The Journal of Indian Prosthodontic Society最新文献

Aim: To evaluate and compare the viability, proliferation, and adhesion of HGFs on glazed and polished surfaces of 3 mol% yttria-stabilized tetragonal zirconia (3Y-TZP) and 5 mol% yttria-stabilized partially stabilized zirconia (5Y-PSZ).

Settings and design: This in vitro experimental study was conducted to evaluate the viability, proliferation, and adhesion of HGFs on zirconia discs with different compositions (3Y-TZP and 5Y-PSZ) and surface treatments (glazed and polished). The study employed a comparative design with four groups based on the combination of material type and surface finish.

Materials and methods: Sixty-four zirconia discs (n = 16/group) were prepared in four groups: 3Y-TZP glazed, 3Y-TZP polished, 5Y-PSZ glazed, and 5Y-PSZ polished. HGFs were cultured on each specimen. Cell viability was assessed using MTT assay at 24 h and 7 days. Cell morphology and adhesion were analyzed using the scanning electron microscope (SEM).

Statistical analysis used: Statistical analysis was performed using the two-way analysis of variance (ANOVA) and Tukey's post hoc test.

Results: All groups showed >70% cell viability at both time points, indicating noncytotoxicity. Polished zirconia surfaces exhibited significantly higher cell viability than glazed surfaces at 7 days (P < 0.05), with 5Y-PSZ polished showing the highest viability (95.4%). SEM revealed better fibroblast spreading and filopodia formation on polished surfaces. Two-way ANOVA indicated significant effects of material type and surface finish on cell viability (P < 0.05).

Conclusion: Polished zirconia surfaces, irrespective of yttria content, enhanced HGF viability and adhesion compared to glazed surfaces. These findings suggest that polishing promotes superior soft-tissue integration and may contribute to the long-term biological success of zirconia restorations.

Aim: The aim of this research was to evaluate and compare the shear bond strength (SBS) of two intraoral porcelain repair systems to various restorative materials with and without thermocycling.

Settings and design: The study employed an in vitro design with a disc-shaped samples (7 mm × 3 mm) bonded to repair systems, including thermocycling and SBS test with a universal testing machine.

Materials and methods: Two hundred polyetheretherketone (PEEK), cobalt-chromium, zirconia, titanium, and glass ceramic samples were prepared with the computer-aided design/computer-aided manufacture system according to the ISO 6872:2024 (n = 40). After all samples were polished with silicon carbide sandpaper, the bonding surface was roughened with 50 µm Al2O3. Then, all materials were divided into two subgroups (n = 20) according to the repair system used: Bredent and Clearfil repair systems. After sample preparation, each group was divided into two subgroups (n = 10) and subjected to different storage conditions, short- and long-term storage (with 5000 thermocycles). SBS tests were performed on all samples, and fracture types were examined.

Statistical analysis used: The data were analyzed using two-way analysis of variance and Tukey's honestly significant difference test. Significance was determined as P < 0.05.

Results: In short-term storage, when Clearfil repair system was evaluated, the lowest SBS values were recorded for glass ceramic (7.88 ± 1.63 MPa), and the highest SBS values were recorded for titanium (14.92 ± 3.65 MPa) (P < 0.05). When Bredent repair system was evaluated in short-term storage, the lowest SBS values were recorded for zirconia (8.33 ± 1.84 MPa), and the highest SBS values were recorded for titanium (15.77 ± 5.79 MPa) (P < 0.05). Long-term storage decreased the bonding between the materials and the repair systems.

Conclusions: The Clearfil system, used on metal, titanium, and zirconia, and the Bredent system used on PEEK, metal, and titanium materials, demonstrated a minimum SBS of 10 MPa in the short term, suggesting their appropriateness for clinical use. Long-term storage decreased the bonding between the materials and the repair systems.

Aim: The purpose of this study was to evaluate the surface properties, optical stability, and Candida albicans adhesion to resins used in the base of conventional, milled, and three-dimensional (3D)-printed dentures after aging by thermocycling.

Settings and design: In vitro study.

Materials and methods: A total of 96 resin samples were manufactured, divided into 3 resin groups (n= 32) (conventional thermally activated, milled and 3D-printed), and subdivided into 4 aging times by thermocycling at temperatures 5 ± 1°C and 55 ± 1°C in 24h, 5.000, 10.000, 20.000 cycles (n = 8), evaluating the adhesion of C. albicans, optical stability, surface roughness, hydrophilicity, and energy surface.

Statistical analysis used: Data were evaluated by two-way ANOVA and Tukey's test for pairwise comparisons (P < .05).

