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9 pages, 820 KiB

Open AccessArticle

Changes and Remodeling of Intersegmental Interferences following Bilateral Sagittal Split Ramus Osteotomy in Patients with Mandibular Prognathism

by Min-A Jeon, George K. Sándor, Edward Chengchuan Ko and Yong-Deok Kim

Appl. Sci. 2022, 12(4), 1892; https://doi.org/10.3390/app12041892 - 11 Feb 2022

Viewed by 1593

Abstract

Purpose: This study aimed to measure the amount of change in the mandibular angle, intergonial width, and ramus angulation due to intersegmental interference and changes in condyle position after mandibular bilateral sagittal split ramus osteotomy (BSSRO) in patients with mandibular prognathism and to [...] Read more.

Purpose: This study aimed to measure the amount of change in the mandibular angle, intergonial width, and ramus angulation due to intersegmental interference and changes in condyle position after mandibular bilateral sagittal split ramus osteotomy (BSSRO) in patients with mandibular prognathism and to evaluate the correlation between them. Materials and Methods: A total of 32 patients who underwent mandibular setback using the BSSRO of the mandible to manage skeletal prognathism during the years 2018 to 2020 at the Department of Oral and Maxillofacial Surgery, Pusan National University were followed both clinically and with cone beam computed tomography (CBCT) for at least one year. Those who were also treated with genioplasty or other orthognathic surgery were excluded from the study. The mandibular angle (gonial angle: Ar–Go–Me), intergonial width (Go–Go), and total angle (sum of left and right proximal segmental angle) were recorded. Changes in the ramus were compared and analyzed before surgery (T1), immediately after surgery (T2), and one year following surgery (T3). Results: The mandibular angle increased by an average of 0.14 degrees immediately after surgery (T2–T1) and increased by 0.97 degrees at 12 months postoperatively (T3–T2). No correlation was observed with the amount of change in each group relative to the amount of mandibular setback. The mandibular width decreased by 0.01 mm on average immediately after surgery (T2–T1), and by 4.2 mm on average at 12 months after surgery (T3–T2). The angle of the mesial fragment of the mandible increased by 1.04 degrees immediately after surgery (T2–T1), compared to the preoperative state. It decreased by 0.86 degrees at 12 months postoperatively (T3–T2). Conclusion: The increase in the mandibular angle from immediately after surgery to 12 months after BSSRO reflects the counterclockwise rotational tendency to prevent opening restriction when intentionally selecting the condylar position. The decrease in the intergonial width immediately after surgery is thought to be due to the effect of internal trimming to minimize the bone interference between the outer surface of the distal bone fragment and the inner surface of the mesial fragment, and the decrease 1 year after surgery can be considered to be due to bone remodeling. Interosseous interference during mandibular setback osteotomy does not necessarily cause an increase in the width of the mandibular angle after surgery. Full article

(This article belongs to the Special Issue Application of CAD/CAM and 3D Printing Technologies in Dentistry II)

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14 pages, 22424 KiB

Open AccessArticle

Accuracy of 3D-Printed Occlusal Devices of Different Volumes Using a Digital Light Processing Printer

by Sven Reich, Saskia Berndt, Christina Kühne and Hannah Herstell

Appl. Sci. 2022, 12(3), 1576; https://doi.org/10.3390/app12031576 - 1 Feb 2022

Cited by 6 | Viewed by 5359

Abstract

(1) Background: This in-vitro study was designed to investigate the accuracy of CAD/CAM fabricated occlusal devices with different heights and volumes. (2) Methods: Based on an intraoral scan, an occlusal device with a vertical bite elevation of 2.5 mm and 4.5 mm was [...] Read more.

