Journal of Prosthetic Dentistry最新文献

{"title":"Distortion of printed resin surgical guides after autoclave sterilization and chemical disinfection.","authors":"Natasha Gandarilla, Jennifer V Sabol, Patricia Walworth, Steven E Handel","doi":"10.1016/j.prosdent.2025.02.052","DOIUrl":"https://doi.org/10.1016/j.prosdent.2025.02.052","url":null,"abstract":"<p><strong>Statement of problem: </strong>Advances in implant planning have increased the use of printed surgical guides for precise implant placement. Accurate placement of implants relies on the stability of the surgical guide, therefore the effects of sterilization and disinfection on the dimensional accuracy of surgical guides require evaluation.</p><p><strong>Purpose: </strong>The purpose of this in vitro study was to examine the level of distortion of printed surgical guides after steam sterilization and disinfection by immersion in 70% isopropyl alcohol to develop a protocol for the sterilization of surgical guides.</p><p><strong>Material and methods: </strong>A surgical guide was designed in Blue Sky Bio. Forty guides were printed with Formlabs Form 3B+ printer and Formlabs surgical guide resin following manufacturer's instructions. Each guide was scanned with Primescan optical scanner before disinfection and sterilization. Twenty guides were individually packaged, and autoclave sterilized following manufacturer's recommendation of 134 °C for 20 minutes. The remaining 20 guides were soaked in 70% isopropyl alcohol for 15 minutes. After sterilization and disinfection, the guides were scanned and standard tessellation language (STL) files from pre- and post-sterilization were compared by using the GeoMagic Control X software program to examine dimensional changes. Differences among the study groups were analyzed with a 1-sample t test to determine if the mean site's value for each treatment group was statistically significant from zero and a 2-way repeat-measures ANOVA was used to detect differences among groups (α=.05).</p><p><strong>Results: </strong>The average deviation at the lingual, incisal, and buccal sites of the sterilized guides was 6.3 µm, -2.3 µm, and -20.6 µm, respectively. The average deviation at the lingual, incisal, and buccal sites of the chemically disinfected guides was -0.4 µm, 2.6 µm, and -0.8 µm, respectively. Sterilization showed a statistically significant value at the lingual and buccal surface (P<.05), while the chemical disinfection group did not show a statistically significant difference at any site (P>.05). The 2-way repeat-measures ANOVA test demonstrated there was a significant effect of treatment on the overall mean values (P<.001), with sterilization treatment giving an overall value 6.3 µm more negative than disinfection. There was also a significant effect of site (P<.001), and a significant interaction between treatment and site (P<.001).</p><p><strong>Conclusions: </strong>Heat sterilization caused a significantly greater negative deviation than disinfection across the sites. A statistically significant distortion was found after sterilization, but not with chemical disinfection. However, the amount of distortion will likely not cause a clinically significant effect on the deviation of implant placement.</p>","PeriodicalId":16866,"journal":{"name":"Journal of Prosthetic Dentistry","volume":" ","pages":""},"PeriodicalIF":4.3,"publicationDate":"2025-03-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143670224","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Comparison of vertical marginal gap and internal fit of chairside laminate veneers fabricated from advanced versus conventional lithium disilicate ceramics: An in vitro study.","authors":"Reham Said Elbasty, Omnia Nabil, Mai Salah Elgohary, Maha Taymour","doi":"10.1016/j.prosdent.2025.02.044","DOIUrl":"https://doi.org/10.1016/j.prosdent.2025.02.044","url":null,"abstract":"<p><strong>Statement of problem: </strong>Conventional lithium disilicate material is frequently the material of choice whenever laminate veneers are advocated. Advanced lithium disilicate (CEREC Tessera) has been introduced and is thought to be a favorable alternative to conventional lithium disilicates in terms of reduced chairside time. However, its reliability as a material for laminate veneer fabrication has not been adequately assessed.