Pub Date : 2024-11-01DOI: 10.1016/j.prosdent.2022.11.018
Brandon Yeager DMD MS , Gülce Çakmak DDS PhD , Fengyun Zheng DDS, PhD , William Michael Johnston PhD , Burak Yilmaz DDS PhD
<div><h3>Statement of problem</h3><div>Digital light processing (DLP), continuous liquid interface printing (CLIP), and stereolithography (SLA) technologies enable 3-dimensional (3D) printing of surgical guides. However, how their accuracy compares and how accuracy may affect subsequent steps in guided surgery is unclear.</div></div><div><h3>Purpose</h3><div>The purpose of this in vitro study was to investigate the fabrication and seating accuracy of surgical guides printed by using DLP, SLA, and CLIP technologies and evaluate the positional deviation of the osteotomy site and placed implant compared with the digital implant plan.</div></div><div><h3>Material and methods</h3><div>Twenty-one polyurethane<span> models were divided into 3 groups and used to plan implants and design surgical guides. The guides were fabricated by using DLP, SLA, or CLIP 3D printers (n=7) and scanned, and the scan file was compared with the digital design file to analyze the fabrication accuracy at the intaglio and overall external surfaces using root mean square (RMS) values. The triple scan protocol was used to evaluate the seating accuracy of the guides on their respective models. Osteotomies were prepared on models by using the guides followed by a microcomputed tomography image of each osteotomy. The implants were placed through the guides, the scan bodies were tightened to implants, and the models were scanned to obtain the images of placed implant position. Osteotomy and placed implant images were used to calculate the entry point, apex, and long axis deviations from the planned implant position with a software program. A 2-way repeated-measures ANOVA of the RMS data was used to analyze printing and seating trueness, and homogeneity of variance analyses were used at each surface for precision. A 3-way repeated-measures ANOVA was used to analyze distance deviations over the stages (osteotomy and final implant) and locations studied, and a 2-way repeated-measures ANOVA was used for angular deviations. Homogeneity of variance analyses were performed for precision (α=.05).</span></div></div><div><h3>Results</h3><div>The 3D printer type significantly affected the trueness of the guide at the intaglio surface (<em>P</em><.001). SLA guides had the lowest mean RMS (59.04 μm) for intaglio surface, while CLIP had the highest mean RMS (117.14 μm). Guides from all 3D printers had low variability among measured deviations and therefore were similarly precise. The seating accuracy of SLA and DLP guides was not significantly different, but both had lower mean RMS values than CLIP (<em>P</em>=.003 for SLA, <em>P</em>=.014 for DLP). There were no significant interactions between the stage of surgery, the printer type, or the location of implant deviation (<em>P</em>=.734). Only the location of deviation (cervical versus apical) had a significant effect on distance deviations (<em>P</em><.001). The printer type, stage of surgery, and their interaction did not significantly
{"title":"Error analysis of stages involved in CBCT-guided implant placement with surgical guides when different printing technologies are used","authors":"Brandon Yeager DMD MS , Gülce Çakmak DDS PhD , Fengyun Zheng DDS, PhD , William Michael Johnston PhD , Burak Yilmaz DDS PhD","doi":"10.1016/j.prosdent.2022.11.018","DOIUrl":"10.1016/j.prosdent.2022.11.018","url":null,"abstract":"<div><h3>Statement of problem</h3><div>Digital light processing (DLP), continuous liquid interface printing (CLIP), and stereolithography (SLA) technologies enable 3-dimensional (3D) printing of surgical guides. However, how their accuracy compares and how accuracy may affect subsequent steps in guided surgery is unclear.</div></div><div><h3>Purpose</h3><div>The purpose of this in vitro study was to investigate the fabrication and seating accuracy of surgical guides printed by using DLP, SLA, and CLIP technologies and evaluate the positional deviation of the osteotomy site and placed implant compared with the digital implant plan.