Journal of Prosthetic Dentistry最新文献

{"title":"Letter to Editor: Concerns regarding the article, “Using a smartphone three dimensional scanning application (Polycam) to three dimensionally print an ear cast: A technique” by Inal et al","authors":"","doi":"10.1016/j.prosdent.2024.06.033","DOIUrl":"10.1016/j.prosdent.2024.06.033","url":null,"abstract":"","PeriodicalId":16866,"journal":{"name":"Journal of Prosthetic Dentistry","volume":null,"pages":null},"PeriodicalIF":4.3,"publicationDate":"2024-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141902040","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":"Digital prediction of smile line transition by using 2D photowrapping.","authors":"Shilpa Premarajan, Veena Jain, Ritu Duggal, Arun Kumar N","doi":"10.1016/j.prosdent.2024.09.006","DOIUrl":"https://doi.org/10.1016/j.prosdent.2024.09.006","url":null,"abstract":"<p><p>Dental practitioners often rehabilitate patients with excessive gingival display during the broad wide smile. The transition line is defined as the lip line, which depicts transition between the prosthesis and adjacent soft tissue. Correctly predicting and managing this transition line is especially important, as it determines esthetics when the patient smiles widely. Photowrapping is a digital technique used to trace the transition line on digital imaging and communications in medicine (DICOM) files by wrapping a 2-dimensional photograph onto the image, providing the soft tissue information required for esthetics and helping clinicians to determine accurately the need for bone reduction during implant planning. The imaging software program (Dolphin 3D; Patterson Dental Holdings, Inc) and photographs are used in this technique. This article presents a digital technique for tracing the dynamic smile line by photowrapping around the DICOM image.</p>","PeriodicalId":16866,"journal":{"name":"Journal of Prosthetic Dentistry","volume":null,"pages":null},"PeriodicalIF":4.3,"publicationDate":"2024-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142365581","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":"A machine learning based approach to standardizing tooth color and shade recommendations.","authors":"Qijing Li, Du Chen, Hang Wang, Jiefei Shen","doi":"10.1016/j.prosdent.2024.09.010","DOIUrl":"https://doi.org/10.1016/j.prosdent.2024.09.010","url":null,"abstract":"<p><strong>Statement of problem: </strong>Achieving the precise reproduction of tooth color is pivotal in esthetic restorations. However, existing visual and instrumental shade matching methods, each with inherent limitations, have often resulted in inconsistent color communication and subsequently suboptimal esthetic results in clinical practice.</p><p><strong>Purpose: </strong>The purpose of this in vitro study was to evaluate a 2-tier color correction strategy to accurately acquire standardized tooth color and to provide shade recommendations for esthetic restorations.</p><p><strong>Material and methods: </strong>Photographs of a standard color card (ColorChecker Classic; X-rite) and a commercially available shade guide (VITA 3D-Master; Vita Zahnfabrik) were captured under standard lighting conditions. Machine learning (ML) models for color correction, including polynomial regression (PR), backpropagation neural network (BPNN), and extreme learning machine (ELM), were trained using color values extracted from these standardized photographs. Subsequently, photographs made under clinical lighting conditions and featuring both the standard color card and the shade guide underwent the first color correction using the trained ML models. The secondary color correction was then executed based on the custom color space of VITA 3D-Master, yielding corrected color values for shade recommendations. The prediction accuracy of the ML models and the precision of color correction were evaluated using the root mean square error (RMSE), coefficient of determination (R²), and color difference (α=.05 for all statistical analyses).</p><p><strong>Results: </strong>Compared with the PR and BPNN models, the ELM model provided more precise and reliable predictions with the lowest RMSE (2.2) and the highest R² (0.996). After 2 rounds of color correction, the color difference was reduced from 7.6 to 1.0, which was lower than the 50:50% acceptability threshold (1.8) and closer to the 50:50% perceptibility threshold (0.8). Furthermore, the matching results between the secondary values and the ground truth of the shade guides achieved an accuracy of 73.1% for shade recommendations.</p><p><strong>Conclusions: </strong>The 2-tier color correction strategy based on the ML models and the color space specified by the VITA 3D-Master system effectively standardized the color of dental photographs and provided a more accurate and stable method of communicating color between dentists and dental laboratory technicians.