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Koru Akan BE, Hancıoğlu Kircelli B, Paşaoğlu Bozkurt A, Gögen H. Evaluation of the effects of semipontic design on tooth movements during mesialization of mandibular second molar performed with clear aligner treatment by finite element analysis. Am J Orthod Dentofacial Orthop 2024:S0889-5406(24)00277-4. [PMID: 39140924 DOI: 10.1016/j.ajodo.2024.07.007] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/01/2024] [Revised: 07/11/2024] [Accepted: 07/01/2024] [Indexed: 08/15/2024]
Abstract
INTRODUCTION Loss of the mandibular first molar is common in orthodontic patients. One treatment option is the mesialization of the second and third molars. This study aimed to investigate the displacement and type of movement in the second molar during mandibular second molar mesialization with clear aligner treatment using finite element analysis in configurations with or without pontic, semipontic, and anatomic pontic for the edentulous space. METHODS Mesialization of the mandibular second molar with clear aligner treatment was simulated using the AlGOR Fempro program (ALGOR, Inc, Pa) with 3 different configurations. RESULTS In the transverse direction, the highest rotation occurred in the anatomic pontic model, whereas the lowest rotation was in the semipontic model. In the sagittal axis, although tooth movement was realized by tipping in all scenarios, the semipontic model showed the closest movement to translation because of a higher rate of crown-root movement. In the vertical axis, although extrusion occurred in all configurations, the semipontic model showed the least extrusion forces, whereas the anatomic pontic model showed the most. CONCLUSIONS Mesiobuccal rotation, mesial tipping, and extrusion were observed in all models. However, the semipontic design had the closest movement to translational. Further randomized, controlled clinical trials are needed to evaluate the effects of different pontic designs on tooth movements.
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Affiliation(s)
- Burcu Ece Koru Akan
- Department of Orthodontics, Faculty of Dentistry, Istanbul Aydin University, Istanbul, Turkey.
| | | | - Aylin Paşaoğlu Bozkurt
- Department of Orthodontics, Faculty of Dentistry, Istanbul Aydin University, Istanbul, Turkey
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Alyami B. Sequelae of Unreplaced Tooth Loss in Orthodontic Patients: A Cross-Sectional Study in Najran, Kingdom of Saudi Arabia. Contemp Clin Dent 2023; 14:123-127. [PMID: 37547435 PMCID: PMC10399801 DOI: 10.4103/ccd.ccd_155_21] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/23/2021] [Revised: 07/13/2021] [Accepted: 10/06/2022] [Indexed: 11/26/2022] Open
Abstract
Background The early tooth loss has an adverse effect on the overall well-being of an individual. The aim of the current study was to highlight the orthodontic complications of long-term tooth loss in the city of Najran. Materials and Methods This was a cohort study of patients presenting for orthodontic rehabilitation. A total of 326 patients that presented for orthodontic rehabilitation were examined clinically and data such as age, gender, number of missing teeth, missing teeth, duration of missing teeth, tipping, and overerupted and rotated teeth were recorded. Patients that can be treated with orthodontic space closure were excluded from the study. Patients' data were analyzed using IBM SPSS Statistics and results were presented as simple frequencies and descriptive statistics. Results Out of 326 patients that presented for orthodontic rehabilitation, 259 patients had missing teeth with its sequelae that will demand prosthodontic rehabilitation with a prevalence rate of 79.4%. There are 97 (37.5%) males and 162 (62.5%) females with M:F ratio of 1:1.7. The age ranged from 15 to 52 years with mean ± standard deviation (28.5 ± 8.5). The age group 21-30 years constitutes the group with the highest number of missing teeth. A total number of 595 (60.2%) teeth were missing, 173 (17.5%) teeth were tipped, and 124 (12.5%) teeth were overerupted, whereas only 97 (9.8%) teeth were rotated (n = 989). Fixed orthodontic appliances (FOAs) were used for all cases with rotation and FOAs + Mini Screws were used for all cases with tipping, overeruption, and/or combinations. The dental loss was managed by prosthesis depending on patients' choice and financial capability ranging from removable/fixed prosthesis and dental implants. Conclusion Orthodontic consequences of early tooth loss include tipping and rotation of adjacent teeth and overeruption of opposing teeth. Early acknowledgment of tooth replacement after tooth loss is essential in preventing long-term orthodontic adverse effects.
