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Atif M, Sharma S, Tewari N, Rahul M, Mathur VP, Bansal K. Effect of wire diameter and extent of wire composite splint on the mobility of luxated and anchor primary teeth: A typodont study. Dent Traumatol 2024; 40:470-476. [PMID: 38270265 DOI: 10.1111/edt.12936] [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] [Received: 09/12/2023] [Revised: 12/29/2023] [Accepted: 01/10/2024] [Indexed: 01/26/2024]
Abstract
BACKGROUND/AIMS The recommendations for splinting are well established for the injuries of permanent dentition; however, ambiguity still exists for the injuries in primary dentition. Hence, this study aimed to determine the most appropriate dimensions of stainless steel wire and its extent, for achieving the physiologic mobility in primary dentition. MATERIAL AND METHODS This study was designed as an in vitro experiment by using a typodont model of primary dentition. The baseline mobility of primary maxillary incisors was calibrated to the physiologic mobility of natural primary incisors by using a Teflon tape wrapped around the roots of resin teeth. Splinting was done using a stainless steel wire of 0.2 mm (Group I), 0.3 mm (Group II), and 0.4 mm (Group III). These groups were subdivided (a, b, and c) on the basis of the extent of the splint, and pre splint mobility (Pre-PV) and post-splint mobility (Post-PV) were tested by Periotest M. The splint effect was calculated by subtracting Post-PVs and Pre-PVs. RESULTS The normal values of mobility in healthy human volunteers ranged from 10.5 to 13. The overall splint effect was higher in Group III irrespective of the extent of the splint, whereas it was found to be the lowest in Group I (b and c). The splint effect increased with the extent of the splint in all the groups. Among all the groups, the splint effect on the anchor teeth was observed to increase with the extent of the splint and the diameter of the wire. CONCLUSION The mobility of the injured and anchor teeth splinted with 0.2-mm stainless steel wire was similar to the pre-splint and physiologic mobility. The most favorable extension was one tooth adjacent to the injured tooth on each side for both 0.2- and 0.3-mm wires.
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Affiliation(s)
- Mohammad Atif
- Division of Pediatric and Preventive Dentistry, Centre for Dental Education and Research, All India Institute of Medical Sciences, New Delhi, India
| | - Saurabh Sharma
- Division of Pediatric and Preventive Dentistry, Centre for Dental Education and Research, All India Institute of Medical Sciences, New Delhi, India
| | - Nitesh Tewari
- Division of Pediatric and Preventive Dentistry, Centre for Dental Education and Research, All India Institute of Medical Sciences, New Delhi, India
| | - Morankar Rahul
- Division of Pediatric and Preventive Dentistry, Centre for Dental Education and Research, All India Institute of Medical Sciences, New Delhi, India
| | - Vijay Prakash Mathur
- Division of Pediatric and Preventive Dentistry, Centre for Dental Education and Research, All India Institute of Medical Sciences, New Delhi, India
| | - Kalpana Bansal
- Division of Pediatric and Preventive Dentistry, Centre for Dental Education and Research, All India Institute of Medical Sciences, New Delhi, India
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Peruga M, Lis J. Correlation of sex hormone levels with orthodontic tooth movement in the maxilla: a prospective cohort study. Eur J Orthod 2024; 46:cjae025. [PMID: 38764143 DOI: 10.1093/ejo/cjae025] [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: 05/21/2024]
Abstract
BACKGROUND Sex hormones secreted during the menstrual cycle and the application of orthodontic forces to teeth can affect the metabolism of periodontal ligaments. This study aimed to determine whether there are any differences in orthodontic tooth displacement during the menstrual cycle and when using hormonal contraceptives and whether the amount of female sex hormones influences the efficiency of tooth displacement. METHODS A total of 120 women aged between 20 and 30 years with Angle Class II requiring transpalatal arch (TPA) to derotate teeth 16 and 26 were included in this study. The participants were divided into two groups: group A, which included women with regular menstruation, and control group B, which included women taking monophasic combined oral contraceptives. Group A was divided into subgroups according to the moment of TPA activation: menstruation (A1), ovulation phase (A2), and luteal phase (A3) (examination I). On intraoral scans, measurement points were marked on the proximal mesial cusps of teeth 16 and 26, and the intermolar distance (M1) was determined. The change in the position of the measurement points 6 weeks after activation (examination II) made it possible to determine the derotating extent of teeth 16 (O16) and 26 (O26) and the widening of the intermolar distance (M2-M1). In examinations I and II, tooth mobility in the alveoli was assessed using Periotest based on the periotest values (PTV) PTV1 and PTV2, respectively. RESULTS A significant difference in all parameters was observed among groups A1, A2, and A3 (P < 0.001). Group A3 showed the highest values of parameters O16, O26, and M2-M1, and group A2 showed the lowest values, which did not differ from the control group (P = 0.64). PTV2 and PTV1 were the highest in group A3 and the lowest in groups A1 and B. Intergroup differences were statistically significant (P < 0.001). CONCLUSIONS With the quantification of changes in tooth mobility in the alveoli during the menstrual cycle in women undergoing orthodontic treatment, it was possible to determine that female sex hormones affect the effectiveness of orthodontic treatment, and the optimal moment for TPA activation is the luteal phase of the menstrual cycle.