</p>","PeriodicalId":16866,"journal":{"name":"Journal of Prosthetic Dentistry","volume":null,"pages":null},"PeriodicalIF":4.3,"publicationDate":"2024-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142365579","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":"Efficiency of dry versus wet Er,Cr:YSGG laser debonding of lithium disilicate veneers using different power outputs.","authors":"Soha Raafat, Maged Zohdy, Mohamed Eldemellawy, Rami Ghali, Doaa Taha","doi":"10.1016/j.prosdent.2024.09.008","DOIUrl":"https://doi.org/10.1016/j.prosdent.2024.09.008","url":null,"abstract":"<p><strong>Statement of problem: </strong>Since water is the chromophore for the erbium, chromium-yttrium scandium gallium garnet (Er,Cr:YSGG) laser, the laser energy reaching the restoration decreases as part of it is absorbed by water. Theoretically, reducing the water or implementing dry debonding could reduce the energy consumed by water, increasing laser efficiency. Studies on whether it is suitable for removing veneers without using coolant are lacking.</p><p><strong>Purpose: </strong>The purpose of this in vitro study was to evaluate the debonding time, intrapulpal temperature, and translucency of veneers during wet versus dry debonding with an Er,Cr:YSGG laser using different power outputs.</p><p><strong>Material and methods: </strong>Sixty-three maxillary central incisors were flattened labially to receive ceramic specimens. After cementation, ceramic specimens were irradiated with an Er,Cr:YSGG laser for debonding with different power outputs and water percentages (N=70): subgroup A1, 4 W and 1% water; A20, 4 W and 20% water; A40, 4 W and 40% water; B1, 5 W and 1% water; B20, 5 W and 20% water; B40, 5 W and 40% water; C1, 6 W and 1% water; C20, 6 W and 20% water; C40, 6 W and 40% water, and a control group of unbonded ceramic specimens. During debonding, the temperature rise and debonding time were evaluated, followed by the evaluation of the translucency and surface topography of the debonded specimens. Two-way analysis of variance (ANOVA) and the Dunnett test were used to analyze the data (α=.05).</p><p><strong>Results: </strong>The mean intrapulpal temperature rise varied significantly among groups B and C (P<.001), with the highest mean temperature rise found in subgroup B1 (4.00 ±0.00 ºC) and the lowest mean temperature rise in subgroup C20 (1.20 ±0.45 ºC). For the debonding time, the mean values of time required for debonding varied significantly among different groups (P<.001), with the longest time recorded in subgroup A1 (333.4 ±74.8 s) and the shortest time recorded in subgroup C20 (17.0 ±6.0 s). Only subgroups C1 (18.89 ±0.2) and C40 (18.60 ±0.2) showed a significantly lower translucency than the control group (19.44 ±0.06) (P<.001).</p><p><strong>Conclusions: </strong>Dry Er,Cr:YSGG laser debonding resulted in increased intrapulpal temperature when using high power outputs, but without exceeding the critical threshold of dental pulp temperature. Dry debonding also limited the transmission of laser energy, affecting the debonding efficiency. A power output of 5 W and 20% water can be considered efficient and safe laser parameters for debonding lithium disilicate veneers if their reuse is intended.</p>","PeriodicalId":16866,"journal":{"name":"Journal of Prosthetic Dentistry","volume":null,"pages":null},"PeriodicalIF":4.3,"publicationDate":"2024-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142365582","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 the reverse scan technique with an intraoral scanner and the traditional impression technique.","authors":"Pavel Hyspler, Petra Urbanová, Tatjana Dostalova","doi":"10.1016/j.prosdent.2024.08.012","DOIUrl":"https://doi.org/10.1016/j.prosdent.2024.08.012","url":null,"abstract":"<p><strong>Statement of problem: </strong>Intraoral scanners have many advantages but have limited applicability for extensive tooth-supported or implant-supported prostheses because of merging errors.</p><p><strong>Purpose: </strong>The purpose of this study was to compare the reverse scan technique (RST) with an intraoral scanner using the traditional impression technique both in vitro and in vivo.</p><p><strong>Material and methods: </strong>A participant was scanned 10 times with an intraoral scanner. Then, the RST was performed 3 times in the oral cavity. One of the intraoral scans was chosen to make a 3-dimensionally (3D) printed cast. The printed cast was scanned 10 times with a laboratory scanner (Control cast) and 10 times with an intraoral scanner (IOS cast). The RST was performed 10 times (RST cast), and 10 dental impressions were made using the traditional splinted technique on the same cast (Impression cast). A laboratory scanner was used to obtain standard tessellation language (STL) files of the tested methods. A newly developed pyramid replacement method was used to evaluate accuracy. This method uses modified virtual abutments with integrated pyramids that determine the exact measurement points. The obtained data were processed using Procrustes analysis and statistically analyzed (α=.05).