on approval from ethical committee of adhiparasakthi dental college and hospital , the study was started .
photographs of five different subjects with matched teeth were made using the digital single - lens reflex camera under high resolution . using adobe photoshop , version 7 ( adobe systems inc .
, san jose , ca , usa ) color of one of the selected central incisor of one of the photographs ( the other four were discarded ) was modified in different the different dimensions of color that is , hue , value , chroma to predetermined levels ( 2% , 4% , 6% , 8% , and  10% ) .
inclusion criteria being trainee dental surgeons of the selected institution and lay persons were people who visited the department of prosthodontics at adhiparasakthi dental college and hospital .
person with a known history of color blindness , person above the age of 50 years , and person who were not willing were excluded from the study .
the task was performed in a spacious room with multiple windows to avoid fatigue and allow for optimal lighting conditions .
the study is multicentric since it was conducted in five different centers , double - blinded since both the operator and assessors were not aware of the changes done to the photos and the key was kept aside till the end of the survey , randomized since the crri and lay person were selected at random with only the inclusion and exclusion criteria as guide , control trial as un - modified contralateral central incisor served as control .
the responses of crri and lay person were collected on a survey form and were recorded for statistical analysis .
table 1 and figure 1 on values of perceptibility of change in hue , value and chroma shows that lay person were able to perceive the change in value more than  8% , hue more than  10% and chroma more than  10% and the trainee dental surgeons was able to perceive changes in value more than  2% , hue more than  8% and chroma more than  8% .
this denotes that the trainee dental surgeons were able to perceive changes in value and chroma much more significantly than the lay person .
dental cri were able to perceive hue , value and chroma better than lay person comparison of the perceptibility of various changes in dimensions of color by dental color rendering index and lay person table 2 and figure 2 on values of acceptability of change in hue , value and chroma shows that as far as acceptance of color change is concerned , trainee dental surgeons were more critical in acceptance of changes as they did not accept changes in value less than  4% , hue less  8% than and chroma less than 10% .
comparatively lay person did not accept color changes value less than  6% , hue less  10% than and chroma less than  10% . lay person accepted color though it was different to a higher degree than dental cri comparison of the acceptability of changes in various dimensions of color by dental surgeons and lay person
objective beauty is based on the consideration of the object itself based on preconceived notions .
subjective beauty is a quality that is relative to the tastes of the person enjoying it .
when we smile , our smile could often become the target of close scrutiny by the person you are smiling at .
perception and acceptance of such color changes may or may not be an inherent or trained trait .
studies of douglas et al . have proved that among professionals , the perception of color change was higher .
studies have also proved that lay persons have a much higher tolerance level to variation in color . in a study by al - wahadni et al
, they found that patients were more satisfied with the color matching of their porcelain - fused - to - metal crowns more than their prosthodontists .
this leads us to speculate on whether the patient input is really necessary for shade selection .
moreover , no study has been conducted to know as to how and when this ability of the dental surgeon blooms . a study by kijima et al .
, it was noted that color discrimination was made firstly in terms of hue , secondly in terms of value , and thirdly in terms of chroma .
 color perception defectiveness can not be overcome by any number of years of experience and color - defective dentists should obtain assistance when matching tooth shades  .
hence , the question as to how and when does this ability of the dental surgeon to perceive and discern this color difference develops .
hence , a study was designed to test the perceptibility and acceptability of color variations between matched teeth among trainee dentist and the common man .
one of the central incisors was modified using photoshop in the three dimensions of color viz .
these modified photographs along with the unmodified picture were given to dental trainees and lay person and were asked to find out if they could discern the color change and what color they found acceptable .
the study shows that the dental trainee was able to perceive the color differences much better than lay person to a significant degree similar to those of capa et al .
it was also found that acceptance level of mismatched color was much lower in dental trainee than a lay person .
this proves that color perception is an acquired skill that starts much earlier in a dental surgeons life and may be honed through years of experience .
dental trainees were also more stringent on their acceptance of color variation to a significant level .
this may be because of setting a higher standard for oneself to overcome any failure that could arise because of color difference .
this learning is not about simple color perception but as put forth by kyle et al , it may instead result from how adaptation alters the relative salience of the target .
this could also be because of perceptual grouping at a psychological level and , at the same time , outlines the mechanisms for grouping at the neurophysiological level as proposed by pieter et al .
of the three - dimensions in color , both the dental surgeon and lay person were able to perceive changes in value more than hue .
this is consistent with the findings of ratzmann et al . who perceived similar results but varied from the studies of kijima et al
this could be due to increase in test subjects and the inclusion of lay person in the study group . though both subject groups were able to perceive color change , acceptability of color
both the groups were able to accept change done to chroma and hue to a greater degree than to changes done to value in that order .
with the limited results , it can be concluded that the perception of color difference seems to be a learned trait . whether it is enhanced by experience
is concerned , dental surgeons are stricter and hence are a better judge . but still as beauty is in the eyes of the beholder , the final onus of color selection is on the subject themselves .
 aim : the aim of this study was to find the difference in perceptibility and acceptability of changes done to various color coordinates of matched teeth , between trainee dental surgeons , and lay person.materials and methods : a photograph with a set of matched central incisor teeth was selected . in one of the central incisors , the color coordinates ( hue , value , and chroma ) were altered to a preset value . 
 these pictures were presented to trainee dental surgeons and lay person and their level of perception of color change and acceptance of color change was registered and compared.results:it was found that trainee dental surgeons fared better in perceiving the color change and accepted less of the color changed specimens . 
 the dimension of color that was more discerned both by lay person and trainee dental surgeons was value , hue , and last chroma.conclusion:when compared to a lay person , dental surgeons are more acute in perceiving color changes and do not accept the color difference between teeth to a higher degree . 
Materials and Methods
Results
Discussion
Conclusion
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