The International journal of prosthodontics最新文献

{"title":"Improving Fracture Resistance of 5Y-PSZ-Based Three-Unit Bridge Prostheses.","authors":"Jae Won Kim, Tung Van Vo, Megha Satpathy, Raj Malyala","doi":"10.11607/ijp.8643","DOIUrl":"10.11607/ijp.8643","url":null,"abstract":"<p><strong>Purpose: </strong>To investigate the effect of BruxZir Steel treatment on the fracture resistance of zirconia threeunit bridges prepared using 5Y-PSZ-based zirconia blanks.</p><p><strong>Materials and methods: </strong>Three-unit zirconia bridges were milled using CAD/CAM from homogeneous bisque zirconia blanks (5Y-PSZ-based) supplied by various manufacturers and sintered. Fracture resistance was analyzed with dynamic loading. For each zirconia blank, the fracture resistance of the sintered test restoration (cementation surface treated with BruxZir Steel) was compared to the sintered control restoration (untreated cementation surface). Finite element analysis (FEA) was used to analyze the stress distribution on the three-unit bridge under an axial load.</p><p><strong>Results: </strong>The fracture resistance of the test restorations was significantly higher than that of the control restorations for all manufacturers considered in this study (P < .05). Furthermore, the restoration made of BruxZir Esthetic treated with BruxZir Steel had the highest fracture resistance compared to the other restorations. In addition, the three-unit bridge restorations prepared from 5Y-PSZ-based zirconia blanks exhibited differences in grain size and fracture toughness depending on the presence or absence of BruxZir Steel treatment. The locations of high stresses under FEA correlated well with the fracture locations in the corresponding experimental test. FEA also demonstrated the improved performance of the BruxZir Steel-treated sample compared to the control.</p><p><strong>Conclusions: </strong>The fracture resistance of 5Y-PSZ-based BruxZir Steel-treated three-unit bridges was significantly higher (min = 30%, max = 198%) than the control.</p>","PeriodicalId":94232,"journal":{"name":"The International journal of prosthodontics","volume":"0 0","pages":"650-658"},"PeriodicalIF":0.0,"publicationDate":"2024-11-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41224448","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Recycling CAD/CAM Lithium Disilicate Ceramic: Effect of Surface Treatment and Aging on the Bond Strength to Resin Cement.","authors":"Larissa Mendonça de Miranda, Aparecida Tharlla Leite Caldas, Dayanne Monielle Duarte Moura, Karina Barbosa Souza, Isauremi Vieira de Assunção, Mutlu Özcan, Rodrigo Othávio de Assunção E Souza","doi":"10.11607/ijp.8677","DOIUrl":"10.11607/ijp.8677","url":null,"abstract":"<p><strong>Purpose: </strong>To investigate the effects of recycling lithium disilicate (LD), surface treatment, and thermocycling on the bond strength to resin cement.</p><p><strong>Materials and methods: </strong>A total of 72 tablets (10 × 10 × 3 mm) of LD were made according to the recycling cycle with 24 tablets for each strategy: control (conventional sintering), 1R (1 recycling cycle), and 3R (3 recycling cycles). For the recycling groups, tablets were waxed, mounted in a silicone ring, and poured with investment material, and residues of sintered LD tablets were pressed by the lost wax technique. The residual LD was reused as described until it reached 3R. Afterward, the tablets were embedded in acrylic resin, sanded, and divided (n = 15) according to the factors of 'surface treatment' (hydrofluoric acid [HF] for 20 seconds [HF20s] and silane, HF for 120 seconds [HF120s] and silane, and Monobond Etch & Prime [MEP]) and thermocycling (TC; with 10,000 cycles and without). After surface treatment, cylinders (diameter: 2 mm) of resin cement were made and submitted to SBS test (100 kgf, 1 mm/minute). Data (MPa) were analyzed by three-way ANOVA, Tukey test (5%), and Weibull analysis. Failure analysis was performed with a stereomicroscope.</p><p><strong>Results: </strong>ANOVA revealed that all factors were significant (P = .000*). The group 3RMEP (105.09 ± 19.49) presented the highest SBS among the experimental groups. The 1RHF20sTc (7.50 ± 1.97) group had the lowest SBS, similar to CHF20sTc (15.69 ± 3.77), 1RHF20s (15.12 ± 3.03), 1RHF120sTc (14.60 ± 3.43), and 3RHF20sTc (15.65 ± 0.97). The Weibull modulus and characteristic strength varied among the experimental groups (P = .0). Failure analysis revealed adhesive and mixed types.