Marginal and Internal Gap of Metal Copings Fabricated Using Three Types of Resin Patterns with Subtractive and Additive Technology: An In Vitro Comparison oleh Hemavardhini Addugala, Vidyashree Nandini Venugopal, Surya Rengasamy, Pradeep Kumar Yadalam, Nassreen H. Albar, Ahmed Alamoudi, Sarah Ahmed Bahammam, Bassam Zidane, Hammam Ahmed Bahammam, Shilpa Bhandi, Deepti Shrivastava, Kumar Chandan Srivastava, Shankargouda Patil