10.0 mm of canal depth. (b) There was no pattern of relationship between the marginal gap and post lengths when comparing the two test groups.
Conclusion: The least detectable gap was 5 microns, and the greatest was 100 microns. The marginal gap results found in this study met clinically acceptable standards.
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