</div></div><div><h3>Material and methods</h3><div>Twenty-one polyurethane<span> models were divided into 3 groups and used to plan implants and design surgical guides. The guides were fabricated by using DLP, SLA, or CLIP 3D printers (n=7) and scanned, and the scan file was compared with the digital design file to analyze the fabrication accuracy at the intaglio and overall external surfaces using root mean square (RMS) values. The triple scan protocol was used to evaluate the seating accuracy of the guides on their respective models. Osteotomies were prepared on models by using the guides followed by a microcomputed tomography image of each osteotomy. The implants were placed through the guides, the scan bodies were tightened to implants, and the models were scanned to obtain the images of placed implant position. Osteotomy and placed implant images were used to calculate the entry point, apex, and long axis deviations from the planned implant position with a software program. A 2-way repeated-measures ANOVA of the RMS data was used to analyze printing and seating trueness, and homogeneity of variance analyses were used at each surface for precision. A 3-way repeated-measures ANOVA was used to analyze distance deviations over the stages (osteotomy and final implant) and locations studied, and a 2-way repeated-measures ANOVA was used for angular deviations. Homogeneity of variance analyses were performed for precision (α=.05).</span></div></div><div><h3>Results</h3><div>The 3D printer type significantly affected the trueness of the guide at the intaglio surface (<em>P</em><.001). SLA guides had the lowest mean RMS (59.04 μm) for intaglio surface, while CLIP had the highest mean RMS (117.14 μm). Guides from all 3D printers had low variability among measured deviations and therefore were similarly precise. The seating accuracy of SLA and DLP guides was not significantly different, but both had lower mean RMS values than CLIP (<em>P</em>=.003 for SLA, <em>P</em>=.014 for DLP). There were no significant interactions between the stage of surgery, the printer type, or the location of implant deviation (<em>P</em>=.734). Only the location of deviation (cervical versus apical) had a significant effect on distance deviations (<em>P</em><.001). The printer type, stage of surgery, and their interaction did not significantly ","PeriodicalId":16866,"journal":{"name":"Journal of Prosthetic Dentistry","volume":"132 5","pages":"Pages 995-1004"},"PeriodicalIF":4.3,"publicationDate":"2024-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"10598821","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}
Pub Date : 2024-11-01DOI: 10.1016/j.prosdent.2023.07.040
Joyce A. Jonker BSc , Gil Tirlet DDS, PhD , Alex Dagba DDS , Solène Marniquet DDS , Marinus Ouwerkerk MSc , Marco S. Cune DDS, PhD , Marco M.M. Gresnigt DMD, PhD
Statement of problem
The absence of a tooth in the esthetic zone can cause emotional and social distress. The use of minimally invasive and visually pleasing lithium disilicate resin-bonded fixed dental prostheses (RBFDPs) may be a suitable option for replacing a missing maxillary incisor. However, the available literature on lithium disilicate cantilever RBFDPs is limited.
Purpose
This retrospective multicenter study assessed the survival and success rates of lithium disilicate anterior cantilever RBFDPs with an average follow-up period of 3 years up to 9 years.
Material and methods
RBFDPs delivered by 3 operators were clinically assessed for survival using a modified United States Public Health Service criteria list. The incidence density was determined for each criterion and operator. The standard error and 95% confidence interval were calculated for each incidence density difference (α=.05 for all analyses).
Results
A total of 108 RBFDPs were evaluated after a mean period of 32.45 months, ranging from 14 days to 111 months. None of the restorations exhibited failure, carious lesions, or fractures during the follow-up period. The primary reasons for reduced success rates were inflammation of the surrounding soft tissues and discoloration, with incidence densities of 0.074 and 0.057 per year, respectively. Significant differences were observed among RBFDPs from different operators for criteria that included adaptation, color match, marginal adaptation, polishability, surface staining, gingival health, and antagonist wear.
Conclusions
Cantilever lithium disilicate RBFDPs appear to be suitable for short-term restoration. RBFDPs exhibited visible changes after short-term follow-up. However, these changes did not result in failure.
