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Kimura S, Sekine H, Kawasaki T, Sato T, Kasahara N. Influence of remaining coronal tooth morphology with resin abutment and fiber post on static and dynamic fracture resistances. Dent Mater J 2024; 43:552-558. [PMID: 38987203 DOI: 10.4012/dmj.2023-295] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 07/12/2024]
Abstract
This study aimed to clarify the fracture resistance of resin abutments built on endodontically treated roots with the remaining coronal teeth via static and cyclic loading tests. Endodontically treated bovine roots, which had a remaining coronal tooth covered with an occupied area for a quarter and half of the circumference at the tensile side or covered the circumference at both the tensile and compressive sides, were fabricated to build up to the resin abutment. Fracture resistance was evaluated via static and cyclic loading tests by applying a load of 30° to the tooth axis. Half of the circumference of the remaining coronal tooth showed a significantly higher static fracture load and survival rate. The remaining coronal tooth on the compressive side improved the dynamic fracture resistance associated with severe fractures. The occupied area and location of the remaining coronal tooth affected the static and dynamic fracture resistances.
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Affiliation(s)
| | - Hideshi Sekine
- Department of Fixed Prosthodontics, Tokyo Dental College
| | | | - Toru Sato
- Department of Fixed Prosthodontics, Tokyo Dental College
| | - Norio Kasahara
- Department of Histology and Developmental Biology, Tokyo Dental College
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Alqarni H, Alfaifi MA, Altoman MS, AlHelal AA, Magdy Ahmed W, Ahmed Azhari A, Kattadiyil MT. A novel digital workflow for fabricating artificial periodontal ligament using three-dimensional printing flexible resin: A dental technique. Saudi Dent J 2024; 36:123-128. [PMID: 38375398 PMCID: PMC10874785 DOI: 10.1016/j.sdentj.2023.10.014] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/12/2023] [Revised: 10/17/2023] [Accepted: 10/24/2023] [Indexed: 02/21/2024] Open
Abstract
The fabrication of periodontal ligament (PDL) models for in vitro dental studies has seen a wide range of techniques and materials being utilized. This paper introduces a novel dental technique that employs a digital workflow for the fabrication of artificial PDL using three-dimensional printing of flexible resin. This innovative approach offers several advantages, including enhanced accuracy and realism in simulating PDL. The digital workflow facilitates a streamlined fabrication process, ensuring efficiency and precision. By presenting this novel technique, this digital approach contributes to the advancement of in vitro dental research, providing researchers with a reliable and realistic model for studying various dental phenomena.
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Affiliation(s)
- Hatem Alqarni
- Restorative and Prosthetic Dental Science Department, College of Dentistry, King Saud Bin Abdulaziz University for Health Sciences, Riyadh, Saudi Arabia
- King Abdullah International Medical Research Center, Ministry of National Guard Health Affairs, Riyadh, Saudi Arabia
| | - Mohammed A Alfaifi
- Department of Prosthetic Dental Sciences, King Khalid University College of Dentistry, Abha, Saudi Arabia
| | - Majed S Altoman
- Department of Prosthetic Dental Sciences, King Khalid University College of Dentistry, Abha, Saudi Arabia
| | - Abdulaziz A AlHelal
- Department of Prosthetic Dental Sciences, College of Dentistry, King Saud University, Riyadh, Saudi Arabia
| | - Walaa Magdy Ahmed
- Assistant Professor, Department of Restorative Dentistry, Faculty of Dentistry, King Abdulaziz, Jeddah, Saudi Arabia
| | - Amr Ahmed Azhari
- Assistant Professor, Department of Restorative Dentistry, Faculty of Dentistry, King Abdulaziz, Jeddah, Saudi Arabia
| | - Mathew T Kattadiyil
- Advanced Specialty Education Program in Prosthodontics, Loma Linda University School of Dentistry, Loma Linda, CA, United States
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Wang Y, Chen J, Qin S, Han X, Liao L, Sima X, Guo W. An in vivo evaluation of clear aligners for optimal orthodontic force and movement to determine high-efficacy and periodontal-friendly aligner staging. Heliyon 2023; 9:e15317. [PMID: 37113787 PMCID: PMC10126945 DOI: 10.1016/j.heliyon.2023.e15317] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/07/2022] [Revised: 03/15/2023] [Accepted: 04/03/2023] [Indexed: 04/29/2023] Open
Abstract
Objectives To investigate the effect of aligner displacement on tooth movement and periodontal health to improve the efficiency of aligner treatment and explore the mechanism in vivo. Methods A two-tooth site was established by a finite element (FE) model to virtually evaluate aligner staging. A randomized controlled experiment was conducted when the tooth sites in beagles were treated with fixed or aligner appliances with different movement and force, and tooth movement and internal structure were recorded during the alignment. After sacrificing five dogs, bone-periodontal ligament (PDL)-tooth specimens were removed and processed to conduct uniaxial compression and tensile tests as well as micro-CT imaging and histological analysis. Results Three displacements of 0.25, 0.35 and 0.45 mm were obtained from FE analysis and applied in beagles. In general, aligners had poorer performance on movement compared to fixed systems in vivo, but the aligner with a staging of 0.35 mm had the highest accuracy (67.46%) (P < 0.01). Loaded with severe force, fixed sites exhibited tissue damage due to excess force and rapid movement, while aligners showed better safety. The PDL under a 0.35-mm aligner treatment had the highest elastic modulus in the biomechanical test (551.4275 and 1298.305 kPa) (P < 0.05). Conclusions Compared to fixed appliances, aligners achieve slightly slower movement but better periodontal condition. Aligners with an interval of 0.35 mm have the highest accuracy and best PDL biomechanical and biological capacities, achieving the most effective and safest movement. Even with complexity of oral cavity and lack of evaluation of other factors, these results provide insight into faster displacement as a method to improve the efficacy of aligners.
