In order to avoid these issues, some clinicians place miniscrews extraradicularly in the buccal shelf area or in the retromolar area [8, 9].
Roberts, "Primary failure rate for 1680 extra-alveolar mandibular buccal shelf mini-screws placed in movable mucosa or attached gingiva," Angle Orthodontist, vol.
For the mandible, the primary stress-bearing area is buccal shelf area and relieving area is a sharp mylohyoid ridge and the crest of alveolar ridge.
6 round bur in the palatal region, and 1 mm thick base-plate wax covers mandibular ridge except buccal shelf area and retromolar pad (Figure 1) .
[sup], At the same time, the results indicated that the mucosa was thicker in the M region of B side (buccal shelf area) compared with other alveolar ridge regions of B sides.
With the V-shaped ridge, that ridges may be quite narrow buccolingually, the wax spacer should also cover the ridge crest and make buccal shelf stops that will provide stability to the mandibular tray during the final impression making.
The buccal shelf
areas were inadequate in size to provide the denture with support.