{"title":"A 32-month evaluation of lithium disilicate cantilever resin-bonded fixed dental prostheses to replace a missing maxillary incisor","authors":"Joyce A. Jonker BSc , Gil Tirlet DDS, PhD , Alex Dagba DDS , Solène Marniquet DDS , Marinus Ouwerkerk MSc , Marco S. Cune DDS, PhD , Marco M.M. Gresnigt DMD, PhD","doi":"10.1016/j.prosdent.2023.07.040","DOIUrl":"10.1016/j.prosdent.2023.07.040","url":null,"abstract":"<div><h3>Statement of problem</h3><div>The absence of a tooth in the esthetic zone can cause emotional and social distress. The use of minimally invasive and visually pleasing lithium disilicate resin-bonded fixed dental prostheses (RBFDPs) may be a suitable option for replacing a missing maxillary incisor. However, the available literature on lithium disilicate cantilever RBFDPs is limited.</div></div><div><h3>Purpose</h3><div>This retrospective multicenter study assessed the survival and success rates of lithium disilicate anterior cantilever RBFDPs with an average follow-up period of 3 years up to 9 years.</div></div><div><h3>Material and methods</h3><div>RBFDPs delivered by 3 operators were clinically assessed for survival using a modified United States Public Health Service criteria list. The incidence density was determined for each criterion and operator. The standard error and 95% confidence interval were calculated for each incidence density difference (α=.05 for all analyses).</div></div><div><h3>Results</h3><div>A total of 108 RBFDPs were evaluated after a mean period of 32.45 months, ranging from 14 days to 111 months. None of the restorations exhibited failure, carious lesions, or fractures during the follow-up period. The primary reasons for reduced success rates were inflammation of the surrounding soft tissues and discoloration, with incidence densities of 0.074 and 0.057 per year, respectively. Significant differences were observed among RBFDPs from different operators for criteria that included adaptation, color match, marginal adaptation, polishability, surface staining, gingival health, and antagonist wear.</div></div><div><h3>Conclusions</h3><div>Cantilever lithium disilicate RBFDPs appear to be suitable for short-term restoration. RBFDPs exhibited visible changes after short-term follow-up. However, these changes did not result in failure.</div></div>","PeriodicalId":16866,"journal":{"name":"Journal of Prosthetic Dentistry","volume":"132 5","pages":"Pages 956-963"},"PeriodicalIF":4.3,"publicationDate":"2024-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"10651933","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-11-01DOI: 10.1016/j.prosdent.2024.04.019
Andrew S. Ryser DDS , Jennifer Sabol DDS , Michael Chew DMD , Steven Handel DMD
This dental technique described assists the clinician with determining the maxillary midline and for the maxillary midline to coincide with the facial midline. This is accomplished during the acquisition of a facebow registration which is often utilized during prosthetic rehabilitation.
{"title":"A technique for determining the midline using a facebow","authors":"Andrew S. Ryser DDS , Jennifer Sabol DDS , Michael Chew DMD , Steven Handel DMD","doi":"10.1016/j.prosdent.2024.04.019","DOIUrl":"10.1016/j.prosdent.2024.04.019","url":null,"abstract":"<div><div>This dental technique described assists the clinician with determining the maxillary midline and for the maxillary midline to coincide with the facial midline. This is accomplished during the acquisition of a facebow registration which is often utilized during prosthetic rehabilitation.</div></div>","PeriodicalId":16866,"journal":{"name":"Journal of Prosthetic Dentistry","volume":"132 5","pages":"Pages 871.e1-871.e2"},"PeriodicalIF":4.3,"publicationDate":"2024-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140908087","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}
Pub Date : 2024-11-01DOI: 10.1016/j.prosdent.2024.08.002
Peixi Liao BDS, DScD, Onkamon Budsabong DDS
{"title":"Response to Letter to the Editor regarding, “A method of fabricating a stackable CAD-CAM custom record tray for complete dentures”","authors":"Peixi Liao BDS, DScD, Onkamon Budsabong DDS","doi":"10.1016/j.prosdent.2024.08.002","DOIUrl":"10.1016/j.prosdent.2024.08.002","url":null,"abstract":"","PeriodicalId":16866,"journal":{"name":"Journal of Prosthetic Dentistry","volume":"132 5","pages":"Pages 1093-1094"},"PeriodicalIF":4.3,"publicationDate":"2024-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142108595","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}
Zirconia abutments have become popular as they provide favorable esthetic outcomes. However, studies investigating how abutment material affects abutment screw torque performance and implant conical surface morphological changes in internal conical connection systems are scarce.