</p><p><strong>Purpose: </strong>The purpose of this in vitro study was to assess the vertical marginal gap and internal fit of laminate veneers fabricated from the advanced lithium disilicate ceramic versus the conventional lithium disilicate ceramic.</p><p><strong>Material and methods: </strong>A total of 22 laminate veneers were fabricated for a maxillary central incisor and divided into 2 groups; Group E (e.max CAD): fabricated from conventional lithium disilicate and Group T (Tessera):fabricated from advanced lithium disilicate. A typodont maxillary right central incisor was prepared by following the recommended parameters, and the laminate veneers were then scanned, designed, and milled. Quantitative measurements of the vertical marginal gap and internal fit of the laminate veneers on the typodont tooth were made by direct viewing and the silicone replica approach, respectively, using a digital microscope. The Student t test was performed for statistical analysis of the results (α=.05).</p><p><strong>Results: </strong>The mean values of both groups varied significantly. Group T had a lower mean vertical marginal gap (40.5 µm) than group E (52.6 µm) (P<.05). In terms of internal fit, group T had a higher value (191.5 µm) than group E (142.4 µm) (P<.05).</p><p><strong>Conclusions: </strong>Advanced lithium disilicate laminate veneers revealed better vertical marginal gap and lower internal fit than conventional lithium disilicate laminate veneers.</p>","PeriodicalId":16866,"journal":{"name":"Journal of Prosthetic Dentistry","volume":" ","pages":""},"PeriodicalIF":4.3,"publicationDate":"2025-03-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143663759","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Effects of DLP printing orientation and postprocessing regimes on the properties of 3D printed denture bases.","authors":"Dana Jafarpour, Nesma El-Amier, Kawkab Tahboub, Elizabeth Zimmermann, Ana Carolina Pero, Raphael de Souza","doi":"10.1016/j.prosdent.2025.02.035","DOIUrl":"https://doi.org/10.1016/j.prosdent.2025.02.035","url":null,"abstract":"<p><strong>Statement of problem: </strong>The variety of recommended postprocessing techniques and printing parameters makes it challenging to determine the best approach to 3-dimensionally (3D) printed dentures.</p><p><strong>Purpose: </strong>The purpose of this in vitro study was to assess the effect of printing orientations (0, 45, and 90 degrees) and postprocessing treatments (ultraviolet [UV], heat, or combination) on the mechanical and surface properties of 3D printed denture base resin.</p><p><strong>Material and methods: </strong>Three-dimensionally printed denture base resin specimens were fabricated at 0-, 45-, and 90-degree printing orientations, followed by 4 postprocessing techniques (UV, Heat, UV+Heat, and control). Microhardness was assessed using a Vickers microhardness tester. Additionally, the flexural strength (FS) and modulus of elasticity (MoE) were analyzed using a 3-point bend test. Wettability was measured according to the sessile drop test. The fractured surfaces were observed under scanning electron microscopy (SEM).</p><p><strong>Results: </strong>FS was significantly greater (P<.001) at a print orientation of 90 degrees (73.7 MPa) compared with 0 and 45 degrees (55.2 and 61.8 MPa). No significant difference in FS was found among postprocessing treatments (all complied with the International Organization for Standardization [ISO] requirements). The UV group had the highest MoE (up to 2061 MPa), followed by the heat-treated groups (up to 1412 MPa). The 45-degree print orientation showed the highest contact angle (CA) in almost all groups (CA=117.6±11.7), and UV led to higher hydrophilicity (CA=33.9±12.0). The effect of build orientation on the microhardness depended on the postprocessing technique with the highest value (23.4 ±1.3) achieved by UV postprocessing in combination with the 90-degree orientation.</p><p><strong>Conclusions: </strong>The optimal FS of 3D printed denture base resin is achieved when it is printed in a vertical orientation (90 degrees relative to the platform base). Thermal annealing as a postprocessing technique combined with UV can effectively enhance FS, induce favorable wettability, and reduce stiffness.