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Evaluation of Micro-Shear Bond Strength of Self-Adhesive FlowablP Giomer To Bovine Tooth

Wed, 01 Apr 2026 00:00:00 GMT

Title: Evaluation of Micro-Shear Bond Strength of Self-Adhesive FlowablP Giomer To Bovine Tooth Authors: Kim, Eunjin; Shin, Yooseok; Kim, Dohyun; Kim, Jeong-hee; Kim, Ran-ah; Park, Jeong-won Abstract: Purpose: Self-adhesive flowable giomer (SAG) has been used in dental practice recently to simplify clinical procedures and shorten chair times. However, there are only few studies evaluating its bond strength to enamel and dentin, resulting in a lack of evidence. The purpose of this study was to compare the micro-shear bond strength with and without adhesive in enamel and dentin to evaluate the self-adhesive ability of SAG. Methods and Materials: Sound bovine teeth were used as the tooth substrates. For & micro;-SBS tests, enamel and dentin specimens were prepared for SAG (Beautifil Kids SA-BK), a self-adhesive flowable composite (Vertise Flow-VF), and a nanohybrid flowable giomer (Beautifil Flow Plus F03-BF). Two adhesive modes were tested for BK and VF (with self-etching adhesive and no adhesive), and one for BF (with self-etching adhesive). The & micro;-SBS test was conducted after 24 h and after thermocycling for 10,000 cycles using a universal testing machine. Results: For all materials, when self-etching adhesive was used, the & micro;-SBS was significantly higherthan that of the no-adhesive group (P < 0.05). No statistically significant difference was found between the restorative materials under any condition. Thermocycling had no significant effect on the & micro;-SBS of BK. In the self-etching adhesive group, mixed failure was predominant for all materials. However, in no-adhesive group, adhesive failure and mixed failure were observed at similar levels for all materials. Conclusion: The self-adhesive resin without adhesive showed lower bonding strength in both enamel and dentin compared to the one with adhesive. Clinical relevance: Although there were no significant differences in bond strength stability between materials, SAG still offers a simplified bonding process without compromising bond strength, making it a viable option for clinical use.

Clinical performance of direct composite resin for anterior space closure: A retrospective evaluation

Sun, 01 Mar 2026 00:00:00 GMT

Title: Clinical performance of direct composite resin for anterior space closure: A retrospective evaluation Authors: Kim, Yunhee; Kang, Young-Sin; Jeon, Mi-Jeong; Shin, Yooseok; Shin, Su-Jung; Park, Jeong-Won; 강영신 Abstract: Objective: To evaluate the clinical performance, survival, and complication patterns of direct composite resin for anterior space closure, addressing a lack of long-term data on this conservative esthetic treatment. Materials and Methods: The retrospective study was conducted at a university dental hospital (Gangnam Severance) and analyzed 147 restorations in 53 patients. The mean period of follow-up was 7.05 years, ranging from 2 up to 17 years. Results: Kaplan-Meier analysis showed a 96 % cumulative survival rate with failure (n = 6). The most prevalent findings were repairable complications such as marginal discoloration and deterioration of esthetic form, which occurred more frequently over longer follow-up periods, indicating progressive degradation. Conclusions: Direct composite resin restorations for anterior space closure can demonstrate high clinical durability over an extended period. While this minimally invasive approach provides predictable esthetic and functional outcomes, clinicians should be aware of progressive clinical deterioration, particularly regarding marginal discoloration, which underscores the necessity for periodic maintenance. Clinical Significance: This retrospective evaluation indicates that direct composite resin is a viable, minimally invasive option for anterior space closure. Its acceptable survival rate and repairable complication profile suggest it is a practical alternative to more invasive procedures, although the findings highlight the importance of regular clinical monitoring to manage long-term esthetic degradation.

Immunohistological Characterization of Minced Dental Pulp Transplant in an Ectopic Mouse Model

Sun, 01 Mar 2026 00:00:00 GMT

Title: Immunohistological Characterization of Minced Dental Pulp Transplant in an Ectopic Mouse Model Authors: Lee, Chaehwan; Miyamoto, Yuka; Chen, Wei; Kim, Euiseong; Chang, Insoon; Kang, Mo K. Abstract: Introduction: Dental pulp stem cells have been explored as a potential source for dentin-pulp complex regeneration because of their pluripotency and differentiation capacity. However, cell-based approaches require enzymatic digestion and in vitro expansion, which may alter cell properties and hinder clinical translation. This preliminary proof-of-principle study examines a tissue-based alternative using freshly minced pulp (MP) in an ectopic mouse model as a potentially translatable approach for regenerative endodontics. Methods: Human dental pulp tissue was either minced or enzymatically digested, seeded onto collagen type I scaffolds, inserted into root fragments, and implanted subcutaneously into immunocompromised mice. Results: Histology revealed that MP grafting generated well-organized dentin-pulp-like tissue with high cellularity, vascularization, mineralization, and odontoblast-like cells extending processes into dentinal tubules, whereas dental pulp stem cell grafts formed less organized tissue and mineral deposits. MP-derived tissues also exhibited angiogenic potential, forming vessel-like structures containing pericytes and endothelial cells. Conclusions: This preliminary in vivo mouse study suggests the feasibility of MP transplantation and its potential for dentin-pulp complex regeneration, though further studies are needed to assess long-term outcomes and clinical applicability.

Mechanical behavior of tooth-class II restoration complex with various restorative materials using linear and non-linear finite element analysis

Sun, 01 Feb 2026 00:00:00 GMT

Title: Mechanical behavior of tooth-class II restoration complex with various restorative materials using linear and non-linear finite element analysis Authors: Yu, Young-Ho; Jeon, Mi-Jeong; Shin, Su-Jung; Park, Jeong-Won Abstract: This study aimed to investigate the mechanical behavior of the tooth-class II restoration complex restored with composite resin, ceramic, amalgam, and gold using three-dimensional linear and non-linear finite element analyses (FEA). Previous FEA studies generally assumed linear mechanical properties and bonded interfaces between tooth and restorative materials, which differ from clinical reality, particularly for non-bonded restorations such as amalgam and gold. Therefore, in this study, non-linear mechanical properties and non-bonded contact conditions were adopted for different restorative materials. The results showed that the highest enamel and dentin stresses occurred in amalgam restorations, while the lowest were found in ceramic restorations. Amalgam and gold produced higher stress in enamel and dentin compared with composite resin and ceramic. The higher stress observed in amalgam and gold was mainly associated with the non-bonded (frictional) contact condition, because the stresses in these restorations remained below their reported yield strengths under the applied loading conditions. This study provides mechanical insights into the behavior of the tooth-class II restoration complex and offers a possible mechanical interpretation of previously reported clinical observations. These findings should be interpreted within the limitations of the finite element model and do not directly represent clinical outcomes.