Journal of Prosthodontics-Implant Esthetic and Reconstructive Dentistry最新文献

Purpose: The purpose of this study was to analyze gingival fibroblast proliferation on additively manufactured polymethylmethacrylate (PMMA) groups with different surface characteristics namely no treatment group (NTG) and customized 250 µm diameter porosity (AM-250G) group.

Materials and methods: 3D-printed NTG was compared for its influence on growth of cells to a additively manufactured surface with porosity (AM-250G). For each group (NTG, AM-250G) 20 samples of material were tested. Fibroblast cells, at a concentration of 2.5 × 10⁴ cells/mL, were seeded into 48 plates separately into two groups (NTG, AM-250G). These were cultured in Dulbecco's Modified Eagle's Medium (DMEM) supplemented with 10% fetal bovine serum (FBS) at 37°C and 5% CO2 atmosphere. For cell proliferation MTT assay was conducted at 24, 48, and 72 h. Cell proliferation was quantified through optical density (OD) measurements of the cell supernatant, and surface analysis was conducted using a scanning electron microscope (SEM). Data normality was confirmed by the Shapiro-Wilk test, with a significance level set at p < 0.05. Statistical analysis was conducted using an independent Student's t-test at each time point.

Results: A significant difference in cell proliferation was observed at 24 h, with the NTG group showing higher cell numbers compared to AM-250G group. Qualitative analysis of cell culture was performed using scanning electron microscopy to compare to the NTG and the porosity (AM-250G) groups after 24, 48, and 72 h of fibroblast tissue attachment. No significant differences were observed between the groups at the 48 and 72-h intervals.

Conclusions: At 24 h, the NTG surface demonstrated superior cell proliferation compared to the surface with porosity (AM-250G). However, significant differences in cell growth on both materials at 48 and 72 h, suggesting that both surface types eventually support similar levels of cell proliferation, with an increase of extensive spread and elongation of fibroblasts cells proliferation on the surface with porosity.

Purpose: This study aimed to evaluate and compare the fracture resistance of long-span fixed provisional restorations fabricated using milling, three-dimensional (3D) printing, and conventional methods.

Materials and methods: Sixty specimens were prepared, divided into four groups of 15 each, corresponding to four fabrication methods: computer-aided design and computer-aided manufacturing (CAD-CAM) milled provisional resins, 3D-printed provisional resins, 3D-printed permanent resins, and conventional bis-acryl restorations reinforced with wire. The specimens underwent a three-point bending test using a universal testing machine to measure fracture resistance, quantified as maximum force (in Newtons). Statistical analysis was performed using one-way ANOVA and Tukey's HSD post-hoc tests to compare the fracture resistance across the four groups.

Results: Significant differences in fracture resistance were observed among the materials tested (p < 0.001). Both the CAD-CAM milled and 3D-printed resins exhibited significantly higher fracture resistance than the conventional bis-acryl method.

Conclusion: The results highlight the mechanical advantages of digital fabrication methods for long-span provisional applications in prosthodontics. These techniques may provide improved durability and reliability, addressing the mechanical demands of complex restorations.

Purpose: To evaluate the shear bond strength (SBS) of stereolithography (SLA), digital light processing (DLP) manufactured, and computer numerical control (CNC) milled zirconia to veneering ceramic.

Materials and methods: Rectangular shaped zirconia substrates (10 × 5 × 5 mm³) were manufactured through SLA, DLP, and CNC technology separately. Their surface roughness was measured and the surface topography was analyzed by atomic force microscope (AFM). Then the veneering ceramic (5 × 5 × 5 mm³) was applied to carry out the SBS test. Failure modes were examined by a scanning electron microscope (SEM). The data of SBS and roughness were statistically analyzed with one-way ANOVA followed by S-N-K post hoc comparisons (a = 0.05).