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Affiliation(s)
- Małgorzata Peruga
- Orthodontics Clinic, Dental Center of the Ministry of the Interior and Administration in Łódź, Północna 42, 91-425 Łódź, Poland
| | - Joanna Lis
- Department of Dentofacial Orthopaedics and Orthodontics, Wroclaw Medical University, Krakowska 26, 50-425 Wrocław, Poland
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Raza MA, Khan JA, Akhtar H, Farooqui WA, Faraz H, Hasan A. Comparison of two composite resin materials for splinting of dental luxation injuries: A double blind randomized controlled trial. Dent Traumatol 2024; 40:44-53. [PMID: 37615239 DOI: 10.1111/edt.12883] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/02/2023] [Revised: 07/11/2023] [Accepted: 08/09/2023] [Indexed: 08/25/2023]
Abstract
BACKGROUND/AIM Luxation is a common traumatic dental injury treated with a wire composite (WC) splint. However, bulk-fill flowable composite and conventional packable composite have not been compared for retaining these splints. Therefore, the objectives of this randomized controlled trial were (1) to compare retention of WC splints, and (2) to compare adhesive point dimension, application and removal time, and effect on tooth mobility between the two WC splints. MATERIALS AND METHODS In this parallel group, non-inferiority double blind randomized controlled trial, a total of 90 patients, aged 16-50 years participated. They were randomly allocated into two groups, the packable composite group (PC) n = 45 and the bulk-fill flowable composite group (BF-FC) n = 45 by lottery method. Following measurements were taken at the splint application appointment. Horizontal tooth mobility measured via Periotest, splint application time, and frontal images of splinted teeth to measure the percentage composite adhesive point area. After 2 weeks, splints were visually inspected for retention, whereas mobility and removal times were also recorded. Statistically, comparisons were made using independent samples sample T-test, Fisher's exact test, and Mann-Whitney U at p ≤ .05. RESULTS A total of 88 patients with 156 luxated teeth completed the trial, as two patients were lost to follow-up. Two patients in the PC group reported with completely de-bonded splints while none de-bonded in the BF-FC group. Both groups were similar in terms of splint retention (p = .352), reduction of mobility (p = .426), and splint removal times (p = .372). The BF-FC group performed significantly better in adhesive point dimension percentages (p < .001) and splint application time (p < .001). CONCLUSION Both groups were comparable in most parameters of the study. However, for BF-FC group application time and adhesive point dimension were significantly less.
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Affiliation(s)
- Misbah Ali Raza
- Department of Operative Dentistry, Dow Dental College, Dow University of Health Sciences Baba-e-Urdu Road Karachi, Karachi, Pakistan
| | - Javeria Ali Khan
- Department of Operative Dentistry, Dow Dental College, Dow University of Health Sciences Baba-e-Urdu Road Karachi, Karachi, Pakistan
| | - Hira Akhtar
- Department of Operative Dentistry, Dow Dental College, Dow University of Health Sciences Baba-e-Urdu Road Karachi, Karachi, Pakistan
| | | | - Hira Faraz
- Department of Operative Dentistry, Dow Dental College, Dow University of Health Sciences Baba-e-Urdu Road Karachi, Karachi, Pakistan
| | - Arshad Hasan
- Department of Operative Dentistry, Dow Dental College, Dow University of Health Sciences Baba-e-Urdu Road Karachi, Karachi, Pakistan
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Tu Y, Zhao X, Zhao G, Ding Q, Sun Y, Zhang L. Assessment of physiological posterior-tooth displacement under habitual occlusal force by intraoral scanning using implant-supported crowns as the reference. J Prosthet Dent 2023:S0022-3913(23)00422-5. [PMID: 37500342 DOI: 10.1016/j.prosdent.2023.06.019] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/23/2023] [Revised: 06/22/2023] [Accepted: 06/22/2023] [Indexed: 07/29/2023]
Abstract
STATEMENT OF PROBLEM Studies that have used digital methods to quantitatively evaluate physiological tooth displacement under occlusal force are sparse. PURPOSE The purpose of this clinical study was to measure physiological posterior tooth displacement under occlusal force by intraoral scanning and reverse engineering technology by using implants as the reference. MATERIAL AND METHODS A total of 14 participants received 15 implant-supported single mandibular first molar crowns. The surface data of maxillary and mandibular posterior teeth (U1 and L1) and the buccal occlusal data in the maximum intercuspal position (MIP) with habitual occlusal force were obtained by using an intraoral scanner (TRIOS 3, v20.1.2). The U1 and L1 data were segmented into single teeth, which were then aligned to the buccal occlusal data by using the "best-fit alignment" command to build the data under occlusal force (U2 and L2). U1 and L1 data were compared with U2 and L2 data to calculate the centroid and functional cusp vertex displacements and the long axis deflections of the second premolars and second molars, taking the first molar as the reference. The medians, and first quartile (Q1), third quartile (Q3) of the above data were reported, and the Shapiro-Wilk and Wilcoxon tests were used to analyze the differences (α=.05). RESULTS Under occlusal force, the median (Q1, Q3) centroid displacements of posterior teeth ranged from 61 (52, 101) μm to 146 (80, 186) μm; the functional cusp vertex displacements ranged from 82 (62, 117) μm to 146 (98, 189) μm, and the long axis deflections ranged from 0.45 (0.25, 0.87) degrees to 1.03 (0.52, 1.41) degrees. Mandibular second premolars displaced lingually, mesially, and apically; mandibular second molars displaced distally and apically; and maxillary second premolars and second molars displaced lingually and apically. CONCLUSIONS A digital method taking implant-supported single crowns as the reference was used to demonstrate physiological posterior-tooth displacement under habitual occlusal force.