</p><p><strong>Conclusions: </strong>The recycling of DL ceramics increases the SBS to resin cement when the ceramic is treated with HF120s and silane or MEP.</p>","PeriodicalId":94232,"journal":{"name":"The International journal of prosthodontics","volume":"0 0","pages":"675-685"},"PeriodicalIF":0.0,"publicationDate":"2024-11-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41224508","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Oral Prosthetic Rehabilitation in Patients with Epidermolysis Bullosa Hereditaria: A Systematic Review.","authors":"Salomé Mascarell, Hélène Citterio, Énora Le Roux, Ariane Berdal, Géraldine Lescaille, Lisa Friedlander","doi":"10.11607/ijp.8791","DOIUrl":"10.11607/ijp.8791","url":null,"abstract":"<p><strong>Purpose: </strong>To review the oral prosthetic rehabilitation of patients with epidermolysis bullosa hereditaria (EBH) and study the level of evidence and quality of the presented available articles and establish clinical recommendations for the prosthetic management of these patients.</p><p><strong>Materials and methods: </strong>An electronic search was done in July 2022 in five databases following PICOTS elements. The quality of the reports was established using the modified Pierson, Bradford Hills, and Ottawa Newcastle scale.</p><p><strong>Results: </strong>Data extracted from 19 case reports for protocolized analysis corresponded to 64 patients and 80 dental prostheses, with almost 9 out of 10 patients being completely edentulous. The distribution of EBH types was 84% dystrophic, 10.5% junctional, and 5.5% simplex. The difficulties encountered by the authors synthesized in this review characteristically reflected those most likely encountered in dental practice. Most rehabilitations were implant-supported prostheses (85%), followed by removable dentures (10%) and dental-supported rehabilitations (5%). Fixed full-arch implant-supported prostheses represented 76.4% of implant-supported prostheses, and this prosthetic solution reflected the highest scientific quality.</p><p><strong>Conclusions: </strong>For an individualized approach to treatment, we recommend that in cases of total edentulism, fixed full-arch implant-supported prostheses are the most appropriate because they allow the best computer-aided planning, design, manufacture, and fitting of the prosthesis in such a complex clinical context.</p>","PeriodicalId":94232,"journal":{"name":"The International journal of prosthodontics","volume":"0 0","pages":"699-710"},"PeriodicalIF":0.0,"publicationDate":"2024-11-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138813873","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Does an Ergonomic Dentist Stool Design Have a Positive Impact on Musculoskeletal Health During Intraoral Scans and Tooth Preparation?","authors":"Ji-Min Lee, Keunbada Son, Jin-Wook Kim, Myoung-Uk Jin, Kyu-Bok Lee","doi":"10.11607/ijp.8672","DOIUrl":"10.11607/ijp.8672","url":null,"abstract":"<p><strong>Purpose: </strong>To evaluate the effects of an ergonomic dentist stool design on muscle activity and fatigue in dentists.</p><p><strong>Materials and methods: </strong>A total of 14 dentists were recruited, and electrodes were attached to the arm, neck, and shoulder muscles of these dentists according to the surface electromyography (EMG) for the noninvasive assessment of muscles protocol. After measuring the maximal voluntary contraction, eightchannel surface EMG was performed during simulations of two dental procedures (intraoral scanning and tooth preparation) while the dentists were using two types of dentist stools. Furthermore, muscle activity and fatigue were determined based on eight-channel surface EMG data, and ergonomic risk levels were evaluated according to the muscle activity. Shapiro-Wilk test was used to confirm that all data were normally distributed, and Mann-Whitney U test was used to compare the two types of dentist stools (α = .05).