The Influence of Axial Grooves on Dislodgment Resistance of Prosthetic Metal Crowns in Canine Teeth of Dogs.
The reported failure rate for full veneer crowns of canine teeth of dogs is suboptimal, particularly in teeth with naturally poor retentive features, such as those with low height/diameter (H/D) ratios or high convergence angles (CAs). The objective of the present study was to evaluate the application of axial grooves in an effort to develop a crown preparation design that enhances the retention of full veneer crowns in dogs. Crown dislodgment testing was performed on cast alloy dies of canine teeth with unfavorable retention features (low H/D and high CA) prepared with (n = 14) and without axial grooves (n = 15) to evaluate the force required to dislodge a cemented full veneer crown. The crown/die units were secured within a universal testing machine and a load was applied at the 45° oblique direction from distal to mesial to replicate the vector encountered during biting-pulling action. The maximum force required to cause crown dislodgment was recorded for each crown. Statistical analysis revealed a significant increase in force required for crown dislodgment when axial grooves were included in the crown preparation design ( P < .001). Crown retention is improved in canine teeth with otherwise poor retention features when axial grooves are made in the labial and palatal/lingual walls during crown preparation.
1 Department of Surgical Sciences, School of Veterinary Medicine, University of Wisconsin-Madison, Madison, WI, USA.
Stephanie
S
Goldschmidt
2 Bone and Joint Biomechanics Lab, Department of Mechanical Engineering, College of Engineering, University of Wisconsin-Madison, Madison, WI, USA.
Caitlyn J
CJ
Collins
3 Department of Biostatistics and Medical Informatics, School of Medicine and Public Health, University of Wisconsin-Madison, Madison, WI, USA.
Scott
S
Hetzel
2 Bone and Joint Biomechanics Lab, Department of Mechanical Engineering, College of Engineering, University of Wisconsin-Madison, Madison, WI, USA.
Heidi-Lynn
HL
Ploeg
1 Department of Surgical Sciences, School of Veterinary Medicine, University of Wisconsin-Madison, Madison, WI, USA.
Jason W
JW
Soukup
D000818:Animals; D002484:Cementation; D003442:Crowns; D003481:Cuspid; D017268:Dental Prosthesis Retention / Q000662:veterinary*; D003813:Dentistry / Q000379:methods / Q000662:veterinary*; D004285:Dogs / Q000601:surgery*; D008670:Metals; D014070:Tooth / Q000601:surgery*
D008670:Metals
axial grooves; canine teeth; crowns; dogs; retention