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Affiliation(s)
- Ya Tu
- Graduate student, Department of Prosthodontics, Peking University School and Hospital of Stomatology & National Center for Stomatology & National Clinical Research Center for Oral Diseases & National Engineering Research Center of Oral Biomaterials and Digital Medical Devices, Beijing, PR China
| | - Xiaole Zhao
- Graduate student, Department of Prosthodontics, Peking University School and Hospital of Stomatology & National Center for Stomatology & National Clinical Research Center for Oral Diseases & National Engineering Research Center of Oral Biomaterials and Digital Medical Devices, Beijing, PR China
| | - Guangpu Zhao
- Graduate student, Department of Prosthodontics, Peking University School and Hospital of Stomatology & National Center for Stomatology & National Clinical Research Center for Oral Diseases & National Engineering Research Center of Oral Biomaterials and Digital Medical Devices, Beijing, PR China
| | - Qian Ding
- Attending Physician, Department of Prosthodontics, Peking University School and Hospital of Stomatology & National Center for Stomatology & National Clinical Research Center for Oral Diseases & National Engineering Research Center of Oral Biomaterials and Digital Medical Devices, Beijing, PR China.
| | - Yuchun Sun
- Professor, Center of Digital Dentistry, Department of Prosthodontics, Peking University School and Hospital of Stomatology & National Center for Stomatology & National Clinical Research Center for Oral Diseases & National Engineering Research Center of Oral Biomaterials and Digital Medical Devices & Beijing Key Laboratory of Digital Stomatology & NHC Research Center of Engineering and Technology for Computerized Dentistry, Beijing, PR China
| | - Lei Zhang
- Professor, Department of Prosthodontics, Peking University School and Hospital of Stomatology & National Center for Stomatology & National Clinical Research Center for Oral Diseases & National Engineering Research Center of Oral Biomaterials and Digital Medical Devices, Beijing, PR China
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Peruga M, Piwnik J, Lis J. The Impact of Progesterone and Estrogen on the Tooth Mobility. MEDICINA (KAUNAS, LITHUANIA) 2023; 59:medicina59020258. [PMID: 36837459 PMCID: PMC9965278 DOI: 10.3390/medicina59020258] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 12/27/2022] [Revised: 01/19/2023] [Accepted: 01/24/2023] [Indexed: 01/31/2023]
Abstract
Background and Objectives: Progesterone and estrogen modify the bone metabolism directly related to the periodontium, this study aimed at answering the question whether fluctuations in the levels of these hormones or the use of their synthetic equivalents in modern contraceptives have a significant impact on the natural tooth mobility (TM) in its alveolus. Materials and Methods: Sixty healthy women who had never been pregnant and when interviewed reported either (1) having regular menstruations every 28-30 days or (2) taking oral two-phase two-ingredient hormonal contraceptives formed, respectively, groups M and S in the study. TM evaluated as the Periotest value (PTV) was checked in the menstruation, ovulation, and luteal phases of the menstrual cycle (group M) and on the days corresponding to the moment of the menstrual cycle in group S. Results: Although the PTV-s were within the limits of norm, the canines and the molars were always more stable than the other teeth. In group M, the TM was statistically comparable (p > 0.05) in the menstrual and ovulation phases, thus significantly increased (p < 0.001) in the luteal phase. The TM remained constant (p = 0.758) in all studies in group S. The results demonstrated that the canines and the molars in the luteal phase were significantly more mobile in group M than in group S (p < 0.001), although increased mobility of the teeth in group M affected the canines and the first molars to a significantly lesser degree than the other teeth. Conclusions: However, since women between 20 and 30 years old constitute the majority of ortho-dontic patients, possible determination of the optimum moment of force application in relation to the sex hormones cycle, namely, to its luteal phase, is clinically very promising.