(1) Background: This in-vitro study was designed to investigate the accuracy of CAD/CAM fabricated occlusal devices with different heights and volumes. (2) Methods: Based on an intraoral scan, an occlusal device with a vertical bite elevation of 2.5 mm and 4.5 mm was digitally designed and 3D printed 10 times. The fabricated occlusal devices were digitized by an industrial structured light scanner (ILS) and provided in stl-format as test objects. The test objects were superimposed with the design dataset as reference to evaluate the accuracy of complete surfaces ([2.5_TOTAL] and [4.5_TOTAL]) with respect to their internal surfaces ([2.5_INTERNAL] and [4.5_INTERNAL]). The mean trueness and precision were calculated based on absolute mean deviation. Absolute and relative volume differences between reference and test were computed. Statistical significances were analyzed performing the Wilcoxon test (α = 0.05). (3) Results: As absolute mean deviation trueness values were obtained: 59 ± 5 µm for [2.5_INTERNAL], 98 ± 9 µm for [4.5_INTERNAL], 68 ± 1 µm for [2.5_TOTAL] and 90 ± 10 µm for [4.5_TOTAL]. The precision applying absolute mean deviation was 14 ± 8 µm for [2.5_INTERNAL], 22 ± 11 µm for [4.5_INTERNAL], 19 ± 10 µm for [2.5_TOTAL] and 26 ± 13 µm for [4.5_TOTAL]. The mean trueness and precision values differed significantly. Volume differences of 2.11% for [4.5_TOTAL] and of 2.35% for [2.5_TOTAL] in comparison to their reference file were evaluated. (4) Conclusions: Printed occlusal devices with minor height and volume were more accurate. Both types of devices exhibited results that were comparable to the literature. Full article

(This article belongs to the Special Issue Application of CAD/CAM and 3D Printing Technologies in Dentistry II)

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12 pages, 2133 KiB

Open AccessArticle

Which Three-Dimensional Printing Technology Can Replace Conventional Manual Method of Manufacturing Oral Appliance? A Preliminary Comparative Study of Physical and Mechanical Properties

by Hyo-Jin Kim, Seung-Weon Lim, Mi-Kyung Lee, Sung Won Ju, Suk-Hee Park, Jin-Soo Ahn and Kyung-Gyun Hwang

Appl. Sci. 2022, 12(1), 130; https://doi.org/10.3390/app12010130 - 23 Dec 2021

Cited by 4 | Viewed by 3339

Abstract

Three-dimensional printing technology is widely being adopted in the manufacturing of oral appliances. The purpose of this study was to determine the most suitable method of manufacturing oral appliances by comparing the physical and mechanical properties of various 3D printing methods with the [...] Read more.

Three-dimensional printing technology is widely being adopted in the manufacturing of oral appliances. The purpose of this study was to determine the most suitable method of manufacturing oral appliances by comparing the physical and mechanical properties of various 3D printing methods with the conventional method. Experimental groups consisted of six 3D-printed specimens via FDM, two polyjets, SLS, SLA, and DLP, and the milling methods. The control group consisted of an acrylic resin specimen made by the conventional manual method. The water absorption and solubility, color stability, flexural strength, and surface hardness were tested and statistically analyzed. The FDM, SLS, and DLP methods exhibited comparable water absorption and solubility with the control group, and only the SLA method exhibited significantly higher water solubility than the control group. In terms of the color stability, only the milling method met the requirements of the allowable clinical range. The FDM, SLA, and DLP methods exhibited comparable flexural strength with the control group. The surface hardness of the PJ-2, DLP, and milling methods was acceptable for replacing conventional manual method. Therefore, the most suitable method of manufacturing oral appliances among the experimental groups was the DLP method in terms of its water absorption and solubility, flexural strength, and surface hardness. Full article

(This article belongs to the Special Issue Application of CAD/CAM and 3D Printing Technologies in Dentistry II)

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9 pages, 6973 KiB

Open AccessArticle

Postoperative Stability of Patients Undergoing Orthognathic Surgery with Orthodontic Treatment Using Clear Aligners: A Preliminary Study

by Chiho Moon, George K. Sándor, Edward Chengchuan Ko and Yong-Deok Kim

Appl. Sci. 2021, 11(23), 11216; https://doi.org/10.3390/app112311216 - 25 Nov 2021

Cited by 5 | Viewed by 2593

Abstract

Backgrond: Until now, there have been many studies on the postoperative stability of orthognathic patients treated with traditional fixed orthodontic appliances. Recently, the use of clear aligners as orthodontic appliances has increased in orthodontic treatment for aesthetic and patient convenience. The aim of [...] Read more.