</p>","PeriodicalId":16866,"journal":{"name":"Journal of Prosthetic Dentistry","volume":" ","pages":""},"PeriodicalIF":4.3,"publicationDate":"2025-03-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143663811","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Evaluation of the effects of the small intestine submucosa biological membrane on guided bone regeneration and early loading of dental implants in the maxillary anterior region: A randomized controlled trial.","authors":"Chao Liang, Yao Wang, Jun Li, Wei Geng","doi":"10.1016/j.prosdent.2025.02.030","DOIUrl":"https://doi.org/10.1016/j.prosdent.2025.02.030","url":null,"abstract":"<p><strong>Statement of problem: </strong>Whether an early loading strategy can be applied to a single maxillary anterior implant with insufficient bone volume is debatable. Moreover, the clinical effect of using a small intestine submucosa (SIS) biological membrane in guided bone regeneration (GBR) surgery in such clinical scenarios is unclear.</p><p><strong>Purpose: </strong>The purpose of this randomized controlled trial was to determine the effectiveness and safety of an early loading strategy for patients who have undergone dental implant placement and GBR surgery for a missing maxillary anterior tooth and to clarify the effects of SIS membranes.</p><p><strong>Material and methods: </strong>Thirty-six study participants were randomly assigned into 3 groups: the GBR with a resorbable non-crosslinked porcine collagen membrane (Bio-Gide) and delayed implant loading (Gide-DL) group, the GBR with a resorbable non-crosslinked porcine collagen membrane (Bio-Gide) and early implant loading (Gide-EL) group, and the GBR with an SIS membrane and early implant loading (SIS-EL) group. The degree of implant torque was ≥35 Ncm. Definitive restorations were completed 6 months after surgery in the Gide-DL group and 6 weeks after surgery in the Gide-EL and SIS-EL groups. Clinical examination, intraoral scanning, radiograph examination, and white and pink esthetic scoring was performed at the 1-year follow-up to evaluate the implant survival rate, peri-implant conditions, soft tissue contour changes, marginal bone resorption, and esthetics. Data with a normal distribution and homogeneous variance were analyzed via 1-way analysis of variance (ANOVA) and the least significant difference (LSD) multiple comparison test. Data without a normal distribution or homogeneous variance were analyzed via the Kruskal-Wallis H test and Bonferroni multiple comparison test (α=.05 for all tests).</p><p><strong>Results: </strong>No implant failures or significant differences in the probing depth, plaque index, or bleeding index among the 3 groups were detected at the 1-year follow-up. There was no significant difference in the soft tissue contour change among the 3 groups. Only the changes at 1 mm apical to the crown-gingival connecting margin in the SIS-EL group were significantly lower than those in the Gide-EL and Gide-DL groups (P<.05). The marginal bone levels and white and pink esthetic scores were not significantly different among the 3 groups (P>.05).</p><p><strong>Conclusions: </strong>The early loading strategy is suitable for patients who have undergone dental implant placement and GBR for a missing maxillary anterior tooth with good primary stability, and favorable clinical effects can be achieved with the use of SIS membranes.</p>","PeriodicalId":16866,"journal":{"name":"Journal of Prosthetic Dentistry","volume":" ","pages":""},"PeriodicalIF":4.3,"publicationDate":"2025-03-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143663812","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Characterization of the anterior maxillary region for immediate implant placement: A radiographic cross-sectional study.","authors":"Emilio Couso-Queiruga, Ignacio Pedrinaci, Gustavo Avila-Ortiz, Vivianne Chappuis, Eliane Porto Barboza, Rodrigo Lima Petersen, Clemens Raabe, Diogo Moreira Rodrigues","doi":"10.1016/j.prosdent.2025.02.025","DOIUrl":"https://doi.org/10.1016/j.prosdent.2025.02.025","url":null,"abstract":"<p><strong>Statement of problem: </strong>Information regarding the influence of local phenotypical features in the context of immediate implant placement (IIP) in the anterior maxillary region is sparse.