Bin Honjo, Yosuke Yamazaki, Maki Yuguchi, Keitaro Isokawa
{"title":"Tomographic and 3-dimensional imaging of the larger recurved caniniform teeth on the jawbone of Caprodon schlegelii.","authors":"Bin Honjo, Yosuke Yamazaki, Maki Yuguchi, Keitaro Isokawa","doi":"10.2334/josnusd.24-0414","DOIUrl":"10.2334/josnusd.24-0414","url":null,"abstract":"<p><strong>Purpose: </strong>This study aimed to characterize the 3-dimensional morphology of larger recurved caniniform teeth (LrCTs) and their underlying intraosseous structures in Caprodon schlegelii.</p><p><strong>Methods: </strong>Specimens (n = 5) with a total length of approximately 32 cm were fixed and processed for micro-computed tomography and/or stereomicroscopy. Volume data of the LrCT-bearing jaws were examined using volume rendering images.</p><p><strong>Results: </strong>The LrCTs were identified in six locations on the jawbones: anteriorly, a pair of LrCTs in each of the jaw quadrants, and posteriorly, tandemly aligned rows of LrCTs in the dentary bones. In both cases, two adjacent LrCTs were in different stages of tooth life, namely, developmental and functional stages. Large intraosseous chambers contained the tooth germ area or were connected to the pulp of the overlying LrCTs. In the lower jaw, the chambers beneath the anterior and posterior LrCTs were connected to the canal systems, which were distributed in the lower and upper halves of the dentary bone, respectively.</p><p><strong>Conclusion: </strong>The presence of LrCTs in six different locations on the jaws is a distinguishing feature of C. schlegelii, and a balanced replacement between developing and functional LrCTs is likely to ensure the mode and behavior of feeding in this species.</p>","PeriodicalId":16646,"journal":{"name":"Journal of oral science","volume":"67 1","pages":"46-52"},"PeriodicalIF":1.9,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143006837","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Differences in the effectiveness of stabilization splints between the categories of sleep bruxism.","authors":"Yasushi Onoguchi, Kyosuke Oki, Yoshihiro Tsukiyma, Yasunori Ayukawa, Kiyoshi Koyano","doi":"10.2334/josnusd.24-0233","DOIUrl":"https://doi.org/10.2334/josnusd.24-0233","url":null,"abstract":"<p><strong>Purpose: </strong>The present study investigated the effects of stabilization splints on two categories of sleep bruxism using a portable electromyographic recording system.</p><p><strong>Methods: </strong>Twenty-six individuals confirmed as mild to severe bruxers by nocturnal masseter electromyographic episodes were enrolled in the study. Participants wore a stabilization splint during sleep for 30 nights, and masseter muscle activity was measured at baseline, immediately after, and 1 and 4 weeks after insertion of the splint. Bursts in masseter electromyographic episodes were separated into phasic bursts or tonic bursts, then each burst was analyzed in terms of duration, frequency, and magnitude of bursts.</p><p><strong>Results: </strong>The frequency of phasic bursts significantly decreased immediately after insertion of the splint compared with the baseline. The geometric mean magnitude of tonic bursts decreased when wearing the splint compared with the baseline.</p><p><strong>Conclusion: </strong>These findings suggest that stabilization splints reduce jaw-muscle activity during sleep in patients suffering from sleep bruxism by reducing the frequency of phasic bursts in the short term and reducing the magnitude of tonic bursts over a longer period.</p>","PeriodicalId":16646,"journal":{"name":"Journal of oral science","volume":"67 2","pages":"101-105"},"PeriodicalIF":1.9,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144009577","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Novel approach for forensic dental identification using maxillary homologous models.","authors":"Isuruni Kuruppuarachchige, Upul Cooray, Toshihiko Suzuki, Moe Kosaka, Yuka Hatano","doi":"10.2334/josnusd.24-0332","DOIUrl":"https://doi.org/10.2334/josnusd.24-0332","url":null,"abstract":"<p><strong>Purpose: </strong>As three-dimensional (3D) intraoral scans are becoming popular in modern dentistry, they also offer a new category of antemortem data for forensic identification. This study proposes a novel methodology for individual identification based on 3D homologous models of the maxilla.</p><p><strong>Methods: </strong>Data from 100 maxillary plaster casts (40 monozygotic twin casts, 28 dizygotic twin casts and 32 singleton casts) were used. From the initial sample, 10 casts were randomly chosen and duplicated four times, resulting in 40 duplicates. These were divided into four groups and subjected to the following alterations: molar attrition (n = 10), canine attrition (n = 10), molar and canine attrition (n = 10), and no alteration (n = 10). All the casts were converted to 3D models and then to homologous models using a template with 24 landmarks. The 3D coordinates of each vertex in the homologous model were then calculated and used for statistical comparison of similarity between two given homologous models using the average Hausdorff distance.