Results: The surface roughness of the SLA group (0.38 ± 0.03 µm) and the DLP group (0.37 ± 0.04 µm) were both significantly higher than the CNC group (0.16 ± 0.00 µm) (p < 0.001). AFM results revealed irregular surface of SLA and DLP zirconia. No significant difference was found in SBS value of the three groups (p = 0.253). SEM image showed different failure modes including cohesive, adhesive, and mixed failure.

Conclusion: The bonding ability of SLA and DLP zirconia to veneering ceramic were comparable with that of CNC zirconia.

Purpose: Screw-retained implant crowns are a common solution to rehabilitate single or multiple edentulous sites. Angulated screw channel (ASC) abutments have been developed as a new system of connection to correct the angulation of the implant and avoid a possible undesired emergence of the access hole. The purpose of this systematic review was to examine available literature related to the effects of ASC abutments in rehabilitating single implant crowns.

Methods: A protocol was registered in the PROSPERO database (ID = CRD42022295521). An electronic search of the Cochrane Central Register of Controlled Trials and Trial Protocols, MEDLINE, SCOPUS, and Web of Science was performed up to January 16, 2024. Additionally, a manual search was carried out. The meta-analysis used a fixed or a random effects model, based on the heterogeneity between the studies, focusing on binary and continuous data. A risk of bias assessment was performed (NOS or MOGA et al.) The outcomes assessed were peri-implant marginal bone level, probing pocket depth (PPD), the prevalence of technical and mechanical complications, implant and prosthesis survival rates, and esthetics. Statistical significance was set at p < 0.05.

Results: The searches resulted in a total of 10 studies included in the meta-analysis. The mean implant and prosthesis survival rates were respectively 99% (absolute quantity = 243) and 100% (absolute quantity = 239) with non-statistically significant differences observed in single crowns supported by ASC abutments compared to cemented restorations, in terms of marginal bone loss (MBL) (p = 0.22), PPD (p = 0.08), risk of complications (p = 0.53), and esthetics (p = 0.47). Follow-up intervals ranged from 14 days to more than 3 years.

Conclusions: Data based on this systematic review suggest that the clinical and radiographic outcomes of single implants restored using ASC are promising if compared to the outcomes relating to screw-retained single crowns.

Purpose: Feeding plates for cleft palate patients have been used by clinicians for many years to temporarily close the oro-nasal communication until definitive treatment with surgical techniques. The current in vitro study aimed to evaluate the adaptation of the feeding plates manufactured by two different techniques for three cleft types.

Materials and methods: Feeding plates were manufactured with conventional compression molding (CM) and 3-dimensional (3D) additive manufacturing on main models representing bilateral cleft, unilateral right, and unilateral left cleft types (n = 10). The 3D volumetric space between the feeding plate and the corresponding main model was measured by micro-CT to evaluate the adaptation. The adaptation of the plates was assessed based on three different measurement regions: anterior, left, and right. Repeated measure analysis of variance (ANOVA), three factorial ANOVA, and post hoc Bonferroni tests were used as statistical analysis (α = 0.05).

Results: CM groups showed higher volumetric space measurements between the base and master model than 3D groups regardless of measurement region and cleft type, which refers to misfit (p ˂ 0.05). Cleft type differed in the adaptation of 3D groups yet not in CM groups (p ˂ 0.05). The volumetric space evaluation for the right measurement region resulted in higher values regardless of manufacturing method and cleft type (p ˂ 0.05).

Conclusion: Considering that 3D-printed feeding plates showed better adaptation compared to conventionally manufactured plates for all cleft types, 3D printing can be suggested as the manufacturing method of choice for feeding plates.

Obstructive sleep apnea (OSA) is a common and complex medical sleep condition in adults that is associated with chronic medical and mental health conditions. Left undiagnosed and untreated it can decrease quality of life and increase morbidity and mortality. Dentists are at the forefront for screening OSA in their role to maintain the health of the oral cavity. Clinical experience in the management of OSA in dentists is limited. The aim of this article is to provide dentists with foundational knowledge about OSA to empower them to play an active role in the care management of screening and treating OSA.

