Abstract
Objective: To evaluate in vitro the pre-cementation resistance of CAD/CAM onlays subjected to functional occlusal tapping. Methods: An extracted tooth model (molar and premolar) with simulated bone and periodontal ligament was used to make a mesio-occlusal onlay preparation (two mesial cusps covered). Immediate dentin sealing was applied to the prepared tooth. The corresponding onlays were fabricated with Cerec either using composite resin (Paradigm MZ100) or ceramic (e.max CAD and Mark II) (n = 14). An elevated marginal ridge was designed with the intention of generating hyper-occlusion. Pre-cementation occlusal tapping was simulated using closed-loop servo-hydraulics at 2 Hz, starting with a load of 40 N, followed by 80, 120, 160, 200, 240 and 280 N (10 cycles each). All samples were loaded until fracture or to a maximum of 70 cycles. Groups were compared using the life table survival analysis (p =.016, Bonferroni method). Results: Survival probability was MZ100 > e.max CAD > Mark II. The restorations made from e.max CAD and Mark II failed at an average load of 157 N and 123 N, respectively with no specimen withstanding all 70 load cycles (survival 0%); with MZ100 the survival rate was 36%. Significance: Material selection has a significant effect on the risk of CAD/CAM onlay fracture during pre-cementation functional occlusal tapping with composite resin onlays showing the minimum risk compared to ceramic ones.
| Original language | English (US) |
|---|---|
| Pages (from-to) | 942-947 |
| Number of pages | 6 |
| Journal | Dental Materials |
| Volume | 27 |
| Issue number | 9 |
| DOIs | |
| State | Published - Sep 1 2011 |
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Keywords
- CAD/CAM
- Ceramic
- Composite resin
- Occlusal tapping
- Onlay
- Try-in
ASJC Scopus subject areas
- Materials Science(all)
- Dentistry(all)
- Mechanics of Materials
Cite this
Risk of onlay fracture during pre-cementation functional occlusal tapping. / Magne, Pascal; Schlichting, Luis H.; Paranhos, Maria P G.
In: Dental Materials, Vol. 27, No. 9, 01.09.2011, p. 942-947.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Risk of onlay fracture during pre-cementation functional occlusal tapping
AU - Magne, Pascal
AU - Schlichting, Luis H.
AU - Paranhos, Maria P G
PY - 2011/9/1
Y1 - 2011/9/1
N2 - Objective: To evaluate in vitro the pre-cementation resistance of CAD/CAM onlays subjected to functional occlusal tapping. Methods: An extracted tooth model (molar and premolar) with simulated bone and periodontal ligament was used to make a mesio-occlusal onlay preparation (two mesial cusps covered). Immediate dentin sealing was applied to the prepared tooth. The corresponding onlays were fabricated with Cerec either using composite resin (Paradigm MZ100) or ceramic (e.max CAD and Mark II) (n = 14). An elevated marginal ridge was designed with the intention of generating hyper-occlusion. Pre-cementation occlusal tapping was simulated using closed-loop servo-hydraulics at 2 Hz, starting with a load of 40 N, followed by 80, 120, 160, 200, 240 and 280 N (10 cycles each). All samples were loaded until fracture or to a maximum of 70 cycles. Groups were compared using the life table survival analysis (p =.016, Bonferroni method). Results: Survival probability was MZ100 > e.max CAD > Mark II. The restorations made from e.max CAD and Mark II failed at an average load of 157 N and 123 N, respectively with no specimen withstanding all 70 load cycles (survival 0%); with MZ100 the survival rate was 36%. Significance: Material selection has a significant effect on the risk of CAD/CAM onlay fracture during pre-cementation functional occlusal tapping with composite resin onlays showing the minimum risk compared to ceramic ones.
AB - Objective: To evaluate in vitro the pre-cementation resistance of CAD/CAM onlays subjected to functional occlusal tapping. Methods: An extracted tooth model (molar and premolar) with simulated bone and periodontal ligament was used to make a mesio-occlusal onlay preparation (two mesial cusps covered). Immediate dentin sealing was applied to the prepared tooth. The corresponding onlays were fabricated with Cerec either using composite resin (Paradigm MZ100) or ceramic (e.max CAD and Mark II) (n = 14). An elevated marginal ridge was designed with the intention of generating hyper-occlusion. Pre-cementation occlusal tapping was simulated using closed-loop servo-hydraulics at 2 Hz, starting with a load of 40 N, followed by 80, 120, 160, 200, 240 and 280 N (10 cycles each). All samples were loaded until fracture or to a maximum of 70 cycles. Groups were compared using the life table survival analysis (p =.016, Bonferroni method). Results: Survival probability was MZ100 > e.max CAD > Mark II. The restorations made from e.max CAD and Mark II failed at an average load of 157 N and 123 N, respectively with no specimen withstanding all 70 load cycles (survival 0%); with MZ100 the survival rate was 36%. Significance: Material selection has a significant effect on the risk of CAD/CAM onlay fracture during pre-cementation functional occlusal tapping with composite resin onlays showing the minimum risk compared to ceramic ones.
KW - CAD/CAM
KW - Ceramic
KW - Composite resin
KW - Occlusal tapping
KW - Onlay
KW - Try-in
UR - http://www.scopus.com/inward/record.url?scp=80051471002&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=80051471002&partnerID=8YFLogxK
U2 - 10.1016/j.dental.2011.05.011
DO - 10.1016/j.dental.2011.05.011
M3 - Article
C2 - 21722950
AN - SCOPUS:80051471002
VL - 27
SP - 942
EP - 947
JO - Dental Materials
JF - Dental Materials
SN - 0109-5641
IS - 9
ER -