</p><p><strong>Results: </strong>All four groups achieved accurate matching with their original maxillary casts, with a minimal average Hausdorff distance.</p><p><strong>Conclusion: </strong>This method accurately identified individuals, including monozygotic twins, and exhibited robustness against minor tooth attrition, demonstrating its feasibility as an identification method in actual forensic settings.</p>","PeriodicalId":16646,"journal":{"name":"Journal of oral science","volume":"67 2","pages":"59-64"},"PeriodicalIF":1.9,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144018553","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Effect of sintering temperature on crystal structure, optical and thermal properties, and surface roughness and topography of nanolithium disilicate and zirconia-reinforced nanolithium silicate ceramics.","authors":"Supontep Teerakanok, Chatcharwin Ungurawasaporn, Pitchaporn Kosago, Boonlert Kukiattrakoon","doi":"10.2334/josnusd.24-0318","DOIUrl":"https://doi.org/10.2334/josnusd.24-0318","url":null,"abstract":"<p><strong>Purpose: </strong>This study evaluated the effects of sintering temperature on the crystal structure, optical and thermal properties, and surface roughness and topography of nanolithium disilicate ceramics (NLDS) and zirconia-reinforced nanolithium silicate ceramics (ZNLS).</p><p><strong>Methods: </strong>One hundred and twenty specimens of each ceramics were prepared and divided into 4 groups on the basis of sintering temperature. The specimens were then subjected to X-ray diffraction (XRD), spectrophotometric analysis of optical properties, differential thermal analysis (DTA), thermal gravimetrical analysis (TGA), roughness analysis, scanning electron microscopy (SEM), and energy dispersive X-ray (EDX) spectrometry. The data were analyzed using one-way analysis of variance followed by Tukey's test (α = 0.05)Results: XRD confirmed the presence of lithium disilicate, lithium phosphate, lithium metasilicate, and quartz in NLDS and ZNLS specimens. TGA, DTA, and average roughness did not significantly differ between groups (P < 0.05). Among NLDS groups, NLDS4 had ∆E values that significantly differed from those of the other groups (P < 0.05). EDX showed that NLDS2 had the highest Si value (25.3 ± 0.1 wt%) followed by NLDS4 (24.8 ± 0.1 wt%). Among ZNLS groups, ZNLS2-4 had a clinically acceptable ∆E. EDX analysis showed no significant difference for any group.</p><p><strong>Conclusion: </strong>Sintering temperature did not affect the evaluated properties of NLDS. However, sintering ZNLS at different temperatures might affect the tested properties.</p>","PeriodicalId":16646,"journal":{"name":"Journal of oral science","volume":"67 2","pages":"77-82"},"PeriodicalIF":1.9,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143988969","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"A retrospective cross-sectional analysis of the association between the number of medications and oral functions in university hospital outpatients.","authors":"Kaori Nishimura, Yoichiro Ogino, Yasunori Ayukawa","doi":"10.2334/josnusd.24-0281","DOIUrl":"10.2334/josnusd.24-0281","url":null,"abstract":"<p><strong>Purpose: </strong>The purpose of this study was to analyze the association between the number of medications and oral functions.</p><p><strong>Methods: </strong>The study participants were selected from individuals who were attending regular follow-up as hospital outpatients. Patient profiles, the number of medications used, and measured values of oral function were extracted. These data were analyzed statistically for sex, age, and grouping according to the number of medications taken (no medication, G1; 1-4 medications, G2; ≥5 medications, G3). Conditional logistic regression analysis was performed to evaluate the effects of medications on oral function.</p><p><strong>Results: </strong>A total of 172 patients (66 males and 106 females) were registered; 50 participants belonged to G1, 68 to G2, and 54 to G3. Significant inter-group differences were identified for tongue-lip motor function (oral diadochokinesis: ODK) and maximum tongue pressure in terms of age, but not in terms of sex. G3 showed significantly lower ODK than G1, and logistic regression analysis revealed that the number of medications was significantly associated with ODK/pa/. Age and MTP also significantly affected ODK/ta/ and /ka/.</p><p><strong>Conclusion: </strong>Within the limitations of this study, the present findings suggest that the number of medications taken has an impact on tongue-lip motor function.