» Articles » PMID: 39007125

The Effect of Student Experience and Tooth Location on Finish Line Width and Angle of Full Metal Crown Preparations in Preclinical Setting

Overview
Publisher Dove Medical Press
Specialty Medical Education
Date 2024 Jul 15
PMID 39007125
Authors
Affiliations
Soon will be listed here.
Abstract

Purpose: To determine the effect of experience and tooth location on the finish line width and angle of crown preparations performed by undergraduate students.

Methods: Eighty full metal crown preparations on typodont teeth were divided into four groups: Group 1: 20 preparations performed on mandibular first molar in the first semester. Group 2: 20 preparations performed on mandibular first molar in the second semester. Group 3: 20 preparations performed on mandibular second molar in the first semester. Group 4: 20 preparations performed on mandibular second molar in the second semester. All prepared teeth were scanned, and the finish line width and angles were measured at 8 different locations. Paired -test in the SPSS software was used to compare and determine the effect of experience and tooth location on the students' performance.

Results: There was a statistically significant difference in the mandibular first molar finish line width between the first and second semesters for the same student in the distal, distolingual, and mesiobuccal areas of the tooth. There was a statistically significant increase in finish line width between first and second molars in the distobuccal, distal, distolingual, lingual, and mesial side of the tooth. Regarding the finish line angle, there was a statistically significant difference between the first and second semesters on the distal side of the tooth. There was a statistically significant increase in finish line angle between first and second molars in the distobuccal side of the tooth.

Conclusion: As students gain more experience in different types of tooth preparations, they tend to produce a wider finish line than that recommended for full metal crown preparation. The tooth location in the mouth influences the width and angle of the finish line hence the more inaccessible areas on the tooth have a wider finish line.

References
1.
Strain K, Tiu J, Mackie J, Bonsor S, Ibbetson R . Adequately Prepared? A Study Using an Innovative Computer Application to Measure Clinical Crown Convergence Angles Achieved by Students at a UK Dental School. Eur J Prosthodont Restor Dent. 2019; 27(1):32-38. DOI: 10.1922/EJPRD_01832Strain07. View

2.
Marghalani T . Convergence angles of metal ceramic crowns prepared by dental students. J Prosthet Dent. 2014; 112(5):1250-6. DOI: 10.1016/j.prosdent.2014.03.024. View

3.
Bottino M, Valandro L, Buso L, Ozcan M . The influence of cervical finish line, internal relief, and cement type on the cervical adaptation of metal crowns. Quintessence Int. 2007; 38(7):e425-32. View

4.
Esser C, Kerschbaum T, Winkelmann V, Krage T, Faber F . A comparison of the visual and technical assessment of preparations made by dental students. Eur J Dent Educ. 2006; 10(3):157-61. DOI: 10.1111/j.1600-0579.2006.00408.x. View

5.
Marghalani T . Frequency of undercuts and favorable path of insertion in abutments prepared for fixed dental prostheses by preclinical dental students. J Prosthet Dent. 2016; 116(4):564-569. DOI: 10.1016/j.prosdent.2016.03.014. View