Backgrond: Until now, there have been many studies on the postoperative stability of orthognathic patients treated with traditional fixed orthodontic appliances. Recently, the use of clear aligners as orthodontic appliances has increased in orthodontic treatment for aesthetic and patient convenience. The aim of this preliminary study was to investigate the stability and characteristics of patients undergoing orthognathic surgery using clear aligners. Patients and Methods: This study was performed on patients who underwent orthognathic surgery by one surgeon at Pusan National University Dental Hospital from April 2017 to August 2021. A comparative study was conducted on five patients treated with clear aligners during orthodontic treatment and ten patients treated with traditional fixed appliances as a control group. Postoperative skeletal changes and recurrence were evaluated by cone beam computed tomography and lateral cephalometric radiographs taken two days postoperatively and six months postoperatively. Several measurement variables were used to confirm the presence or absence of recurrence, preoperative and postoperative orthodontic treatment period, and the number of extracted teeth. Results: Postoperative stability for six months after surgery was not significantly different between the clear aligner group and the traditional fixed appliance group. The preoperative orthodontic treatment period was also shorter in the clear aligner group, and the number of extracted premolar teeth and impacted teeth were also fewer in the clear aligner group, but there was no significant difference. Conclusions: Orthodontic treatment using clear aligners continues to develop, and it is believed that there is no limit to what can be accomplished during orthodontic surgery accompanied by clear aligners. Full article

(This article belongs to the Special Issue Application of CAD/CAM and 3D Printing Technologies in Dentistry II)

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9 pages, 2548 KiB

Open AccessArticle

Mechanical Property Comparison of Ni–Cr–Mo Alloys Fabricated via One Conventional and Two New Digital Manufacturing Techniques

by Kyung-Ran Yang, Takao Hanawa, Tae-Yub Kwon, Bong-Ki Min and Min-Ho Hong

Appl. Sci. 2021, 11(19), 9308; https://doi.org/10.3390/app11199308 - 7 Oct 2021

Cited by 4 | Viewed by 2504

Abstract

This study compared the microstructures and mechanical properties of nickel–chromium–molybdenum (Ni–Cr–Mo) alloys prepared from a single alloy with an identical composition using two new digital processes (selective laser melting (SLM) and soft metal milling (SMM)) and conventional lost-wax casting (LWC). Disc specimens were [...] Read more.

This study compared the microstructures and mechanical properties of nickel–chromium–molybdenum (Ni–Cr–Mo) alloys prepared from a single alloy with an identical composition using two new digital processes (selective laser melting (SLM) and soft metal milling (SMM)) and conventional lost-wax casting (LWC). Disc specimens were used to study the microstructures via various analytical methods, while dumbbell-shaped specimens were subjected to tension to determine the mechanical properties (n = 6). The SLM and SMM alloys showed a higher number of large and small pores, respectively, than the LWC alloy. A face-centered cubic (γ)-phased matrix was indexed for all three resultant alloys. The SLM and SMM alloys also showed more homogeneously distributed elements and finer grains (in particular, ultrafine grains in the SLM alloy) when compared to the LWC alloy. Meanwhile, the LWC alloy showed a statistically higher yield strength than the other two alloys (p < 0.001). Notwithstanding, all three resultant Ni–Cr–Mo alloys satisfied the ISO 22674 standard criteria for type 5 materials (yield strength: >500 MPa; percentage elongation: >2%; and elastic modulus: >150 GPa). Full article