</p><p><strong>Results: </strong>There was a significant difference between the conventional and ergonomically designed dentist stools in terms of the activity of the trapezius descendens muscle (P < .05). Notably, the activity of the trapezius descendens muscle was less when the dentists used ergonomically designed dentist stools than when they used a conventional dentist stool. The activity of all muscles, except for the sternocleidomastoid, indicated moderate ergonomic risk.</p><p><strong>Conclusions: </strong>A dentist stool that enables dentists to maintain ergonomic posture should be used to prevent musculoskeletal disorders.</p>","PeriodicalId":94232,"journal":{"name":"The International journal of prosthodontics","volume":"0 0","pages":"644-649"},"PeriodicalIF":0.0,"publicationDate":"2024-11-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138292637","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Bacterial Growth on Titanium vs Zirconia Healing Caps: An In Vitro Study.","authors":"Gil Slutzkey, Michael Saminsky, Shifra Levartovsky, Ari Glikman, Shlomo Matalon, Nirit Tagger Green","doi":"10.11607/ijp.8700","DOIUrl":"10.11607/ijp.8700","url":null,"abstract":"<p><strong>Purpose: </strong>To evaluate and compare bacterial growth on zirconia vs titanium healing caps.</p><p><strong>Materials and methods: </strong>Streptococcus sanguinis (Ss) and Ftreptococcus nucleatum (Fn) were grown on titanium and zirconia healing caps that were fixed to the cover of a 96-well microtiter plate. A drop (10 μL) of bacterial suspension was placed on each healing cap and allowed to dry for 1 hour at 37°C. After this time, the cover was replaced on the plate such that the caps were completely immersed in fresh liquid medium. Each plate contained only one bacterial strain, with two control groups. Bacterial growth was monitored over 18 hours by following the optical density (OD) at 650 nm. One-way ANOVA comparison test was used for statistical analysis. Scanning electron microscope (SEM) images of healing caps of each material were taken after 48 hours of incubation with Ss or Fn to assess bacterial attachment and with no bacteria as a negative control.</p><p><strong>Results: </strong>Ss growth was similar in both types of healing cap, with no significant differences between these groups and the control (P = .990). However, there was significantly less growth of Fn on the zirconia caps than on the titanium samples (P < .0001) or the control (P < .0001). SEM imaging revealed obvious differences in the surface characteristics of the titanium and zirconia caps. The number of bacteria attached to the rough apical area was particularly high.</p><p><strong>Conclusions: </strong>The use of zirconia healing caps may reduce the growth of some bacterial species compared to that seen on titanium healing caps.</p>","PeriodicalId":94232,"journal":{"name":"The International journal of prosthodontics","volume":"0 0","pages":"667-674"},"PeriodicalIF":0.0,"publicationDate":"2024-11-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41224430","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"3-Year Bone Remodeling in Mandibular Overdenture Wearers: Results from an RCT Comparing Immediate vs Conventional Loading Using CBCT.","authors":"Alessandra Julie Schuster, Salma Rose Buchnveitz Salybi, Anna Paula da Rosa Possebon, André Ribeiro Schinestsck, Fernanda Faot","doi":"10.11607/ijp.8647","DOIUrl":"10.11607/ijp.8647","url":null,"abstract":"<p><strong>Purpose: </strong>To evaluate the circumferential bone level and morphologic changes in the posterior mandibular ridge of mandibular overdenture wearers submitted to conventional and immediate loading through CBCT at 1 and 3 years.</p><p><strong>Materials and methods: </strong>In total, 20 participants who received two narrow-diameter implants (NDIs; Facility-Equator, Neodent; 2.9 × 10 mm) were randomly allocated to the conventional loading (CL; n = 10) or immediate loading (IL; n = 10) group. CBCT scans were performed in each group to analyze the vertical bone level (VBL) and horizontal bone level (HBL) around the implants, analyzed together with the posterior bone remodeling of the mandible measured at distances of 5, 10, 15, and 20 mm from the mental foramen (L1 to L4, respectively). Differences between groups were verified using Student t test at a significance level of 5%.