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Affiliation(s)
| | - Joanna Piwnik
- Physics and Applied Informatics, 92-321 Łódź, Poland
| | - Joanna Lis
- Adult Orthodontics Clinic, Department of Dentofacial Orthopedics and Orthodontics, Wroclaw Medical University, 50-376 Wrocław, Poland
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Aravind A, Kumar V, Sharma S, Chawla A, Logani A. Influence of preoperative degree of tooth loosening and thickness of wire on the rigidity of wire composite splint. J Conserv Dent 2021; 24:451-456. [PMID: 35399774 PMCID: PMC8989172 DOI: 10.4103/jcd.jcd_259_21] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/18/2021] [Revised: 07/29/2021] [Accepted: 09/06/2021] [Indexed: 11/04/2022] Open
Abstract
Context A wire composite splint (WCS) is most commonly used in clinical practice for the management of luxation dental injuries (LDIs). Wire thickness and adhesive point dimensions influence the rigidity of WCS. However, the influence of presplint tooth mobility on the rigidity of splint is not yet addressed. Aim The aim of this study is to identify the optimal thickness of WCS that achieves physiologic mobility in teeth with varying degrees of loosening (DoL) in a simulated LDI model. Settings and Design In vitro study. Materials and Methods Three typodont models with resin teeth were used. Right central incisor (Tooth 11) was simulated as an injured tooth and adjacent right lateral and left central incisor teeth (12 and21) acted as uninjured teeth. Each typodont model was modified to reproduce DoL 1, 2, and 3 in tooth 11 and categorized as Groups I, II, and III, respectively. The simulated injured tooth 11 was splinted with adjacent teeth 12 and 21 using 0.3, 0.5, and 0.8 mm WCS. Postsplinting DoL was assessed with Periotest. Statistical Analysis Used Two-way ANOVA and post hoc Tukey test were used for intragroup and intergroup comparisons of pre- and postsplinting Periotest values (PTVs). Friedman's two-way ANOVA and Kruskal-Wallis test were used for the intragroup and intergroup comparison of splint effect. Results Irrespective of the thickness of WCS, the postsplint PTVs corresponding to DoL 0 for simulated injured right central incisor tooth (11) were not achieved in Groups II and III. In three study groups, there was no statistically significant difference in the splint effect produced by 0.3 mm versus 0.5 mm WCS or 0.5 mm versus 0.8 mm WCS for tooth 11. Conclusions The postsplint DoL for a luxated tooth is affected by both the degree of presplint tooth mobility and the thickness of the wire.
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Affiliation(s)
- Archana Aravind
- Division of Conservative Dentistry and Endodontics, Centre for Dental Education and Research, All India Institute of Medical Sciences, New Delhi, India
| | - Vijay Kumar
- Division of Conservative Dentistry and Endodontics, Centre for Dental Education and Research, All India Institute of Medical Sciences, New Delhi, India
| | - Sidhartha Sharma
- Division of Conservative Dentistry and Endodontics, Centre for Dental Education and Research, All India Institute of Medical Sciences, New Delhi, India
| | - Amrita Chawla
- Division of Conservative Dentistry and Endodontics, Centre for Dental Education and Research, All India Institute of Medical Sciences, New Delhi, India
| | - Ajay Logani
- Division of Conservative Dentistry and Endodontics, Centre for Dental Education and Research, All India Institute of Medical Sciences, New Delhi, India
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Vilela ABF, Soares PBF, Beaini TL, Versluis A, Soares CJ. Splint stiffness and extension effects on a simulated avulsed permanent incisor-A patient-specific finite element analysis. Dent Traumatol 2021; 38:53-61. [PMID: 34309197 DOI: 10.1111/edt.12705] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/02/2021] [Revised: 06/23/2021] [Accepted: 06/24/2021] [Indexed: 12/15/2022]
Abstract
BACKGROUND/AIM Splinting is an important procedure after avulsion. However, the role of splint stiffness and extension is not fully understood. The aim of this study was to evaluate the effect of splint stiffness and extensions on the mobility and stress on an injured tooth under physiological biting load. MATERIALS AND METHODS Three-dimensional (3D) finite element models were created from a cone beam computer tomogram of a patient with normal occlusion. An avulsion injury of the right central incisor was created with a 1000 N load application on the palatal of the injured tooth, causing increased socket width. Splints made from four materials were tested: 0.9 mm diameter wire-composite splint (WCS1), 0.4 mm diameter wire-composite splint (WCS2), 1.0 mm diameter nylon-composite splint (NCS), and a 2 mm high by 0.2 mm thick plastic strip composite splint (PSS). Three splint extensions (involving 6, 5, and 3 teeth) were evaluated. Mobility of the avulsed tooth and the maximum principal stress distributions in the adjacent teeth were calculated. RESULTS The injured incisor tooth mobility was not affected by the splint extensions. The NCS and PSS stabilized the avulsed incisor but allowed, respectively, 10 and 20 times more mobility under horizontal loading than the WCS1, which inhibited most mobility, while the WCS2 allowed double the mobility compared with WCS1. The NCS and PSS allowed more tooth mobility, mainly in the extrusion direction. Splints were 2-3 times more effective in limiting mobility under intrusive loads than extrusive loads. High levels of stress were found at the base of the composite attachments in the adjacent incisors. CONCLUSION Splinting an avulsed tooth to one or two teeth bilaterally using a nylon splint or a plastic strip is appropriate for tooth stabilization and should be recommended over the 0.4mm wire-composite splint, while the 0.9 mm orthodontic wire is too rigid and not recommended.