(This article belongs to the Special Issue Application of CAD/CAM and 3D Printing Technologies in Dentistry II)

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19 pages, 5365 KiB

Open AccessArticle

Influence of Conventional, CAD-CAM, and 3D Printing Fabrication Techniques on the Marginal Integrity and Surface Roughness and Wear of Interim Crowns

by Nada Aldahian, Rawaiz Khan, Mohammed Mustafa, Fahim Vohra and Ali Alrahlah

Appl. Sci. 2021, 11(19), 8964; https://doi.org/10.3390/app11198964 - 26 Sep 2021

Cited by 24 | Viewed by 4304

Abstract

The aim is to assess the influence of fabrication techniques—conventional (CN), CAD-CAM (CC), and 3D printing (3D)—on the marginal fit, adaptation, surface roughness, and wear of interim restorations of crowns. Thirty interim crowns were fabricated using CN, CC, and 3D techniques. Sixty discs [...] Read more.

The aim is to assess the influence of fabrication techniques—conventional (CN), CAD-CAM (CC), and 3D printing (3D)—on the marginal fit, adaptation, surface roughness, and wear of interim restorations of crowns. Thirty interim crowns were fabricated using CN, CC, and 3D techniques. Sixty discs were fabricated to evaluate surface wear and surface roughness properties, with 10 disc samples in each group (n = 10). Internal adaptation and marginal integrity of interim crowns were analyzed with micro CT to detect microgaps at selected points. Average surface micro-roughness (Ra) was calculated in micrometers (μm) using an optical non-contact surface microscope under cyclic loading. Surface wear was evaluated by surface area measurements (mm³) using a micro CT. Analysis of variance (ANOVA) and Tukey’s post hoc comparison tests with Pearson correlation were performed for data analysis. The highest adaptation means were for CN (269.94 ± 64 μm), and the lowest mean value was observed for 3D (197.82 ± 11.72 μm) crowns. CN and CC specimens showed comparable adaptation (p > 0.05), which were significantly higher (p < 0.05) than 3D crowns. CN crowns showed significantly higher marginal misfit compared to 3D (p < 0.05) and CC (p < 0.05) crowns. The highest mean surface roughness was observed in the 3D crowns (5.61 ± 0.33 µm), whereas the lowest was found in CC crowns (3.28 ± 0.34 µm). Better restoration Ra was observed using the CC method followed by CN. CN had the highest wear (17.79 ± 2.78 mm³), and the lowest wear was observed in the 3D (10.81 ± 2.00 mm³) specimen. Low surface wear was observed using 3D printing, followed by CN and CC techniques. The printed specimen showed comparable outcomes to CAD-CAM restoration; however, they were better than CN restoration. A positive correlation between adaptation and surface roughness was observed, indicating an effect of the fabrication technique on material physical property. Full article

(This article belongs to the Special Issue Application of CAD/CAM and 3D Printing Technologies in Dentistry II)

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14 pages, 2835 KiB

Open AccessArticle

Effects of Simulated Gastric Acid Exposure on Surface Topography, Mechanical and Optical Features of Commercial CAD/CAM Ceramic Blocks

by Ioana Ligia Pîrvulescu, Daniel Pop, Elena-Alina Moacă, Ciprian-Valentin Mihali, Codruța Ille and Anca Jivănescu

Appl. Sci. 2021, 11(18), 8703; https://doi.org/10.3390/app11188703 - 18 Sep 2021

Cited by 6 | Viewed by 2850

Abstract

Gastric acid exposure produces tooth structure demineralization and dental ceramic degradation. The most affected patients are those who suffer from gastroesophageal reflux disease, bulimia nervosa, and pregnant women with prolonged severe nausea. In order to protect this kind of patient, the purpose of [...] Read more.