</p><p><strong>Results: </strong>The IL group showed a significantly higher HBL in the first year (P = .028) and a significantly higher VBL in the third year (P = .032), with an HBL of -0.22 mm and VBL of -0.59 mm, respectively. After the third year, the percentage of cortical and medullary height indicated that the IL group presented a significantly higher percentage of cortical bone height (40.1 ± 9.3 mm) compared to the CL group (31.8 ± 5.8 mm) at position L1 (P = .05). No difference was found for posterior ridge remodeling (P > .05).</p><p><strong>Conclusions: </strong>The IL group showed slightly higher HBL and VBL values and locally displayed more replacement of medullary bone by cortical bone. However, circumferential bone levels in the IL group were still clinically acceptable, and the posterior resorption rate remained stable after 3 years of function, irrespective of the loading type.</p>","PeriodicalId":94232,"journal":{"name":"The International journal of prosthodontics","volume":"0 0","pages":"625-633"},"PeriodicalIF":0.0,"publicationDate":"2024-11-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139975194","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"INFLUENCE OF THICKNESS AND THERMOCYCLING ON TENSILE STRENGTH OF TWO RESIN-BASED CEMENTS USED FOR OVERDENTURES BAR-TYPE ATTACHMENTS: AN IN VITRO STUDY.","authors":"Francesco Grande, Massimo Carossa, Alessandro Mosca Balma, Nicola Scotti, Federico Mussano, Santo Catapano","doi":"10.11607/ijp.8673","DOIUrl":"10.11607/ijp.8673","url":null,"abstract":"<p><strong>Purpose: </strong>To evaluate the tensile strength of five different thicknesses of two resin cements placed between two titanium surfaces, before and after aging.</p><p><strong>Materials and methods: </strong>One hundred grade-5 titanium models were used, each composed of two surfaces simulating a semiprecision attachment for overdenture and its housing in the framework. Samples were cemented using two different resin cements (SoloCem and OT-Cem). Five groups representing five different cement thicknesses (from 50 to 250 μm) were created by varying the housing diameter. Half of the samples underwent a tensile strength test 24 hours after luting, while the other half underwent a tensile strength after 30,000 thermic cycles from 5°C to 55°C. Shapiro-Wilk and ANOVA with post-hoc tests were performed to relate the tensile strength to the variables: cement type, thermal aging, and cement thickness (P < .05).</p><p><strong>Results: </strong>Statistical differences were found between the cements both at T0 and T1; the mean values of tensile strength of SoloCem were three times higher than those of OT-Cem. The thermic cycles determined a reduction of the tensile force values for both cements; statistical evidence was found only for the SoloCem, except for the 100 μm thickness group. Significant differences were also found between the cement thicknesses of both cements, with 50 μm and 100 μm expressing the best tensile strength. Most of the fractures were of cohesive nature.</p><p><strong>Conclusions: </strong>SoloCem showed a higher tensile strength than OT-Cem but was more stressed by aging. For each group, the cement thickness influenced the tensile strength values with an inverse relationship.</p>","PeriodicalId":94232,"journal":{"name":"The International journal of prosthodontics","volume":"0 0","pages":"244-253"},"PeriodicalIF":0.0,"publicationDate":"2024-11-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41160132","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Reflections on Future Research Directions in Prosthodontics.","authors":"Irena Sailer","doi":"10.11607/ijp.2024.6.e","DOIUrl":"https://doi.org/10.11607/ijp.2024.6.e","url":null,"abstract":"","PeriodicalId":94232,"journal":{"name":"The International journal of prosthodontics","volume":"37 6","pages":"604"},"PeriodicalIF":0.0,"publicationDate":"2024-11-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142694076","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Psychologic Factors in Temporomandibular Disorders and Somatization: A Multidimensional Analysis of Personality, Coping, and Distress Among Young Adults.","authors":"Adrian Ujin Yap, Carolina Marpaung","doi":"10.11607/ijp.8590","DOIUrl":"10.11607/ijp.8590","url":null,"abstract":"<p><strong>Purpose: </strong>To analyze the association of temporomandibular disorders (TMDs) and somatic symptoms with the psychologic variables of personality, coping, and distress in young adults. Physical and psychologic correlates were also explored, along with the risk factors for TMDs/somatization.