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Affiliation(s)
- Yuru Wang
- State Key Laboratory of Oral Diseases & National Clinical Research Center for Oral Diseases, West China School/Hospital of Stomatology, Sichuan University, Chengdu, China
- Department of Pediatric Dentistry, West China Hospital of Stomatology, Sichuan University, Chengdu, China
| | - Jie Chen
- State Key Laboratory of Oral Diseases & National Clinical Research Center for Oral Diseases, West China School/Hospital of Stomatology, Sichuan University, Chengdu, China
- Department of Pediatric Dentistry, West China Hospital of Stomatology, Sichuan University, Chengdu, China
| | - Siwen Qin
- State Key Laboratory of Oral Diseases & National Clinical Research Center for Oral Diseases, West China School/Hospital of Stomatology, Sichuan University, Chengdu, China
- Department of Pediatric Dentistry, West China Hospital of Stomatology, Sichuan University, Chengdu, China
| | - Xue Han
- State Key Laboratory of Oral Diseases & National Clinical Research Center for Oral Diseases, West China School/Hospital of Stomatology, Sichuan University, Chengdu, China
- Department of Pediatric Dentistry, West China Hospital of Stomatology, Sichuan University, Chengdu, China
| | - Lijun Liao
- Sichuan Hospital of Stomatology, Chengdu, China
| | - Xiutian Sima
- Department of Neurosurgery, West China School of Medicine/West China Hospital, Sichuan University, Chengdu, China
- Corresponding author. Department of Neurosurgery, West China Hospital, Sichuan University, 37# Wainan Guoxue Road, Chengdu 610041, China.
| | - Weihua Guo
- State Key Laboratory of Oral Diseases & National Clinical Research Center for Oral Diseases, West China School/Hospital of Stomatology, Sichuan University, Chengdu, China
- Department of Pediatric Dentistry, West China Hospital of Stomatology, Sichuan University, Chengdu, China
- Corresponding author. Department of Pediatric Dentistry, West China Hospital of Stomatology, Sichuan University, No. 14, 3rd Sec., Ren Min Nan Road, Chengdu 610041, China.
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Kyogoku K, Someya T, Kasahara M, Hasegawa K, Takemoto S, Hattori M. Effect of bone defect width and a ferrule on the fracture characteristics of vertically fractured teeth reattached with adhesive resin cement: An in vitro study. Dent Mater J 2022; 41:552-559. [PMID: 35321975 DOI: 10.4012/dmj.2021-287] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
This study aimed to clarify the effects of vertical bone defect width and a ferrule on fracture of the fragments of fractured tooth reattached with adhesive resin cement (reattached tooth). The reattached tooth was built up by a fiber post and composite resin core for abutment and formed to the abutment with or without a ferrule. The vertical bone defect was fabricated with a V-shaped defect in different widths. The fracture load was evaluated using a universal testing machine. The vertical bone defect did not affect the fracture load, but a ferrule increased the root fracture load. For the specimens without a ferrule, debonding between the composite resin core and the root at the coronal loading side and fractures at the apical side of the root were found. In conclusion, the ferrule at abutment could affect fracture load and modes, and the bone defect width did not.
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Affiliation(s)
- Kei Kyogoku
- Department of Dental Material Science, Tokyo Dental College
| | - Tomoko Someya
- Department of Dental Material Science, Tokyo Dental College
| | | | - Koji Hasegawa
- Department of Dental Material Science, Tokyo Dental College
| | - Shinji Takemoto
- Department of Biomedical Engineering, Iwate Medical University
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deMoya AV, Schmidt ER, Eckert GJ, Katona TR. The effects of a PDL analogue on occlusal contact forces. J Oral Rehabil 2021; 49:316-326. [PMID: 34731498 DOI: 10.1111/joor.13278] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/27/2021] [Revised: 08/28/2021] [Accepted: 09/27/2021] [Indexed: 11/29/2022]
Abstract
BACKGROUND Previous bench-top studies examined the details of the mechanical environment of rigidly-fixed occluding teeth. It was demonstrated that during each chomp, contacting molar teeth experience in-occlusal-plane forces (Flateral ) that are highly transient in magnitude and direction. OBJECTIVES The objectives of this study are to identify Flateral behaviors that are attributable to the presence of a visco-elastic periodontal ligament (PDL) analogue, and to asses the necessity of incorporating it into future studies. METHODS A weighted maxillary molar denture tooth was lowered onto, and raised from, a matching mandibular molar 10 times. The latter was supported by a load cell that continuously measured Flateral . For statistical purposes, the test was repeated with 21 (n = 21) different occlusal relationships obtained with 0.05 mm incremental shifts of the lower assembly. RESULTS Overall, the results are similar to those of rigid attachment but the details of the Flateral profiles are very different. CONCLUSION The PDL plays a major role in the mechanical environment of occlusion, suggesting that, in general (not necessarily always), it should be integrated into studies of occlusion.
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Affiliation(s)
| | | | - George J Eckert
- Department of Biostatistics, Indiana University School of Medicine, Indianapolis, USA
| | - Thomas R Katona
- Department of Orthodontics and Oral Facial Genetics, Indiana University School of Dentistry, 1121 W. Michigan St, Indianapolis, IN, 46202, USA
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