</p><p><strong>Purpose: </strong>The purpose of this clinical study was to characterize key phenotypical and anatomical characteristics of the anterior maxilla related to the feasibility of virtual IIP.</p><p><strong>Material and methods: </strong>Cone beam computed tomography (CBCT) scans acquired from adult participants were used for virtual implant placement and to measure periodontal phenotypical dimensions (buccal and palatal gingival (GT) and bone thickness (BT)), the buccal gap (BG) at different apico-coronal levels, and anatomical variables nasopalatine canal and ramifications, nasal cavity, maxillary sinus). The study sample was comprised of 330 maxillary anterior teeth. Two different immediate implant modalities were examined: cingulum emergence plan (CEP) and incisal edge emergence plan (IEP).</p><p><strong>Results: </strong>A total of 660 implants were virtually placed. The mean periodontal phenotypical dimensions showed variability between and within individuals depending on the apico-coronal level, tooth type, and implant placement modality. Immediate implant feasibility was 90.1% and 93.6% for the CEP and IEP groups, respectively, and was influenced by tooth type and anatomical variables. BG distance was generally greater at the coronal aspect and in the CEP. Thick bone and gingiva (≥1 mm) were observed in 15.2% and 89.3% of the sites, respectively. A minimum of 2 mm of apical bone availability to achieve primary stability was observed in 88.8% and 91.2% of the sites in the CEP and IEP groups, respectively.</p><p><strong>Conclusions: </strong>This study highlights the variability in periodontal phenotypical and local anatomical features at anterior maxillary sites. These observations underscore the importance of recognizing such variations that should be identified and considered during the planning and execution of therapy.</p>","PeriodicalId":16866,"journal":{"name":"Journal of Prosthetic Dentistry","volume":" ","pages":""},"PeriodicalIF":4.3,"publicationDate":"2025-03-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143657590","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Dimensional stability and fit of additively manufactured removable dies in dental cast resins with different chemical compositions.","authors":"Fiona Cornelia Arnold, Dr Mustafa Borga Dönmez, Hanan Al-Johani, Çiğdem Kahveci, Martin Schimmel, Burak Yilmaz, Gülce Çakmak","doi":"10.1016/j.prosdent.2025.02.045","DOIUrl":"https://doi.org/10.1016/j.prosdent.2025.02.045","url":null,"abstract":"&lt;p&gt;&lt;strong&gt;Statement of problem: &lt;/strong&gt;Additive manufacturing has enabled the fabrication of removable dies in various resins with different compositions. However, the knowledge on the dimensional stability and fit of removable dies fabricated with different dental cast resins is lacking.&lt;/p&gt;&lt;p&gt;&lt;strong&gt;Purpose: &lt;/strong&gt;The purpose of this in vitro study was to evaluate the effect of dental cast resin type and storage time on the dimensional stability and fit of AM removable dies throughout a 4-week period.&lt;/p&gt;&lt;p&gt;&lt;strong&gt;Material and methods: &lt;/strong&gt;A typodont model with a prepared right first mandibular molar was digitized with an intraoral scanner (IOS) (CEREC Primescan) to generate a standard tessellation language (STL) file. The STL file was imported into a dental design software program to design a removable die with 10-degree shaft taper angle and a hollow partial arch cast with and without the die. The removable die and hollow partial arch cast without the die STLs were used to additively manufacture 48 removable dies (n=16) and 3 hollow casts (n=1) by using a dental cast resin (DentaMODEL) (AM-DM), a bio-based dental cast resin (FotoDent biobased model) (AM-FD), and a nanographene-reinforced dental cast resin (G-Print) (AM-GP). The same IOS was used to digitize each die and when the die was seated into its respective hollow cast 1 day (T0), 1 week (T1), 2 weeks (T2), 3 weeks (T3), and 4 weeks (T4) after fabrication. All STL files were imported into a metrology-grade 3-dimensional analysis software program (Geomagic Control X). The root mean square (RMS) was used to assess deviations in different die regions (crown, root, base of the root, and overall) over 4 weeks, along with fit evaluation by calculating RMS for the crown portion within the cast and measuring mean distance deviations at 5 points on the die. The generalized linear model analysis and Bonferroni-corrected post hoc tests were used to evaluate the data (α=.05).