Cavity Prep Terminology in Conservative Den | Walls, Cavosurface Margins, Line Angles & Point Angles

Описание: Welcome to Smart Dental Academy, the hub for Conservative Dentistry and Operative Dentistry learning. In this lecture, we explore the complete terminology of cavity preparation, focusing on the definitions, types, and clinical importance of all cavity walls, line angles, point angles, and margins. This knowledge is fundamental for BDS, BS Dental Technology, and Diploma dental students.

🦷 Cavity Walls in Tooth Preparation
🔹 External Walls

Cavity walls that extend to the external tooth surface. These are named after the tooth surface they face:

Facial (Buccal) Wall – faces the cheek or lips

Lingual Wall – faces the tongue or palate

Mesial Wall – faces the midline of the dental arch

Distal Wall – faces away from the midline

Gingival Wall/Floor – in Class II & V preparations, located near the gingiva

🔹 Internal Walls

Cavity walls that do not extend to the external surface.

Pulpal Wall (Pulpal Floor) – horizontal wall perpendicular to the long axis of the tooth, adjacent to the pulp chamber (seen in occlusal preparations like Class I).

Axial Wall – vertical internal wall parallel to the long axis of the tooth, adjacent to the pulp (common in Class II, III, and V cavities).

🦷 Line Angles of Cavity Preparation

A line angle is formed by the junction of two cavity walls. They are named by combining the names of the two walls.

🔹 Common Line Angles in Posterior Teeth (Class I & II Preparations):

Mesiobuccal Line Angle

Mesiolingual Line Angle

Distobuccal Line Angle

Distolingual Line Angle

Bucco-occlusal Line Angle

Linguo-occlusal Line Angle

Mesiopulpal Line Angle

Distopulpal Line Angle

🔹 Common Line Angles in Anterior Teeth (Class III & V Preparations):

Mesiolabial Line Angle

Distolabial Line Angle

Mesiolingual Line Angle

Distolingual Line Angle

Linguogingival Line Angle

Labio-gingival Line Angle

Mesiogingival Line Angle

Distogingival Line Angle

🦷 Point Angles of Cavity Preparation

A point angle is formed by the junction of three cavity walls. These are also named by combining the three walls.

🔹 Common Point Angles in Posterior Teeth (Class I & II):

Mesiobucco-occlusal Point Angle

Distobucco-occlusal Point Angle

Mesiolinguo-occlusal Point Angle

Distolinguo-occlusal Point Angle

Mesiobucco-pulpal Point Angle

Distobucco-pulpal Point Angle

Mesiolinguo-pulpal Point Angle

Distolinguo-pulpal Point Angle

🔹 Common Point Angles in Anterior Teeth (Class III & V):

Mesiolabio-gingival Point Angle

Distolabio-gingival Point Angle

Mesiolinguo-gingival Point Angle

Distolinguo-gingival Point Angle

🦷 Cavosurface Margin

The junction between a cavity wall and the external surface of the tooth. Proper cavosurface angle design ensures strength, retention, and resistance of the restoration.

🦷 Classifications of Cavities (GV Black)

Class I Cavity – pits and fissures of molars, premolars, and lingual pits of anterior teeth

Class II Cavity – proximal surfaces of posterior teeth

Class III Cavity – proximal surfaces of anterior teeth (not involving the incisal edge)

Class IV Cavity – proximal surfaces of anterior teeth involving the incisal angle

Class V Cavity – gingival third of facial or lingual surfaces

Class VI Cavity – incisal edges of anterior teeth and cusp tips of posterior teeth

📚 Why This Matters for Dental Students

A clear understanding of cavity walls, line angles, point angles, and margins helps in:

Designing accurate Class I, II, III, IV, and V cavity preparations

Ensuring retention, resistance, and longevity of restorations

Improving clinical skills and exam performance

👩‍⚕️ Who Should Watch This Video?

BDS Students (Conservative Dentistry & Operative Dentistry)

BS Dental Technology Students

Dental Diploma Students

Anyone preparing for operative dentistry viva, exams, or practicals

At Smart Dental Academy, we make dental learning easy, exam-focused, and clinically relevant, without boring lectures.

🔔 Subscribe and explore the Conservative Dentistry playlist for more topics on:

Principles of Tooth Preparation

Cavity Design and Classification

Restorative Dentistry Terminology

Clinical Techniques for Cavity Restorations

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