 hello everyone welcome back to another session in dentistry and more so today we have dentogenic concept or SPF factors in tooth selection and prosthodontics so how do we select the teeth for dental fabrication it is based on mainly based on the dentogenic concept that is sex personality and age factors so let's learn in detail about the dentogenic concept or SPF factors so dentogenic concept was introduced by John pre fresh John P fresh and Ronald D Fisher so these two people put forward this concept of dentogenic based on sex age and personality so which determine the form of tooth so we know the quality of masculinity or femininity personality and various physiological ages will be revealed in the smile of the patient so we'll start with the first character that is sex of the patient so we have two features one is musculine features and the feminine features so for musculine features we need to keep teeth with which prominent teeth which should be large sized then square arch form then square labial surface then darker shade it will be the reflact smiling line then the incisal corners will be square then again the canine cervical line the cervical line of canine is more visible and prominent okay so cervical line is more visible so these are the musculine features of a person with respect to the teeth selection whereas the feminine features it will be smaller teeth and this will be curved contours and arches and there will be curved labial surfaces round incisal edges and corners there will be curved smiling line there will be curved smiling line and it has a delicate appearance then is usually smaller teeth that I already mentioned and regarding the canines so only the mesial third be seen only the mesial third okay whereas the musculine features is cervical line is more visible and prominent so these are the features of musculinity and feminine characteristics regarding the sex now let's move on to the personality features so in personality then they should select teeth according to the vigorous people personality and the delicate people so we can have two personality one is vigorous next one is delicate so we need to identify the person he or she belongs to which category so if the person is a vigorous characteristics persons with such personality should have more square teeth then larger teeth and also darker shade with sharp line ankles and point ankles this is for the vigorous personality whereas the delicate people we need to give the anterior tooth in a flat plane then the smaller tooth we can take and also the lighter shade and more symmetrically arranged teeth symmetric arrangement should not provide any sharp line ankles or point ankles so that is regarding the personality next we have the age so age factor we can have two groups one is the younger people and older people so younger people we need to keep lighter shades also more incisal translucency translucency should be more and minimal wear because they are younger people the attrition is not much pronounced in this group of people minimal wear and curved smile line okay curved smile line then pointed canines pointed canines whereas in older people we can give just opposite darker shade darker shades then less incisal translucency then more varying of incisal edges then flat smiling line and we should not keep any pointed canines we can make it a little flat or curved canines for the older people so along with this dendrogenic concept we need to learn one more interpretation of dendrogenic concept that is dynastatic interpretation of dendrogenic concept so this dynastatic and dendrogenic concept together gives the ultimate aesthetics okay so dendrogenic is based on sex personality and age but as dynastatic theory it is says that the secondary factors of dendrogenic concept so it is compound word this line means dynamics in Greek so it is nothing but the secondary factors of dendrogenic concept okay so it basically concerns with three important divisions of the denture fabrication one is the tooth tooth its position and its matrix so this dynastatic techniques involves shade selection one is shade selection then the depth grinding then the abrasion factors then comes the embrasures and diastomers embrasures and diastomers then we have the buckle corridor buckle corridor then the gum line danger base contouring and the tissue stippling so all these comes under as a secondary factors of this dendrogenic concept so all these are shade depth grinding abrasion factors embrasures diastomers buckle corridor all these comes as a dynastatic factors that is nothing but the secondary factors of dendrogenic concept or SPA concept so this is basically what all the process on this follows to set the teeth especially the anterior teeth because it is mainly emphasizing on the aesthetics okay so hope you understood the small concept of dendrogenic SPA factors and diastatics okay so this might be asked as a short note so I'll come up with a new topic in prosthorontics thank you