&lt;/p&gt;&lt;p&gt;&lt;strong&gt;Results: &lt;/strong&gt;The dimensional stability of the removable dies was affected by the interaction between resin type and die region and by the interaction between the resin type and time point, while the fit of the dies was impacted by the interaction between resin type and time point (P&lt;.001). AM-GP dies mostly had higher crown RMS than AM-FD dies (P&lt;.001), while AM-DM dies had the highest root and base of the root RMS (P≤.027). AM-FD dies had the lowest overall RMS (P≤.038). The base of the root led to the highest RMS for each resin (P&lt;.001). AM-FD dies had lower RMS than AM-GP at T0 and AM-DM at T2, while AM-GP dies had lower RMS than AM-DM at T1 (P≤.010). The RMS values of AM-GP dies were lower at T1 than at T0 and T3 (P&lt;.001). When the fit of the dies was considered, AM-FD dies had the lowest and AM-DM dies had the highest crown portion RMS and point-based deviations at each time point (P&lt;.001). In addition, AM-DM dies' RMS values and deviations were the lowest at T0, while AM-FD dies had the hi","PeriodicalId":16866,"journal":{"name":"Journal of Prosthetic Dentistry","volume":" ","pages":""},"PeriodicalIF":4.3,"publicationDate":"2025-03-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143657603","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Effect of finish line designs on the dimensional accuracy of monolithic zirconia crowns fabricated with a material jetting technique.","authors":"Jizhe Lyu, Xunning Cao, Xu Yang, Jianguo Tan, Xiaoqiang Liu","doi":"10.1016/j.prosdent.2025.02.055","DOIUrl":"https://doi.org/10.1016/j.prosdent.2025.02.055","url":null,"abstract":"<p><strong>Statement of problem: </strong>Finish line design is critical for the long-term stability of complete crown restorations. However, the optimal finish line design for monolithic crowns fabricated with material jetting (MJ), a type of printed zirconia, remains unknown.</p><p><strong>Purpose: </strong>The purpose of this in vitro study was to evaluate the dimensional accuracy and marginal quality of monolithic zirconia complete crowns with various finish line designs fabricated through subtractive manufacturing (SM) or MJ.</p><p><strong>Material and methods: </strong>A standardized typodont right mandibular first molar was prepared with 5 different finish line designs: knife edge, 0.5-mm chamfer, 0.5-mm shoulder, 0.8-mm chamfer, and 0.8-mm shoulder. Complete crowns were designed with identical occlusal morphology and thickness. In total, 100 monolithic zirconia crowns were fabricated using SM and MJ (n=10 crowns for each finish line design and manufacturing method). Dimensional accuracy in the external, marginal, and intaglio regions was evaluated by using best-fit alignment with the design data. Marginal quality was assessed under a ×20 stereomicroscope. Differences among the test groups were analyzed by using MANOVA and post hoc least significant difference tests for accuracy data, and Scheirer-Ray-Hare test with Dunn post hoc test for margin quality data (α=.05).</p><p><strong>Results: </strong>Significant differences in accuracy were found for the external and marginal regions based on finish line design, and for external accuracy based on the manufacturing method (P<.05). The knife edge, 0.5-mm chamfer, and 0.5-mm shoulder designs demonstrated larger root mean square (RMS) deviations in the marginal region compared with the 0.8-mm chamfer and 0.8 mm-shoulder (P<.05). SM crowns exhibited the lowest external RMS value for the 0.8-mm chamfer (22.3 ±4.2 µm). No significant differences were observed in the intaglio region across the 5 margin designs (P>.05). MJ crowns exhibited lower external deviations and similar margin and intaglio RMS values compared with SM crowns (P>.05). Marginal quality was highest for the 0.8-mm chamfer and shoulder designs, while knife edge designs exhibited the most flaws, regardless of manufacturing method.