A New Approach for Root Surface Biomodification Using Injectable Platelet-Rich Fibrin (I-PRF).

BACKGROUND This study investigated the potential effects of Injectable Platelet-Rich Fibrin (I-PRF) on root coverage of free gingival graft surgery. MATERIAL AND METHODS A total of 40 patients with Miller class I or II gingival recession were included. The patients who participated in this study were randomly divided into 2 groups, including the control and experiment groups. The patients in the control group were treated only with free gingival graft (FGG). The patients in the experiment group were treated with free gingival graft and injected with I-PRF as a root surface biomodification agent (FGG+I-PRF). The patients were called back after 3 months, and the amount of exposed root surface was determined and compared to the preoperative findings. RESULTS The mean initial exposed root surface was 4.7±1.49 mm for the FGG+I-PRF group, 4.1±1.07 mm for the FGG group, and 4.4±1.31 mm for all subjects. Three months after the operation, the mean root surface coverage values of the 2 groups were 3.5±1.05 and 3.9±0.78 mm in the control and experiment groups, respectively. CONCLUSIONS The findings showed that the injection of Injectable Platelet-Rich Fibrin (I-PRF) had a positive effect on root coverage in free gingival graft surgery.

Evaluation of Marginal Fits of Crown Substructure Designs in Implant-Supported Abutments.

BACKGROUND The purpose of this clinical study was to compare the marginal adaptation of infrastructure design with 4 different techniques. MATERIAL AND METHODS Forty tissue-level implant abutments (NTA, Shorter) were inserted on implant analogs. The samples were placed randomly in the wax blocks in the arch form of the upper jaw so that there would be 10 in each group. Test samples were obtained using the conventional casting method (CC), milling from metal blocks method (MB), direct metal laser sintering method (LS), and Noritake Alliance (NA) system. Data were analyzed by ANOVA with t tests. RESULTS After porcelain oven-drying, marginal gaps of metal substructures obtained by using conventional casting and milling methods were observed to decrease. The smallest value of the marginal gaps was found in the Noritake (NA) system, and the largest value in the milling (MB) method before and after oven-drying. The marginal gap of the direct metal laser sintering method was not significantly different from the change in the marginal gap of other metal substructures (p>0.05). CONCLUSIONS The marginal gap of the substructures obtained using the direct metal laser sintering method was not significantly different from the change in marginal gap of other metal substructures (p>0.05).