Ruling on using a screw made of gold for a man, to fix a tooth

The basic principle is that it is not permissible for men to
use gold, whether as an adornment or for medicinal purposes, except in cases
of necessity. 

If a specialist doctor thinks that treatment of the tooth,
whether by using a “bridge”, filling it or inserting a screw to fix it, can
only be done using gold, there is nothing wrong with that. But if it is
possible to treat the tooth just as well using some other material, then it
is not permissible to use gold, because of the report narrated by ‘Urfujah
ibn As‘ad (may Allah be pleased with him) who said: My nose was cut off on
the day of (the battle of) al-Kulaab during the Jaahiliyyah, so I had a nose
made of silver, but it began to smell bad, so the Messenger of Allah
(blessings and peace of Allah be upon him) told me to get a nose made of
gold.

Narrated by at-Tirmidhi, 1770; classed as saheeh by Shaykh
al-Albaani (may Allah have mercy on him) in Saheeh
at-Tirmidhi

An-Nawawi (may Allah have mercy on him) said: With regard to
the view of the author, that in cases of necessity it is permissible to use
gold, this is agreed upon (among the scholars). Our companions said: It is
permissible to use an (artificial) nose or tooth made of gold or silver;
similarly, putting fillings of gold and silver in teeth is permissible.

End quote from Sharh al-Muhadhdhab, 1/312 

It says in al-Mawsoo‘ah al-Fiqhiyyah, 11/121:

The fuqaha’ are unanimously agreed that it is permissible to
use a nose made of gold. The Malikis and Hanbalis, and Muhammad ibn al-Hasan
among the Hanafis, and the Shaafa‘is, said: (This also applies to) teeth.
And the Shaafa‘is added: fingertips. The Maalikis and Hanbalis also stated
that it is permissible to treat a tooth or teeth with gold. The basic
principle concerning that is the report about ‘Urfujah ibn As‘ad (may Allah
be pleased with him). … And al-Athram narrated from Moosa ibn Talhah, Abu
Jamrah ad-Dab‘i. Abu Raafi‘ ibn Thaabit al-Banaani, Ismaa‘eel ibn Zayd ibn
Thaabit and al-Mugheerah ibn ‘Abdullah, that they fixed their teeth with
gold.

End quote. 

It says in Fataawa al-Lajnah ad-Daa’imah (24/70): If
the dentist is skilled and thinks that it is better for you to have a tooth
made of gold rather than anything else, then it is permissible for you,
otherwise it is not. End quote. 

They also said (24/56): In cases of necessity it is
permissible to use gold to make an (artificial) tooth, nose and so on, if
nothing else could be used instead. End quote. 

Shaykh Ibn ‘Uthaymeen (may Allah have mercy on him) was asked
about the ruling on having gold teeth. 

He replied: It is not permissible for men to have gold teeth
except in a case of necessity, because it is haraam for men to wear gold or
use it as an adornment. In the case of women, if it is customary for women
to wear gold teeth, there is nothing wrong with that, and she may have her
teeth plated with gold, if that is a customary kind of beautification, and
does not constitute extravagance.

End quote from Majmoo‘ Fataawa wa Rasaa’il Ibn ‘Uthaymeen,
11/102 

Based on that: 

If the doctor who is treating you only used the screw made of
gold because nothing else could be used instead, or because it is better for
your teeth, there is nothing wrong with that. Otherwise it should be
removed, unless doing so will cause harm, in which case there is nothing
wrong with leaving it. 

And Allah knows best.