The steps of pulp opening for maxillary premolars are as follows: ¢Ù The shape of pulp opening hole is long oval and subbell-shaped, and the buccal and lingual diameter is the distance between the midpoints of the buccal and lingual deltoid crest, and the width is 1/3 of the middistance of the mesial and distal diameter of the occlusal surface.¢Ú Drill down the middle of the occlusal surface, reach the deep dentin, and extend to the buccal and lingual side to the midpoint of the buccal and lingual deltoid crest.
Through the buccal or lingual pulp Angle, uncovering the top of the pulp chamber (the direction of the drill needle is consistent with the long axis of the tooth).
The pulp opening steps of lower premolars: ¢Ù the pulp opening hole is oval or oval in shape, located in the middle and lower part of the triangular crest of the occlusal cheek.
¢Ú Drill in the central part of the occlusal surface near the buccal tip, drill needle direction and the direction of the long axis of the tooth, has penetrated the pulp cavity, and then according to the thickness of the root canal, to clean the top of the pulp chamber, forming a hole.
Steps for mandibular molars to open pulp: ¢Ù the shape of the opening pulp cavity is a rectangle with blunt rounded corners, which is located in the middle 1/3 of the mesial and distal diameter of the occlusal surface. The mesial side of the cavity shape is slightly longer, and the distal side is slightly shorter. The buccal side of the cavity is on the lingual slope of the buccal tip, and the lingual side of the cavity is in the central sulcus.
¢Ú Drill under the maxillofacial central fossa, drill to the deep dentin in the proximal and buccal direction, form a rectangular fossa slightly smaller than the top of the pulp chamber, and then Pierce the distal or proximal pulp Angle, uncovering the top of the bone chamber.
(Using the ball drill to pull the method of uncovering the top of the medullary chamber) the position of the medullary cavity is in the buccal side of the buccal tongue to the midline to expose the medullary cavity.
Maxillary molar pulp opening steps: ¢Ù pulp opening hole shaped as a blunt round triangle.
¢Ú Drill down the central fossa with a cleft drill, drill to the deep dentin, extend to the buccal tongue to form a relatively long buccal tongue diameter of blunt circular triangle deep hole, through the medullary Angle at the mesial tip of the tongue, along the shape of the hole to remove the top of the medullary chamber.