Purpose
The purpose of this in vitro study was to investigate the influence of abutment material on abutment removal torque and implant conical surface morphological changes in internal conical connection implant–abutment assemblies of 2 diameters after simulated long-term oral use.
Material and methods
Thirty abutments of 3 materials (1-piece titanium, 1-piece zirconia, zirconia with alloy base) and 2 diameters (regular, narrow) made by the original manufacturer were connected to internal conical connection implants and subjected to a standardized artificial aging process consisting of thermal cycling and mechanical cyclic loading with parameters corresponding to anterior and posterior mastication scenarios simulating long-term oral use. An abutment removal torque test was done before and after aging. Morphological changes in the implant conical contact surface were observed with a scanning electron microscope (SEM). Initial and after-aging torque loss values were calculated and analyzed separately with 1-way ANOVA and Tukey HSD post hoc tests (α=.05).
Results
All specimens survived artificial aging. For initial and after-aging torque loss, the 1-piece zirconia groups showed significantly greater values (P<.001) for both diameters. In the SEM observation, the 1-piece zirconia groups showed distinct widespread surface damage while the other groups exhibited only minor damages.
Conclusions
Regardless of diameter, 1-piece zirconia abutments tend to induce more abutment removal torque loss and implant conical surface morphological changes than those with metal connections, both initially and after simulated long-term oral use. Zirconia abutments with an alloy base performed similarly to 1-piece titanium abutments.
{"title":"Abutment removal torque and implant conical surface morphological changes after standardized artificial aging: An in vitro study","authors":"Zhihao Zhai DDS, PhD , Tamaki Nakano DDS, PhD , Yuming Chen DDS , Shota Watanabe DDS, PhD , Takashi Matsuoka DDS, PhD , Shoichi Ishigaki DDS, PhD","doi":"10.1016/j.prosdent.2022.11.016","DOIUrl":"10.1016/j.prosdent.2022.11.016","url":null,"abstract":"<div><h3>Statement of problem</h3><div><span>Zirconia </span>abutments have become popular as they provide favorable esthetic outcomes. However, studies investigating how abutment material affects abutment screw torque performance and implant conical surface morphological changes in internal conical connection systems are scarce.</div></div><div><h3>Purpose</h3><div>The purpose of this in vitro study was to investigate the influence of abutment material on abutment removal torque and implant conical surface morphological changes in internal conical connection implant–abutment assemblies of 2 diameters after simulated long-term oral use.</div></div><div><h3>Material and methods</h3><div><span><span>Thirty abutments of 3 materials (1-piece titanium, 1-piece zirconia, zirconia with alloy base) and 2 diameters (regular, narrow) made by the original manufacturer were connected to internal conical connection implants and subjected to a standardized artificial aging process consisting of thermal cycling and mechanical cyclic loading with parameters corresponding to anterior and posterior </span>mastication<span> scenarios simulating long-term oral use. An abutment removal torque test was done before and after aging. Morphological changes in the implant conical contact surface were observed with a scanning electron microscope (SEM). Initial and after-aging torque loss values were calculated and analyzed separately with 1-way ANOVA and Tukey HSD </span></span>post hoc tests (α=.05).</div></div><div><h3>Results</h3><div>All specimens survived artificial aging. For initial and after-aging torque loss, the 1-piece zirconia groups showed significantly greater values (<em>P</em><.001) for both diameters. In the SEM observation, the 1-piece zirconia groups showed distinct widespread surface damage while the other groups exhibited only minor damages.</div></div><div><h3>Conclusions</h3><div>Regardless of diameter, 1-piece zirconia abutments tend to induce more abutment removal torque loss and implant conical surface morphological changes than those with metal connections, both initially and after simulated long-term oral use. Zirconia abutments with an alloy base performed similarly to 1-piece titanium abutments.</div></div>","PeriodicalId":16866,"journal":{"name":"Journal of Prosthetic Dentistry","volume":"132 5","pages":"Pages 1005-1013"},"PeriodicalIF":4.3,"publicationDate":"2024-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"10356101","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}
Pub Date : 2024-11-01DOI: 10.1016/j.prosdent.2022.10.010
Yujia Wang BDS, DDS , Mariko Hattori DDS, PhD , Rongguang Liu MBBS, PhD , Yuka I. Sumita DDS, PhD
Statement of problem
Prosthetic rehabilitation with an obturator can help to restore or improve the intelligibility of speech in patients after maxillectomy. The frequency of formants 1 and 2 as well as their ranges were initially reported in patients with maxillary defects in 2002, and the evaluation method that was used is now applied in clinical evaluation. However, the details of formant 3 are not known and warrant investigation because, according to speech science, formant 3 is related to the pharyngeal volume. Clarifying the formant frequency values of formant 3 in patients after maxillectomy would enable prosthodontists to refer to these data when planning treatment and when assessing the outcome of an obturator.
