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Li J, Fang X, Huang J, Zhang J, Wu J, Li G, Qian J, Yang H. Effect of a digital assessment system for the preclinical tooth preparation of metal-ceramic crowns: A pilot study. J Prosthet Dent 2023:S0022-3913(23)00691-1. [PMID: 37940472 DOI: 10.1016/j.prosdent.2023.10.010] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/19/2023] [Revised: 10/08/2023] [Accepted: 10/10/2023] [Indexed: 11/10/2023]
Abstract
STATEMENT OF PROBLEM Tooth preparation is a fundamental aspect of prosthodontics and serves as a focal point in preclinical courses. Conventional pedagogy relies heavily on the expertise of instructors, whereas digital technology has the potential to offer instantaneous feedback. The efficacy of a digital assessment system in comparison with traditional teaching methods remains uncertain. PURPOSE The purpose of this study was to compare the training effects of traditional assessment and digital evaluation on tooth preparations for the metal-ceramic crowns performed by preclinical students on the convergence angle and tooth reduction. MATERIAL AND METHODS A total of 40 predoctoral students were randomly divided into the digital group and the traditional group to complete tooth preparation for a metal-ceramic crown on a left mandibular first molar. Students in the traditional group were taught by an experienced instructor, while the digital group students were trained by an objective digital assessment system without instructor guidance. Each student completed the tooth preparation in 20 min, received feedback according to the respective training methods, and later prepared another tooth. In this way, all students completed 4 tooth preparations in 2 weeks. All preparations were evaluated by an optical scanner. Parameters for comparing the digital group with the traditional group were the convergence angle and reduction at different stages. Questionnaires on the digital training system were answered by the students of the digital group. The t tests or Wilcoxon signed rank tests and chi-squared tests were used to analyze the differences between the 2 groups (α=.01). RESULTS A decreasing trend in convergence angle was seen in both groups, but the 2 groups were statistically similar (P>.01). After training, a decreasing trend was seen in under-reduction and overreduction on 5 surfaces in the digital group. Conversely, in the traditional group, a noteworthy increase was seen in under-reduction on the distal surface (P=.002). Nevertheless, no significant difference was found between the 2 groups (P>.01). According to the results of the questionnaire, over 80% of the students had a positive attitude toward the digital assessment system, and more than 80% of the students expressed their interest in the digital assessment system for tooth preparation training. CONCLUSIONS Traditional teaching and digital feedback provided similar training effects to improve the quality of tooth preparations for preclinical dental students.
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Affiliation(s)
- Junman Li
- Instructor, Yunnan Key Laboratory of Stomatology, The Second Clinical Division, Affiliated Stomatological Hospital, Kunming Medical University, Kunming, PR China
| | - Xin Fang
- Instructor, Yunnan Key Laboratory of Stomatology, Affiliated Stomatological Hospital, Kunming Medical University, Kunming, PR China
| | - Jinhui Huang
- Instructor, Yunnan Key Laboratory of Stomatology, Affiliated Stomatological Hospital, Kunming Medical University, Kunming, PR China
| | - Jun Zhang
- Instructor, Yunnan Key Laboratory of Stomatology, Affiliated Stomatological Hospital, Kunming Medical University, Kunming, PR China
| | - Jinyan Wu
- Instructor, Yunnan Key Laboratory of Stomatology, Department of Endodontics, Affiliated Stomatological Hospital, Kunming Medical University, Kunming, PR China
| | - Guiding Li
- Instructor, Yunnan Key Laboratory of Stomatology, Affiliated Stomatological Hospital, Kunming Medical University, Kunming, PR China
| | - Jie Qian
- Associate Professor, Department of Prosthodontics, Affiliated Stomatological Hospital, Kunming Medical University, Kunming, PR China
| | - Hefeng Yang
- Associate Professor, Yunnan Key Laboratory of Stomatology, Department of Prosthodontics, Affiliated Stomatological Hospital, Kunming Medical University, Kunming, PR China..
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Kim YK, Kim JH, Jeong Y, Yun MJ, Lee H. Comparison of digital and conventional assessment methods for a single tooth preparation and educational satisfaction. EUROPEAN JOURNAL OF DENTAL EDUCATION : OFFICIAL JOURNAL OF THE ASSOCIATION FOR DENTAL EDUCATION IN EUROPE 2023; 27:262-270. [PMID: 35384190 DOI: 10.1111/eje.12799] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/29/2021] [Revised: 02/14/2022] [Accepted: 03/08/2022] [Indexed: 06/14/2023]
Abstract
INTRODUCTION Digital feedback for tooth preparation can provide dental practitioners with more objective and accurate evaluations compared to conventional methods. This study aimed to evaluate the educational effect and satisfaction of digital feedback compared with those of the conventional putty index method for tooth preparation. MATERIAL AND METHODS Forty-eight third-grade dental students were selected. All students performed a full-coverage preparation on a right mandibular first molar resin tooth. They were randomly divided into four groups (n = 12)-no guide (control), putty index, digital feedback, and digital and putty index assessment. Three-dimensional analysis was performed using an analysis software (GomInspect 2018, Gom) to evaluate the amount of tooth structure removed. At the end of the practice, the students completed a questionnaire to evaluate the educational satisfaction of the respective methods. RESULTS There was no statistical significance of the amount of preparation amongst groups in most of the measured areas only except for several specific points. Overall occlusal surface showed 0.99 ± 0.27 mm in the N group (no guide) and 1.15 ± 0.31 mm in the D group (digital feedback), and overall axial surface showed no statistical differences (p > .05). The groups that used digital assessment showed a high level of satisfaction compared with conventional assessment. CONCLUSIONS It was difficult to confirm that the digital-based feedback promotes accurate tooth preparation compared to conventional feedback within the limitation of this study. However, it improved educational satisfaction and permitted objective evaluation.
