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DENTURE FRACTURE

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This is the commonest cause of a midline fracture of a complete upper denture. A very tiny crack forms at the point of concentrated stress. – PowerPoint PPT presentation

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Title: DENTURE FRACTURE


1
DENTURE FRACTURE REPAIR
Assist Lecturer Rajaa M. Al-Mossawi Collage of
Dentistry/University of Kufa
2
TECHNICALLY
  • Dentures can fracture in one of two ways
  • By IMPACT where one hard blow results in instant
    breakage
  • By FATIGUE when the denture base is subjected to
    repeated stresses.

3
IMPACT FRACTURE
  • An impact fracture is usually caused by patient
    carelessness or accident.

4
CARELESSNESS
IMPACT FRACTURE
5
FATIGUE
  • The continual application of forces which are
    themselves too small to cause fracture directly,
    when applied over a long period, can cause the
    acrylic resin to fatigue.
  • This is the commonest cause of a midline fracture
    of a complete upper denture.
  • A very tiny crack forms at the point of
    concentrated stress.
  • It grows slowly at first, and then the rate of
    growth increases greatly just before the fracture
    occurs.

6
FATIGUE FRACTURES
  • May be associated with
  • (1) The design of the denture
  • (2) Oral anatomy of the patient.
  • (3) Its use or abuse by the patient.
  • (4) Factors introduced in the laboratory.
  • (5) Previous repairs.

7
STRESS CONCENTRATORS DUE TO DESIGN.
  • A "U" shaped denture designed

8
STRESS CONCENTRATORS DUE TO DESIGN.
  • Non-flanged or open-faced denture

9
STRESS CONCENTRATORS DUE TO DESIGN.
  • A large diastema between the anterior teeth.

10
STRESS FACTORS DUE TO PATIENTS BEHAVIOUR
  • As a result of prolonged use of abrasive cleaners
    and vigorous brushing over many years acrylic
    resin will wear very thin and therefore become
    very prone to fatigue.

11
STRESS FACTORS DUE TO PATIENTS BEHAVIOUR
  • This denture has become bleached and very thin
    with long-term cleaning and wear.

12
Factors Introduced In The Laboratory
  • -The wax base of the trial denture too thin.
  • -During the packing of the acrylic into the
    processing flask

-
13
STRESS FACTORS DUE TO THE ORAL ANATOMY OF THE
PATIENT
upper denture with a high vaulted palate
14
Torus Palatinus
15
HEAVY BITE
16
BRUXISTS
17
STRESS DUE TO PREVIOUS REPAIRS
18
Technical procedure
19
THANK YOU
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