Gum Anatomy



Periodontium is the tissue that immediately surrounds and supports the teeth. It consists of alveolar bone, periosteum, periodontal ligament, gingival sulcus, and gingiva; each of these components contributes to stabilizing the tooth within the jaws.

Alveolar bone

The alveolar bone is the bone that surround the teeth. When a tooth is removed, alveolar bone around the tooth will start to get resorbed. It is composed of cancellous bone, also known as spongy bone. It is located between cortical plates and is permeated by blood vessels and marrow spaces.


The periosteum is dense connective tissue attached to the outer surface of the bone.

Periodontal ligament

The tooth is anchored to alveolar bone by the attachment of the periodontal ligament to the periosteum and the cementum of each tooth root. The periodontal ligament follows the outline of the tooth root and extends superiorly to the base of gingival sulcus.


Cementum is a specialized calcified substance covering the root of a tooth.

Gingival sulcus

The gingival sulcus is line internally by a thin layer of epithelium cells called junctional epithelium. This epithelium provides the barrier to the ingress of bacteria. In healthy gum, the gingival sulcus is a crevice that is less than 3mm deep.

Periodontal pocket – gingival sulcus that extend deep down

A periodontal pocket is a gingival sulcus that has experienced apical (or downward) extension of the epithelial attachment beyond 3mm because of repeated inflammatory insults and poor oral hygiene. Although accumulation of bacterial plaque is the most important factor influencing the health  of the periodontium, position of the tooth within the arch, occlusal loading, parafunctional habits, appliances, drugs and frenal attachments also effect periodontal health and the development of periodontal pockets.

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Dr. Ng HW

About Dr. Ng HW

Dr. HW NG is a dentist and an oral & maxillofacial surgeon. BDS (MALAYA), MDFS.RCS (ENGLAND), MClinDent (Oral & Maxillofacial Surgery)(MALAYA) Dr. H. W. Ng is an oral & maxillofacial surgeon. He obtained his basic degree as a dental surgeon from University of Malaya in 2001 and become the member of the Faculty of Dental Surgery, The Royal College of Surgeons of England in 2006. He passed his master degree, MClinDent (Oral & Maxillofacial Surgery) from University of Malaya in 2009. Dr. H. W. Ng has more than 5 years of working experience as a general dental practitioner and he worked as a trainee oral & maxillofacial surgeon in a few centres in Klang valley, namely University Hospital, Hospital Tunku Ampuan Rahimah in Klang and Hospital Kuala Lumpur. Currently, he is the visiting Oral & Maxillofacial Surgeon in Columbia Asia Hospital in Bukit Rimau and Puchong, visiting oral surgeon in a few dental clinics in KL and a part-time lecturer in the Oral & Maxillofacial Surgery Department in Dental Faculty, International Medical University (IMU) in Bukit Jalil. His fields of interest are cosmetic dentistry, oral rehabilitation, dental implant and orthognathic (corrective jaw) surgery.

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