</p>","PeriodicalId":16646,"journal":{"name":"Journal of oral science","volume":"67 1","pages":"41-45"},"PeriodicalIF":1.9,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143006643","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Effectiveness of silicone mask fitters for reduction of diffuse composite dust leakage during removal of bonded attachments for clear aligners.","authors":"Passakorn Sirichai, Neeranart Thirasupa, Kwanchanok Youcharoen, Nirada Dhanesuan, Nonglak Sombuntham","doi":"10.2334/josnusd.24-0470","DOIUrl":"https://doi.org/10.2334/josnusd.24-0470","url":null,"abstract":"<p><strong>Purpose: </strong>This study investigated effectiveness of a silicone mask fitter for reduction of composite particle leakage during removal of bonded attachments for clear aligners compared with a surgical mask and an N95 respirator.</p><p><strong>Methods: </strong>Composite particles passing through masks were measured using a particle counter machine during removal of attachments bonded on a dentoform using a slow-speed handpiece. The samples were: Group 1: a surgical mask; Group 2: a surgical mask with a silicone mask fitter; and Group 3: an N95 respirator. The experiments were repeated six times per group. Differences among the groups were assessed using one-way analysis of variance and post hoc tests.</p><p><strong>Results: </strong>The mean concentration of total composite particles behind the surgical mask with the silicone mask fitter was significantly lower than that behind a surgical mask alone (61.01 ± 13, 209.69 ± 66 particles/cubic foot (ft<sup>3</sup>)/min × 10<sup>3</sup>, respectively, P < 0.001), while there was not significantly different from the N95 respirator (12 ± 3 particles/ft<sup>3</sup>/min × 10<sup>3</sup>).</p><p><strong>Conclusion: </strong>Use of a surgical mask alone was associated with significant leakage of composite dust. The effectiveness of the silicone mask fitter for preventing the entry of diffuse particles was comparable to that of the N95 respirator.</p>","PeriodicalId":16646,"journal":{"name":"Journal of oral science","volume":"67 3","pages":"152-157"},"PeriodicalIF":1.9,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144649767","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Antimicrobial potential and biological properties of modified glass-ionomer cement supplemented with chlorhexidine diacetate.","authors":"Suwanna Jitpukdeebodintra, Sissada Tannukit, Nattapon Rotpenpian","doi":"10.2334/josnusd.25-0068","DOIUrl":"https://doi.org/10.2334/josnusd.25-0068","url":null,"abstract":"<p><strong>Purpose: </strong>This study aimed to investigate the minimum inhibitory concentration (MIC) and biological properties of modified glass-ionomer cement (BIO-GIC) supplemented with chlorhexidine diacetate (CHX).</p><p><strong>Methods: </strong>The BIO-GIC was originally a combining formulation of conventional glass-ionomer cement, chitosan, albumin and tricalcium phosphate. CHX was incorporated at various concentrations of 1.25%, 2%, 2.5%, 5%, 7.5% and 10%. Antimicrobial activity against certain microorganisms related to cariogenesis Streptococcus mutans (S. mutans), Streptococcus sanguinis (S. sanguinis), and Enterococcus faecalis (E. faecalis), was evaluated by microdilution test. One effective concentration of CHX was mixed with Penaeus merguiensis-Translationally Controlled Tumor Protein (Pmer-TCTP) and further conducted by biological tests including cell viability and mineralization in dental pulp.</p><p><strong>Results: </strong>S. mutans were inhibited at 7.5% CHX-modified BIO-GIC, while S. sanguinis and E. faecalis showed no inhibition at any concentration. Cell viability significantly decreased with 7.5% CHX-modified BIO-GIC after 72 h. Dental pulp exposed to this group formed smaller and fewer calcium nodules but adding Pmer-TCTP reduced cell death and slightly enhanced mineralization.</p><p><strong>Conclusion: </strong>7.5% CHX-modified BIO-GIC shows potential for inhibiting S. mutans and having potential cell viability and mineralization in dental pulp cells.</p>","PeriodicalId":16646,"journal":{"name":"Journal of oral science","volume":"67 3","pages":"146-151"},"PeriodicalIF":1.9,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144649766","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Zaid Dohan, Lara T Friedlander, Paul R Cooper, Kai Chun Li, Jithendra T Ratnayake, May Lei Mei
{"title":"Effect of calcium and phosphate in an artificial chemical model of root caries formation.","authors":"Zaid Dohan, Lara T Friedlander, Paul R Cooper, Kai Chun Li, Jithendra T Ratnayake, May Lei Mei","doi":"10.2334/josnusd.24-0427","DOIUrl":"https://doi.org/10.2334/josnusd.24-0427","url":null,"abstract":"<p><strong>Purpose: </strong>To investigate the mineral density of artificial root caries lesions formed under varying concentrations of calcium phosphate, with or without the presence of fluoride.