Gastric acid exposure produces tooth structure demineralization and dental ceramic degradation. The most affected patients are those who suffer from gastroesophageal reflux disease, bulimia nervosa, and pregnant women with prolonged severe nausea. In order to protect this kind of patient, the purpose of this study was to determine whether simulated gastric acid exposure leads to microstructural changes in surface topography, hardness, color changes, and translucency of some ceramic materials, which are already on the market. Forty disks (Triluxe Forte, Cerasmart, Enamic and Empress CAD) were analyzed before and after immersion in simulated gastric acid juice, in terms of microhardness, surface roughness, translucency, and surface morphology using scanning electron microscopy. Color change was assessed by using a spectrophotometer based on CIELab parameters and the results showed that, after exposure, ∆E_ab remained under the threshold of acceptability and perceptibility. In terms of microhardness, Cerasmart is the only material that did not undergo changes after immersion. SEM images illustrated observable changes surface topography after acid exposure for all the tested materials. In conclusion, Triluxe Forte suffered the most important changes after simulated gastric acid juice exposure, and Cerasmart proved to be the least affected material. Full article

(This article belongs to the Special Issue Application of CAD/CAM and 3D Printing Technologies in Dentistry II)

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16 pages, 3902 KiB

Open AccessArticle

Accuracy of Implant Position Reproduction According to Exposed Length of the Scan Body during Optical Scanning: An In Vitro Study

by Na-Eun Nam, Seung-Ho Shin, Jung-Hwa Lim, Bora Lee, June-Sung Shim and Jong-Eun Kim

Appl. Sci. 2021, 11(4), 1689; https://doi.org/10.3390/app11041689 - 13 Feb 2021

Cited by 5 | Viewed by 3169

Abstract

Accuracy of implant position reproduction according to various types of scanners, implant placement depths, and tooth positions are unknown. The purpose of this study was to compare the accuracy of implant position reproduction for differences in the exposed length of the implant scan [...] Read more.

Accuracy of implant position reproduction according to various types of scanners, implant placement depths, and tooth positions are unknown. The purpose of this study was to compare the accuracy of implant position reproduction for differences in the exposed length of the implant scan body according to scanner type and tooth position. Implants were placed at the positions of the lateral incisor, first premolar, and first molar in the study model at the bone level and submerged 1.5 mm, 3.0 mm, 4.5 mm, and 6.0 mm. The completed models were scanned with one type of tabletop scanner and three types of intraoral scanners (TRIOS 3, i500, and CS3600). A matching process was performed for all scan data to superimpose abutment library data on the scan body, and the root mean square errors were analyzed in three dimensions to evaluate the position reproducibility of the replaced abutment library. In the trueness analysis, the error increased rapidly for an implant placement depth of 4.5 mm, and was largest for a submersion of 6.0 mm. The precision analysis confirmed that the error increased for depths of at least 3.0 mm. The analysis by position identified that the accuracy was lowest for an implant placed at the position of the lateral incisor. These findings indicate that special care is required when making an impression of a deep implant with an optical scanner. Full article

(This article belongs to the Special Issue Application of CAD/CAM and 3D Printing Technologies in Dentistry II)

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16 pages, 2816 KiB

Open AccessArticle

Influence of Edentulous Conditions on Intraoral Scanning Accuracy of Virtual Interocclusal Record in Quadrant Scan

by Ye-Chan Lee, Jong-Eun Kim, Na-Eun Nam, Seung-Ho Shin, Jung-Hwa Lim, Keun-Woo Lee and June-Sung Shim

Appl. Sci. 2021, 11(4), 1489; https://doi.org/10.3390/app11041489 - 6 Feb 2021

Cited by 11 | Viewed by 2711

Abstract

Reproduction of the exact interocclusal relationship using digital workflow is crucial for precise fabrication of accurate prostheses. Intraoral scanner is known to be valid for the measurement of quadrants, however, the role of missing area in the quadrant scan on the virtual interocclusal [...] Read more.