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Affiliation(s)
- Andomar Bruno Fernandes Vilela
- Department of Operative Dentistry and Dental Materials, Dental School, Federal University of Uberlândia, Uberlândia, Brazil
| | | | - Thiago Leite Beaini
- Department of Preventive and Social Dentistry, Federal University of Uberlândia, Uberlândia, Brazil
| | - Antheunis Versluis
- Department of Bioscience Research, College of Dentistry, University of Tennessee Health Science Center, Memphis, TN, USA
| | - Carlos José Soares
- Department of Operative Dentistry and Dental Materials, Dental School, Federal University of Uberlândia, Uberlândia, Brazil
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Mohamed M, Moheb D, Waly N, Abdalsamad A, Elkhadem A. Effects of different splinting times on surgically extruded teeth with a crown-root fracture: A randomized controlled trial. Dent Traumatol 2020; 37:264-274. [PMID: 33179388 DOI: 10.1111/edt.12624] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/19/2020] [Revised: 09/09/2020] [Accepted: 09/09/2020] [Indexed: 11/30/2022]
Abstract
BACKGROUND/AIM Clinical studies evaluating the splinting time for surgically extruded teeth with crown-root fractures are lacking. The aim of this study was to compare 2-week splinting versus functional splinting times after surgical extrusion. MATERIAL AND METHODS Children aged 8-13 years who presented with crown-root fractures were included. Surgical extrusion was performed, and teeth were splinted either for 2 weeks or until normal Periotest values were achieved (functional splinting time). The outcome measures were tooth mobility, tooth loss, root resorption, marginal bone resorption and ankylosis. Measurements were taken at baseline, weekly after splint removal, and after 1, 3, 6 and 12 months. RESULTS Nineteen patients were included in the analysis. Surgically extruded teeth splinted for 2 weeks showed significantly higher mobility directly after splint removal and at 1 month after splinting compared with the functional splinting time group. The mean differences for horizontal Periotest values were 14.96 (95% confidence interval: 8.52, 21.39) and 6.63 (95% confidence interval: 0.25, 13), respectively. The vertical Periotest values were 10.47 (95% confidence interval: 1.95, 18.99) and 4.81 (95% confidence interval: -1.57, 11.18), respectively. At the 3-, 6- and 12-month follow-up intervals, there were no statistically significant differences between the groups. One tooth in the 2-week splinting group was lost. None of the teeth had ankylosis, marginal bone resorption or root resorption. CONCLUSIONS Although both groups showed neither statistical nor clinically significant differences after 12 months, there was a significant difference immediately after splint removal, with greater tooth mobility in the 2-week splinting group. Thus, a functional splinting time (4-6 weeks) can be suggested for better healing and optimal stability to allow placement of the final restoration directly after splint removal.
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Affiliation(s)
- Maii Mohamed
- Pediatric Dentistry Department, Faculty of Dentistry, Cairo University, Cairo, Egypt
| | - Dalia Moheb
- Pediatric Dentistry Department, Faculty of Dentistry, Cairo University, Cairo, Egypt
| | - Nevine Waly
- Pediatric Dentistry Department, Faculty of Dentistry, Cairo University, Cairo, Egypt
| | - Ahmad Abdalsamad
- Department of Oral Radiology, Faculty of Dentistry, Cairo University, Cairo, Egypt
| | - Ahmed Elkhadem
- Pediatric Dentistry Department, Faculty of Dentistry, Cairo University, Cairo, Egypt
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Khalaila W, Nasser M, Ormianer Z. Evaluation of the relationship between Periotest values, marginal bone loss, and stability of single dental implants: A 3-year prospective study. J Prosthet Dent 2019; 124:183-188. [PMID: 31780107 DOI: 10.1016/j.prosdent.2019.08.023] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/21/2019] [Revised: 08/28/2019] [Accepted: 08/28/2019] [Indexed: 10/25/2022]
Abstract
STATEMENT OF PROBLEM Although the Periotest has been shown to provide reliable information about initial implant stability, whether Periotest values (PTVs) can be correlated with the stability of implants in function for several years is unclear. PURPOSE The purpose of this prospective clinical study was to investigate implant stability by using PTVs, as well as changes in stability and peri-implant marginal bone levels (as measured by radiographs) over a 3-year follow-up period. The exploratory hypothesis was that there is a significant correlation between PTVs and bone loss around the implant and that PTVs can provide predictive information about marginal bone-level changes and implant stability over time. MATERIAL AND METHODS The study population included patients who needed single-tooth replacement with restoration of cemented fixed partial dentures. Clinical data, PTVs, and periapical radiographs were collected at the time points of implant placement, 3 to 6 months after insertion, and 1 year, 2 years, and 3 years after the final definitive prosthetic restoration. Pearson correlation coefficient tests were performed to estimate the correlation between the PTVs received at the first follow-up time point and the subsequent PTVs received during the follow-up period (up to 3 years after the restoration). The Pearson test was applied, as well as the t test and repeated-measures ANOVA, to evaluate PTVs and bone loss changes over time. The Pearson test was also applied to estimate the correlation between the bone loss values measured at the first follow-up visit and the subsequent bone loss values at the annual follow-up time points (up to and including 3 years after the restoration). RESULTS A total of 43 implants were inserted in 34 patients (26 men and 8 women); the average patient age was 52.8 years. A significant reduction in implant stability was detected between implant insertion and the 3- to 6-month follow-up time point, which was then followed by a significant increase in stability at the 1-year follow-up time point and then stabilized during the 2- and 3-year follow-up time points (P<.014). Furthermore, a significant correlation was found between PTVs at the 1-year follow-up and the PTVs at all measured follow-up time points (P<.05). A positive correlation was obtained with high-strength correlation coefficient R (R>0.7) at all follow-up time points. Bone loss changes during the follow-up time points were significantly different and correlated with PTVs (P<.001). CONCLUSIONS The Periotest is a reliable device for assessing implant stability and providing predictive information about marginal bone level changes around an implant.