Results: Conventional resin exhibited lower C. albicans colonization, with significant reductions at T1 (1.05±1.38) (P = .003) and T3 (3.67 ±1.86) (P = .023) compared to other resins. The conventional resin had significantly the lowest ΔE00 value at T0 (0.98 ± 0.41) (P < .05). The milled resin had significantly lower roughness value at T0 (0.031 ± 0.00) (P < .05). The conventional resin had significantly higher surface energy values compared to the other resins (P < .05). The conventional resin exhibited a significantly lower water contact angle than the other resins (P < .001).

Conclusion: The conventional thermally activated resin showed less adhesion of C. albicans than the resins manufactured by CAD/CAM. Among CAD/CAM resins, milled resin showed better properties than 3D-printed resin over time.

Aim: To conduct a bibliometric analysis of peer-reviewed literature concerning the platform switching (PS) concept in dental implants, assessing publication trends, influential authors, leading journals, and prevalent research themes.

Settings and design: Bibliometric analysis based on peer-reviewed publications retrieved from major scientific databases.

Materials and methods: A comprehensive literature search was conducted across five electronic databases: PubMed, Scopus, Web of Science, Cochrane, and ScienceDirect, covering publications from 2000 to 2025. Search terms included "platform switching," "dental implants," "marginal bone loss," and "bibliometric analysis." Inclusion criteria comprised peer-reviewed original articles, systematic reviews, meta-analyses, and clinical studies focusing on PS. Bibliometric indicators, including publication counts, citation analysis, authorship patterns, and keyword co-occurrence, were analyzed using bibliometric tools.

Statistical analysis used: Descriptive bibliometric statistics were applied, including publication trends, citation frequencies, and network visualizations for keyword co-occurrence and authorship patterns.

Results: The analysis revealed a substantial increase in PS-related publications after 2005, peaking in 2015. Influential contributors include Lazzara, Porter, and Atieh. The Journal of Periodontology, Clinical Oral Implants Research, and the Journal of Clinical Medicine were identified as leading journals in this domain. Prominent research themes focus on marginal bone preservation, implant-abutment interface design, and the biomechanical implications of PS.

Conclusion: This bibliometric analysis demonstrates a growing scholarly interest in platform switching within implant dentistry. The concentration of research within specific journals and among a limited number of authors highlights the need for broader dissemination and diversification in future investigations.

Aim: To evaluate the hydrophilicity and cellular response of titanium and zirconia following vacuum-assisted ultraviolet (UV) photofunctionalization using the MG-63 cell line.

Setting and design: An in vitro study.

Materials and methods: 12-disc-shaped titanium (Grade 4) and zirconia (10 mm diameter × 1 mm thickness) specimens were fabricated according to ISO 19403-2:2020. Specimens were divided into six groups based on the duration of photofunctionalization: Group 1 (control), Group 2 (15 s), Group 3 (30 s), Group 4 (45 s), Group 5 (60 s), and Group 6 (90 s). Surface wettability was evaluated using goniometer. Cell proliferation was assessed at 24, 48, and 72 h using the methyl thiazolyl diphenyl-tetrazolium bromide assay.

Statistical analysis used: one-way analysis of variance with Tukey's post hoc test.

Results: Titanium specimens showed a reduction in contact angle from 109.74° ± 0.72° in the control group to 92.33° ± 0.52° after 60 s of treatment, while zirconia showed a decrease in contact angle from 74.48° ± 0.53° to 61.27° ± 0.51°. The highest cell proliferation was observed in 60-s titanium group, with mean viabilities of 63.51%, 64.19%, and 70.21% at 24, 48, and 72 h. Zirconia demonstrated increased proliferation of 47.29%, 49.38%, and 62.70% at the same time intervals. Absorbance values at 570 nm for 60-s treatment followed a similar trend, confirming enhanced metabolic activity. Statistical analysis revealed significant differences among groups (P < 0.0001).

Conclusion: Vacuum-assisted UV photofunctionalization effectively enhanced the surface hydrophilicity and promoted cellular proliferation on titanium and zirconium. 60-s treatment duration yielded the most favorable biological outcomes for zirconium, supporting its potential for improving early-stage biointegration in implant applications.

Aims: The aim of the study was to evaluate the effect of TMDs on craniocervical posture by assessing head-shoulder angle asymmetry and craniovertebral angle (CVA).

Settings and design: A cross-sectional study involving individuals with and without clinical signs and symptoms of temporomandibular joint disorders.

Materials and methods: Eighty-two participants were divided into a test group (n = 41) with TMD signs and a control group (n = 41). TMDs were assessed using a structured questionnaire and the Diagnostic Criteria/TMD (2014) criteria. Postural evaluation included photographic analysis of head-shoulder angle asymmetry using GNU Image Manipulation Program software and CVA measurement using a goniometer.

Statistical analysis used: Independent t-tests, Mann-Whitney U-tests, and Spearman's correlation.