Purpose: Ultra-high translucency zirconia (UT-Zr) is known for its high esthetic quality; however, its inert surface results in low hydrophilicity and surface energy (SE). To address this limitation, this study proposes an innovative zirconia heat treatment process (ZHTP) and aims to evaluate the effects of ZHTP on the surface characteristics of UT-Zr, offering a novel and practical approach for surface pretreatment in dental practice.

Material and methods: The plate-shaped UT-Zr samples were fabricated. After sintering, the samples without additional staining or polishing were divided into the following nine groups: NT (no additional pretreatment), AB (airborne-particle abrasion), PL (nonthermal plasma), PO (polishing), HPO (fine-polishing), NTH (treat with ZHTP), POPL (PL followed by PO), POH (ZHTP followed by PO), and HPOH (ZHTP followed by HPO). The surface roughness (Ra), microstructure, transmittance, glossiness, wettability, and SE of the samples (n = 10), and statistical analyses were conducted.

Results: AB showed the highest Ra and lowest glossiness (P < 0.05), while HPO and HPOH yielded the smoothest surfaces, with HPOH achieving the highest glossiness (P < 0.05). Although the ZHTP approach slightly improved transmittance, it did not affect the microstructure. PO reduced hydrophilicity and SE (P < 0.05), and HPO slightly increased them. PL significantly enhanced both properties (P < 0.05), and ZHTP also increased them (P < 0.05) to levels similar to PL. Notably, hydrophilicity in nonthermal plasma and ZHTP-treated samples decreased similarly after 24 h.

Conclusions: The ZHTP approach enhances UT-Zr wettability and SE, with slight transmittance improvement. HPOH achieves hydrophilicity and SE comparable to PL, validating ZHTP as a promising strategy for UT-Zr surface optimization in dental applications.

Purpose: This pilot study aimed to compare the flexural strength of Amber Mill CAD to IPS e.max CAD and to determine the impact of different crystallization protocols on the flexural strength of Amber Mill CAD ceramics.

Materials and methods: Amber Mill CAD ceramic blocks of a known Vita Classic shade were selected for testing against control IPS e.max CAD blocks of the same shade. Four different translucencies were selected for Amber Mill CAD blocks: high translucency (HT), medium translucency (MT), low translucency (LT), and medium opacity (MO). Two different translucencies were selected for IPS e.max CAD blocks: HT and LT. The partially crystallized blocks were sectioned and placed into six groups for each temperature protocol for a total of 36 samples for Amber Mill CAD and 18 samples for IPS e.max CAD. The samples were sectioned at a thickness of 1.5 mm to simulate the material thickness recommended by the manufacturer for posterior lithium disilicate (LD) crowns. Four crystallization protocols, as recommended by the manufacturer, were used with Amber Mill CAD blocks, and one crystallization protocol was used with IPS e.max CAD blocks. The samples from each group were subjected to 3-point bending test. A two-way analysis of variance (ANOVA) and Tukey pairwise comparison tests were used for statistical analysis and interpretation of collected data.

Results: The mean averages of maximum flexural strength for Amber Mill CAD samples were 269.54 MPa, 280.10 MPa, 277.55 MPa, and 254.16 MPa for HT, MT, LT, and MO, respectively. The mean averages of maximum flexural strength for the IPS e.max CAD samples were 302.99 MPa and 283.49 MPa for HT and LT, respectively. No significant differences in the mean average flexural strength were found between the Amber Mill CAD and IPS e.max CAD blocks (p > 0.05). Further, there were no statistical differences in flexural strength between the four crystallization protocols of Amber Mill CAD (p > 0.05).

Conclusion: Amber Mill CAD shows similar flexural strength to IPS e.max CAD. Further, altering crystallization protocols of the same shade to obtain different translucencies did not affect the flexural strength of Amber Mill CAD.