A male 25 years old presents to the dental clinic due to food lodgement in lower back region tooth. He also gives the history of previous dental treatments of other teeth as well. On examination it is revealed that interproximal caries is present between right mandibular molars. The clinician restores the tooth with amalgam.
The carving of the restoration can be done by which of the following ?
A discoid–cleoid instrument may be used to carve the occlusal surface of an amalgam restoration. The rounded end (discoid) is positioned on the unprepared enamel adjacent to the amalgam margin and pulled parallel to the margin. This removes any excess at the margin while not allowing the marginal amalgam to be carved below the preparation margins (i.e., “submarginated”).
The pointed end (cleoid) of the instrument may be used to define the primary grooves, fossae, and cuspal inclines. The Hollenback carver is also useful for carving these areas.The reproduction of grooves and fossae is necessary to provide appropriate mastication and sluiceways for the escape of food from the occlusal table. The mesial and distal fossae are carved to be inferior to the marginal ridge height, helping limit the potential for food to be wedged into the occlusal embrasure. Having rounded and relatively shallow occlusal anatomy also helps achieve a 90-degree amalgam margin on the occlusal surface and to ensure adequate occlusogingival dimension of the final amalgam restoration for strength.
Occlusal embrasure areas are developed with a thin explorer tip or carving instrument by mirroring the contours of the adjacent tooth. The explorer tip is pulled along the inside of the matrix band, creating the occlusal embrasure form.
Discoid–cleoid instrument
Hollenback carver
Thin explorer tip
Two of the above