Extraction of molar results in loss of proximal support which causes gradual shifting of adjacent teeth into extraction space, thus creating open proximal contact
distal to distal tooth and mesial to mesial tooth.
Any restoration that does not comply with certain morphological elements in relation to the marginal periodontium coating (restoring proximal contact
, aperture, crown shape, cervical marginal adaptation) and periodontal support (harmonious occlusal reports) may have periodontal iatrogenic potential.
Growth of the ulna and the radius takes place at the same time, (12) and loss of proximal contact
between them, therefore, produces alterations in their morphology.
The patient criteria for the MCB matched that of the regional board, including: a quadrant with at least 6 natural teeth, including one permanent molar with a proximal contact
; a minimum of 12 surfaces with heavy, subgingival calculus; a maximum of 6 deposits on anterior teeth; and no gross decay, probing depths greater than 6 mm, or other dental conditions that would interfere with calculus detection or removal.