</p><p><strong>Conclusions: </strong>All 5 margin designs demonstrated reliable accuracy in monolithic zirconia crowns. However, crowns with 0.8-mm chamfer and 0.8-mm shoulder designs exhibited superior accuracy and marginal quality compared with knife edge, 0.5-mm chamfer, and 0.5-mm shoulder designs. MJ technology produced crowns showed higher external accuracy than SM.</p>","PeriodicalId":16866,"journal":{"name":"Journal of Prosthetic Dentistry","volume":" ","pages":""},"PeriodicalIF":4.3,"publicationDate":"2025-03-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143656846","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Deep margin elevation in anterior teeth: A clinical report.","authors":"Elisa D A Grassi, Marco M M Gresnigt","doi":"10.1016/j.prosdent.2025.02.027","DOIUrl":"https://doi.org/10.1016/j.prosdent.2025.02.027","url":null,"abstract":"<p><p>Subgingival fractures in the anterior region present challenges for adhesive ceramic restorations. The deep margin elevation (DME) technique, using composite resin to elevate subgingival margins before indirect restoration preparation, has been reported to improve outcomes while maintaining esthetic and functional integrity. Developed for posterior teeth, DME aligns with minimally invasive principles and leverages adhesive material advancements. Its use in anterior teeth preserves gingival architecture, supports periodontal health, and ensures precise adhesive protocols, essential for successful rehabilitation. This report outlines DME's systematic application for managing anterior subgingival fractures.</p>","PeriodicalId":16866,"journal":{"name":"Journal of Prosthetic Dentistry","volume":" ","pages":""},"PeriodicalIF":4.3,"publicationDate":"2025-03-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143657600","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Comparative chromatic study of the interdental gingival papillae.","authors":"Cristina Gómez Polo, Javier Montero Martín, Norberto Quispe López, Ana María Martín Casado","doi":"10.1016/j.prosdent.2025.02.012","DOIUrl":"https://doi.org/10.1016/j.prosdent.2025.02.012","url":null,"abstract":"<p><strong>Statement of problem: </strong>Data are lacking on interdental papillae color, including the effect of sociodemographic or behavioral factors, and which ceramic gingival specimens best match it.</p><p><strong>Purpose: </strong>The purpose of this clinical study was to determine the color coordinates of healthy gingival papillae and compare them according to sex, age, dental hygiene, and smoking habits, to compare the color coordinates of the papillae to other gingival zones, and to present a valid set of pink ceramic specimens for use in subjective color selection with the gingival papillae.</p><p><strong>Material and methods: </strong>Color coordinates of the attached gingiva and interdental papillae adjacent to the maxillary incisor were recorded by using spectrophotometry (Spectroshade; MHT Optic Research) in 62 White participants (124 papillae). To determine which color specimens best represented the interdental papillae, according to the acceptability thresholds (AT), 2 published databases were used: 15 validated ceramic gingival specimens and 133 ceramic gingival specimens. MANOVA was used for comparisons of color coordinates, and the coverage error was calculated to evaluate the guide.</p><p><strong>Results: </strong>The color-coordinate ranges of the interdental papillae were: L*: 42.2 to 57.5; a*: 16.8 to 30.6; and b*: 11.2 to 18.1. Statistically significant differences were found between all gingival zones for all color coordinates (P<.05). The interdental papillae were less yellow than the middle zone of attached gingiva and the free gingival margin, and redder than the mucogingival line. Using the Euclidean formula, the coverage error of the 15-specimen gingival guide was 2.71.</p><p><strong>Conclusions: </strong>The gingival papillae of women were significantly lighter than of men, and the b* coordinate was higher in the papillae of smokers than non-smokers. Age or dental hygiene did not significantly affect interdental papillae color coordinates. Color differences exceeding the AT between the interdental papillae and each of the 3 attached gingival zones were found in a large part of the population. The 15 specimens were useful for subjective shade selection with the interdental papillae.