Podcast
Questions and Answers
What does the anatomic portion of the study model represent?
What does the anatomic portion of the study model represent?
- The impression of the dental arch and its surrounding soft tissue (correct)
- The supporting stone base of the model
- The trimmed section for aesthetic purposes
- The overall height of the study model
What is contained in the artistic portion of the study model?
What is contained in the artistic portion of the study model?
- The aesthetically pleasing stone base supporting the anatomic portion (correct)
- The calculations for arch expansion
- The excess flash and bulk of the impressions
- The measurements of the incisors
Which procedure is NOT part of the preliminary steps in model fabrication?
Which procedure is NOT part of the preliminary steps in model fabrication?
- Using the wax bite to occlude the models
- Measure the width of the maxillary incisors (correct)
- Remove excessive bulk on the periphery of the models
- Remove nodules on the occluding surfaces of the teeth
What does Pont's analysis primarily measure for dental arch evaluation?
What does Pont's analysis primarily measure for dental arch evaluation?
What is the formula to calculate the expected arch width in the premolar region?
What is the formula to calculate the expected arch width in the premolar region?
How is the amount of lateral expansion determined using Pont's analysis?
How is the amount of lateral expansion determined using Pont's analysis?
What is a significant drawback of Pont's analysis when assessing dental arches?
What is a significant drawback of Pont's analysis when assessing dental arches?
What is one of the ideal requirements for orthodontic study models?
What is one of the ideal requirements for orthodontic study models?
Which of the following is a benefit of making study models?
Which of the following is a benefit of making study models?
What aspect of dentition can study models help visualize?
What aspect of dentition can study models help visualize?
Why are study models necessary for medicolegal considerations?
Why are study models necessary for medicolegal considerations?
How can study models be used during treatment?
How can study models be used during treatment?
What is one of the uses of study models in assessing dental anatomy?
What is one of the uses of study models in assessing dental anatomy?
Which requirement is crucial for the appearance of orthodontic study models?
Which requirement is crucial for the appearance of orthodontic study models?
What role do study models play if a patient needs to transfer to another clinician?
What role do study models play if a patient needs to transfer to another clinician?
What does Total Tooth Material (TTM) refer to?
What does Total Tooth Material (TTM) refer to?
How is Basal Arch Length (BAL) measured in the maxillary arch?
How is Basal Arch Length (BAL) measured in the maxillary arch?
What is indicated by comparing PMBAW and PMD?
What is indicated by comparing PMBAW and PMD?
What is the correct formula to calculate the percentage of premolar diameter to tooth material?
What is the correct formula to calculate the percentage of premolar diameter to tooth material?
Wayne A. Bolton's analysis focuses on achieving a balance between which elements?
Wayne A. Bolton's analysis focuses on achieving a balance between which elements?
What does the Premolar Basal Arch Width (PMBAW) measure?
What does the Premolar Basal Arch Width (PMBAW) measure?
Which measurement is taken from Downs B point in the mandibular arch?
Which measurement is taken from Downs B point in the mandibular arch?
What is the significance of TTM in orthodontics?
What is the significance of TTM in orthodontics?
What is the overall ratio of the mesiodistal widths of the 12 mandibular teeth to the 12 maxillary teeth according to Bolton analysis?
What is the overall ratio of the mesiodistal widths of the 12 mandibular teeth to the 12 maxillary teeth according to Bolton analysis?
If the anterior ratio is greater than 77.2%, what action does Bolton prefer to take?
If the anterior ratio is greater than 77.2%, what action does Bolton prefer to take?
In what population was the Bolton analysis conducted, leading to potential limitations in its applicability?
In what population was the Bolton analysis conducted, leading to potential limitations in its applicability?
How is the anterior ratio calculated?
How is the anterior ratio calculated?
What is the main focus of Carey's analysis?
What is the main focus of Carey's analysis?
What is the technique recommended for reducing excessive tooth material in the upper arch?
What is the technique recommended for reducing excessive tooth material in the upper arch?
What is the anterior distance measured to determine arch length in Carey's analysis?
What is the anterior distance measured to determine arch length in Carey's analysis?
What is a potential drawback of Bolton analysis related to maxillary canines?
What is a potential drawback of Bolton analysis related to maxillary canines?
What is the estimated width of the maxillary canine and premolar in one quadrant based on the given formula?
What is the estimated width of the maxillary canine and premolar in one quadrant based on the given formula?
In what way does the Kesling diagnostic set-up assist clinicians?
In what way does the Kesling diagnostic set-up assist clinicians?
