Alhamdan, M;
Knowles, J;
McDonald, A;
(2019)
Digital Image Correlation and Strain Gauges to Map and Compare Strain in Teeth with Different Quantity and Quality of Remaining Tooth Structure.
International Journal of Prosthodontics
, 32
(1)
10.11607/ijp.6044.
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Abstract
OBJECTIVES: The purpose of this in vitro study was to evaluate strain in teeth with differing tooth surface loss utilising: The surface displacement field measured using Digital Image Correlation (DIC), and Strain Gauges (SG). METHODS: 80 MOD preparations were carried out in human maxillary premolars. 10 sound premolars served as control (Control). Samples were divided into 2 groups (n=40) according to the composition of the prepared walls, composed of either enamel and dentine (E+De) or dentine only (De). Each group was then divided into 4 subgroups (n=10) according to the selected cusp height to width ratio (H:W), (A=2:1mm, B=3:1mm, C=3:1.5mm, D=4.5:1.5mm). The samples were uniaxially loaded to 130N where strain was recorded with (DIC) and (SG). RESULTS: With SG testing, Control samples recorded the lowest strain values and were significantly different from all test groups. However, DIC failed to detect strain in Control samples as it was too low. With DIC, group D showed the lowest strain readings among all dimension groups with significant difference from groups A and B. However, the composition of the remaining tooth structure did not show any significant effects. While with strain gauge testing, remaining wall dimension and composition had a significant effect. Group A scored the highest strain at all compositions. E+De had better resistance to load stresses than De only. CONCLUSIONS: For both testing methodologies, height (≥3mm) and width (1-1.5mm) of the remaining tooth structure had an effect on strain. Tooth compositions of (E+De) resisted strain better than (De) counterparts at all dimensions.
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