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The objective of this prospective clinical trial was to assess the influence of the type of prosthetic restoration as well as the degree of hard-tissue loss on 7-year clinical performance of endodontically treated teeth restored with fiber posts. Two groups (n=60) were defined depending on the type of prosthetic restoration needed: (1) single unit porcelain-fused to metal (PFM) crowns (SCs) and (2) 3-4 unit PFM fixed dental prostheses (FDPs). Within each group, samples were randomly divided into 2 subgroups (n=30) according to the amount of residual coronal tissues after abutment build-up and final preparation: (A) more than 50% of coronal residual structure, (B) equal to or less than 50% of coronal residual structure. The clinical outcome was assessed based on clinical and intra-oral radiographic examinations at the recalls after 6, 12, 24, 36, 48 and 84 months. Data were analyzed by Kaplan-Meier Log Rank test and Cox regression analysis (p<0.05). The overall 7-year survival rate of endodontically treated premolars restored with fiber post and either PFM SCs or FDPs was 69.2%. The highest 84-months survival rate was recorded in Group 1A (90%), whereas teeth in Group 2B exhibited the lowest performance (56.7% survival rate). The Log Rank test detected statistically significant differences in survival rates among the groups (p=0.048). Cox regression analysis revealed that the amount of residual coronal structure (p=0.041) and the interaction between the type of prosthetic restoration and the amount of residual coronal structure (p=0.024) were statistically

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The purpose of the present study was to compare two different surgical procedures, connective tissue graft and guided bone regeneration, when applied in conjunction with implant placement. Probing pocket depth and the recession depth were recorded at the implant site after crown placement (T₁) and at the 1-year follow-up (T₂), while the keratinized tissue height and the buccal mucosa thickness were recorded at three different time points: at the time of implant surgery (T₀), after crown placement, and at the 1-year follow-up. No statistically significant differences in peri-implant mucosa thickness, recession, or other periodontal parameters were recorded at adjacent teeth.