For lower premolars, the purpose of inclining the handpiece lingually is to.. Avoid buccal pulp horn

For lower premolars, the purpose of inclining the handpiece lingually is to:

• A- Avoid buccal pulp horn***
• B- Avoid lingual pulp horn.
• C- Remove unsupported enamel.
• D- Conserve lingual dentine.

The correct answer is: A. Avoid buccal pulp horn.

Here's why:

• The buccal pulp horn is a projection of the pulp chamber located on the buccal (cheek) side of the lower premolar tooth.
• Lingually inclining the handpiece means tilting it towards the lingual (tongue) side.
• By inclining the handpiece lingually, the dentist can angle the bur away from the buccal pulp horn, reducing the risk of accidental exposure or perforation during preparation.

While the other options might be applicable in specific situations, they are not as generally relevant in this context:

- Option B:

The lingual pulp horn is less prominent than the buccal horn in lower premolars, and avoiding it wouldn't necessarily require lingual angulation.

- Option C:

Removing unsupported enamel might be a goal during preparation, but it's not the primary reason for lingual angulation.

- Option D:

Conserving lingual dentine is desirable, but again, it's not the main purpose of lingual angulation in this specific scenario.

Therefore, considering the location of the buccal pulp horn and the purpose of avoiding its exposure, angling the handpiece lingually is primarily for avoiding the buccal pulp horn in lower premolars.