</p>","PeriodicalId":16866,"journal":{"name":"Journal of Prosthetic Dentistry","volume":" ","pages":""},"PeriodicalIF":4.3,"publicationDate":"2025-03-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143639585","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Accuracy of a complete arch noncalibrated splinting implant scanning technique with a palatal orientation recorded by using different intraoral scanners.","authors":"Marta Revilla-León, Rocio Cascos, Abdul B Barmak, John C Kois, Miguel Gómez-Polo","doi":"10.1016/j.prosdent.2025.02.020","DOIUrl":"https://doi.org/10.1016/j.prosdent.2025.02.020","url":null,"abstract":"&lt;p&gt;&lt;strong&gt;Statement of problem: &lt;/strong&gt;The accuracy of noncalibrated splinting implant scanning techniques that include horizontal implant scan bodies (ISBs) positioned connecting the implants by following the shape of the dental arch have previously been analyzed. A novel horizontal ISB connected in the center of the arch has been introduced; however, the accuracy of this noncalibrated splinting implant scanning technique with a palatal orientation is unknown.&lt;/p&gt;&lt;p&gt;&lt;strong&gt;Purpose: &lt;/strong&gt;The purpose of this in vitro study was to compare the accuracy of a nonsplinting and noncalibrated splinting implant scanning technique recorded using 5 intraoral scanners (IOSs).&lt;/p&gt;&lt;p&gt;&lt;strong&gt;Material and methods: &lt;/strong&gt;A laboratory scan (reference scan) of an edentulous stone cast with 6 implant abutment analogs (MultiUnit Abutment Plus Replica) was acquired (T710). Five groups were created based on the IOS tested: TRIOS5, Primescan, i700, Aoralscan3, and iTero Element 5D. Two subgroups were defined based on the implant scanning technique used to record complete arch implant scans: a nonsplinted (NS-ISB subgroup) or noncalibrated splinting (NCS-IOC group) implant scanning technique (n=10). In the NS-ISB subgroup, an ISB (TrueScan Body) was positioned on each implant abutment, and complete arch implant scans were recorded and exported in standard tessellation language (STL) format. In the NCS-IOC subgroup, a horizontal ISB (IOConnect) was positioned on each implant abutment connecting them in the center of the palate. Implant scans were recorded, capturing only the section of the horizontal ISBs located in the center of the arch. Then, the scans were processed by a specific program (TruSuite), and the STL of the scans were exported. A program (Geomagic) was used to perform linear and angular measurements among the ISBs in the control scan and each specimen. The measurements obtained in the control scan were used as a reference to measure the scanning distortion of each specimen. The 2-way ANOVA Welch and pairwise multiple comparison Tukey tests were used to analyze trueness (α=.05). The Levene and pairwise multiple comparison Wilcoxon rank tests were used to analyze precision (α=.05).&lt;/p&gt;&lt;p&gt;&lt;strong&gt;Results: &lt;/strong&gt;Linear trueness discrepancies were found among the groups (P&lt;.001) and subgroups (P&lt;.001), with a significant interaction group×subgroup (P=.002). The NCS-IOC group had significantly better linear trueness than the NS-ISB group. The TRIOS5, Primescan, and Aoralscan3 systems had significantly better linear trueness than the i700 device. The Levene test revealed that the NCS-IOC group had significantly better linear precision than the NS-ISB group. Additionally, angular trueness discrepancies were revealed among the groups (P&lt;.001) and subgroups (P&lt;.001), with a significant interaction group×subgroup (P&lt;.001). The NCS-IOC group had significantly better angular trueness than the NS-ISB group. The i700 and Aoralscan3 systems had the best angu","PeriodicalId":16866,"journal":{"name":"Journal of Prosthetic Dentistry","volume":" ","pages":""},"PeriodicalIF":4.3,"publicationDate":"2025-03-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143639579","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}