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Affiliation(s)
- Yeong-Kyu Kim
- Department of Prosthodontics, School of Dentistry, Pusan National University, Yangsan, South Korea
| | - Jae-Hoon Kim
- Department of Dental Education, Dental and Life Science Institute, School of Dentistry, Pusan National University, Dental Research Institute, Yangsan, South Korea
| | - Yuwon Jeong
- Oral Research Science Center, Department of Prosthodontics, Yonsei University College of Dentistry, Seoul, South Korea
| | - Mi-Jung Yun
- Department of Prosthodontics, Dental and Life Science Institute, School of Dentistry, Pusan National University, Dental Research Institute, Yangsan, South Korea
| | - Hyeonjong Lee
- Department of Prosthodontics, Yonsei University College of Dentistry, Seoul, South Korea
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Chung SY, Lee H, Chae YK, Jung YS, Jo SS, Lee KE, Choi SC, Nam OH. Stress distribution in pediatric zirconia crowns depending on different tooth preparation and cement type: a finite element analysis. BMC Oral Health 2022; 22:550. [PMID: 36456927 PMCID: PMC9714224 DOI: 10.1186/s12903-022-02596-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/10/2022] [Accepted: 11/15/2022] [Indexed: 12/05/2022] Open
Abstract
BACKGROUND In clinical settings, tooth preparation for prefabricated zirconia crowns (PZCs) in the primary dentition varies widely. However, knowledge about the biomechanical behavior of PZCs in various clinical settings is limited. This study was conducted to evaluate the biomechanical behavior of PZCs in different clinical settings using 3-dimensional finite element analysis. METHODS 3-dimensional models of the PZC, cement, and tooth with six different conditions were simulated in primary molar teeth, incorporating cement thickness (100, 500, and 1000 μm) and cement type (resin-modified glass ionomer cement and resin cement). A total of 200 N of occlusal force was applied to the models, both vertically and obliquely as representative cases. A general linear model univariate analysis with partial eta-squared (ηp2) was performed to evaluate the relative effects of the variables. RESULTS The overall stress of tooth was increased as the cement space increases under oblique loading. The von Mises stress values of the resin cements were significantly higher than those of the resin-modified glass ionomer cements for all cement thicknesses (p < .05). The effect size of the cement type (ηp2 = .519) was more dominant than the cement thickness (ηp2 = .132) in the cement layer. CONCLUSIONS Within the limits of this study, cement type has a greater influence on the biomechanical behavior of PZCs than cement thickness.
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Affiliation(s)
- Sang-Yeop Chung
- grid.263333.40000 0001 0727 6358Department of Civil and Environmental Engineering, Sejong University, Seoul, Korea
| | - Hyeonjong Lee
- grid.15444.300000 0004 0470 5454Department of Prosthodontics, Dental College, Yonsei University, Seoul, Korea
| | - Yong Kwon Chae
- grid.289247.20000 0001 2171 7818Department of Pediatric Dentistry, School of Dentistry, Kyung Hee University, Kyungheedae-Ro 26, Dongdaemoon-Gu, Seoul, 02447 Korea ,grid.411231.40000 0001 0357 1464Present Address: Department of Pediatric Dentistry, Kyung Hee University College of Dentistry, Kyung Hee Universtiy Medical Center, Seoul, Korea
| | - Yun Sun Jung
- grid.289247.20000 0001 2171 7818Department of Pediatric Dentistry, School of Dentistry, Kyung Hee University, Kyungheedae-Ro 26, Dongdaemoon-Gu, Seoul, 02447 Korea ,grid.411231.40000 0001 0357 1464Present Address: Department of Pediatric Dentistry, Kyung Hee University College of Dentistry, Kyung Hee Universtiy Medical Center, Seoul, Korea
| | - Su-Sung Jo
- grid.263333.40000 0001 0727 6358Department of Civil and Environmental Engineering, Sejong University, Seoul, Korea
| | - Ko Eun Lee
- grid.289247.20000 0001 2171 7818Department of Pediatric Dentistry, School of Dentistry, Kyung Hee University, Kyungheedae-Ro 26, Dongdaemoon-Gu, Seoul, 02447 Korea ,grid.411231.40000 0001 0357 1464Present Address: Department of Pediatric Dentistry, Kyung Hee University College of Dentistry, Kyung Hee Universtiy Medical Center, Seoul, Korea
| | - Sung Chul Choi
- grid.289247.20000 0001 2171 7818Department of Pediatric Dentistry, School of Dentistry, Kyung Hee University, Kyungheedae-Ro 26, Dongdaemoon-Gu, Seoul, 02447 Korea ,grid.411231.40000 0001 0357 1464Present Address: Department of Pediatric Dentistry, Kyung Hee University College of Dentistry, Kyung Hee Universtiy Medical Center, Seoul, Korea
| | - Ok Hyung Nam
- grid.289247.20000 0001 2171 7818Department of Pediatric Dentistry, School of Dentistry, Kyung Hee University, Kyungheedae-Ro 26, Dongdaemoon-Gu, Seoul, 02447 Korea ,grid.411231.40000 0001 0357 1464Present Address: Department of Pediatric Dentistry, Kyung Hee University College of Dentistry, Kyung Hee Universtiy Medical Center, Seoul, Korea
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