Ignite Creation Date:
2024-05-06 @ 8:11 PM
Last Modification Date:
2024-10-26 @ 3:22 PM
Study NCT ID:
NCT06280027
Status:
COMPLETED
Last Update Posted:
2024-02-28
First Post:
2024-02-20
Brief Title:
Effect of Midline Discrepancy and Crown Width Disporportion on Esthetics
Sponsor:
Marmara University
Organization:
Marmara University
Study Overview
Official Title:
Effect of Midline Discrepancy and Crown Width Disproportion on Perception of Smile Esthetics
Status:
COMPLETED
Status Verified Date:
2024-02
Last Known Status:
None
Delayed Posting:
No
If Stopped, Why?:
Not Stopped
Has Expanded Access:
False
If Expanded Access, NCT#:
N/A
Has Expanded Access, NCT# Status:
N/A
Acronym:
None
Brief Summary:
In the web-based cross-sectional study 180 participants were included Half of them n 90 were patients laypeople of the university clinic and the remaining half were restorative dentists and prosthodontists with similar levels of clinical experience at least 3 years of academic training
A frontal view full-face portrait image of a 25-year-old female was selected as a model for the study with a smile exhibiting good dental alignment a quite good midline position and tooth size symmetry
The original image was digitally modified by a single restorative instructor using Photoshop CC Adobe USA software program The modifications were divided into three parts The first part was the generation of midline discrepancy at different levels The midline was digitally moved to the right side of the patient 1 - 4 millimeters gradually The midline movement was performed together with the whole maxillary arch
The second part was the generation of individual crown width disproportions Accordingly the mesiodistal width of the left central lateral and canine was digitally decreased one by one gradually while the width of the symmetrical teeth on the right side was simultaneously increased
The third part was the generation of distributed crown width disproportions Accordingly the total mesiodistal width of the left central lateral and canine was equally decreased gradually while the total width of the symmetrical teeth on the right side was simultaneously increased
In total 15 images were displayed in random order to the participants including the original image An online survey was generated to quantitatively evaluate the level of esthetic perception Subsequently the participants were asked to evaluate the level of smile esthetics of the presented random images without being informed about the digital manipulations of the images The participants were even not informed about the original image They were expected to answer the question How esthetic do you consider this smile The evaluation of each image was performed via a Visual analog scale VAS ranging from point 0 extremely not esthetic to point 100 extremely esthetic
A frontal view full-face portrait image of a 25-year-old female was selected as a model for the study with a smile exhibiting good dental alignment a quite good midline position and tooth size symmetry
The original image was digitally modified by a single restorative instructor using Photoshop CC Adobe USA software program The modifications were divided into three parts The first part was the generation of midline discrepancy at different levels The midline was digitally moved to the right side of the patient 1 - 4 millimeters gradually The midline movement was performed together with the whole maxillary arch
The second part was the generation of individual crown width disproportions Accordingly the mesiodistal width of the left central lateral and canine was digitally decreased one by one gradually while the width of the symmetrical teeth on the right side was simultaneously increased
The third part was the generation of distributed crown width disproportions Accordingly the total mesiodistal width of the left central lateral and canine was equally decreased gradually while the total width of the symmetrical teeth on the right side was simultaneously increased
In total 15 images were displayed in random order to the participants including the original image An online survey was generated to quantitatively evaluate the level of esthetic perception Subsequently the participants were asked to evaluate the level of smile esthetics of the presented random images without being informed about the digital manipulations of the images The participants were even not informed about the original image They were expected to answer the question How esthetic do you consider this smile The evaluation of each image was performed via a Visual analog scale VAS ranging from point 0 extremely not esthetic to point 100 extremely esthetic
Detailed Description:
The web-based cross-sectional study was designed and conducted in a university clinic between June and December 2023 180 participants were included in the study Half of them n 90 were patients laypeople of the university clinic and the remaining half were restorative dentists and prosthodontists with similar levels of clinical experience at least 3 years of academic training
A frontal view full-face portrait image of a 25-year-old female was selected as a model for the study with a smile exhibiting good dental alignment a quite good midline position and tooth size symmetry A perfectly symmetrical face was not demanded for the model in this study as the human face is considered usually not symmetrical The frontal smiling image was captured using a DSLR full-frame camera D750 Nikon Japan a macro objective 105 mm VR Nikkor Nikon and a dual paraflashsoftbox VL400 Visico China The image was saved in RAW data format and named as the original image
The original image was digitally modified by a single restorative instructor using Photoshop CC Adobe USA software program The modifications were divided into three parts The first part was the generation of midline discrepancy at different levels The midline was digitally moved to the right side of the patient 1 - 4 millimeters gradually The midline movement was performed together with the whole maxillary arch Simultaneously the maxillary right first molar was gradually darkened to provide a natural-like space at the right buccal corridor
The second part was the generation of individual crown width disproportions Accordingly the mesiodistal width of the left central lateral and canine was digitally decreased one by one gradually while the width of the symmetrical teeth on the right side was simultaneously increased Therefore disproportions of 1 mm and 2 mm were digitally generated for each tooth For instance to achieve 1 mm of disproportion on the central incisor the left central width was decreased by 05 mm while the right central width was increased by 05 mm