</p><p><strong>Materials and methods: </strong>Participants were enlisted from a local university, and the presence of TMDs and somatic symptoms was determined with the Short-form Fonseca Anamnestic Index and Patient Health Questionnaire-15. The psychologic variables of personality, coping, and distress were assessed with the Big-Five Personality Inventory-10; brief-COPE Inventory; and Depression, Anxiety, Stress Scales-21, respectively. Statistical evaluations were performed with Mann-Whitney U test, Spearman correlation, and logistic regression analyses (α = .05).</p><p><strong>Results: </strong>Among the 455 participants (mean age: 22.7 ± 1.2 years), 18.2% and 5.7% had TMDs and medium-to-high somatization, respectively. Participants with TMDs exhibited substantially higher somatization and psychologic distress scores than those with no TMDs. Significant differences in TMDs, conscientiousness, extraversion, and psychologic distress scores were observed between participants with no-to-mild and medium-to-high somatization. The association between TMD and somatization scores was weak but significant. Neuroticism and dysfunctional coping style were moderately correlated to general distress, depression, anxiety, and stress (rs = 0.44 to 0.62).</p><p><strong>Conclusions: </strong>Findings suggest that anxiety is the main risk factor for the presence of TMDs and medium-tohigh somatization in nonclinical young adults, while conscientiousness is a protective factor for somatization.</p>","PeriodicalId":94232,"journal":{"name":"The International journal of prosthodontics","volume":"0 0","pages":"605-614"},"PeriodicalIF":0.0,"publicationDate":"2024-11-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41224507","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Resistance of Glaze Application on Indirect Restorative CAD/CAM Materials Against Abrasive Toothbrushing Wear.","authors":"Rodrigo de Castro Albuquerque, Beatriz Ometto Sahadi, Carolina Bosso André, Paulo Matias Moreira, Frederick Allen Rueggeberg, Marcelo Giannini","doi":"10.11607/ijp.8604","DOIUrl":"10.11607/ijp.8604","url":null,"abstract":"<p><strong>Purpose: </strong>To evaluate the effect of toothbrushing on the surface roughness (Sa), roughness profile (Rv), gloss units (GU), and surface morphology of three glazed ceramics.</p><p><strong>Materials and methods: </strong>Specimens (n = 7) were made from the following different CAD/CAM materials and evaluated: lithium disilicate-based glass ceramic (EM); zirconia-reinforced lithium silicate glass ceramic (CE); and 6 mol% yttria partially-stabilized zirconia (IN). IPS e.max CAD (EM) and InCoris (IN) specimens were sintered, and all groups were prepolished and glazed according to the manufacturer's recommendations using IPS Ivocolor Glaze Paste (Ivoclar Vivadent) or Universal Overglaze High Flu (Dentsply/Sirona). Sa, Rv, GU, and morphology were analyzed before and after brushing at 30,000, 120,000, and 180,000 cycles. The data of Sa and GU were analyzed with ANOVA two-way and post hoc Tukey tests (α = .05). Rv was analyzed with Kruskal-Wallis and Student-Newman- Keuls tests. Surface morphology was analyzed qualitatively.</p><p><strong>Results: </strong>Sa decreased significantly after 180,000 toothbrushing cycles for all materials tested. CE showed higher Rv than EM and IN, and IN showed the highest GU after 180,000 toothbrushing cycles, which promoted a polishing effect for all materials.</p><p><strong>Conclusions: </strong>Long-term toothbrushing did not jeopardize the glazed surface of all tested materials compared to lack of brushing.</p>","PeriodicalId":94232,"journal":{"name":"The International journal of prosthodontics","volume":"0 0","pages":"659-666"},"PeriodicalIF":0.0,"publicationDate":"2024-11-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138292679","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}