Reproduction of the exact interocclusal relationship using digital workflow is crucial for precise fabrication of accurate prostheses. Intraoral scanner is known to be valid for the measurement of quadrants, however, the role of missing area in the quadrant scan on the virtual interocclusal record (VIR) is uncertain. This study aimed to evaluate the accuracy of VIR in quadrant scans using an intraoral scanner (IOS) under four different edentulous conditions. Eight scans per group were obtained using a laboratory scanner and three IOSs (Trios3, CS3600, i500). Based on trueness and precision, Trios3 had the best results, followed by CS3600 and i500. The trueness and precision were affected by edentulous conditions. The three IOSs showed deviation in the posterior region during assessment of VIR for the missing area with posterior support. CS3600 and i500 showed deviation in the short-span edentulous area without support. In extended edentulous condition without support, Trios3 showed overclosure, while i500 showed an angular deviation. In some groups scanned with Trios3 and i500, the tilting effect was observed. Based on the edentulous condition and type of IOS used, local or general deviations in occlusion were seen. The accuracy of VIR was dependent on accurate scan data. Thus, registration of the occlusal relationship in an edentulous area with more than two missing teeth using IOSs may be clinically more inaccurate than that with a laboratory scanner. Full article

(This article belongs to the Special Issue Application of CAD/CAM and 3D Printing Technologies in Dentistry II)

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13 pages, 3161 KiB

Open AccessArticle

Marginal and Internal Fit of Ceramic Prostheses Fabricated from Different Chairside CAD/CAM Systems: An In Vitro Study

by Keunbada Son and Kyu-Bok Lee

Appl. Sci. 2021, 11(2), 857; https://doi.org/10.3390/app11020857 - 18 Jan 2021

Cited by 7 | Viewed by 3232

Abstract

The purpose of this in vitro study was to evaluate marginal and internal fits of ceramic crowns fabricated with chairside computer-aided design and manufacturing (CAD/CAM) systems. An experimental model based on ISO 12836:2015 was digitally scanned with different intraoral scanners (Omnicam (CEREC), EZIS [...] Read more.

The purpose of this in vitro study was to evaluate marginal and internal fits of ceramic crowns fabricated with chairside computer-aided design and manufacturing (CAD/CAM) systems. An experimental model based on ISO 12836:2015 was digitally scanned with different intraoral scanners (Omnicam (CEREC), EZIS PO (DDS), and CS3500 (Carestream)). Ceramic crowns were fabricated using the CAD/CAM process recommended by each system (CEREC, EZIS, and Carestream systems; N = 15). The 3-dimensional (3D) marginal and internal fit of each ceramic crown was measured using a 3D inspection software (Geomagic control X). Differences among the systems and various measurements were evaluated using the Kruskal–Wallis test. Statistically significant differences were validated using pairwise comparisons (α = 0.05). Occlusal gaps in the CEREC, EZIS, and Carestream groups were 113.0, 161.3, and 438.2 µm, respectively (p < 0.001). The axial gaps were 83.4, 78.0, and 107.9 µm, respectively. The marginal gaps were 77.8, 99.3, and 60.6 µm, respectively, and the whole gaps were 85.9, 107.3, and 214.0 µm, respectively. Significant differences were observed with the EZIS system compared with the other two systems in terms of the marginal gap sizes. The CEREC system showed no significant differences among the four measured regions. However, the EZIS and Carestream systems did show a statistically significant difference (p < 0.05). All three systems were judged to be capable of fabricating clinically acceptable prostheses, because the marginal gap, which is the most important factor in the marginal fit of prostheses, was recorded to be below 100 µm in all three systems. Full article

(This article belongs to the Special Issue Application of CAD/CAM and 3D Printing Technologies in Dentistry II)

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14 pages, 10927 KiB

Open AccessTechnical Note

Digital Denture Fabrication: A Technical Note

by Shavkat Dusmukhamedov, Chu-Nui Lee, Seung-Mi Jeong and Byung-Ho Choi

Appl. Sci. 2021, 11(17), 8093; https://doi.org/10.3390/app11178093 - 31 Aug 2021

Cited by 9 | Viewed by 7378

Abstract

Fabricating a complete denture in a conventional manner may be complicated and difficult. The purpose of this article was to describe the benefits of a fully digital workflow and fabrication procedure of complete dentures based on digital impressions of edentulous jaws. The digital [...] Read more.