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Affiliation(s)
- Waseem Khalaila
- Graduate student, Department of Oral Rehabilitation, The Maurice and Gabriela Goldschleger School of Dental Medicine, Tel Aviv University, Tel Aviv, Israel
| | - Minaem Nasser
- Graduate student, Department of Oral Rehabilitation, The Maurice and Gabriela Goldschleger School of Dental Medicine, Tel Aviv University, Tel Aviv, Israel
| | - Zeev Ormianer
- Senior Lecturer, Department of Oral Rehabilitation, The Maurice and Gabriela Goldschleger School of Dental Medicine, Tel Aviv University, Tel Aviv, Israel.
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Comparative Evaluation of Flexural Strength and Flexural Modulus of Different Periodontal Splint Materials: An In Vitro Study. APPLIED SCIENCES-BASEL 2019. [DOI: 10.3390/app9194197] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
Splinting of the mobile teeth is a critical part of periodontal management to improve the prognosis and longevity of stable results of periodontally compromised teeth with increased mobility. Different types of splints are used in the dental field based on their mechanical and physical properties.The objective of the current in vitro study was to evaluate the flexure strength and flexural modulus of different types of splinting materials, such as: composite block, ligature wire, Ribbond®, InFibra®, and F-splint-Aid® bonded utilizing Flowable composites resin material. Seventy-five bar specimens were prepared with the dimensions of 25 × 4 × 2 mm, utilizing split metallic mold. Specimens were divided equally (n = 15) into five groups (one control group, four test groups). Different layers of splinting material were placed in between the layers of composite before curing. All the specimens were subjected to a three-point bending test by using a universal testing machine to calculate the flexural strength and flexural modulus. The entire data was subjected to statistical tests to evaluate the significance. Specimens from composite block groups showed the least mean value for flexural strength (89.15 ± 9.70 MPa) and flexural modulus (4.310 ± 0.912 GPa). Whereas, the highest mean value for flexural strength (168.04 ± 45.95 MPa) and flexural modulus (5.861 ± 0.501 GPa) were recorded by Ribbond® specimens. Inter group comparison of flexural strength showed statistically significant differences (P-value < 0.05), whereas comparison of flexural modulus showed non-significant difference among the groups (P-value > 0.05). Within the limitation of the present study, it was concluded that the Ribbond® exhibits maximum flexural strength and flexural modulus, whereas the composite blocks recorded the least values. Still, the decision making depends on the clinical scenario and the unique characteristic of each splint material.
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Shirako T, Churei H, Wada T, Uo M, Ueno T. Establishment of experimental models to evaluate the effectiveness of dental trauma splints. Dent Mater J 2017; 36:731-739. [PMID: 28652553 DOI: 10.4012/dmj.2016-333] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
The purpose was to describe a novel simple experimental model of injured teeth for developing dental trauma splints (DTS), and to test various splints by combining use of this model and the Periotest® device. Rubber O-rings and spring washers were used to simulate and modify injured tooth mobility. Splinting effects were assessed among three kinds of DTS, including a composite splint and two wire-composite splints (1: rectangular orthodontic wire 0.533×0.635 mm, 2: cobalt-chromium alloy wire Φ0.9 mm). The Periotest values were measured three times for each tooth before and after splint insertion. The splinting effect was defined as the change in tooth mobility. Splinting effects significantly increased in the order wire-composite splint 1<wire-composite splint 2<composite splint (p<0.05). This model system could evaluate the effects of DTS including the differences among various splint methods, which showed reasonable reproducibility of dental trauma situations depending on severity in clinical usage.
