Three-dimensional dental measurements: An alternative to plaster models

2010 ◽  
Vol 137 (2) ◽  
pp. 259-265 ◽  
Author(s):  
Hend Mohammed El-Zanaty ◽  
Amr Ragab El-Beialy ◽  
Amr Mohammed Abou El-Ezz ◽  
Khaled Hazem Attia ◽  
Ahmed Ragab El-Bialy ◽  
...  
Keyword(s):  
Three Dimensional ◽  
Dental Measurements ◽  
Plaster Models

Three-Dimensional Computerized Anthropometry of the Nose: Landmark Representation Compared to Surface Analysis

2007 ◽  
Vol 44 (3) ◽  
pp. 278-285 ◽  
Author(s):  
Virgilio F. Ferrario ◽  
Fabrizio Mian ◽  
Redento Peretta ◽  
Riccardo Rosati ◽  
Chiarella Sforza
Keyword(s):  
Three Dimensional ◽  
Digital Data ◽  
Limits Of Agreement ◽  
B Splines ◽  
Surface Areas ◽  
Using Data ◽  
Difference Volume ◽  
T Values ◽  
Plaster Models ◽  
Plaster Casts

Objective: To compare three-dimensional nasal measurements directly made on subjects to those made on plaster casts, and nasal dimensions obtained with a surface-based approach to values obtained with a landmark representation. Methods: Soft-tissue nasal landmarks were directly digitized on 20 healthy adults. Stone casts of their noses were digitized and mathematically reconstructed using nonuniform rational B-splines (NURBS) curves. Linear distances, angles, volumes and surface areas were computed using facial landmarks and NURBS-reconstructed models (surface-based approach). Results: Measurements on the stone casts were somewhat smaller than values obtained directly from subjects (differences between −0.05 and −1.58 mm). Dahlberg's statistic ranged between 0.73 and 1.47 mm. Significant (p < .05) t values were found for 4 of 15 measurements. The surface-based approach gave values 3.5 (volumes) and 2.1 (surface area) times larger than those computed with the landmark-based method. The two values were significantly related (volume, r = 0.881; surface, r = 0.924; p < .001), the resulting equations estimated actual values well (mean difference, volume −0.01 mm3, SD 1.47, area 0.05 cm2, SD 1.44); limits of agreement between −2.89 and 2.87 mm3 (volume); −2.88 and 2.78 cm2 (area). Conclusions: Considering the characteristics of the two methods, and for practical purposes, nasal distances and angles obtained on plaster models were comparable to digital data obtained directly from subjects. Surface areas and volumes were best obtained using a surface-based approach, but could be estimated using data provided by the landmark representation.

scholarly journals Tooth-size discrepancy: A comparison between manual and digital methods

2014 ◽  
Vol 19 (4) ◽  
pp. 107-113 ◽  
Author(s):  
Gabriele Dória Cabral Correia ◽  
Fernando Antonio Lima Habib ◽  
Carlos Jorge Vogel
Keyword(s):  
Three Dimensional ◽  
Diagnostic Tools ◽  
Tooth Size ◽  
Digital Models ◽  
Linear Measurements ◽  
Length Discrepancy ◽  
Technological Advances ◽  
Size Discrepancy ◽  
Digital Methods ◽  
Plaster Models

INTRODUCTION: Technological advances in Dentistry have emerged primarily in the area of diagnostic tools. One example is the 3D scanner, which can transform plaster models into three-dimensional digital models. OBJECTIVE: This study aimed to assess the reliability of tooth size-arch length discrepancy analysis measurements performed on three-dimensional digital models, and compare these measurements with those obtained from plaster models. MATERIAL AND METHODS: To this end, plaster models of lower dental arches and their corresponding three-dimensional digital models acquired with a 3Shape R700T scanner were used. All of them had lower permanent dentition. Four different tooth size-arch length discrepancy calculations were performed on each model, two of which by manual methods using calipers and brass wire, and two by digital methods using linear measurements and parabolas. RESULTS: Data were statistically assessed using Friedman test and no statistically significant differences were found between the two methods (P > 0.05), except for values found by the linear digital method which revealed a slight, non-significant statistical difference. CONCLUSIONS: Based on the results, it is reasonable to assert that any of these resources used by orthodontists to clinically assess tooth size-arch length discrepancy can be considered reliable.

scholarly journals Accuracy of three-dimensional dental resin models created by fused deposition modeling, stereolithography, and Polyjet prototype technologies: A comparative study

2018 ◽  
Vol 88 (3) ◽  
pp. 363-369 ◽  
Author(s):  
Raymund E. Rebong ◽  
Kelton T. Stewart ◽  
Achint Utreja ◽  
Ahmed A. Ghoneima
Keyword(s):  
Fused Deposition Modeling ◽  
Three Dimensional ◽  
Vertical Plane ◽  
Physical Models ◽  
Dental Resin ◽  
Fused Deposition ◽  
Deposition Modeling ◽  
School Of Dentistry ◽  
Plaster Models ◽  
Plaster Casts