The third part was the generation of distributed crown width disproportions Accordingly the total mesiodistal width of the left central lateral and canine was equally decreased gradually while the total width of the symmetrical teeth on the right side was simultaneously increased Therefore the distributed disproportions of 1 - 4 mm were digitally generated for the group of teeth For instance to achieve 1 mm of distributed disproportion the total width of the left central lateral and canine was decreased by 05 mm and the total width of the anterior teeth on the right side was increased by 05 mm 05 mm was shared equally by each tooth Simultaneously the maxillary right first molar was gradually darkened to provide a natural-like space at the right buccal corridor
In total 15 images were displayed in random order to the participants including the original image An online survey was generated to quantitatively evaluate the level of esthetic perception At the beginning of the survey the participants declared their profession age and gender All the images were presented to the participants on a digitally calibrated monitor iPad Pro 129 Apple Inc USA to minimize the standardization limitations Subsequently the participants were asked to evaluate the level of smile esthetics of the presented random images without being informed about the digital manipulations of the images The participants were even not informed about the original image They were expected to answer the question How esthetic do you consider this smile The evaluation of each image was performed via a Visual analog scale VAS ranging from point 0 extremely not esthetic to point 100 extremely esthetic The participants moved a tab on the visual analog scale to a new position based on their subjective perception of the presented smile esthetics The scorings were carried out during midday 1000 AM-1400 PM with standardized artificial lighting conditions and without directly exposing the monitor to the sunlight The distance between the participant and the screen was consistently 60 cm which stands for the typical distance between two people during social contact Each participant could complete the survey once without a time limit and was limited to performing again A total of 180 participants completed the survey
A frontal view full-face portrait image of a 25-year-old female was selected as a model for the study with a smile exhibiting good dental alignment a quite good midline position and tooth size symmetry A perfectly symmetrical face was not demanded for the model in this study as the human face is considered usually not symmetrical The frontal smiling image was captured using a DSLR full-frame camera D750 Nikon Japan a macro objective 105 mm VR Nikkor Nikon and a dual paraflashsoftbox VL400 Visico China The image was saved in RAW data format and named as the original image
The original image was digitally modified by a single restorative instructor using Photoshop CC Adobe USA software program The modifications were divided into three parts The first part was the generation of midline discrepancy at different levels The midline was digitally moved to the right side of the patient 1 - 4 millimeters gradually The midline movement was performed together with the whole maxillary arch Simultaneously the maxillary right first molar was gradually darkened to provide a natural-like space at the right buccal corridor
The second part was the generation of individual crown width disproportions Accordingly the mesiodistal width of the left central lateral and canine was digitally decreased one by one gradually while the width of the symmetrical teeth on the right side was simultaneously increased Therefore disproportions of 1 mm and 2 mm were digitally generated for each tooth For instance to achieve 1 mm of disproportion on the central incisor the left central width was decreased by 05 mm while the right central width was increased by 05 mm
The third part was the generation of distributed crown width disproportions Accordingly the total mesiodistal width of the left central lateral and canine was equally decreased gradually while the total width of the symmetrical teeth on the right side was simultaneously increased Therefore the distributed disproportions of 1 - 4 mm were digitally generated for the group of teeth For instance to achieve 1 mm of distributed disproportion the total width of the left central lateral and canine was decreased by 05 mm and the total width of the anterior teeth on the right side was increased by 05 mm 05 mm was shared equally by each tooth Simultaneously the maxillary right first molar was gradually darkened to provide a natural-like space at the right buccal corridor
In total 15 images were displayed in random order to the participants including the original image An online survey was generated to quantitatively evaluate the level of esthetic perception At the beginning of the survey the participants declared their profession age and gender All the images were presented to the participants on a digitally calibrated monitor iPad Pro 129 Apple Inc USA to minimize the standardization limitations Subsequently the participants were asked to evaluate the level of smile esthetics of the presented random images without being informed about the digital manipulations of the images The participants were even not informed about the original image They were expected to answer the question How esthetic do you consider this smile The evaluation of each image was performed via a Visual analog scale VAS ranging from point 0 extremely not esthetic to point 100 extremely esthetic The participants moved a tab on the visual analog scale to a new position based on their subjective perception of the presented smile esthetics The scorings were carried out during midday 1000 AM-1400 PM with standardized artificial lighting conditions and without directly exposing the monitor to the sunlight The distance between the participant and the screen was consistently 60 cm which stands for the typical distance between two people during social contact Each participant could complete the survey once without a time limit and was limited to performing again A total of 180 participants completed the survey
Study Oversight
Has Oversight DMC:
None
Is a FDA Regulated Drug?:
False
Is a FDA Regulated Device?:
False
Is an Unapproved Device?:
None
Is a PPSD?:
None
Is a US Export?:
None
Is an FDA AA801 Violation?:
None