Max Sinus

Question 1

The posterior wall of max sinus

Answer 1

The posterior wall formed by the infratemporal surface of the maxilla.

Question 2

How many openings of max sinus

Answer 2

An accessory ostium may occur in a lower level than the ostium maxillare

Question 3

Shape of sinus with age

Answer 3

• tubular at birth
• ovoid at childhood
• pyramidal at adulthood

Question 4

Time of beginning of formation of max sinus and its size early and late

Answer 4

At 3-4 MIU.
• At birth :8x4x6 mm (Pneumatization)
• Adult: • 2.3 cm.(T) • 3.4 cm.(AP) • 3.3 cm.(V) • Total Capacity :15 ml

Question 5

MucosaThickness difference between max sinus and nasal cavity

Answer 5

Max sinus mucosa is thinner

Question 6

Origin of sinus epi

Answer 6

Olfactory epi of Middle nasal meatus

Question 7

Additional cells of max sinus

Answer 7

Additional cells- basal cells, columnar non-ciliated cells, goblet cells

Question 8

Histology of lamina propria of max sinus

Answer 8

The lamina propria of the sinus mucosa is fused with the periostium of the underlying bone and consists of loose bundles of collagenous fibers with very few elastic fibers. It is moderately vascular. Mixed glands of the mucous and serous types are present.

Question 9

Antral salivary glands

Answer 9

Mucous and serous found in lamina propria of max sinus

Question 10

Lymph drainage of max sinus

Answer 10

Lymph drainage

1. Submandibular lymph nodes
2. Deep cervical lymph node 3. Retro pharyngeal lymph nodes

Question 11

Arterial supply of max sinus

Answer 11

Arterial supplyBranch of third part of maxillary artery(pterygopalatine part) 1. Posterior superior alv artery 2. Infra-orbital artery 3. Greater palatine artery.

Question 12

Venous drainage of max sinus

Answer 12

Venous drainage1.Anteriorly- Facial vein

2.Posteriory- Pterygoid venous plexus

Question 13

Functions of max sinus usually forgotten

Answer 13

• Producing bactericidal lysozyme to the nasal cavity and protection against bacterial infection.
• ) enhancing the facio-cranial growth
• Contributing in olfactory sense
• Assisting in regulating intranasal pressure
• Providing thermal insulation to important tissues

Question 14

Arrangement of closeness of relation of teeth to max sinus

Answer 14

6,7,5,4,8,3

Question 15

Sinus pneumatisation

Answer 15

Maxillary sinus perforation occurs occasionally during the extraction of a maxillary tooth, and it may be a cause of maxillary sinusitis or oro- antral fistula.
• The chances of creating an oro-antral fistula in patient less than 15 yrs are comparatively lesser than in adults due to incomplete development of sinus.
• The distance between apical end of maxillary posterior teeth and floor of sinus is approximately 1-1.2 cm. In some cases the gap may be still lesser.