Purpose
The purpose of this clinical study was to determine the acoustic characteristics of formant 3, together with those of formants 1 and 2, by using a digital acoustic analysis during maxillofacial prosthetic treatment. The utility of determining formant 3 in the evaluation of speech in patients after maxillectomy was also evaluated.
Material and methods
Twenty-six male participants after a maxillectomy (mean age, 63 years; range, 20 to 93 years) were included, and the 5 Japanese vowels /a/, /e/, /i/, /o/, and /u/ produced with and without a definitive obturator prosthesis were recorded. The frequencies of the 3 formants were determined, and their ranges were calculated by using a speech analysis system (Computerized Speech Lab CSL 4400). The Wilcoxon signed rank test was used to compare the formants between the 2 use conditions (α=0.05).
Results
Significant differences were found in the frequencies and ranges of all 3 formants between the use conditions. The ranges of all 3 formants produced with the prosthesis were significantly greater than those produced without it.
Conclusions
Based on the findings, both the first 2 formants and the third formant were changed by wearing an obturator prosthesis. Because formant 3 is related to the volume of the pharynx, evaluation of this formant and its range can reflect the effectiveness of the prosthesis to seal the oronasal communication and help reduce hypernasality, suggesting the utility of formant 3 analysis in prosthodontic rehabilitation.
{"title":"Digital acoustic analysis of the first three formant frequencies in patients with a prosthesis after maxillectomy","authors":"Yujia Wang BDS, DDS , Mariko Hattori DDS, PhD , Rongguang Liu MBBS, PhD , Yuka I. Sumita DDS, PhD","doi":"10.1016/j.prosdent.2022.10.010","DOIUrl":"10.1016/j.prosdent.2022.10.010","url":null,"abstract":"<div><h3>Statement of problem</h3><div><span>Prosthetic rehabilitation with an obturator can help to restore or improve the intelligibility of speech in patients after </span>maxillectomy<span><span>. The frequency of formants 1 and 2 as well as their ranges were initially reported in patients with maxillary defects in 2002, and the evaluation method that was used is now applied in clinical evaluation<span>. However, the details of formant 3 are not known and warrant investigation because, according to speech science, formant 3 is related to the pharyngeal volume. Clarifying the formant frequency values of formant 3 in patients after maxillectomy would enable </span></span>prosthodontists to refer to these data when planning treatment and when assessing the outcome of an obturator.</span></div></div><div><h3>Purpose</h3><div>The purpose of this clinical study was to determine the acoustic characteristics of formant 3, together with those of formants 1 and 2, by using a digital acoustic analysis during maxillofacial prosthetic treatment. The utility of determining formant 3 in the evaluation of speech in patients after maxillectomy was also evaluated.</div></div><div><h3>Material and methods</h3><div>Twenty-six male participants after a maxillectomy (mean age, 63 years; range, 20 to 93 years) were included, and the 5 Japanese vowels /a/, /e/, /i/, /o/, and /u/ produced with and without a definitive obturator prosthesis were recorded. The frequencies of the 3 formants were determined, and their ranges were calculated by using a speech analysis system (Computerized Speech Lab CSL 4400). The Wilcoxon signed rank test was used to compare the formants between the 2 use conditions (α=0.05).