What is one of the primary uses of the diagnostic set-up mentioned in the content?
What is one of the primary uses of the diagnostic set-up mentioned in the content?
Which of the following statements is TRUE regarding the estimated width of mandibular canine and premolar?
Which of the following statements is TRUE regarding the estimated width of mandibular canine and premolar?
How can the diagnostic set-up serve as a motivational tool for patients?
How can the diagnostic set-up serve as a motivational tool for patients?
What is the first step in determining arch length using wire according to Carey's analysis?
What is the first step in determining arch length using wire according to Carey's analysis?
What adjustment is indicated if the arch length discrepancy is between 2.5 to 5 mm?
What adjustment is indicated if the arch length discrepancy is between 2.5 to 5 mm?
What is the purpose of a mixed dentition analysis?
What is the purpose of a mixed dentition analysis?
Which of the following describes Moyer's mixed dentition analysis?
Which of the following describes Moyer's mixed dentition analysis?
In Carey's analysis, what is done if the arch length discrepancy is greater than 5 mm?
In Carey's analysis, what is done if the arch length discrepancy is greater than 5 mm?
When determining arch length, if the anterior teeth are proclined, where should the wire be passed?
When determining arch length, if the anterior teeth are proclined, where should the wire be passed?
Which method is NOT part of the strategic categories for mixed dentition analysis?
Which method is NOT part of the strategic categories for mixed dentition analysis?
What is typically measured to determine the discrepancy in arch length?
What is typically measured to determine the discrepancy in arch length?
Flashcards
Study Models
Study Models
Accurate plaster reproductions of teeth and surrounding soft tissues, used for diagnosing occlusion and dentition.
Orthodontic Study Model Requirements
Orthodontic Study Model Requirements
Accurate reproduction of teeth and surrounding tissues, symmetrical and pleasing, clear view of occlusion from below, consistent with design measurements, smooth, glossy, and marker-proof.
Treatment Planning
Treatment Planning
Using study models to plan a course of action for correcting dental issues.
Visualizing Occlusion
Visualizing Occlusion
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Intermaxillary Relationships
Intermaxillary Relationships
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Study Model Uses
Study Model Uses
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Patient Motivation
Patient Motivation
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Treatment Evaluation
Treatment Evaluation
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Anatomic Portion of Study Model
Anatomic Portion of Study Model
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Artistic Portion of Study Model
Artistic Portion of Study Model
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Pont's Analysis
Pont's Analysis
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Maxillary Incisor Measurement (SI)
Maxillary Incisor Measurement (SI)
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Measured Premolar Value (MPV)
Measured Premolar Value (MPV)
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Calculated Premolar Value (CPV)
Calculated Premolar Value (CPV)
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Model Analysis Procedure
Model Analysis Procedure
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Model Trimming Procedures
Model Trimming Procedures
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Total Tooth Material (TTM)
Total Tooth Material (TTM)
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Basal Arch Length (BAL)
Basal Arch Length (BAL)
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Premolar Diameter (PMD)
Premolar Diameter (PMD)
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Premolar Basal Arch Width (PMBAW)
Premolar Basal Arch Width (PMBAW)
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What is the formula for "Percentage of Premolar Diameter to Tooth Material"?
What is the formula for "Percentage of Premolar Diameter to Tooth Material"?
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What is the formula for "Percentage of Premolar Basal Arch Width to Tooth Material"?
What is the formula for "Percentage of Premolar Basal Arch Width to Tooth Material"?
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What is the formula for "Percentage of Basal Arch Length to Tooth Material"?
What is the formula for "Percentage of Basal Arch Length to Tooth Material"?
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What does Bolton's analysis help determine?
What does Bolton's analysis help determine?
