Digital Image Correlation and Strain Gauges to Map and Compare Strain in Teeth with Different Quantity and Quality of Remaining Tooth Structure

Abstract

Method: 80 MOD preparations were carried out in human maxillary premolas. 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.

Digital image correlation in dental materials and related research: A review

“…7) [86] . Another limitation of the conventional two-dimensional DIC technology is that only inplane deformation can be measured when a single camera is used [88]. For this purpose, in recent years, the 2D DIC is extended to three-dimensional digital image correlation (3D DIC) technique through two cameras which can allow for measuring the spatial deformation and visualization of the target material [89] (Fig.…”

A Preliminary In Vitro Study of 3D Full-Field Strain Distribution in Human Whole Premolars Using Digital Image Correlation

“…Therefore, understanding the relations between the strain distribution of the whole tooth and its structure is a challenge [ 5 ]. Pointwise measurements, such as those provided by strain gauges [ 6 ], are sometimes not sufficient to fully monitor an experiment. Bioengineering tools [ 7 ] such as finite elements analysis (FEA) [ 8 , 9 , 10 , 11 , 12 , 13 ], moiré interferometry (MI) [ 14 , 15 , 16 , 17 ], electronic speckle pattern interferometry (ESPI) [ 18 , 19 , 20 , 21 ], and DIC [ 22 , 23 , 24 , 25 , 26 , 27 , 28 , 29 , 30 ] have been widely used in studying the mechanics of tooth or dental material.…”