ABSTRACT Objectives: The aim of this study was to assess the dimensional accuracy of fused deposition modeling (FDM)–, Polyjet-, and stereolithography (SLA)–produced models by comparing them to traditional plaster casts. Materials and A total of 12 maxillary and mandibular posttreatment orthodontic plaster casts were selected from the archives of the Orthodontic Department at the Indiana University School of Dentistry. Plaster models were scanned, saved as stereolithography files, and printed as physical models using three different three-dimensional (3D) printers: Makerbot Replicator (FDM), 3D Systems SLA 6000 (SLA), and Objet Eden500V (Polyjet). A digital caliper was used to obtain measurements on the original plaster models as well as on the printed resin models.Methods: Results: Comparison between the 3D printed models and the plaster casts showed no statistically significant differences in most of the parameters. However, FDM was significantly higher on average than were plaster casts in maxillary left mixed plane (MxL-MP) and mandibular intermolar width (Md-IMW). Polyjet was significantly higher on average than were plaster casts in maxillary intercanine width (Mx-ICW), mandibular intercanine width (Md-ICW), and mandibular left mixed plane (MdL-MP). Polyjet was significantly lower on average than were plaster casts in maxillary right vertical plane (MxR-vertical), maxillary left vertical plane (MxL-vertical), mandibular right anteroposterior plane (MdR-AP), mandibular right vertical plane (MdR-vertical), and mandibular left vertical plane (MdL-vertical). SLA was significantly higher on average than were plaster casts in MxL-MP, Md-ICW, and overbite. SLA was significantly lower on average than were plaster casts in MdR-vertical and MdL-vertical. Conclusions: Dental models reconstructed by FDM technology had the fewest dimensional measurement differences compared to plaster models.

scholarly journals Comparative Study of Concordance of Digital Models, Plaster Models, and 3D Printed Filament Models with Clinical Measurements in Children

2020 ◽  
pp. 1-11
Author(s):  
Hugo Ricardo ROSIN
Keyword(s):  
Intraclass Correlation ◽  
Reference Method ◽  
Mixed Dentition ◽  
Digital Models ◽  
Dental Measurements ◽  
Permanent Molars ◽  
3D Printed ◽  
Clinical Measurements ◽  
Plaster Models ◽  
Trios Scanner

Objective: The present study aimed to evaluate, in pediatric patients, the concordance of intraoral scanner for dental measurements, comparing the measurements obtained clinically with digital models, 3D printed filament models, and conventional plaster models. Materials and Methods: For this study, 31 patients with mixed dentition were selected, with at least the upper central incisors and upper first permanent molars erupted. The dental size measurement obtained with 3Shape Trios Scanner was compared with that obtained clinically with the aid of a digital caliper, as well as the measurements made with plaster models and filament printed models. For data analysis, the intraclass correlation coefficient (ICC) was performed and the agreement was categorized according to it. The Bland–Altman analysis was also applied to the data to graphically display the concordance. Results: There was no difference in agreement between measurements made in plaster and filament models compared to the reference method, and for measurements in the digital model, the agreement was low or zero in the molar region. Conclusion: According to the present study, we can conclude that both plaster and filament models presented values that are faithful to those obtained clinically and that the evaluated region affected the agreement with the reference method.

Use of 3-D Printed Models for Implant Placement - A Case Series

2021 ◽  
Author(s):  
Soundariya Bala Muralei
Keyword(s):  
Dental Implants ◽  
Alveolar Bone ◽  
Three Dimensional ◽  
Case Series ◽  
Proper Position ◽  
Anatomical Structures ◽  
Long Term Stability ◽  
Implant Placement ◽  
Plaster Models

Long-term stability of a dental implant depends on various factors, one among them is proper position within the alveolar bone. Pre-operative thorough examination of the surgical site is preliminary step while planning dental implants. Conventional techniques such as Intra-Oral Periapical Radiograph and Ortho Pantamogram sometimes not sufficient and clinical scenario always surprises the surgeon. Later advent of Cone-Beam Computed Tomography alleviated this problem to some extent but there are some clinical situations such as resorbed ridge where better visualisation is needed. This led to the innovation of rapid prototyping techniques for the fabrication of three-dimensional complex structures. This technology has numerous applications from the development of an instrument, 3-D printed anatomical models to the fabrication of 3-D printed tissues for regeneration procedures. A 3-D printed model is much more useful than plaster models in many aspects such as demonstrating anatomical structures, better treatment planning, and better understanding for the patient. Hence, this case series focuses on the use of 3-D printed models in the placement of dental implants.

