Gingival Buccal Sulcus (Gingivobuccal Sulcus / Mucobuccal Fold)

Anatomy and Definition

• Normal depth: 2-3 mm in a healthy individual
• Depths greater than 3 mm are considered a periodontal pocket, indicating pathology
• The depth is measured clinically with a periodontal probe and serves as the primary indicator of periodontal disease
• • Roberts and Hedges' Clinical Procedures in Emergency Medicine, p. 1661

• The oral vestibule is bounded anteriorly by the lips, laterally by the cheeks, and internally by the teeth and alveolar processes of the maxilla and mandible
• The gingiva reflects on to the lips and cheeks forming the fornix, which has freely movable mucous membrane
• This junction is also called the mucogingival junction
• • Color Atlas of Human Anatomy, Vol. 2, p. 244-245

Histology

• • Histology: A Text and Atlas (Pawlina), p. 1462-1463

Clinical Significance

1. Periodontal Assessment

• • Scott-Brown's Otorhinolaryngology, Head & Neck Surgery

2. Dental Nerve Blocks (Local Anesthesia)

• The lip is retracted to make tissues taut (down-and-out for maxillary, up-and-out for mandibular teeth)
• The needle is inserted at the mucobuccal fold with the bevel facing the tooth, inserted just a few millimeters
• The anesthetic diffuses through the periosteum to the tooth apex
• Also used for the infraorbital nerve block - the needle is directed through the mucobuccal fold over the maxillary second bicuspid, aimed at the infraorbital foramen
• • Roberts and Hedges' Clinical Procedures in Emergency Medicine, p. 657-658

3. Surgical Access - Incisions

• • Scott-Brown's Otorhinolaryngology; Mulholland and Greenfield's Surgery

4. Oral Cancer

• • Sabiston Textbook of Surgery; Scott-Brown's Otorhinolaryngology

5. Pathological Changes

• Crohn's disease: Linear ulcers in the depth of the buccal sulcus are a classic oral manifestation
• Tobacco-related lesions: Mucosal changes, erythroplakia, and carcinoma develop in sites where tobacco is habitually placed
• Gingivitis/Periodontitis: Inflammation leads to deepening of the sulcus into a true periodontal pocket

Summary

• A landmark for dental injections (supraperiosteal blocks, infraorbital blocks)
• A standard surgical incision site for facial and oral procedures
• A site for oral cancer subsites in the TNM staging system
• A zone whose depth (when referring to the gingival sulcus proper) reflects periodontal health

SustaGlar - Insulin Glargine Injection IP (rDNA Origin)

What Is It?

Understanding the Pen Device

How to Use the SustaGlar Insulin Pen - Step by Step

Before You Start

1. Check the insulin - Look through the cartridge window. It should be clear and colorless. Do NOT use if it looks cloudy, colored, or has particles.
2. Check the expiry date on the box and pen label.
3. Remove the pen cap from the top.

Step 1 - Attach a New Needle

• Remove the protective tab from a fresh pen needle.
• Screw the needle firmly onto the pen tip (clockwise).
• Remove the outer and inner needle caps (keep the outer cap - you will need it to remove the needle safely after).

Step 2 - Prime the Pen (Air Shot)

• Dial 2 units on the dose knob.
• Point the pen upward and press the injection button.
• A small drop of insulin should appear at the needle tip.
• This removes air bubbles and confirms the pen is working.
• Repeat if no drop appears.

Step 3 - Set Your Dose

• Turn the dose dial to your prescribed number of units.
• The dose window will display the number clearly.
• If you dial past your dose, you can dial back down.

Step 4 - Choose Your Injection Site

• Rotate sites with each injection to prevent lipodystrophy (fat lumps under the skin).
• Clean the skin with an alcohol swab and let it dry.

Step 5 - Inject

• Pinch a fold of skin gently.
• Insert the needle at 90 degrees (straight in). For thin patients, 45 degrees may be used.
• Press the injection button all the way down and hold for 10 seconds before withdrawing - this ensures the full dose is delivered.
• Release the pinched skin.
• Do NOT rub the injection site.

Step 6 - Remove and Dispose of the Needle

• Replace the outer needle cap and unscrew the needle.
• Dispose of the needle in a sharps container.
• Never leave the needle on the pen during storage (this can cause leakage or air bubbles).
• Replace the pen cap.

When to Take It

• Insulin glargine is given once daily, at the same time every day (commonly at bedtime or in the evening, but the time should be consistent).
• It does NOT need to be given with meals (it is a basal/background insulin, not a mealtime insulin).
• • Katzung's Basic and Clinical Pharmacology, 16th Ed.

Storage Instructions

Medical Uses (Indications)

1. Type 1 Diabetes Mellitus (T1DM)

• • Katzung's Basic and Clinical Pharmacology, 16th Ed., p. 3757

2. Type 2 Diabetes Mellitus (T2DM)

• • Textbook of Family Medicine, 9th Ed.

3. Gestational Diabetes / Diabetes in Pregnancy

• • Creasy & Resnik's Maternal-Fetal Medicine

4. Perioperative Diabetes Management

• • The Washington Manual of Medical Therapeutics

How It Works (Mechanism of Action)

• Two arginine molecules are added to the B-chain C-terminal.
• Glycine replaces asparagine at position A21.
• This makes the molecule soluble at acidic pH (pH 4.0) in the pen, but when injected into the body's neutral pH tissue, it precipitates into microcrystals under the skin.
• These crystals slowly dissolve, releasing small amounts of insulin continuously over 24 hours - hence the "peakless" (flat, no spike) profile.
• • Katzung's Basic and Clinical Pharmacology, 16th Ed.

Advantages Over Older Insulins (e.g., NPH)

• • Textbook of Family Medicine, 9th Ed.; Lippincott Pharmacology

Side Effects and Precautions

Important Warnings

• Do NOT mix with any other insulin in the same syringe (the acidic pH of glargine will alter the action of other insulins).
• Do NOT inject into a vein or muscle - subcutaneous only.
• Dose adjustments needed during illness, surgery, pregnancy, or changes in activity level.
• Monitor blood glucose regularly.
• • Katzung's Basic and Clinical Pharmacology; Lippincott Pharmacology

Key Facts Summary

Important: Always use this medication exactly as prescribed by your doctor. Never adjust your dose without medical guidance. If you experience symptoms of low blood sugar (shakiness, cold sweat, confusion), take glucose immediately and inform your doctor.