Sameer Quraeshi, Fazal Ghani, Yawar Ali Abidi, Saqib Rashid, Ahsan Iqbal, Huda Shiraz.
Clinical Evaluation of Two Types of Cores for Support of Metal-Ceramic Full-Coverage Crowns on Endodontically Treated Premolars.
J Pak Dent Assoc Jan ;20(1):5-9.

OBJECTIVE: Premolars having smaller dimensions when exhibit structural-compromise require specific restorative and endodontic considerations. This study reports the efficacy of two core-buildup techniques for supporting artificial crowns on endo-treated structurally compromized premolars. METHODOLOGY: This study was conducted in Fixed Prosthodontics Department, Fatima Jinnah Dental Hospital, Karachi (Pakistan). Treatment-outcome scores based on clinical and radiographic examination, for endodontically treated premolar teeth restored with either a titanium post-resin-core or Nayyar-core supporting metal-ceramic crowns were recorded. These were recorded in 202 patients, during January 2008 November 2009, through follow-up of the restorations at 1, 2 and 3 months post-restoration periods. Data included the recording of patients’ age, tooth location, the extent of structural-deficit, the type of restoration. Using 5 determinants of treatment-outcome for the restored teeth, individual and mean scores for teeth were recorded. The score for each of the 5 determinants of treatment outcome was either 0 or 1 thus giving a total score ranging from 0 to 5. A higher score-value indicated poorer treatment outcome. Scores were compared and analyzed statistically using descriptive statistics and Chi-square test . RESULT: Patients had mean age 37.3 + 11.7 years. Teeth with Nayyar-core supported crowns was done in 128 (65.3%) cases as compared to post-resin-core supported crowns in 74 (34.7%) cases. Association between tooth structure loss and restoration type was statistically significant (P-value < 0.05). All teeth restored with Nayyar-core had > 1 wall remaining as compared to having 1 or 2 remaining walls in teeth restored with post-resin-core-crowns. At each follow-up examination, there was no significant difference between the mean outcome scores for teeth restored with Nayyar-core or post-resin-core. CONCLUSION: Irrespective of the varying tooth-structure deficit, both types of cores proved effective in supporting artificial crowns during the follow-up period.

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