19 May 2025 : Laboratory Research
Impact of Margin Type and Material Choice on Stress Distribution in Endocrown Restorations: A 3D Finite Element Study
Kulashekar Reddy Nandalur
ABCEF 1*, Abdulkarim Hussain Alshehri ABEF 1, Hemant Ramesh Chourasia ABCE 2, Mohammed E. Sayed ABEG 1, Khurshid Ahmed Mattoo CDEF 1, Vinod Bandela ACEF 3, Huda Mohammad AlBodham CDEG 4, Ali Y. Alsaeed CDEG 5, Nisreen Nabiel Hassan ACDE 6, Firas K. Alqarawi ACDE 7, Abeer Ali Qahtani CDEG 8, Yaqoub Ahmed Ayyashi BEF 9, Muhannad Ali Masmali BEF 10, Mohamad Assad Aljabri BEF 9, Miad Ali Alasmary CEF 11
DOI: 10.12659/MSM.948308
Med Sci Monit 2025; 31:e948308
Table 1 Number of elements and nodes employed for designing various models of endocrowns with different specifications (margin, pulp chamber extension, occlusal thickness).
| Structures | Model designs | ||||||
|---|---|---|---|---|---|---|---|
| A | B | C | D | E | F | ||
| Specifications | M – Flat ButtPCE – 2 mmOT – 3 mm | M – Flat ButtPCE – 4 mmOT – 3 mm | M – 20° bevelPCE – 2 mmOT – 3 mm | M – 20° bevelPCE – 4 mmOT – 3 mm | M – ShoulderPCE – 2 mmOT – 3 mm | M – ShoulderPCE – 4 mmOT – 3 mm | |
| Dentine | Elements | 92762 | 82197 | 92267 | 83384 | 93909 | 84370 |
| Nodes | 20209 | 18182 | 20209 | 18393 | 20421 | 18472 | |
| Enamel | Elements | 8675 | 8340 | 2257 | 7604 | 5304 | 5250 |
| Nodes | 2558 | 2450 | 7634 | 2295 | 1953 | 1939 | |
| Periodontal ligament | Elements | 14297 | 14297 | 14297 | 14297 | 14297 | 14297 |
| Nodes | 4869 | 4869 | 4869 | 4869 | 4869 | 4869 | |
| Cortical bone | Elements | 80172 | 80172 | 80172 | 80172 | 80172 | 80172 |
| Nodes | 18393 | 18393 | 18393 | 18393 | 18393 | 18393 | |
| Cancellous bone | Elements | 28385 | 28385 | 28385 | 28385 | 28385 | 28385 |
| Nodes | 6382 | 6382 | 6382 | 6382 | 6382 | 6382 | |
| Resin cement | Elements | 25884 | 15715 | 25884 | 15715 | 25884 | 15715 |
| Nodes | 5797 | 3626 | 5797 | 3626 | 5797 | 3626 | |
| Endocrown | Elements | 18072 | 21390 | 19290 | 23033 | 19915 | 23491 |
| Nodes | 4317 | 5048 | 4608 | 5464 | 4865 | 5639 | |
| Gutta percha | Elements | 16684 | 16684 | 16684 | 16684 | 16684 | 16684 |
| Nodes | 4578 | 4578 | 4578 | 4578 | 4578 | 4578 | |
| Total | Elements | 284931 | 267180 | 279236 | 269274 | 284550 | 268364 |
| Nodes | 67103 | 63528 | 72470 | 64000 | 67258 | 63898 | |
| M – margin type; PCE – pulp chamber extension; OT – occlusal thickness; CAD – computer assisted/aided diagnosis. Model descriptions: model A = flat butt margin +2 mm PCE +3 mm OT; model B = flat butt margin +4 mm PCE + 3 mm OT; model C = 20° bevel margin +2 mm PCE +3 mm OT; model D = 20° bevel +4 mm PCE +3 mm OT; model E = shoulder margin +2 mm PCE +3 mm OT; model F = shoulder margin +4 mm PCE +3 mm OT. | |||||||