Role of phosphate-buffered saline on push-out bond strength of MTA Flow™ and Biodentine™ after acid challenge: An in vitro study.

Context: The physical and chemical properties of root repair materials are adversely affected when placed in areas of inflammation with acidic pH. Aim: To evaluate the role of phosphate-buffered saline (PBS- pH 7.4) on push-out bond strength (POBS) of MTA flow and Biodentine (BD) after acid challenge with butyric acid buffered solution (BABS- pH 5.4). Subjects and Methods: Eighty mid-root dentin slices (2 mm thick; 1.3 mm lumen diameter) were prepared and were divided into two groups (n = 40) based on the type of material used for filling lumen: Group 1-MTA Flow and Group 2-BD. Each group was again divided into four subgroups (n = 10) based on the duration of exposure to storage media: (a) 3 days in PBS, (b) 3 days in BABS, (c) 3 days in BABS followed by 30 days in PBS, and (d) 33 days in PBS. POBS was then measured using the universal strength testing machine. Statistical Analysis Used: Statistical analysis was performed with one-way analysis of variance and post hoc test using SPSS software version 23.0. Results: Group 1b and 2b showed significantly lower bond strength values. No significant difference was observed between Group 1b and Group 1c (P > 0.05), whereas highly significant POBS values were observed between Group 2b and Group 2c (P = 0.000). Among all the tested groups, Group 2d showed the highest POBS values. Conclusion: On storage in PBS after acid challenge, BD attained the highest POBS values while no significant difference was observed in MTA Flow.

One-year comparative evaluation of Ketac Nano with resin-modified glass ionomer cement and Giomer in noncarious cervical lesions: A randomized clinical trial.

AIM: The purpose of this study was to evaluate the clinical performance of Ketac Nano (Ketac™ N100), RMGIC (Fuji Filling™ LC), and Giomer (Beautifil® II) in noncarious cervical lesions (NCCLs). MATERIALS AND METHODS: One operator restored 120 NCCLs in 20 subjects, with at least two lesions restored with one of the restorative materials: RMGIC (control group), Giomer and Ketac Nano (experimental groups). Two observers evaluated retention, marginal discoloration, marginal adaptation, color match, surface roughness, and postoperative sensitivity using modified USPHS criteria at baseline, 6, and 12 months. STUDY DESIGN: Double-blinded randomized clinical trial (RCT). STATISTICAL ANALYSIS: Kruskal-Wallis test, Mann-Whitney U-test, Wilcoxon matched-pairs test. RESULTS: There was statistically significant difference observed between Giomer, Ketac Nano and RMGIC after 12 months (P < 0.05). There was a significant decrease in retention rates for Giomer (P = 0.0050), increased marginal discoloration and color mismatch for Ketac Nano (P = 0.0025, P = 0.0053), increased surface roughness and color mismatch with RMGIC (P = 0.0022, P = 0.0077) from baseline to 12 months. CONCLUSION: Within the limitations of this RCT of 12 months, Ketac Nano and RMGIC restorations were better retained in NCCLs while superior color match and surface finish were observed with Giomer restorations.

Fracture Fragment Reattachment Using Projectors and Anatomic everstick Post™: An Ultraconservative Approach.

Traumatized anterior teeth require quick functional and esthetic repair. Tooth fragment reattachment is a simple and conservative clinical procedure to restore fractured anterior teeth. Different techniques of reattachment include enamel beveling, "v-" shaped internal enamel and dentin grooves, external chamfer, over contouring, and by placing fiber post, all of which were invasive methods. This article describes a novel technique of reattachment using canal projectors for stabilizing fractured fragments followed by endodontic therapy and internal reinforcement with custom fiber post (everStick Post™, GC Corporation, Tokyo, Japan).

Detection and management of a complex canal configuration in mesiobuccal root of maxillary first molar using three dimensional imaging.

This case report discusses the identification and management of complex canal configuration of 3-2-1 in the mesiobuccal (MB) root of the maxillary left first molar. Careful attention to details of the pulpal floor and applying the knowledge of the laws of orifice location along with deepening the subpulpal groove with ultrasonic tips helped in identifying the three MB canals. Manual scouting helped in understanding the anatomic configuration; the use of three-dimensional imaging technique and spiral computed tomography (SCT) confirmed the same. SCT images showed buccolingually wide and bulbous mesiobuccal root with three separate canals at coronal third that merged into two canals in the middle and exited as a single canal at the apex. This article highlights the role of SCT in three-dimensionally analyzing the unseen rarest canal configurations that ultimately enabled the clinician to thoroughly explore, debride, and obturate the entire root canal system.

Shear bond strength evaluation of resin composite bonded to three different liners: TheraCal LC, Biodentine, and resin-modified glass ionomer cement using universal adhesive: An in vitro study.

AIMS: To compare and evaluate the bonding ability of resin composite (RC) to three different liners: TheraCal LC™ (TLC), a novel resin-modified (RM) calcium silicate cement, Biodentine™ (BD), and resin-modified glass ionomer cement (RMGIC) using an universal silane-containing adhesive and characterizing their failure modes. MATERIALS AND METHODS: Thirty extracted intact human molars with occlusal cavity (6-mm diameter and 2-mm height) were mounted in acrylic blocks and divided into three groups of 10 samples each based on the liner used as Group A (TLC), Group B (BD), and Group C (RMGIC). Composite post of 3 mm diameter and 3 mm height was then bonded to each sample using universal adhesive. Shear bond strength (SBS) analysis was performed at a cross-head speed of 1 mm/min. STATISTICAL ANALYSIS USED: Statistical analysis was performed with one-way analysis of variance (ANOVA) and post hoc test using Statistical Package for the Social Sciences (SPSS) version 20. RESULTS: No significant difference was observed between group A and group C (P = 0.573) while group B showed the least bond strength values with a highly significant difference (P = 0.000). The modes of failure were predominantly cohesive in Groups A and B (TLC and BD) while RMGIC showed mixed and adhesive failures. CONCLUSIONS: Hence, this present study concludes that the bond strength of composite resin to TLC and RMGIC was similar and significantly higher than that of BD following application of universal adhesive.