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Affiliation(s)
- Bandar Alyami
- Department of Preventive Dentistry, Faculty of Dentistry, Najran University, Najran, Saudi Arabia
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Saga AY, Parra AXG, Silva IC, Dória C, Camargo ES. Orthodontic treatment with passive eruption and mesialization of semi-impacted mandibular third molar in an adult with multiple dental losses. Dental Press J Orthod 2019; 24:36-47. [PMID: 31994645 PMCID: PMC6986187 DOI: 10.1590/2177-6709.24.6.036-047.oar] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/25/2018] [Accepted: 08/15/2019] [Indexed: 12/03/2022] Open
Abstract
Objective: This article describes the orthodontic treatment performed on an adult patient with multiple dental losses. Case report: A female patient, 20 years and 4 months old, presented with the following conditions: absence of teeth #26, #35, #36 and #46; semi-impacted tooth #48; inclined molars adjacent to an edentulous space; canines and premolars in a Class II relationship; a convex profile; biprotrusion; and forced lip sealing. Results: Space in the region of tooth #26 was closed, as well the space of tooth #46; tooth #48 erupted and followed mesial movement passively; space of the region of tooth #35 was maintained for the placement of a dental implant; uprighting of tooth #37 was obtained. Aesthetic and functional goals of the treatment were achieved. Results remained stable 10 years after the end of the treatment. Conclusion: The modified helical loop could be effectively used in orthodontic mechanics to close edentulous spaces. Passive semi-impacted mandibular third molar eruption and mesialization can occur in adults when proper space is provided.
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Affiliation(s)
- Armando Yukio Saga
- Pontifícia Universidade Católica do Paraná, Escola de Ciências da Vida (Curitiba/PR, Brazil)
| | - Ariane Ximenes Graciano Parra
- Pontifícia Universidade Católica do Paraná, Escola de Ciências da Vida, Programa de Pós-Graduação em Odontologia (Curitiba/PR, Brazil)
| | - Isteicy Cortêz Silva
- Pontifícia Universidade Católica do Paraná, Escola de Ciências da Vida, Graduação em Odontologia (Curitiba/PR, Brazil)
| | - Cayana Dória
- Pontifícia Universidade Católica do Paraná, Escola de Ciências da Vida, Programa de Pós-Graduação em Odontologia (Curitiba/PR, Brazil)
| | - Elisa Souza Camargo
- Pontifícia Universidade Católica do Paraná, Escola de Ciências da Vida, Programa de Pós-Graduação em Odontologia (Curitiba/PR, Brazil)
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Ryu WK, Park JH, Tai K, Kojima Y, Lee Y, Chae JM. Prediction of optimal bending angles of a running loop to achieve bodily protraction of a molar using the finite element method. Korean J Orthod 2018; 48:3-10. [PMID: 29291183 PMCID: PMC5702775 DOI: 10.4041/kjod.2018.48.1.3] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/03/2017] [Revised: 05/23/2017] [Accepted: 06/01/2017] [Indexed: 11/10/2022] Open
Abstract
Objective The purpose of this study was to predict the optimal bending angles of a running loop for bodily protraction of the mandibular first molars and to clarify the mechanics of molar tipping and rotation. Methods A three-dimensional finite element model was developed for predicting tooth movement, and a mechanical model based on the beam theory was constructed for clarifying force systems. Results When a running loop without bends was used, the molar tipped mesially by 9.6° and rotated counterclockwise by 5.4°. These angles were almost similar to those predicted by the beam theory. When the amount of tip-back and toe-in angles were 11.5° and 9.9°, respectively, bodily movement of the molar was achieved. When the bend angles were increased to 14.2° and 18.7°, the molar tipped distally by 4.9° and rotated clockwise by 1.5°. Conclusions Bodily movement of a mandibular first molar was achieved during protraction by controlling the tip-back and toe-in angles with the use of a running loop. The beam theory was effective for understanding the mechanics of molar tipping and rotation, as well as for predicting the optimal bending angles.