</p><p><strong>Methods: </strong>Sixty-four human tooth root blocks were exposed to various lactic acid solutions for 96 h. These included a low concentration (0.16 mM) of calcium chloride and potassium dihydrogen phosphate (Group L), a low concentration (0.16 mM) of calcium chloride and potassium dihydrogen phosphate with 0.5 ppm fluoride (with sodium fluoride) (Group LF), a high concentration (2.2 mM) of calcium chloride and potassium dihydrogen phosphate (Group H), and a high concentration (2.2 mM) of calcium chloride and potassium dihydrogen phosphate with 0.5 ppm fluoride (Group HF). The mineral loss in the artificial lesions formed was measured using micro-computed tomography.</p><p><strong>Results: </strong>The mineral loss in groups L, LF, H and HF was 35.38 ± 2.15%, 31.96 ± 2.1%, 32.58 ± 1.15%, and 27.78 ± 2.3%, respectively. A significant difference (P < 0.001) was observed between groups L and LF, groups LF and HF, groups H and HF, and groups L and HF. Calcium phosphate and fluoride exposure both had significant effects (P < 0.001) on mineral loss.</p><p><strong>Conclusion: </strong>Artificial root caries lesions were associated with decreased mineral loss in solutions containing higher concentrations of calcium phosphate or in the presence of fluoride, compared with those formed in solutions with lower calcium phosphate concentrations or without fluoride.</p>","PeriodicalId":16646,"journal":{"name":"Journal of oral science","volume":"67 2","pages":"96-100"},"PeriodicalIF":1.9,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143977091","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Journal of oral sciencePub Date : 2024-10-16Epub Date: 2024-08-28DOI: 10.2334/josnusd.24-0084
Bilal L Alkrayem, Yuichi Yamatani, Nehasha Pradhan, Yuka I Sumita, Noriyuki Wakabayashi
{"title":"CAD-CAM for removable partial denture fabrication after marginal mandibulectomy based on a well-adjusted pre-existing denture.","authors":"Bilal L Alkrayem, Yuichi Yamatani, Nehasha Pradhan, Yuka I Sumita, Noriyuki Wakabayashi","doi":"10.2334/josnusd.24-0084","DOIUrl":"10.2334/josnusd.24-0084","url":null,"abstract":"<p><p>This clinical report summarizes a workflow that introduces two approaches for fabricating a metal framework removable partial denture for a marginal mandibulectomy patient. First, the pre-existing denture was adjusted according to the piezographic technique to determine the optimal configuration for adhering to the available denture space. Second, computer-aided design-computer-aided manufacturing (CAD-CAM) technology was used to fabricate a new removable partial denture by digitally scanning the oral condition and the well-adjusted denture and then using the obtained data to design and fabricate the new denture. These two approaches can help to reduce chair time not only for maxillofacial prosthetic treatment but also for other denture cases.</p>","PeriodicalId":16646,"journal":{"name":"Journal of oral science","volume":" ","pages":"258-261"},"PeriodicalIF":1.9,"publicationDate":"2024-10-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142093440","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Journal of oral sciencePub Date : 2024-10-16Epub Date: 2024-08-20DOI: 10.2334/josnusd.24-0061
David Bautista-Martinez, Rogelio J Scougall-Vilchis, Rosalía Contreras-Bulnes, Rene Garcia-Contreras
{"title":"Assessment of cytotoxicity, odontoblast-like differentiation, shear bond strength, and microhardness of four orthodontic adhesive composites.","authors":"David Bautista-Martinez, Rogelio J Scougall-Vilchis, Rosalía Contreras-Bulnes, Rene Garcia-Contreras","doi":"10.2334/josnusd.24-0061","DOIUrl":"10.2334/josnusd.24-0061","url":null,"abstract":"<p><strong>Purpose: </strong>To determine and compare the cytotoxicity, odontoblast-like differentiation, shear bond strength (SBS) and Vickers microhardness of four commercial light-cured orthodontic adhesives.</p><p><strong>Methods: </strong>The orthodontic resins selected were Transbond XT - GI, Transbond Plus Color Change - GII (both from 3M Unitek), Enlight - GIII and Blugloo - GIV (both from Ormco). Samples were prepared, and leached monomers were obtained. Cytotoxicity was evaluated using the 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide (MTT) assay and deposited calcium was analyzed using Alizarin red staining (ARS). SBS and the adhesive remnant index (ARI) were determined using 120 human premolars. The Vickers microhardness test was performed on the resin discs.</p><p><strong>Results: </strong>All adhesives showed moderate to severe cytotoxicity (21-37%) and promoted similar formation of calcium deposits. A SBS of 6-8 MPa was achieved only by Blugloo (7.1 ± 2.4 MPa), and Enlight showed the lowest Vickers hardness score (40 ± 2.5 HV). Transbond Plus Color Change (score 0 = 42.9%) and Blugloo (score 0 = 46.4%) showed better ARI scores than Transbond XT (score 0 = 7.1%) and Enlight (score 0 = 3.6%).</p><p><strong>Conclusion: </strong>On the basis of the properties evaluated, Blugloo seems to be the best option.</p>","PeriodicalId":16646,"journal":{"name":"Journal of oral science","volume":" ","pages":"220-225"},"PeriodicalIF":1.9,"publicationDate":"2024-10-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142017805","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}