The Hut-Hospital as Project and as Practice

2018 ◽  
Vol 62 (2) ◽  
pp. 76-97 ◽  
Author(s):  
Cristiana Bastos
Keyword(s):  
Twentieth Century ◽  
Indigenous Population ◽  
Three Dimensional ◽  
Indigenous Populations ◽  
Medical Assistance ◽  
Legal Documents ◽  
History Of ◽  
Conference Papers ◽  
Plaster Models ◽  
Different Sources

This article analyzes one kind of colonial equipment designed in the early twentieth century for the purpose of providing medical assistance to the indigenous populations of Angola and Mozambique. I will refer to it as a ‘hut-hospital’, although it had several forms and designations. The layout of hut-hospitals consisted of a main building and a number of hut-like units that were supposedly more attractive to the indigenous population and therefore more efficient than the large, rectangular buildings of the main colonial hospitals. Using different sources, including three-dimensional plaster models of hut-hospitals, photographs, legal documents, and 1920s conference papers and articles, I will investigate the relatively obscure history of this colonial artifact while exploring the use of imitation as part of the repertoire of colonial governance.

scholarly journals Accuracy of laser-scanned models compared to plaster models and cone-beam computed tomography

2013 ◽  
Vol 84 (3) ◽  
pp. 443-450 ◽  
Author(s):  
Jooseong Kim ◽  
Giseon Heo ◽  
Manuel O. Lagravère
Keyword(s):  
Computed Tomography ◽  
Cone Beam Computed Tomography ◽  
Intraclass Correlation ◽  
Three Dimensional ◽  
Laser Scanner ◽  
Cone Beam ◽  
Advantages And Disadvantages ◽  
Accuracy Of Measurements ◽  
Highly Correlated ◽  
Plaster Models

ABSTRACT Objective: To compare the accuracy of measurements obtained from the three-dimensional (3D) laser scans to those taken from the cone-beam computed tomography (CBCT) scans and those obtained from plaster models. Materials and Methods: Eighteen different measurements, encompassing mesiodistal width of teeth and both maxillary and mandibular arch length and width, were selected using various landmarks. CBCT scans and plaster models were prepared from 60 patients. Plaster models were scanned using the Ortho Insight 3D laser scanner, and the selected landmarks were measured using its software. CBCT scans were imported and analyzed using the Avizo software, and the 26 landmarks corresponding to the selected measurements were located and recorded. The plaster models were also measured using a digital caliper. Descriptive statistics and intraclass correlation coefficient (ICC) were used to analyze the data. Results: The ICC result showed that the values obtained by the three different methods were highly correlated in all measurements, all having correlations &gt;0.808. When checking the differences between values and methods, the largest mean difference found was 0.59 mm ± 0.38 mm. Conclusions: In conclusion, plaster models, CBCT models, and laser-scanned models are three different diagnostic records, each with its own advantages and disadvantages. The present results showed that the laser-scanned models are highly accurate to plaster models and CBCT scans. This gives general clinicians an alternative to take into consideration the advantages of laser-scanned models over plaster models and CBCT reconstructions.

scholarly journals Influence of the Gingival Condition on the Performance of Different Gingival Displacement Methods—A Randomized Clinical Study

2021 ◽  
Vol 10 (13) ◽  
pp. 2747
Author(s):  
Katharina Kuhn ◽  
Heike Rudolph ◽  
David Zügel ◽  
Benjamin A. Just ◽  
Michael Hrusa ◽  
...  
Keyword(s):  
Clinical Study ◽  
Three Dimensional ◽  
Gingival Recession ◽  
Randomized Clinical Study ◽  
Opposite Quadrant ◽  
Superior Sulcus ◽  
And Control ◽  
Plaster Models ◽  
Conventional Impression ◽  
Minor Extent

This randomized clinical study examined the influence of the gingival condition—healthy versus mild inflammation—on sulcus representation and possible gingival recession for two gingival displacement procedures prior to conventional impression making. The interventions double cord technique or a kaolin paste containing aluminum chloride were applied to 40 probands. The opposite quadrant served as intrapersonal reference (split-mouth design). Precision impressions were then made. Extraoral digitization of the plaster models resulting from the reference impression prior to gingival displacement, the intervention impression and control impressions were the basis for the computer-aided three-dimensional analysis. After six months, a mild artificial gingivitis was induced, and the contralateral quadrant (cross-over design) was examined for the intervention. The gingivitis deteriorated the sulcus representation for the double cord technique group but did not affect the paste technique group. The gingival condition had no influence on the marginal gingiva height changes. The minor extent of those changes, which were measured up to six months after intervention at the palatal study site, were not considered to be in the clinically relevant range for gingival recession. For healthy gingiva, the cord technique showed superior sulcus representation compared to the paste technique. This advantage was lost to a great extent under the conditions of mild gingivitis.

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