</p><p><strong>Results: </strong>The Procrustes distances were Control cast 0 to 0.4 µm (median 0.3 µm), RST cast 5.6 to 6.9 µm (median 6.2 µm), Impression cast 5.4 to 7.1 µm (median 6.5 µm), and IOS cast group 4.5 to 41.2 µm (median 5.8 µm). In the participant, the Procrustes distance values were RST intraoral 9.5 to 9.6 µm (median 9.5 µm) and IOS intraoral 5.7 to 18.3 µm (median 10.9 µm).</p><p><strong>Conclusions: </strong>The reverse scan technique is an acceptable fully digital replacement for traditional impression making. Using an IOS to obtain a 3D cast of an implant-supported interim prosthesis with scannable implant analogs is not recommended. It is more beneficial to use laboratory scanners rather than intraoral scanners for the digitization of precision improvement devices such as bonded interim implant-supported prostheses with a scannable implant analog or solid index.</p>","PeriodicalId":16866,"journal":{"name":"Journal of Prosthetic Dentistry","volume":null,"pages":null},"PeriodicalIF":4.3,"publicationDate":"2024-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142365580","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 simulated intraoral adjustment on the color and translucency of gradient multilayered monolithic zirconia.","authors":"Reham Ghanem, Ahmed Adel, Walid Al-Zordk","doi":"10.1016/j.prosdent.2024.08.025","DOIUrl":"https://doi.org/10.1016/j.prosdent.2024.08.025","url":null,"abstract":"<p><strong>Statement of problem: </strong>The use of multilayered monolithic zirconia ceramics is becoming popular because it simplifies the production of esthetic restorations. The effect of clinical adjustment on the optical properties of these ceramics, especially strength-gradient zirconia, remains unclear.</p><p><strong>Purpose: </strong>The purpose of this in vitro study was to evaluate the color and translucency of gradient multilayered zirconia brands after grinding and polishing.</p><p><strong>Material and methods: </strong>Sixty 10×10×1-mm monolithic zirconia specimens were milled from 6 zirconia brands (Ceramill Zolid HT White, Ceramill Zolid HT Preshade, Ceramill Zolid FX Multicolor, VITA YZ XT Multicolor, IPS e.max ZirCAD Prime, and KATANA YML). The zirconia specimens were milled to include all layers of A2 preshaded multilayered zirconia blanks (A2 shade) except Ceramill Zolid HT White and Ceramill Zolid HT Preshade. Ceramill Zolid HT White specimens were milled from a white zirconia blank with subsequent shading. The color coordinates and the relative translucency parameter after glazing and after grinding and polishing were determined with a reflectance spectrophotometer, and the relative translucency parameter and contrast ratio were measured. The differences in color and translucency were calculated. The data were analyzed using 2-way ANOVA and 1-way ANOVA tests followed by the post hoc Tukey test (α=.05).</p><p><strong>Results: </strong>Statistically significant changes (P<.001) in the color coordinates measured before and after grinding and polishing were detected for each zirconia brand except for the KATANA YML that showed no significant difference (P=.686) in lightness. The highest color difference after grinding and polishing was detected in group KATANA YML. The 2-way ANOVA test showed a statistically significant interaction (P<.001) between the zirconia brand and the grinding and polishing regarding the relative translucency parameter. The zirconia brand had a significant impact on the relative translucency parameter before and after grinding and polishing (both P<.001).</p><p><strong>Conclusions: </strong>Except for KATANA YML, the color change in multilayered zirconia after clinical adjustment with polishing was not beyond the clinically acceptable limit of the color difference. Although clinical adjustment with polishing reduced the translucency of gradient zirconia, the change in translucency was below the clinically detectable threshold value of the translucency difference.