Fabricating a complete denture in a conventional manner may be complicated and difficult. The purpose of this article was to describe the benefits of a fully digital workflow and fabrication procedure of complete dentures based on digital impressions of edentulous jaws. The digital data for the workflow were acquired using an intraoral scanner and were then used to design the denture base and teeth. The resulting data were exported to a 3D printer or a milling machine for denture fabrication. Full article

(This article belongs to the Special Issue Application of CAD/CAM and 3D Printing Technologies in Dentistry II)

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5 pages, 3623 KiB

Open AccessTechnical Note

Fabrication of Metal-Reinforced Complete Dentures Using the CAD-CAM Technique

by Xing-Yu Piao, June-Sung Shim and Ji-Man Park

Appl. Sci. 2021, 11(16), 7369; https://doi.org/10.3390/app11167369 - 11 Aug 2021

Cited by 3 | Viewed by 4035

Abstract

The digital manufacture of complete dentures would greatly simplify the workflow; however, the metal-reinforced complete dentures production method has not been well established. This article describes a technique of fabricating metal-reinforced complete dentures in a milling machine using the geometry guide, a negative [...] Read more.

The digital manufacture of complete dentures would greatly simplify the workflow; however, the metal-reinforced complete dentures production method has not been well established. This article describes a technique of fabricating metal-reinforced complete dentures in a milling machine using the geometry guide, a negative impression of the occlusal surface of the metal-reinforced complete denture designed using the computer-aided design software. The geometry guide supports and stabilizes the artificial teeth and metal framework in the correct position in the surrounding resin. Fabrication of metal-reinforced dental prosthesis using the digital technique is possible with this method. Full article

(This article belongs to the Special Issue Application of CAD/CAM and 3D Printing Technologies in Dentistry II)

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7 pages, 3246 KiB

Open AccessTechnical Note

Restorative Space Analysis by Jaw Motion Tracking Using a Template in Completely Edentulous Patients

by Chol-Gwan Han, Young-Bum Park, June-Sung Shim and Jong-Eun Kim

Appl. Sci. 2021, 11(9), 3933; https://doi.org/10.3390/app11093933 - 27 Apr 2021

Cited by 2 | Viewed by 2299

Abstract

Improvements in computer-aided design/computer-aided manufacturing technologies have led to multiple attempts being made to simplify and improve the workflow of prosthesis fabrication for completely edentulous patients. However, most attempts still involve the conventional methods of impression-making and recording the maxillomandibular relationships using alginate, [...] Read more.

Improvements in computer-aided design/computer-aided manufacturing technologies have led to multiple attempts being made to simplify and improve the workflow of prosthesis fabrication for completely edentulous patients. However, most attempts still involve the conventional methods of impression-making and recording the maxillomandibular relationships using alginate, rubber impression materials, and wax materials. In the case of a completely edentulous arch, the presence of movable tissues and the absence of stable landmarks make it difficult to perform direct digitization using an intraoral scanner and to digitally determine the vertical dimension. In the alternative technique described herein, data are obtained by scanning a template such as the patient’s existing old dentures and jaw movement data using target materials and an optical scanner, and an appropriate maxillomandibular relationship that has the desired restorative space is determined on the basis of the obtained trajectory of mandibular movements while opening and closing the mouth. After designing dentures on the basis of the newly established maxillomandibular relationships and performing a try-in process, the final dentures can be manufactured. This alternative technique can reduce the need for multiple visits and complex procedures, improving the workflow for fabricating prostheses with the correct maxillomandibular relationships for individual patients. Full article

(This article belongs to the Special Issue Application of CAD/CAM and 3D Printing Technologies in Dentistry II)

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