Intra Oral Scanning of Edentulous Arches

Study Overview
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Brief Summary
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the aim of this study is to compare the influence of different palatal vault configurations on the accuracy and scan speed of IO scans in cases of completely edentulous arches. The null hypothesis is that there is no difference in scanning time, and trueness and precision of IO scans between class I, II and III palatal vault configurations.

Detailed Description
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A reference model will be created for each of the three groups with different palatal vault configurations. PVS material (DMG Silagum, Germany) will be used for impressions in a one-step process by an experienced operator, and type IV plaster (Heraeus, Germany) will be used to produce the models. These models will then bedigitized by an experienced operator using an extraoral scanner (Trios 3; 3Shape, Copenhagen, Denmark). The STL scan file of the maxillary model will be imported into CAD software (Meshmixer; Autodesk, San Rafael, CA, USA) to generate a reference file. Reference markers will then be added to the digital files to aid the superimposition process during digital subtraction operations.For intraoral scans, the entire maxilla of each patient will be digitally captured using an intraoral scanner (TRIOS POD, 3Shape, Copenhagen, Denmark).According to ISO standards, specifically ISO 5725-1, the accuracy of digital impressions obtained with intraoral scanners (IOS) will be evaluated according to two main parameters: trueness and precision.

Official Title
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Impact of Various Palatal Vault Configurations of Edentulous Arches on Scan Accuracy. An Invivo Clinical Study

Conditions
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Edentulous Jaw

Intervention / Treatment
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* Diagnostic Test: digital impression


Participation Criteria
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Eligibility Criteria
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Inclusion Criteria: 1. Full tooth loss in the maxilla; 2. Absence of infectious diseases; 3. Systemic good health; 4. Age between 50 and 75 years; 5. Willingness to cooperate throughout the data collection process Exclusion Criteria: Exclusion criteria included: 1. Presence of any remaining teeth; 2. Inability to comprehend the study's objectives and procedures; 3. Palatal defect or lesion; 4. Postoperative scarring on the palate; 5. Limitations in mouth opening.

Ages Eligible for Study
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Minimum Age: 50 Years
Maximum Age: 75 Years

Sexes Eligible for Study
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All

Accepts Healthy Volunteers
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Accepts Healthy Volunteers

Study Plan
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How is the study designed?
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Arms and Interventions

| Participant Group/Arm | Intervention/Treatment |
| --- | --- |
| Class I<br>(medium U-vault) | Diagnostic Test: digital impression<br>* intra oral scanning<br>|
| Class II<br>(deep-vault) | Diagnostic Test: digital impression<br>* intra oral scanning<br>|
| Class III<br>flat vault | Diagnostic Test: digital impression<br>* intra oral scanning<br>|

What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Trueness | Trueness is the degree of agreement between the digital impression and the reference scan. To assess trueness, we will measure the deviation between the reference and scanned files | 15 days | 

Secondary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| precision | Precision, is a statistical measure that quantifies the level of similarity between repeated samples within the same group. In the context of this study, the IOS impression STL files will be compared to each other in a manner similar to the previous comparisons | 15 days |