Splints and stress transmission to teeth: an in vitro experiment

Citation
M. Halachmi et al., Splints and stress transmission to teeth: an in vitro experiment, J DENT, 28(7), 2000, pp. 475-480
Citations number
26
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Dentistry/Oral Surgery & Medicine
Journal title
JOURNAL OF DENTISTRY
ISSN journal
0300-5712 → ACNP
Volume
28
Issue
7
Year of publication
2000
Pages
475 - 480
Database
ISI
SICI code
0300-5712(200009)28:7<475:SASTTT>2.0.ZU;2-U
Abstract
Objective. To determine the influence of hard and soft splints with two thi cknesses on the stress transmission to the tooth supporting the splint and the opposite tooth. Methods. Continuous vertical forces up to 500 N were applied to two opposit e first molar phantom teeth using a universal loading machine. Deformation was detected by strain gauges attached to the cervical area of the buccal a nd lingual aspects of the lower tooth. Strain, as a function of force, was collected and the slope, defined as the compliance (in mu S/N) of the syste m, was calculated. Results. The highest compliance was found with hard splints. When splints w ere constructed on the upper molar, the highest compressive compliance was registered on the buccal side (2.8 mu S/N) and tension compliance on the li ngual side (-0.35 mu S/N). When constructed on the lower tooth, the opposit e was found. Soft splints resulted in compression on both the buccal and li ngual sides when adjusted to the upper or lower tooth. A higher compliance was found on the buccal side (1.26 mu S/N), while on the lingual side, the values varied (0.48-0.78 mu S/N). Conclusions. Soft splints are more efficient in protecting teeth against th e damage of bending forces although there is an increase of compression for ces. The tooth opposing a hard splint is exposed to a higher risk of bendin g forces. (C) 2000 Elsevier Science Ltd. All rights reserved.