An Analysis of Clinical Effects and Failures of the PFM Restorations

Objective To observe clinical results of the PFM restorations and study causes of failure and find some solutions. Methods 1,705 units of 821 cases were divided into two groups and were analyzed.Common failures were porcelain fracture and cracks,retention loss of the PFM post crown, pontic fracture, pulpitis and apical periodontitis,gingivitis,gingival border color change, food impaction,space in the cervical margin, and low masticatory effect. Results 7.86% of the complications were found in the first group(40/1,705), while 0.75% were found in the second group(9/1,705). Conclusion It was important to design reasonably for improving tooth preparation techniques to protect dental pulp and provide adequate retention of pulpless tooth. The failure unit was avoided in time for decreasing complications when inadequacies or problems were present.