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5
Braz Dent Sci 2023 July/Sept;26 (3): e3770
Martins PRV et al.
The influence of the retention feature in artificial teeth on its attachment to the thermoplastic resin denture base
Martins PRV et al. The influence of the retention feature in artificial teeth on its
attachment to the thermoplastic resin denture base
By procedural determinant of the study, all
experimental teeth were dislodged completely or
suffered catastrophic fracture (Figure 6). Despite
the deformation of the polymer socket when the
the articial teeth were displaced, there was no
apparent fracture of the material in the contour
of the tooth or in the place where the retention
was made. Mechanical retentions improved
ARAT fixation to acrylic resin denture bases,
although it should be noted that the latter feature
has a vertical orientation and no horizontal
component [9]. However, Takakusaki et al.
(2022) did report good results for composite
artificial teeth retention in TR denture bases
with a similar retentive form [11]. Our results
indicate that the groove (horizontal) retention
demonstrated consistently higher means for
resistance (GIII - p<0,05). It is also interesting
that all of the specimens in the control group
(GI) were dislodged cleanly while the teeth with
groove retention were fractured in their respective
sockets. In those specimens with the hole type
feature (GII), teeth did not fracture suggesting
even though exhibiting better resistance than the
control group, the retentive feature could not
prevent the dislodgment.
The mean failure loads of GII and GIII
were 140 N and 206 N, respectively. These
values were signicantly higher than those of
the control group (119 N). All the experimental
groups showed a mean value higher than 110N,
which is the minimum bonding strength expected
for a maxillary central incisor artificial tooth
and an acrylic denture base resin, according
to ISO 3336:1993 [12]. According to some
authors [13,14], the maximum occlusal force at
the anterior teeth is approximately 100–200 N.
Therefore, the failure loads observed in this study
are clinically acceptable and would be able to
support the masticatory function.
Lateral and Central incisors presented no
statistically signicant results when comparing
GI and GII. It has been reported that the hole
diameter of the retentions might inuence bond
strength of the articial [3], therefore an analysis
with different sizes of burs might be necessary.
In order to improve retention of articial
teeth to TR, more studies on the subject are
required. Studies with different materials for
both tooth and denture base, as well as different
retention formats and sizes.
CONCLUSION
Since there is no chemical interaction
between TR and ARAT, the material requires
additional forms of retention. The data in this
study indicates that a groove placed on the
articial tooth offers signicantly better retention
efcacy to the point where the displacement was
only possible after its fracture.
Author’s Contributions
PRVM: Methodology, Validation,
Investigation. MKM: Conceptualization,
Methodology, Design of the study, Data
Curation, Writing – Review & Editing. BC:
Data interpretation, Formal analysis, Writing
– Review & Editing. CMI: Writing – Original
Draft Preparation, Writing – Review & Editing.
RCS: Conceptualization, Methodology, Design
of the study, Data Curation, Writing – Review
& Editing.
Conict of Interest
No conicts of interest declared concerning
the publication of this article.
Funding
The authors declare that no nancial support
was received.
Regulatory Statement
Not applicable.
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