</p>","PeriodicalId":16866,"journal":{"name":"Journal of Prosthetic Dentistry","volume":null,"pages":null},"PeriodicalIF":4.3,"publicationDate":"2024-09-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142348939","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":"Finite element modeling of an intact and cracked mandibular second molar under quantitative percussion diagnostics loading.","authors":"Jie Shen, Nasrin Taheri-Nassaj, Cherilyn G Sheets, James C Earthman","doi":"10.1016/j.prosdent.2024.09.003","DOIUrl":"https://doi.org/10.1016/j.prosdent.2024.09.003","url":null,"abstract":"<p><strong>Statement of problem: </strong>Quantitative percussion diagnostics (QPD) has been devised to nondestructively evaluate the mechanical integrity of human teeth and implants, the mechanical integrity of the underlying bone, and the presence of cracks, but the mechanism is not clearly understood.</p><p><strong>Purpose: </strong>The purpose of this study is to better understand the dynamic behavior of a tooth under conditions consistent with QPD by focusing on physiologically accurate 3D finite element models of a human mandibular second molar with surrounding tissues.</p><p><strong>Material and methods: </strong>Finite element analysis (FEA) was used to study the force response of dental structures measured by the sensor in a QPD handpiece. A defect-free (intact) and a cracked tooth model containing a vertical crack involving enamel, dentin, periodontal ligament, bone, and the QPD percussion rod were used for this purpose. Different crack gap spaces were studied for comparison. The FEA model was validated with clinical QPD data for a second mandibular molar containing a vertical crack that subsequently had to be extracted. The location and size of the vertical crack was determined once the tooth was extracted.</p><p><strong>Results: </strong>The present FEA results exhibited features consistent with those of corresponding clinical data, thus verifying the model. An examination of the relative acceleration of the crack faces with respect to each other revealed that an oscillation between the crack surfaces results in secondary peaks in the QPD energy return response compared with that of an intact tooth.</p><p><strong>Conclusions: </strong>The present FEA modeling can generate simulated QPD results that exhibit established distinguishing characteristics in clinical QPD data for intact and cracked second mandibular molars. The model results also give insight into how QPD detects the presence of cracks and show that the oscillation of crack surfaces can produce the multipeak QPD results for a cracked molar observed clinically.</p>","PeriodicalId":16866,"journal":{"name":"Journal of Prosthetic Dentistry","volume":null,"pages":null},"PeriodicalIF":4.3,"publicationDate":"2024-09-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142348950","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":"Letter to the Editor regarding \"Influence of occlusal collision corrections completed by two intraoral scanners or a dental design program on the accuracy of the maxillomandibular relationship\".","authors":"Jiehua Tian, Yuqi Han","doi":"10.1016/j.prosdent.2024.08.026","DOIUrl":"https://doi.org/10.1016/j.prosdent.2024.08.026","url":null,"abstract":"","PeriodicalId":16866,"journal":{"name":"Journal of Prosthetic Dentistry","volume":null,"pages":null},"PeriodicalIF":4.3,"publicationDate":"2024-09-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142348951","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":"Effectiveness of trans-sinus dental implants in the complete arch rehabilitation of the edentulous maxilla: A systematic review and meta-analysis.","authors":"Pedro Henrique da Hora Sales, Demóstenes Alves Diniz, Paulo Goberlânio de Barros Silva, Alessandra de Albuquerque Tavares Carvalho, Paolo Vescovi, Marco Meleti, Jair Carneiro Leão","doi":"10.1016/j.prosdent.2024.08.003","DOIUrl":"https://doi.org/10.1016/j.prosdent.2024.08.003","url":null,"abstract":"<p><strong>Statement of problem: </strong>Systematic reviews to determine the effectiveness of oral rehabilitation with trans-sinus dental implants in patients with an atrophic maxilla are lacking.</p><p><strong>Purpose: </strong>The purpose of this systematic review was to determine the effectiveness of trans-sinus dental implants installed in patients with an atrophic maxilla.</p><p><strong>Material and methods: </strong>Searches were conducted in 5 databases including the nonpeer-reviewed literature up to March 2024 by 2 independent reviewers according to established inclusion and exclusion criteria and according to the question: Can trans-sinus implants be a suitable option for the rehabilitation of the atrophic maxilla? The meta-analysis was carried out using the Revman software program for the variables implant loss and marginal bone loss using a 95% confidence interval. The risk of bias in the studies was determined using the ROBINS I tool.