</div></div><div><h3>Results</h3><div>Significant differences were found in the frequencies and ranges of all 3 formants between the use conditions. The ranges of all 3 formants produced with the prosthesis were significantly greater than those produced without it.</div></div><div><h3>Conclusions</h3><div>Based on the findings, both the first 2 formants and the third formant were changed by wearing an obturator prosthesis. Because formant 3 is related to the volume of the pharynx<span>, evaluation of this formant and its range can reflect the effectiveness of the prosthesis to seal the oronasal communication and help reduce hypernasality<span>, suggesting the utility of formant 3 analysis in prosthodontic rehabilitation.</span></span></div></div>","PeriodicalId":16866,"journal":{"name":"Journal of Prosthetic Dentistry","volume":"132 5","pages":"Pages 1082-1087"},"PeriodicalIF":4.3,"publicationDate":"2024-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"40458907","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}
Pub Date : 2024-11-01DOI: 10.1016/j.prosdent.2022.09.021
Mohammad Jowkar DDS , Farzad Yeganeh DDS , Amirhossein Fathi DDS, MS , Behnaz Ebadian DDS, MS
When surgery is performed to remove aggressive cancer, the extent of the lesion commands the amount of tissue removed. The removal of extensive tissue such as crucial landmarks complicates prosthesis design. This clinical report describes the prosthetic reconstruction of a patient who underwent tumor resection of the upper lip, anterior portion of the nasal cavity, and cartilaginous portion of the nasal septum, as well as subsequent radiation therapy. The prosthetic rehabilitation consisted of magnetic attachments, eyeglasses, and silicone adhesives. The applied technique effectively covered the site of squamous cell carcinoma removal providing natural color and form.
{"title":"Prosthetic reconstruction of a patient with an irradiated rhinectomy and upper lip resection with a maxillofacial prosthesis and removable complete dentures: A clinical report","authors":"Mohammad Jowkar DDS , Farzad Yeganeh DDS , Amirhossein Fathi DDS, MS , Behnaz Ebadian DDS, MS","doi":"10.1016/j.prosdent.2022.09.021","DOIUrl":"10.1016/j.prosdent.2022.09.021","url":null,"abstract":"<div><div>When surgery is performed to remove aggressive cancer, the extent of the lesion commands the amount of tissue removed. The removal of extensive tissue such as crucial landmarks complicates prosthesis design<span>. This clinical report describes the prosthetic reconstruction of a patient who underwent tumor resection of the upper lip, anterior portion of the nasal cavity<span>, and cartilaginous portion of the nasal septum, as well as subsequent radiation therapy. The prosthetic rehabilitation consisted of magnetic attachments, eyeglasses, and silicone adhesives. The applied technique effectively covered the site of squamous cell carcinoma removal providing natural color and form.</span></span></div></div>","PeriodicalId":16866,"journal":{"name":"Journal of Prosthetic Dentistry","volume":"132 5","pages":"Pages 1069.e1-1069.e5"},"PeriodicalIF":4.3,"publicationDate":"2024-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"40506236","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}
Pub Date : 2024-11-01DOI: 10.1016/j.prosdent.2022.09.017
Sara J. Alhossaini BDS , Akram F. Neena BDS, MSc, PhD , Noha O. Issa BDS, MSc, PhD , Hassan M. Abouelkheir BDS, MSc, PhD , Yasmine Y. Gaweesh BDS, MSc, PhD
Statement of problem
Digital imaging and communications in medicine (DICOM) files together with surface scans must be accurately registered in virtual implant planning software programs to match real-life dimensions and ensure correct plan transfer through computer-aided manufactured surgical guides.
