tooth fracture

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tooth fracture
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Etiology
??????,????????????? be impacted by force,biting
hard food.
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Clinic characteristics
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Crown fracture
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Root fracture
Crown-root fracture
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?? crown fracture
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Anterior tooth horizontal or inclined
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Posterior teethinclined or vertical
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?? root fracture
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? 1/3??? 1/3??? 1/3
cervix-thirds,middle-thirds,apical-thirds
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????????????? 3859
?????????2024,???????????
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X???????????
Diagnosis can be carried out by radiographic
examination
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??? crown-root fracture
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The fracture will often be inclined with pulp
exposure
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?? Treatment
?? crown fracture
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Without dentin exposure,selective grinding of the
incisal edge is sufficient.
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Cover with Ca(OH)2 and composite resin
restoration if dentin is expose and sensitive
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In case of a pulp exposure,pulpectomy is
indicated if the root apical is
developed,pulpotomy is sufficient if the root
apical is developing.
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?? root fracture
??1/3?,??1/3? middle-thirds,apical-thirds
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Reposition the coronal fragment and use splinting
for 3 months
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Check for pulpal complications after 1 month,3
months,6 months and 12 months.If pulp necrosis
occurs,root canal therapy should be done.
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?1/3?????????
Cervix-thirds fractureroot canal therapy should
be done
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If fracture surface above gingival level,a
post-retained full crown is fabricated after RCT.
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Fracture surface between gingival and alveolara
post-retained crown is fabricated after
gingivectomy expose the fracture surface.
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If fracture surface is 4mm below the alveolar and
the root length is enough ,surgical or
orthodontic extrusion of the root ,to move the
fracture surface to amore optimal location for
final restoration
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Composite resin splint
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Healing of root fracture
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Calcified healing
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Connective tissue healing
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Hard-connective tissue union healing
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The fragment is separated by chronic inflammation
tissue
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?????crown-root fracture
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The tooth with crown-root fracture which can be
restored by a post retained full crown should be
saved to receive RCT
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vertical root fracture
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Vertical root fracture, not involving the crown.
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Etiology
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Chronic durative traumatic occlusal force
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Defect of root development
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Pulpless tooth
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Pulpless tooth
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Clinic characteristics
X???????????????
Diagnosis can be carried out by radiographic
examination
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Treatment
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The tooth should be extracted if it is very loose
or of severe periodontal lesion or vertical root
fracture in single rooted tooth.
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Tooth hemiresection or root resection is
performed after RCT if the molar is steady and of
limited periodontal lesion.
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???? tooth hemiresection
??? root resection
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wedge-shaped defect
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Wedge-shaped defect is caused by tardy abrasion
of buccal cervix hard tissues.
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Etiology
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Improper teeth brushing
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Structure of tooth cervix
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Acid erosion
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Weariness of hard tissues
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Clinic characteristics
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Usually have 2 or 3 surfaces,hard and
smooth,tooth-like color?
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Be classified with shallow,deep and pulp exposure
according to the depth of the lesion
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Most commonly occur on the buccal surface of
bicuspids symmetrically and accompany with
gingival recession
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The sizes of abrasions increase with age
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Treatment and prevention
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Correct tooth brushing
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Careful observation if there is no tooth
sensitivity and the lesions are small
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Desensitization with medicine or laser if there
is dentin hypersensitive
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Fillings if the lesions are extension
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Root canal therapy is performed if there is
pulpitis or periapical periodontitis.
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Root canal therapy or extraction are performed if
tooth fracture is occurred.
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cracked tooth
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Fine non-physiological crack on the surface of
the crown
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Etiology
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Weak tache of tooth structure
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Big cuspid pitch
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Traumatic occlusal force
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Clinic characteristics
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Most commonly occur on maxillary molar, and
secondly on mandibular molar.The crack occurs on
first molar is more than that on second molar.
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Cracked line
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maxillar
mandibular
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Treatment
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Occlusal adjustment
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Balance occlusal force
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Treat the cracked tooth
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??????(dentine hypersensitivity)????????(hypersens
itive dentine),?????????,????????
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Etiology
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???? Pathogenesis
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2.??????????????????????????,????????????,????
1.????????????????,??????????????
3.????????????????????????????,??????????,???????
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Clinic characteristics and diagnosis
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Exploration
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Temperature test
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3???????????
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Subjective evaluation
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Verbal rating scale,VRS
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Visual analogue scale,VAS
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Treatment
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Seal the dentinal tubule to decrease or avoid the
flowing of the liquid inside dentin
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medication
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Laser
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Restoration
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Abrasion
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Clinic characteristics
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Pathological change
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Physiological meaning
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Syndrome
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Treatment
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Bruxism
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Etiology
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Clinic characteristics
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Treatment
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Erosion
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Etiology
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Clinic characteristics
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Treatment and prevention
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