Results: FHP was more prevalent among participants with TMD (57.5%), with a mean CVA of 49.37° ± 3.90° compared to controls (25%), which was statistically significant (P < 0.05). The mean asymmetry in head-shoulder angle was 5.62° ± 1.32° in the TMD group and 1.03° ± 0.89° in the control group.

Conclusions: TMDs are associated with increased head-shoulder asymmetry and FHP. These findings highlight the importance of postural assessment in TMD management.

Aims: This in vitro study evaluated how build angle and layer thickness affect the marginal fit of provisional crowns fabricated by digital light processing (DLP) 3D printing, an important consideration for restoration success.

Settings and design: This was an in-vitro study.

Materials and methods: Twenty-four provisional crowns were 3D-printed using a DLP printer and divided into four groups (n = 6 each) based on build angle (150° vs. 180°) and layer height (20 µm vs. 40 µm): Group I - 150°, 20 µm, Group II - 180°, 20 µm, Group III - 150°, 40 µm, and Group IV - 180°, 40 µm. Using a triple-scan protocol, researchers scanned the master die, the internal surface of each crown, and the seated crown.

Statistical analysis used: The Kruskal-Wallis test and Bonferroni post hoc analysis were used.

Results: All groups demonstrated clinically acceptable marginal fit, but the differences were statistically significant (P < 0.05). The best fit was achieved in Group IV (180° build angle and 40 µm layer height) with a marginal gap of 0.05 ± 0.02 µm. The least accurate was Group II (180°, 20 µm), showing a gap of 0.27 ± 0.25 µm.

Conclusions: From the study, it was determined that 3D-printed provisional crowns with higher build angles and larger layer heights, i.e. Group IV: build angle 180° and layer height 40 µm, exhibited improved marginal fit.

Aim: This study aimed to evaluate the antimicrobial efficacy and cytocompatibility of methanolic Phoenix dactylifera seed extract incorporated into three-dimensional (3D)-printed provisional dental resin against Porphyromonas gingivalis, Candida albicans, and Staphylococcusaureus.

Settings and design: This study design involves an in vitro experimental study.

Materials and methods: Methanolic extract of P. dactylifera seed was prepared and incorporated into a 3D-printed provisional dental resin at concentrations of 1.5%, 2.5%, and 5%. Antimicrobial activity was assessed by colony-forming unit (CFU/ml) counts for each microorganism. Cytotoxicity was evaluated using the MTT assay on Vero cells after 48 h. Phytochemical screening was performed to identify the bioactive constituents in the extract.

Statistical analysis used: One-way Analysis of Variance followed by Tukey's post hoc test was performed using IBM SPSS Statistics for Windows, Version 23.0.

Results: Phytochemical analysis revealed reducing sugars, alkaloids, flavonoids, tannins, glycosides, proteins, and resins. Antimicrobial efficacy increased with concentration, with the 5% group showing the most significant reduction in CFU/ml across all tested microorganisms (C. albicans: 0.13; P. gingivalis and S. aureus: P < 0.05). Cytotoxicity was minimal at 5% and 10% (cell viability >92%), while moderate cytotoxicity was observed at 25% (cell viability: 74%).

Conclusion: Incorporation of P. dactylifera seed extract into 3D-printed provisional dental resin enhanced antimicrobial activity against S. aureus, P. gingivalis, and C. albicans in a dose-dependent manner, with the 5% concentration showing the highest efficacy. Lower concentrations (1.5% and 2.5%) provided substantial antimicrobial effects while maintaining high biocompatibility, supporting their potential clinical use.

Retrieval of multiunit abutment laboratory analogs from digitally printed definitive casts is a crucial step in prosthodontic workflows to preserve the integrity of both the cast and the analog. Traditional methods often compromise the cast's structural integrity, necessitating reconstruction for future adjustments. This article introduces a simplified step-by-step technique employing an abutment holder and its corresponding key, ensuring efficient analog retrieval without additional armamentarium. The technique minimizes damage to the analog and cast, facilitating reuse and maintaining workflow efficiency.

The loss of an eye or the presence of a disfigured eye has a profound and far-reaching impact on an individual's psyche. In addition, it significantly affects their social and professional life. Cosmetic rehabilitation using custom-made prosthetic devices provides such individuals with social and professional acceptance, alleviating associated challenges. This communication describes a technique of incorporating a magnet in an ocular prosthesis to make its removal easy. This is especially useful in patients exhibiting deep fornices and severe undercuts. Deep tissue undercuts make it difficult for the patient to remove the prosthesis. The magnet is covered with a layer of acrylic to ensure it does not cause any harmful effects on the adjacent tissues. The prostheses were reported to be comfortable, unobtrusive, and esthetically pleasing, while the incorporation of magnets enhanced their ease of removal.