Purpose
The purpose of this in vitro study was to evaluate the accuracy of 3 different registration methods of DICOM data with and without metal restorations and a metal artifact reduction (MAR) tool for surface scans.
Material and methods
Thirteen dentate mandibles were assigned to each group of this study (n=39). Baseplate wax was adapted to the bone surfaces of each mandible, and 5 radiopaque markers were attached. A desktop scanner was used to obtain control scans. The groups of metal-free mandibles (MFM) and mandibles with metal restorations (MRM) were scanned to obtain DICOM data without a MAR tool. Additional DICOM data for the MRM were obtained with the MAR tool (MRM-MAR). Point-based registration (PBR), best-fit registration (BFR), and automatic registration (AR) were used to align standard tessellation language (STL) and DICOM data, and 3 data sets were exported. Radiographic markers on each data set were compared with those on the control scan, and positional deviations were calculated and statistically evaluated with 1-way ANOVA followed by multiple pairwise comparisons, independent samples t test, and 2-way ANOVA (α=.05).
Results
Within each group, PBR had the lowest deviation values with statistical significance in the MFM and the MRM-MAR groups (P<.001). AR showed failure in the MRM and the MRM-MAR groups. Statistically significant differences were found on comparing the average deviations among the 3 groups for PBR only (P<.001). No association was found between deviation values and the presence or absence of metal restoration, while a positive association was found with the type of registration method (P<.001).
Conclusions
PBR had the highest accuracy level compared with AR and BFR methods. An increase in the number of calculations resulted in more deviation values. The MAR tool had a positive effect on PBR in mandibles with metal restorations.
问题陈述：医学数字成像和通信（DICOM）文件以及表面扫描必须在虚拟种植规划软件程序中准确注册，以匹配现实生活中的尺寸，并确保通过计算机辅助制造的手术导板进行正确的计划转移。目的：本体外研究的目的是评估带金属修复体和不带金属修复体的 DICOM 数据的 3 种不同注册方法以及表面扫描的金属伪影减少工具（MAR）的准确性：本研究的每组均有13颗有齿下颌骨（n=39）。在每个下颌骨的骨表面涂上基板蜡，并贴上 5 个不透射线的标记。使用台式扫描仪进行对照扫描。对无金属下颌骨（MFM）组和有金属修复体的下颌骨（MRM）组进行扫描，以获得 DICOM 数据，而不使用 MAR 工具。使用 MAR 工具（MRM-MAR）获得 MRM 的其他 DICOM 数据。使用基于点的配准 (PBR)、最佳拟合配准 (BFR) 和自动配准 (AR) 对齐标准细分语言 (STL) 和 DICOM 数据，并导出 3 组数据。将每个数据集上的放射标记与对照扫描上的标记进行比较，计算位置偏差，并通过单因素方差分析、多对比较、独立样本 t 检验和双因素方差分析（α=.05）进行统计评估：在各组中，PBR 的偏差值最低，在 MFM 和 MRM-MAR 组中具有统计学意义（PConclusions：与 AR 和 BFR 方法相比，PBR 的准确度最高。计算次数越多，偏差值越大。MAR工具对金属修复体下颌骨的PBR有积极影响。
{"title":"Accuracy of markerless registration methods of DICOM and STL files used for computerized surgical guides in mandibles with metal restorations: An in vitro study","authors":"Sara J. Alhossaini BDS , Akram F. Neena BDS, MSc, PhD , Noha O. Issa BDS, MSc, PhD , Hassan M. Abouelkheir BDS, MSc, PhD , Yasmine Y. Gaweesh BDS, MSc, PhD","doi":"10.1016/j.prosdent.2022.09.017","DOIUrl":"10.1016/j.prosdent.2022.09.017","url":null,"abstract":"<div><h3>Statement of problem</h3><div>Digital imaging and communications in medicine (DICOM) files together with surface scans must be accurately registered in virtual implant planning software programs to match real-life dimensions and ensure correct plan transfer through computer-aided manufactured surgical guides.</div></div><div><h3>Purpose</h3><div>The purpose of this in vitro study was to evaluate the accuracy of 3 different registration methods of DICOM data with and without metal restorations and a metal artifact reduction (MAR) tool for surface scans.