MAXILLARY SINUS AND
ITS DENTAL IMPLICATIONS
By: Eman Al-Qahtani
Supervised By : Dr.Shereen Shokry
• Anatomy and Development
• Relation between maxillary sinus and dental structures
• How maxillary sinus is affected by dental procedures
• Dental implants in Maxilla
• Maxillary Sinus Infections
• Cystic Lesions and Benign tumors
• Malignant Tumors
• How maxillary sinus affects the dental structures
ANATOMY AND DEVELOPMENT :
The maxillary sinus is part of a
series of paranasal sinuses.
And it is the first of the paranasal
sinuses to develop in the 3rd
month of fetal life
.Final growth of the maxillary sinus
takes place between 12 and 14
years of age and corresponds
with the eruption of the
permanent teeth and growth of
the alveolar process of the upper
RELATIONSHIP BETWEEN THE ROOTS OF
THE MAXILLARY TEETH AND THE
• Many studies investigated the relationship between the roots of the maxillary
molars and the maxillary sinus using computed tomography ,
• They found that the apex of the mesiobuccal root of the maxillary 2nd molar
was closest to the sinus floor (mean distance of 1.97 mm)
• And the apex of the buccal root of the maxillary first premolar was furthest
from the sinus floor (Mean distance of 7.5 mm)
FUNCTIONS OF MAXILLARY SINUS
• 1- Speech and voice resonance
• 2- reduce the weight of the skull
• 3- warmth inhaled oxygen
• 4-filtration of the inspired air
• 5- immunological barrier
• 6- regulation of intra nasal pressure
MAXILLARY SINUSITIS OF DENTAL
Spread of infection from
periapical or PDL
Overextention of dental
cements ,Gp or silver
Iatrogenic cause like
perforation of sinus
membrane by an
implant or left broken
HOW MAXILLARY SINUS IS AFFECTED
BY DENTAL PROCEDURES
• A- Proximity of The maxillary Teeth to the Maxillary Sinus :
• The roots of the maxillary premolars and molars , are consistently
located below the sinus floor , followed in frequency by the roots of
the first molar ,third molar , second premolar , first premolar and
• Oro-maxillary sinus perforation occurs occasionally at the
extraction of a maxillary tooth, and it may be a cause of
maxillary sinusitis or antro-oral fistula
most commonly complication of maxillary
premolar molar tooth extraction.
We treat this case surgically by Buccal Flap .
IMPLANTS IN THE MAXILLA :
• In the maxilla, 7 millimeters of bone height is sufficient to
accommodate short implants. However, the use of 7–10 mm long
implants is a greater concern in the maxilla than the mandible
because the implant failure rate is higher in the
maxilla. Therefore, 13 mm is the recommended minimum
occlusocervical bone dimension in the maxilla.
• In case we don’t have enough Bone height we go for sinus lift,which
is a surgical procedure which aims to increase the amount of bone
in the posterior maxilla
The expansion of the sinus was larger following
extraction of several adjacent posterior
teeth, and extraction of 2nd molars ,If dental
implant placement is planned in these
cases, immediate implantation and/or
immediate bone grafting should be considered
to assist in preserving the 3-dimensional bony
architecture of the sinus floor at the extraction
• Radiography is the most important supplementary investigation to clinical
examination of the sinuses
• Intra-Oral :
Waters view (Occipitomental view)
• Lateral Occlusal
CT SCAN AND MRI :
• These have become increasingly important for the evaluation of sinus
ODONTOGENIC CYSTIC LESIONS
OF THE MAXILLA
Odontogenic cysts are the most common group of extrinsic lesions that
encroach on the maxillary sinuses. The cyst enlarges ,the sinus decrease in
size .The result is radio-opaque line between the cyst and the air space of the
Cysts involving maxillary sinus :
- Radicular cyst
- Dentigerous cyst
- Mucous retention cyst
- Odontogenic Keratocyst
RADICULAR CYST :
Maxillary sinusitis caused by an apical inflammatory
lesion (probably, a granuloma) at the root apices of
the 2nd molar
- NOTICE the cloudiness ( Radio-opacity) of the sinus
DENTIGEROUS CYST :
• Called by a (follicular cyst) too.2nd
most common cyst , it usually
appear on the impacted
maxillary 3rd molar
MUCOUS RETENTION CYSTS :
• Mucous retention cysts in the sinuses are very common, they are expansile
and potentially destructive lesions
ODONTOGENIC KERATOCYST :
• OKCs are derived from
the remnants of the
dental lamina. An OKC is
an odontogenic lesion ,
which usually presents
incidentally on a dental
radiograph as a
with an impacted tooth.
PERIODONTAL DISEASE :
• Maxillary sinusitis caused by apical infection
and extensive periodontal lesions involving the
• Molars and premolars
• NOTICE the cloudiness (Radio-opacity) of the
ODONTOGENIC TUMOR :
• Fibrous Dysplasia :
• Fibrous dysplasia is the most common disease of the jaws to
manifest a ground-glass radiographic pattern.
• They are Invasive and destructive lesions
• For Examples :
• Squamouse cell carcinoma
CAN SINUSITIS CAUSE DENTAL
• One of the most common symptoms of any type of sinusitis is pain, and the
location depends on which sinus is affected.
• If Pain is in the patient’s upper jaw and teeth, with tender cheeks, may mean
the patient’s maxillary sinuses are involved.
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