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Bolton Analysis
Bolton Analysis
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Overall Ratio
Overall Ratio
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Anterior Ratio
Anterior Ratio
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Excess Tooth Material
Excess Tooth Material
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Carey's Analysis
Carey's Analysis
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Arch Length
Arch Length
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Arch Perimeter Analysis
Arch Perimeter Analysis
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Malocclusion
Malocclusion
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Tanaka and Johnson Formula
Tanaka and Johnson Formula
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Kesling Diagnostic Set-up
Kesling Diagnostic Set-up
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Uses of Kesling Diagnostic Set-up
Uses of Kesling Diagnostic Set-up
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Tooth Size-Arch Length Discrepancy
Tooth Size-Arch Length Discrepancy
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Motivation in Orthodontics
Motivation in Orthodontics
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Wire Placement in Carey's Analysis
Wire Placement in Carey's Analysis
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Arch Length Measurement
Arch Length Measurement
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Tooth Material Measurement
Tooth Material Measurement
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Arch Length Discrepancy
Arch Length Discrepancy
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Carey's Analysis: 0-2.5mm Discrepancy
Carey's Analysis: 0-2.5mm Discrepancy
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Carey's Analysis: 2.5-5mm Discrepancy
Carey's Analysis: 2.5-5mm Discrepancy
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Carey's Analysis: >5mm Discrepancy
Carey's Analysis: >5mm Discrepancy
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Mixed Dentition Analysis Purpose
Mixed Dentition Analysis Purpose
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Study Notes
Fifth Stage Orthodontics Study Models
- Study models are accurate plaster reproductions of teeth and surrounding soft tissues
- They're essential diagnostic records, used to study occlusion and dentition in three dimensions
- Ideal models accurately reproduce teeth and surrounding soft tissues
- Models should be trimmed for symmetry and aesthetics, showing any asymmetrical arch forms clearly
- Models should be trimmed to show dental occlusion when placed on their backs
- Models should replicate proposed trimming measurements and angles
- Models must have smooth, bubble-free surfaces with sharp angles at joins
- Finished models should have a glossy, stain-resistant finish
Why Study Models Are Used (Benefits)
- Invaluable for treatment planning, as they're the only three-dimensional records of a patient's dentition
- Allow visualization of occlusion from the lingual aspect
- Provide a permanent record of intermaxillary relationships and occlusion at the start of treatment, important for legal considerations
- Serve as a visual aid for monitoring tooth movement during treatment
- Help motivate patients by showing treatment progress
- Act as a reference for comparison at the end of treatment and for post-treatment changes
- Remind patients and parents of the original condition at the start of treatment
- Important records in case of patient transfer to another clinician
Uses of Study Models
- Assess and record dental anatomy
- Assess and record intercuspation
- Assess and record arch form
- Assess and record occlusion curves
- Evaluate occlusion using articulators
- Measure treatment progress
- Identify abnormalities, such as localized enlargements or arch distortions
- Calculate space requirements/discrepancies
- Provide records from before, immediately after, and several years following treatment
- Study treatment procedures and stability
Parts of Study Models
- Anatomic Portion: The part that shows the actual impression of the dental arch and its surrounding soft tissue structures. It must be preserved during trimming.
- Artistic (or Architectural) Portion: The stone base that supports the anatomic portion. The shape is trimmed to make the overall form of the dental arch clear and easy to view.
Study Model Fabrication and Trimming
- Remove any excess flash or excessive bulk from the model's edges
- Remove any nodules present on the occlusal surfaces of the model's teeth
- Remove any extensions in posterior areas of the model
- Use a wax bite to occlude the model
Model Analysis (Pont's Analysis)
- Pont's analysis uses measurement of maxillary incisors to estimate the width of the premolar and molar regions in a dental arch
- This helps estimate the amount of expansion required when malocclusion is present
Model Analysis (Other Analyses)
- Other analyses (Linder Harth, Korkhaus, Ashley Howe) refine the process to account for more teeth and factors influencing arch dimensions. These formulas may include measurements of premolars, total tooth material (TTM), maxillary and mandibular incisors, and canines/premolars
Drawbacks of Pont's Analysis
- Maxillary lateral incisors are commonly missing, prone to morphogenetic alteration.
- It does not take into account skeletal relationships or the relationship of teeth to supporting bone
- Different populations may require additional adjustments; not just based on a numerical index
Mixed Dentition Analysis
- Moyer's: Predicts space needs based on the correlation between the sizes of mandibular incisors and other teeth, using the amount of space for each position
- Tanaka and Johnson: Simplified Moyer's 75% predictor table, proposing a formula to calculate the dimensions of canines and premolars
- Includes using a mixed dentition analysis to figure out space for permanent teeth eruption and subsequent adjustments
Carey's Analysis
- Carey's uses arch length and tooth material to identify discrepancies, usually with the lower arch, to assess treatment planning requirements such as tooth extraction, or occlusal adjustmnets
Kesling Diagnostic Set-up
- A tool to plan treatment by creating a simulation of various tooth movements
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Description
This quiz covers the importance and specifications of study models in orthodontics. Learn about their role in treatment planning, occlusion visualization, and the necessary characteristics for an ideal model. Enhance your understanding of how these models are essential diagnostic tools in three-dimensional analysis.