</p><p><strong>Results: </strong>A total of 1884 articles were initially found in the researched databases, of which 4 were included in this systematic review. Three were observational studies, and 1 a randomized clinical trial. A total of 144 participants with 658 implants were evaluated (207 trans-sinus) with a 97.2% effectiveness. No statistically significant difference was found in effectiveness when comparing trans-sinus implants and conventional implants (P=.14, I2: 0%), and also no statistically significant difference was found in relation to marginal bone loss between the groups (P=.47, I2: 91%). None of the studies analyzed presented a low risk of bias.</p><p><strong>Conclusions: </strong>The use of trans-sinus implants in the rehabilitation of atrophic edentulous jaws represents a suitable option with a high success rate. However, the small number of controlled studies on the subject and the high risk of bias are important factors that must be considered before choosing this therapy. New controlled studies with high methodological rigor must be carried out to determine the effectiveness of trans-sinus implants in the rehabilitation of atrophic jaws.</p>","PeriodicalId":16866,"journal":{"name":"Journal of Prosthetic Dentistry","volume":null,"pages":null},"PeriodicalIF":4.3,"publicationDate":"2024-09-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142348948","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":"Factors associated with mandibular deviation and proposed classification and treatment guidelines for applying mandibular guidance: A retrospective analysis of 185 patients with segmental mandibulectomy.","authors":"Lokendra Gupta, Aseem Mishra, Sandeep V Gurav, Kanchan Dholam, Ankita Pal, Avinash Kumar","doi":"10.1016/j.prosdent.2024.08.017","DOIUrl":"https://doi.org/10.1016/j.prosdent.2024.08.017","url":null,"abstract":"<p><strong>Statement of problem: </strong>Mandibular guidance therapy is the preferred treatment for patients with segmental mandibulectomy after oncological surgeries. Clinicians face difficulty in decision making and delivering appropriate prosthetic treatment for the rehabilitation of these patients because of the lack of published information.</p><p><strong>Purpose: </strong>The purpose of this retrospective analysis was to evaluate the factors associated with mandibular deviation and to introduce a classification system of mandibular deviation and prosthetic guidelines for rehabilitating patients with segmental mandibulectomy using a mandibular guidance appliance (MGA).</p><p><strong>Material and methods: </strong>A total of 185 patients with segmental mandibulectomies without bony reconstruction were evaluated from July 2019 to July 2022 for factors affecting the mandibular deviation and the feasibility of rehabilitating these patients with various types of MGA. Patients reconstructed with a free fibula osteocutaneous flap and those who underwent marginal mandibulectomies without mandibular deviation were excluded from the analysis. Based on the extent of mandibular deviation, the condition of oral tissues, and the functional activity, patients were classified into 1 of 5 classes and treated with an appropriate MGA. Data were analyzed with the Kruskal-Wallis and Fisher exact tests (α=.05).</p><p><strong>Results: </strong>Of 185 patients, 45 (24.3%) showed no mandibular deviation and were classified into class I without the need for a guidance appliance; 114 (61.6%) showed mild mandibular deviation, were classified into class II, and were treated with a mandibular guide plane prosthesis (MGPP); 7 (3.8%) showed moderate mandibular deviation, were classified into class III, and were treated with a progressive mandibular guide plane prosthesis (Progressive MGPP); 5 (2.7%) showed severe mandibular deviation with fibrosis, were classified into class IV, and were treated with an occlusal ramp prosthesis; and 14 (7.6%) showed compromised oral conditions, were classified into class V, and did not receive any type of MGA. Patients with M0, poorly differentiated squamous cell carcinoma and those who had received radiotherapy showed more mandibular deviation (P<.05). The degree of mandibular deviation increased from Class I to Class IV and was significantly associated with the time gap between surgical intervention and MGA delivery (P<.05).</p><p><strong>Conclusions: </strong>Radiotherapy and delay in delivering the MGA had a significant effect on mandibular deviation. The proposed classification and prosthetic guidelines were based on the mandibular deviation and will help clinicians in decision making and planning treatment before delivering the MGA.</p>","PeriodicalId":16866,"journal":{"name":"Journal of Prosthetic Dentistry","volume":null,"pages":null},"PeriodicalIF":4.3,"publicationDate":"2024-09-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142348949","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}