</div></div><div><h3>Material and methods</h3><div><span>Thirteen dentate mandibles were assigned to each group of this study (n=39). Baseplate wax was adapted to the bone surfaces of each mandible, and 5 radiopaque markers were attached. A desktop scanner was used to obtain control scans. The groups of metal-free mandibles (MFM) and mandibles with metal restorations (MRM) were scanned to obtain DICOM data without a MAR tool. Additional DICOM data for the MRM were obtained with the MAR tool (MRM-MAR). Point-based registration (PBR), best-fit registration (BFR), and automatic registration (AR) were used to align standard tessellation language (STL) and DICOM data, and 3 data sets were exported. Radiographic markers on each data set were compared with those on the control scan, and positional deviations were calculated and statistically evaluated with 1-way ANOVA followed by multiple pairwise comparisons, independent samples </span><em>t</em> test, and 2-way ANOVA (α=.05).</div></div><div><h3>Results</h3><div>Within each group, PBR had the lowest deviation values with statistical significance in the MFM and the MRM-MAR groups (<em>P</em><.001). AR showed failure in the MRM and the MRM-MAR groups. Statistically significant differences were found on comparing the average deviations among the 3 groups for PBR only (<em>P</em><.001). No association was found between deviation values and the presence or absence of metal restoration, while a positive association was found with the type of registration method (<em>P</em><.001).</div></div><div><h3>Conclusions</h3><div>PBR had the highest accuracy level compared with AR and BFR methods. An increase in the number of calculations resulted in more deviation values. The MAR tool had a positive effect on PBR in mandibles with metal restorations.</div></div>","PeriodicalId":16866,"journal":{"name":"Journal of Prosthetic Dentistry","volume":"132 5","pages":"Pages 986-993"},"PeriodicalIF":4.3,"publicationDate":"2024-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"40701171","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}
Pub Date : 2024-11-01DOI: 10.1016/j.prosdent.2024.04.015
Peixi Liao BDS, DScD , Onkamon Budsabong DDS
Digital complete denture fabrication has advanced with the integration of computer-aided design and computer-aided manufacturing (CAD-CAM), intraoral scanning, and 3-dimensional printing. A method of fabricating a stackable CAD-CAM custom record tray for complete dentures is introduced. The method combines a custom tray, record base, and occlusion rim in a single piece.
{"title":"A method of fabricating a stackable CAD-CAM custom record tray for complete dentures","authors":"Peixi Liao BDS, DScD , Onkamon Budsabong DDS","doi":"10.1016/j.prosdent.2024.04.015","DOIUrl":"10.1016/j.prosdent.2024.04.015","url":null,"abstract":"<div><div>Digital complete denture fabrication has advanced with the integration of computer-aided design and computer-aided manufacturing (CAD-CAM), intraoral scanning, and 3-dimensional printing. A method of fabricating a stackable CAD-CAM custom record tray for complete dentures is introduced. The method combines a custom tray, record base, and occlusion rim in a single piece.</div></div>","PeriodicalId":16866,"journal":{"name":"Journal of Prosthetic Dentistry","volume":"132 5","pages":"Pages 872-878"},"PeriodicalIF":4.3,"publicationDate":"2024-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140860445","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}
Pub Date : 2024-11-01DOI: 10.1016/j.prosdent.2024.07.046
Huicong Zhang MDS, Wang Wang DMD
{"title":"Letter to the Editor regarding \"A method of fabricating a stackable CAD-CAM custom record tray for complete dentures\" by Liao and Budsabong","authors":"Huicong Zhang MDS, Wang Wang DMD","doi":"10.1016/j.prosdent.2024.07.046","DOIUrl":"10.1016/j.prosdent.2024.07.046","url":null,"abstract":"","PeriodicalId":16866,"journal":{"name":"Journal of Prosthetic Dentistry","volume":"132 5","pages":"Pages 1090-1092"},"PeriodicalIF":4.3,"publicationDate":"2024-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142289768","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}
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