Introduction: The regenerative performance of a bone graft substitute is governed by its matrix architecture and elemental composition, yet direct ultrastructural comparisons between synthetic and allogenic grafts used in periodontal therapy remain limited. Aim: The surface micro-architecture and elemental composition of a bioresorbable synthetic graft matrix and demineralized freeze-dried bone allograft (DFDBA) were comparatively evaluated using scanning electron microscopy (SEM) and energy-dispersive spectroscopy (EDS). Materials and Methods: In this in vitro comparative analytical study, six specimens each of a bioresorbable synthetic graft matrix (Group 1) and DFDBA (Group 2) were examined by field-emission SEM at 500×, 1000× and 1500× magnification, followed by EDS elemental mapping of representative areas. Results: The synthetic matrix exhibited a finely porous, uniform and interconnected architecture at all magnifications, whereas DFDBA showed an irregular, comparatively denser and less interconnected porosity that became more compact at higher magnification. EDS revealed inverse elemental profiles: the synthetic matrix was mineral-dominant while DFDBA was organic-dominant. Conclusion: The bioresorbable synthetic graft matrix demonstrates a more uniform, interconnected and mineral-rich scaffold favourable for osteoconduction and mechanical space maintenance, while DFDBA offers a collagen-dominant, osteoinductive matrix of comparatively lower porosity. The two materials appear structurally and compositionally complementary, and graft selection should be individualised to the regenerative requirements of the defect.
INTRODUCTION:Single posterior tooth loss impairs masticatory function, dietary choices, and quality of life. This prospective clinical study compared masticatory efficiency and functional adaptation between single-piece implant-supported crowns and conventional tooth-supported fixed partial dentures (FPDs) over a 12-month period. MATERIALS AND METHODS:Sixty partially edentulous patients (aged 25-60 years) requiring single posterior tooth replacement were consecutively allocated into two equal groups (n = 30 each). Group 1 received single-piece titanium implants with cemented monolithic zirconia crowns after three-month osseointegration. Group 2 received conventional three-unit metal-ceramic FPDs. Masticatory efficiency was assessed at three-, six-, and 12-month post-loading using a standardized almond comminution test. The chewed particles were dried and sieved, and the masticatory performance (MP%) was calculated. Data were analyzed using independent-sample t-tests for intergroup comparisons and repeated-measures analysis of variance (ANOVA) with Bonferroni post-hoc tests for intragroup changes (p < 0.05). RESULTS:All 60 patients completed the study with comparable baseline characteristics. The implant group showed significantly higher MP than the FPD group at all time points: 28.4 ± 4.2% vs. 22.6 ± 3.8% at three months (p = 0.001), 32.1 ± 3.7% vs. 25.4 ± 3.9% at six months (p = 0.001), and 35.7 ± 3.9% vs. 28.3 ± 4.1% at 12 months (p = 0.001). Both groups improved significantly over time, with Bonferroni tests confirming significant gains between all the intervals in each group. The implant group showed greater improvement throughout the follow-up period. CONCLUSION:Single-piece implant-supported crowns provided superior masticatory efficiency and faster functional adaptation than conventional FPDs for single posterior tooth replacement.
Sutures serve as nidus for bacterial colonization in oral wounds, increasing surgical site infection risk amid saliva's 7.5×10⁸ microbial load/mL. Thus, the aim of our study was to compare healing efficacy of i-PRF-coated bioactive sutures versus triclosan-coated polyglactin sutures in periodontal flap surgery in total of 60 sites (30/group) in 10 chronic periodontitis patients requiring flap surgery post-Phase I therapy. Where, group A received conventional sutures coated with injectable platelet-rich fibrin (i-PRF: 700 rpm, 4 min); Group B received Ethicon Vicryl® Plus using Landry Healing Index for assessing wound healing on day 7 post-suture removal, alongside plaque/gingival/bleeding indices. We have found that, both groups showed satisfactory healing without infections: bioactive sutures (3.87±0.68) vs triclosan-coated (4.10±0.76), p=0.215. Pre-surgical indices were 1.20±0.63 (PI), 1.10±0.32 (GI), 1.10±0.74 (BI). We have come to conclude that, i-PRF-coated sutures demonstrated comparable healing to triclosan-coated sutures, suggesting antibacterial coatings may not significantly enhance periodontal wound healing capacity.
Background: Acrylic resin denture base as materials for dentures, do not mimic the gingival esthetics. Gingival composite resin used for fabrication of denture; it enhances the denture esthetics but affects the material's flexural strength. The study aimed to investigate the flexural strength of denture base polymer resin material CAD/CAM milling and injection molding, as well as the impact of gingival shade composite resin thickness. Methods: Two types of denture acrylic resins were used as base materials: CAD/CAM pre-polymerized PMMA resin and injection molded acrylic resin. Specimens of both groups, each size 32×10×3 mm, were fabricated. The denture base material was layered with a Gingiva-shade composite resin in thicknesses of 1.0 mm and 1.5 mm, creating subgroups for each material type (n=10). After conditioning of samples, a UTM was used to conduct a 3-point bending test measured the flexural strength and results were analyzed statistically Results: The compression strengths of the injection-molded acrylic resin samples varied between 125.4±3.115 MPa and 114.3±5.074 MPa, whereas the compression strengths of the CAD-CAM prepolymerized acrylic resin varied between 129.4±3.84 MPa and 119.4±8.16 MPa. All test groups maintained flexural strength values above the ISO 20795-1 minimum requirement of 65 MPa, clinical acceptability for denture fabrication. Conclusions: CAD/CAM PMMA denture bases exhibited superior flexural compared to injection-molded, both pre and post aging and in different thickness of GSCR layering.
Aims and background: Comparative evaluation of cuspal deflection in class II mesio-occluso-distal (MOD) cavities restored with either standard resin composite or resin composite that has been reinforced with polyethylene fibers. Materials and methods: A total of 20 permanent maxillary premolar teeth were collected, cleaned, and mounted in acrylic resin exposing only the crown portion. Prerestorative composite resin beads were placed over buccal and palatal cusp tips and bucco-palatal width (BPW) was determined using digital micrometer gauge. Standardized MOD cavities were prepared for each tooth. The cavities were etched with 37% phosphoric acid, bonding agent application done, increment of composite resin was placed on the pulpal floor of tooth. Mounted specimens were split into two groups at random (n = 10) depending on the materials used for restoration. Group A: restored with composite resin, group B: restored with polyethylene fibers + composite. All the restorations were finished and polished. The cuspal deflection or the BPW was measured after 6- and 12-hours post-restoration. The obtained data were statistically analyzed using paired sample t-test using SPSS software V.21. Results: The highest mean cuspal deflection was noticed in group A (restoration with composite resin), compared with group B (restoration with polyethylene fibers + composite). Although the reinforcement of composite restoration with polyethylene fibers showed decrease in cuspal deflection in comparison to composite restorations alone, statistically insignificant difference among both groups was observed at (p > 0.05). Clinical significance: The addition of polyethylene fibers has the potential to improve clinical performance in resin-based restorative material.
