Tooth Segmentation and Labeling from Digital Dental Casts

OBJECTIVE: The purpose of this study was to compare dental size measurements, their reproducibility and the application of Tanaka and Johnston regression equation in predicting the size of canines and premolars on plaster and digital dental casts. METHODS: Thirty plaster casts were scanned and digitized. Mesiodistal measurements of the teeth were then performed with a digital caliper on the plaster and digital casts using O3d software system (Widialabs©).The sum of the sizes of the lower incisors was used to obtain predictive values of the sizes of the premolars and canines using the regression equation, and these values were compared with the actual sizes of the teeth. The data were statistically analyzed by applying to the results Pearson's correlation test, Dahlberg's formula, paired t-test and analysis of variance (p<0.05). RESULTS: Excellent intraexaminer agreement was observed in the measurements performed on both dental casts. No random error was present in the measurements obtained with the caliper and systematic error (bias) was more frequent in the digital casts. Space prediction obtained by applying the regression equation was greater than the sum of the canines and premolars on the plaster and digital casts. CONCLUSIONS: Despite an adequate reproducibility of the measurements performed on both casts, most measurements on the digital casts were higher than those on the plaster casts. The predicted space was overestimated in both models and significantly higher in the digital casts.

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A Six-Center International Study of Treatment Outcome in Patients with Clefts of the Lip and Palate: Part 3. Dental Arch Relationships

The Cleft Palate-Craniofacial Journal ◽

10.1597/1545-1569_1992_029_0405_asciso_2.3.co_2 ◽

1992 ◽

Vol 29 (5) ◽

pp. 405-408 ◽

Cited By ~ 78

Author(s):

Michael Mars ◽

Catherine Asher-Mcdade ◽

Viveca Brattström ◽

Erik Dahl ◽

John Mcwilliam ◽

...

Keyword(s):

Treatment Outcome ◽

Cleft Palate ◽

Treatment Program ◽

Surgical Techniques ◽

International Study ◽

The Other ◽

Dental Arch ◽

Treatment Regimens ◽

Dental Casts

One hundred and forty-nine dental casts of subjects with complete unilateral clefts of the lip and palate from six European cleft palate centers were assessed by means of the Goslon Yardstick. The Yardstick proved capable of discriminating between the quality of the dental arch relationships between the six centers. Two centers showed especially poor results. Three centers obtained satisfactory results although differing surgical techniques were used in these centers. One of the centers showing satisfactory dental arch relationships employed a more complex and expensive treatment program than the other two centers, which both used simpler centralized treatment regimens.

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Morphologic Effect of Preoperative Maxillofacial Orthopedics (T-Traction) on the Maxilla in Unilateral Cleft Lip and Palate Patients

The Cleft Palate-Craniofacial Journal ◽

10.1597/1545-1569_1993_030_0029_meopmo_2.3.co_2 ◽

1993 ◽

Vol 30 (1) ◽

pp. 29-34 ◽

Cited By ~ 5

Author(s):

Margareta Larson ◽

Kjell-Ove Sällström ◽

Ola Larson ◽

John Mcwilliam ◽

Margareta Ideberg

Keyword(s):

Cleft Lip ◽

Cleft Lip And Palate ◽

External Device ◽

Normal Anatomy ◽

Before And After ◽

Dental Casts

Sixty-eight children born with complete unilateral cleft lip and palate were studied using dental casts taken at ages 0-0,1; 0,2-0,4; and 0,5-0,6 years of age. They were all treated with preoperative maxillofacial orthopedics using an external device (T-traction). The treatment was started after the first model was taken. Dental casts were analyzed regarding the morphology of the cleft region and the maxillary segments before and after treatment. The measurements were compared with measurements on dental casts of nontreated cleft children of similar age. The results suggest that a more normal anatomy of the cleft region occurs during the first 6 months of life whether preoperative maxillofacial orthopedics (T-traction) is used or not. However, this normalized growth seems to occur faster with the T-traction.

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The Relationship between Palatal Displacement of Upper Canines and Incisors Widths in a Syrian Sample of Patients with Uncrowded Arches

The Journal of Contemporary Dental Practice ◽

10.5005/jp-journals-10024-1774 ◽

2015 ◽

Vol 16 (11) ◽

pp. 873-875 ◽

Cited By ~ 1

Author(s):

Luai Mahaini

Keyword(s):

Orthodontic Treatment ◽

Matched Control ◽

Control Sample ◽

Tooth Size ◽

Orthodontic Patients ◽

Treatment Plans ◽

The Right ◽

The Relationship ◽

Mandibular Incisors ◽

Dental Casts

ABSTRACT The aim of this study investigates mesiodistal crown size of the maxillary and mandibular incisors of patients with palatally impacted canines (PDC). Pretreatment dental casts of orthodontic patients with PDC of one or both maxillary canines (N: 33) were collected. This PDC sample was matched according to age and sex with pretreatment dental casts from unaffected orthodontic patients. For the PDC and matched control samples, maximum mesiodistal crown diameters were recorded for the four incisors on the right side only. The results showed that, on average, the mesiodistal crown diameters for the maxillary and mandibular incisors measured smaller in the PDC sample than in the control sample. These findings of statistically significant tooth-size reductions associated with PDC occurrence indicate a generalized pattern of reduced tooth size as a characteristic associated with the PDC anomaly. Further, the presence of generalized tooth-size reduction in cases with palatally displaced canines help explain why most orthodontic treatment plans for PDC patients are of the nonextraction type. How to cite this article Mahaini L. The Relationship between Palatal Displacement of Upper Canines and Incisors Widths in a Syrian Sample of Patients with Uncrowded Arches. J Contemp Dent Pract 2015;16(11):873-875

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Efficiency and Accuracy of Three-Dimensional Models Versus Dental Casts: A Clinical Study

Turkish Journal of Orthodontics ◽

10.5152/turkjorthod.2019.19034 ◽

2019 ◽

Vol 32 (4) ◽

pp. 214-218

Author(s):

Hakan Yilmaz ◽

◽

Fethiye Cakmak Ozlu ◽

Carmen Karadeniz ◽

Ersan Ilsay Karadeniz ◽

...