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Affiliation(s)
- Takahiro Shirako
- Department of Sports Medicine/Dentistry, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University
| | - Hiroshi Churei
- Department of Sports Medicine/Dentistry, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University
| | - Takahiro Wada
- Department of Advanced Biomaterials, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University
| | - Motohiro Uo
- Department of Advanced Biomaterials, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University
| | - Toshiaki Ueno
- Department of Sports Medicine/Dentistry, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University
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Shirako T, Churei H, Iwasaki N, Takahashi H, Ueno T. Evaluation of the flexural properties of a new temporary splint material for use in dental trauma splints. J Dent Sci 2017; 12:308-310. [PMID: 30895067 PMCID: PMC6399998 DOI: 10.1016/j.jds.2017.02.003] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/06/2016] [Revised: 01/19/2017] [Indexed: 11/23/2022] Open
Abstract
The present study evaluated the flexural properties of a new temporary splint material, G-Fix, for use in dental trauma splints in comparison with other resin materials. Four types of resin materials were considered in the present study: MI Flow II, light-cured composite resin (MI); G-Fix, light-cured resin for splinting teeth (GF); Super-Bond C&B, adhesive resin cement (SB); and Unifast III, self-cured methyl-methacrylate resin (UF). The flexural properties of these four materials were tested according to ISO 4049. The flexural strength significantly increased in the order of UF (64.9 MPa) < SB (76.5 MPa) < GF (94.3 MPa) < MI (161.2 MPa). The elastic modulus significantly increased in the order of UF (2.11 GPa) ≒ SB (2.23 GPa) < GF (2.62 GPa) < MI (7.39 GPa). A splint made of GF may be more flexible than a composite splint, which is categorized as a rigid splint.
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Affiliation(s)
- Takahiro Shirako
- Department of Sports Medicine/Dentistry, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University, Tokyo, Japan
| | - Hiroshi Churei
- Department of Sports Medicine/Dentistry, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University, Tokyo, Japan
| | - Naohiko Iwasaki
- Department of Oral Biomaterials Development Engineering, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University, Tokyo, Japan
| | - Hidekazu Takahashi
- Department of Oral Biomaterials Development Engineering, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University, Tokyo, Japan
| | - Toshiaki Ueno
- Department of Sports Medicine/Dentistry, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University, Tokyo, Japan
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Ho KN, Lee SY, Huang HM. Damping ratio analysis of tooth stability under various simulated degrees of vertical alveolar bone loss and different root types. Biomed Eng Online 2017; 16:97. [PMID: 28774336 PMCID: PMC5543751 DOI: 10.1186/s12938-017-0388-x] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/22/2017] [Accepted: 07/26/2017] [Indexed: 11/21/2022] Open
Abstract
Background The purpose of this study was to evaluate the feasibility of using damping ratio (DR) analysis combined with resonance frequency (RF) and periotest (PTV) analyses to provide additional information about natural tooth stability under various simulated degrees of alveolar vertical bone loss and various root types. Methods Three experimental tooth models, including upper central incisor, upper first premolar, and upper first molar were fabricated using Ti6Al4V alloy. In the tooth models, the periodontal ligament and alveolar bone were simulated using a soft lining material and gypsum, respectively. Various degrees of vertical bone loss were simulated by decreasing the surrounding bone level apically from the cementoenamel junction in 2-mm steps incrementally downward for 10 mm. A commercially available RF analyzer was used to measure the RF and DR of impulse-forced vibrations on the tooth models. Results The results showed that DRs increased as alveolar vertical bone height decreased and had high coefficients of determination in the linear regression analysis. The damping ratio of the central incisor model without a simulated periodontal ligament were 11.95 ± 1.92 and 27.50 ± 0.67% respectively when their bone levels were set at 2 and 10 mm apically from the cementoenamel junction. These values significantly changed to 28.85 ± 2.54% (p = 0.000) and 51.25 ± 4.78% (p = 0.003) when the tooth model was covered with simulated periodontal ligament. Moreover, teeth with different root types showed different DR and RF patterns. Teeth with multiple roots had lower DRs than teeth with single roots. Conclusion Damping ratio analysis combined with PTV and RF analysis provides more useful information on the assessment of changes in vertical alveolar bone loss than PTV or RF analysis alone.
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Affiliation(s)
- Kuo-Ning Ho
- School of Dentistry, Taipei Medical University, 250, Wu-Hsing Street, Taipei, Taiwan
| | - Sheng-Yang Lee
- School of Dentistry, Taipei Medical University, 250, Wu-Hsing Street, Taipei, Taiwan.
| | - Haw-Ming Huang
- School of Dentistry, Taipei Medical University, 250, Wu-Hsing Street, Taipei, Taiwan. .,Graduate Institute of Biomedical Optomechatronics, Taipei Medical University, Taipei, Taiwan.