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Affiliation(s)
| | - Jae Hyun Park
- Postgraduate Orthodontic Program, Arizona School of Dentistry & Oral Health, A. T. Still University, Mesa, AZ, USA.,Graduate School of Dentistry, Kyung Hee University, Seoul, Korea
| | - Kiyoshi Tai
- Postgraduate Orthodontic Program, Arizona School of Dentistry & Oral Health, A. T. Still University, Mesa, AZ, USA.,Private Practice, Okayama, Japan
| | - Yukio Kojima
- Department of Mechanical Engineering, Nagoya Institute of Technology, Nagoya, Japan
| | - Youngjoo Lee
- Department of Orthodontics, Wonkwang University School of Dentistry, Iksan, Korea
| | - Jong-Moon Chae
- Postgraduate Orthodontic Program, Arizona School of Dentistry & Oral Health, A. T. Still University, Mesa, AZ, USA.,Department of Orthodontics, Wonkwang University School of Dentistry, Iksan, Korea.,Wonkwang Dental Research Institute, Wonkwang University School of Dentistry, Iksan, Korea.,The Korean Orthodontic Research Institute Inc., Seoul, Korea
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Kim MJ, Park JH, Kojima Y, Tai K, Chae JM. A finite element analysis of the optimal bending angles in a running loop for mesial translation of a mandibular molar using indirect skeletal anchorage. Orthod Craniofac Res 2017; 21:63-70. [PMID: 29271058 DOI: 10.1111/ocr.12216] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 11/29/2017] [Indexed: 11/30/2022]
Abstract
OBJECTIVES To estimate the optimal bending angles in the running loop for mesial translation of a mandibular second molar using indirect skeletal anchorage and to clarify the mechanics of tipping and rotating the molar. METHODS A three-dimensional finite element model was developed for predicting tooth movement, and a mechanical model based on the beam theory was constructed for clarifying the force systems. RESULTS When using a running loop without bends, the molar tipped mesially 14.4° and lingually 0.6°, rotated counterclockwise 4.1°, and the incisors retracted 0.02 mm and intruded 0.05 mm. These angles were about the same as those estimated by the beam theory. When the amount of tip back and toe-in angles was 11.0°, mesial translation of the molar was achieved, and incisors retracted 0.10 mm and intruded 0.30 mm. CONCLUSIONS Mesial translation of a mandibular second molar without any significant movement of anterior teeth was achieved during protraction by controlling the tip back and toe-in angles and enhancing anterior anchorage with the combined use of a running loop and indirect skeletal anchorage.
