a. the front-temporal angle
When designing the hairline, the position and shape of the temple hair must always be considered. The temporal angle represents the “unzipping” of the hairline and the temple and should exhibit an angle in which the temple and the hairline roughly match in shape and in angle. This is why a “toupee” or a hair system can at times be easily spotted as unnatural. If the toupee extends forward without temple hair that matches it, it creates what is known as a “lid effect” and thereby may appear unnatural. The temple to hairline angle should closely match. If someone wears a hat to camouflage one’s baldness, all you have to do is look at the degree of temple recession to estimate how much loss that person has centrally along the hairline. When designing a hairline, always respect the relative position and shape of the temples.
b. acute angle
According to all the text-books I read, the front temporal angle is an ACUTE angle.
The two arms of the angle (the frontal-hairline and the lateral hairline) create an acute angle (fig. 1)
c. the hairline design
I saw there are two ways create the "acute angle".
The first: just draw two lines and create the acute angle. In this case, the surgeon needs to bring forward the lateral hairline (fig.2)
The other one is:draw 3 lines. The lateral hairline is broken down in 2 lines. The first crates a 90° angle with the frontal hairline and the other one (the lower part) creat an acute angle with the frontal hairline (fig. 3)
The good part of this solution is that the surgeon doesn't need to rebuild the lateral hairline/frontotemporal peaks
4. my question
given that the first solution is 100% correct, is the second anatomically wrong?