Can we use "into" instead of "in" here?

Either would be acceptable and easy to understand for english speakers
having said that a rule of thumb for in/into
You should choose whether you want to indicate the process of implantation (movement) or where the implant is located (position)

How to Use In and Into Correctly

These two prepositions have very different meanings and different rules for use. As is the case for many English grammar rules, however, there are exceptions. These exceptions are especially helpful for native English speakers to know, because they will recognize subtle differences in meaning.
These prepositions are not interchangeable. "Into" has motion. "In" is a location or position.

Study these simple examples: The cook was in the kitchen (position, location). The restaurant owner walked into the kitchen (movement).

Understand, however, that "into" and "in" overlap. Look at these examples: He threw the trash in the barrel. He threw the trash into the barrel. These two sentences say the same thing.


See in these following examples how, in most cases, the rules do apply. The flowers are in the room. The flowers are into the room. She danced in the studio. She danced into the studio. The bird flew into the glass. The bird flew in the glass. "Into" and "in" mean have very different functions and meaning in these examples.

How to Use In and Into Correctly | eHow.com

I feel that there is something material missing in this explanation though ti eludes me. Whoever wrote this is relying too much on that old standby, "As is the case for many English grammar rules, however, there are exceptions".

'in' has motion.

The bird flew in the window

shows motion but it differs in meaning from,

The bird flew into the window

There's no doubt that 'in' is a preposition of place but, 'in' is also possible in the example

The restaurant owner walked into/in the kitchen.

The 'be' verb often describes a state and we could use 'into' in this fashion,

The cook is into kitchens

to mean, not movement but that that the cook really likes the kitchen.

"You walked into the party, like you were walking onto a yacht"

=====================

"You walked in the party, like you were walking on a yacht"

Nah, just doesn't cut it!

Thank you both.

JTT, I haven't got "just doesn't cut it! "

'in' has motion.

The bird flew in the window
This setence describes the position of the bird. the bird is inside the window. I would read this immediatly as the window was open and the bird is inside the room.


The bird flew into the window
This sentence describes how the motion of the bird is being stoped at the window. I would read this as the window was closed and the bird flew into it.


The restaurant owner walked into the kitchen.
Here the owner is moving from one room (or outside) to another.

The restaurant owner walked in the kitchen.
Here he is already in the kitchen (position) and walking around within that room.

"Just doesn't cut it" is slang for 'not good enough;.

No, it makes no attempt to describe the position of the bird, the existence of the bird in a given locale. The bird could also have flown out the window.

The bird ['the denoting "one we both know of"] flies in the [same meaning for 'the' here] window everyday.



Are you suggesting that,

The restaurant owner walked in the kitchen.

is not possible to suggest entry into the kitchen, DadP, that it can only have the meaning you have suggested?

Other approaches may be:

the cook is interested in kitchens, the cook has many interests in kitchens, the cook fancies kitchens; etc. if we let prepositions do their job then we tend to discover a more creative way of writing. This is rough example, of course.