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Affiliation(s)
- M-J Kim
- Department of Orthodontics, School of Dentistry, University of Wonkwang, Iksan, Korea
| | - J H Park
- Postgraduate Orthodontic Program, Arizona School of Dentistry & Oral Health, A. T. Still University, Mesa, Arizona, Maricopa.,Graduate School of Dentistry, Kyung Hee University, Seoul, Korea
| | - Y Kojima
- Department of Mechanical Engineering, Nagoya Institute of Technology, Nagoya, Japan
| | - K Tai
- Postgraduate Orthodontic Program, Arizona School of Dentistry & Oral Health, A. T. Still University, Mesa, Arizona, Maricopa.,Private practice in orthodontics, Okayama, Japan
| | - J-M Chae
- Postgraduate Orthodontic Program, Arizona School of Dentistry & Oral Health, A. T. Still University, Mesa, Arizona, Maricopa.,Department of Orthodontics, School of Dentistry, Wonkwang Dental Research Institute, University of Wonkwang, Iksan, Korea.,The Korean Orthodontic Research Institute Inc., Seoul, Korea
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Raveli TB, Raveli DB, de Mathias Almeida KC, Pinto ADS. Molar Uprighting: A Considerable and Safe Decision to Avoid Prosthetic Treatment. Open Dent J 2017; 11:466-475. [PMID: 29114332 PMCID: PMC5646130 DOI: 10.2174/1874210601711010466] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/25/2017] [Revised: 04/26/2017] [Accepted: 07/13/2017] [Indexed: 11/29/2022] Open
Abstract
Background: Tipped lower molar over edentulous space is very common in orthodontics practice when adults seek treatment. The segmented arch technique features a predictable force system that provides a controlled release of force that can produce light and continuous tooth movement. Case Description: A female adult patient, who lost a permanent lower first molar, needed correction of the position of her permanent first molar place. Instead of making space for rehabilitation, it was closed after second molar uprighting and a balanced interdigitation was created without prosthetics. The patient was successfully treated with segmented arch technique using root correction spring activated with geometry VI to promote uprighting of a tipped molar and Niti spring coil to promote space closure. Practical Implications: Segmented arch technique is known to provide predictable light and continuous forces, which is very much indicated in adult treatment. There are several things to consider when orthodontically treating adult patients. Their periodontal conditions might not be ideal, less bone apposition may occur, and side effects of orthodontic tooth movement are expected. Thus, a predictable and controlled orthodontic treatment is needed.
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Affiliation(s)
- Taísa Boamorte Raveli
- Orthodontics Department, Faculty of Dentistry, São Paulo State University, Avenida Portugal, 887 - CEP 14.801-075 Araraquara-SP Brazil
| | - Dirceu Barnabé Raveli
- Orthodontics Department, Faculty of Dentistry, São Paulo State University, Avenida Portugal, 887 - CEP 14.801-075 Araraquara-SP Brazil
| | | | - Ary Dos Santos Pinto
- Orthodontics Department, Faculty of Dentistry, São Paulo State University, Rua Humaitá, 1680 - CEP 14.801-903 Araraquara-SP Brazil
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Chae JM. Treatment of Class II malocclusion with bialveolar protrusion by means of unusual extractions and anchorage mini-implant. Dental Press J Orthod 2012. [DOI: 10.1590/s2176-94512012000500023] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
INTRODUCTION: Patients with dental Class II bialveolar protrusion are generally treated by extracting the four first premolars or two first and two second premolars, and retracting the anterior teeth. This case report describes the treatment of an adult patient with bialveolar protrusion, a Class II canine and molar relationship, and lip protrusion. METHODS: In this patient, the maxillary right second molar (1.7) had to be extracted due to extensive caries. To create sufficient space to retract the anterior teeth, the maxillary right posterior teeth were distalized with a maxillary posterior mini-implant (1.2~1.3 mm in diameter, 10 mm long), which was placed into the maxillary tuberosity area and allowed an en masse retraction of the maxillary anterior teeth. RESULTS: Overall, mini-implant can provide anchorage to produce a good facial profile even without additional premolar extraction in cases of dental Class II bialveolar protrusion with the hopeless second molar. CONCLUSION: The total treatment period was 42 months and the results were acceptable for 34 months after debonding.
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Saga AY, Maruo IT, Maruo H, Guariza Filho O, Camargo ES, Tanaka OM. Treatment of an adult with several missing teeth and atrophic old mandibular first molar extraction sites. Am J Orthod Dentofacial Orthop 2011; 140:869-78. [DOI: 10.1016/j.ajodo.2010.06.027] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/01/2009] [Revised: 06/01/2010] [Accepted: 06/01/2010] [Indexed: 10/14/2022]
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