Answer: (a)
A one-wall defect presents with either one proximal wall (hemiseptal) or one linguopalatal or buccolabial wall. These defects are generally not amenable to regenerative theraputic approaches. Resective therapy, with the goal of creating a physiologic osseous architecture, will provide a more predictable and stable long-term result.
Two-wall defects are bordered by either two proximal walls, a buccal/labial and proximal wall or a buccal/labial and a lingual wall. A two-wall defect consisting of a buccal/labial and a lingual/palatal wall is commonly referred to as an interdental or osseous crater. The adjacent teeth are the other two walls of the defect. According to a study by Manson and Nickolson, the interdental crater constitutes approximately one third of all intrabony defects and as many as two thirds of all mandibular defects.
Three-wall intrabony defects are characterized as having three osseous walls; the tooth surface constitutes the fourth wall. These defects may be localized to one proximal or midradicular surface, or may be circumferental, involving two or more root surfaces.
The typical clinical encounter is with a combination defect which combines two or more of the above.
Periodontal Therapy, Nevins and Mellonig, pp175,176
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