Keyword(s):

Clinical Study ◽

Three Dimensional ◽

Dimensional Models ◽

Three Dimensional Models ◽

Dental Casts

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A comparison between orthodontic model analysis using conventional methods and iModelAnalysis

Dental Journal (Majalah Kedokteran Gigi) ◽

10.20473/j.djmkg.v51.i4.p173-178 ◽

2018 ◽

Vol 51 (4) ◽

pp. 173

Author(s):

Vita Previa Indirayana ◽

Gita Gayatri ◽

N. R. Yuliawati Zenab

Keyword(s):

Sampling Method ◽

Model Analysis ◽

T Test ◽

Normality Test ◽

Time Period ◽

Significant Difference ◽

The Mean ◽

Conventional Methods ◽

Paired T Test ◽

Dental Casts

Background: Model analysis constitutes an essential aspect of orthodontic diagnostic practice. Pavan has developed an application to simplify the mathematical calculations employed in orthodontic model analysis. Purpose: This study was conducted to obtain the differences in results and time periods of model analysis using conventional means and iModelAnalysis. Methods: The research represented a comparative analytic study. The populations comprised dental casts dating from 2014 in the Orthodontics Laboratory of Padjadjaran University. The samples comprised 31 dental casts which were subjected to a total sampling method consisting of two treatments; a conventional method calculation and one using iModelAnalysis. A normality test was conducted and processed using a paired t-test with α=0.05. Results: The means of arch length discrepancies were 1.64±2.63 mm and 1.37±3.07 mm for the conventional methods and 1.65±2.43mm and 1.42±3.04mm for iModelAnalysis. The results of a Bolton analysis for conventional methods were 78.05±2.69% and 91.93±1.29%, while those for iModelAnalysis were 77.91±2.70% and 91.96±2.13%. A Howes analysis of conventional methods produced a result of 45.56±2.83%, while for an iModelAnalysis one of 45.56±2.85%. Pont analysis for conventional methods was 39.35±0.04 mm and 49.17±2.55 mm, while for iModelAnalysis it was 39.35±0.07 mm and 49.19±2.57mm. The mean of the duration of analysis using conventional methods was 1703.81±56.46 seconds, while for iModelAnalysis it was 990.06±34.87 seconds. A normality test confirmed that the data was normally distributed (p>0.05). The results of a paired sample t-test with p>0.05 showed that there was no significant difference between the results of each analysis, while there was significant difference in the time period of analysis. Conclusion: There was no difference in the analysis results. However, there was difference in the time period of analysis between conventional methods and that of iModelAnalysis.

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Cone Beam Computed Tomography-based Evaluation of the Anterior Teeth Position Changes obtained by Passive Self-ligating Brackets

The Journal of Contemporary Dental Practice ◽

10.5005/jp-journals-10024-1901 ◽

2016 ◽

Vol 17 (8) ◽

pp. 623-629 ◽

Cited By ~ 1

Author(s):

Ana CCF Conti ◽

Fernando K Rhoden ◽

Liliana Á Maltagliati ◽

Renata R Almeida-Pedrin ◽

Leopoldino C Filho ◽

...

Keyword(s):

Computed Tomography ◽

Cone Beam Computed Tomography ◽

Steel Wire ◽

Cone Beam ◽

Orthodontic Appliances ◽

Average Increase ◽

Anterior Teeth ◽

Transverse Distance ◽

Dental Crowding ◽

Dental Casts

ABSTRACT Aim The objective of this study was to evaluate the anterior teeth position changes obtained by passive self-ligating brackets using cone beam computed tomography (CBCT). Materials and methods Twenty patients with a mean age of 16.5 years, class I malocclusion, constricted maxillary arch, and teeth crowding above 5 mm were enrolled in this study, and treated by passive orthodontic self-ligating brackets. A sequence of stainless steel thermoset wire was implemented with ending wire of 0.019” × 0.025”. The CBCT and dental casts were obtained prior to the installation of orthodontic appliances (T1), and 30 days after rectangular steel wire 0.019” × 0.025” installation (T2). The measurements in CBCT were performed with the Anatomage software, and the dental casts were evaluated with a digital caliper rule with an accuracy of 0.01 mm. Results The CBCT data demonstrated mean buccal inclination of the upper and lower central incisors ranging from 6.55° to 7.24° respectively. The upper and lower lateral incisors ranged from 4.90° to 8.72° respectively. The lower canines showed an average increase of 3.88° in the buccal inclination and 1.96 mm in the transverse intercuspal distance. The upper canines showed a negative inclination with mean average of −0.36°, and an average increase of 0.82 mm in the transverse distance, with negative correlation with the initial crowding. Conclusion Treatment with passive self-ligating brackets without obtaining spaces increases buccal inclination of the upper and lower incisors with no correlation with the amount of initial teeth crowding. The intercanine distance tends to a small increase showing different inclinations between the arches. Clinical significance When taking into account the selfligating brackets, the amount of initial dental crowding is not a limitation factor that could increase the buccal inclination of the anterior teeth. How to cite this article Rhoden FK, Maltagliati LÁ, de Castro Ferreira Conti AC, Almeida-Pedrin RR, Filho LC, de Almeida Cardoso M. Cone Beam Computed Tomography-based Evaluation of the Anterior Teeth Position Changes obtained by Passive Selfligating Brackets. J Contemp Dent Pract 2016;17(8):623-629.

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