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Evaluation of Qualitative Changes in Simulated Periodontal Ligament and Alveolar Bone Using a Noncontact Electromagnetic Vibration Device with a Laser Displacement Sensor. BIOMED RESEARCH INTERNATIONAL 2016; 2016:9636513. [PMID: 27274995 PMCID: PMC4870357 DOI: 10.1155/2016/9636513] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/05/2015] [Accepted: 04/19/2016] [Indexed: 11/30/2022]
Abstract
Evaluating periodontal tissue condition is an important diagnostic parameter in periodontal disease. Noncontact electromagnetic vibration device (NEVD) was previously developed to monitor this condition using mechanical parameters. However, this system requires accelerometer on the target tooth. This study assessed application of laser displacement sensor (LDS) to NEVD without accelerometer using experimental tooth models. Tooth models consisted of cylindrical rod, a tissue conditioner, and polyurethane or polyurethane foam to simulate tooth, periodontal ligament, and alveolar bone, respectively. Tissue conditioner was prepared by mixing various volumes of liquid with powder. Mechanical parameters (resonant frequency, elastic modulus, and coefficient of viscosity) were assessed using NEVD with the following methods: Group A, measurement with accelerometer; Group B, measurement with LDS in the presence of accelerometer; and Group C, measurement with LDS in the absence of accelerometer. Mechanical parameters significantly decreased with increasing liquid volume. Significant differences were also observed between the polyurethane and polyurethane foam models. Meanwhile, no statistically significant differences were observed between Groups A and B; however, most mechanical parameters in Group C were significantly larger and more distinguishable than those of Groups A and B. LDS could measure mechanical parameters more accurately and clearly distinguished the different periodontal ligament and alveolar bone conditions.
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Kobayashi H, Yamaoka M, Hayashi M, Ogiso B. Use of a laser displacement sensor with a non-contact electromagnetic vibration device for assessment of simulated periodontal tissue conditions. J Oral Sci 2016; 58:93-9. [PMID: 27021545 DOI: 10.2334/josnusd.58.93] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/01/2022]
Abstract
A non-contact electromagnetic vibration device (NEVD) was previously developed to monitor the condition of periodontal tissues by assessing mechanical parameters. This system requires placement of an accelerometer on the target tooth, to detect vibration. Using experimental tooth models, we evaluated the performance of an NEVD system with a laser displacement sensor (LDS), which does not need an accelerometer. Simulated teeth (polyacetal rods) were submerged at various depths in simulated bone (polyurethane or polyurethane foam) containing simulated periodontal ligament (tissue conditioner). Then, mechanical parameters (resonant frequency, elastic modulus, and viscosity coefficient) were assessed using the NEVD with the following detection methods: Group 1, measurement with an accelerometer; Group 2, measurement with an LDS in the presence of the accelerometer; and Group 3, measurement with an LDS in the absence of the accelerometer. Statistical analyses were performed using nonparametric methods (n = 5) (P < 0.05). The three mechanical parameters significantly increased with increasing depth. In addition, the mechanical parameters significantly differed between the polyurethane and polyurethane foam models. Although Groups 1 and 2 did not significantly differ, most all mechanical parameters in Group 3 were significantly larger and more distinguishable than those in Groups 1 and 2. The LDS was more accurate in measuring mechanical parameters and better able to differentiate periodontal tissue conditions. (J Oral Sci 58, 93-99, 2016).
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Affiliation(s)
- Hiroshi Kobayashi
- Division of Applied Oral Sciences, Nihon University Graduate School of Dentistry
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Zhu Y, Chen H, Cen L, Wang J. Influence of abutment tooth position and adhesive point dimension on the rigidity of a dental trauma wire-composite splint. Dent Traumatol 2015; 32:225-30. [PMID: 26511774 DOI: 10.1111/edt.12241] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 09/27/2015] [Indexed: 10/22/2022]
Affiliation(s)
- Yuqing Zhu
- Department of Pediatric Dentistry; School of Stomatology; Ninth People's Hospital; Medical College; Shanghai Jiaotong University; Shanghai China
| | - Hui Chen
- Department of Pediatric Dentistry; School of Stomatology; Ninth People's Hospital; Medical College; Shanghai Jiaotong University; Shanghai China
| | - Lian Cen
- National Tissue Engineering Center of China; Shanghai China
- School of Chemical Engineering; East China University of Science and Technology; Shanghai China
| | - Jun Wang
- Department of Pediatric Dentistry; School of Stomatology; Ninth People's Hospital; Medical College; Shanghai Jiaotong University; Shanghai China
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Falkensammer F, Rausch-Fan X, Schaden W, Kivaranovic D, Freudenthaler J. Impact of extracorporeal shockwave therapy on tooth mobility in adult orthodontic patients: a randomized single-center placebo-controlled clinical trial. J Clin Periodontol 2015; 42:294-301. [DOI: 10.1111/jcpe.12373] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 01/22/2015] [Indexed: 01/09/2023]
Affiliation(s)
- Frank Falkensammer
- Department of Orthodontics; University Clinic of Dentistry; Medical University of Vienna; Vienna Austria
| | - Xiaohui Rausch-Fan
- Department of Orthodontics and Oral Biology; University Clinic of Dentistry; Medical University of Vienna; Vienna Austria
| | - Wolfgang Schaden
- Allgemeine Unfallversicherungsanstalt; Trauma Center Meidling; Ludwig Boltzmann Institute for Experimental and Clinical Traumatology; Vienna Austria
- Austrian Cluster for Tissue Regeneration; Vienna Austria
| | - Danijel Kivaranovic
- Section for Medical Statistics; Center for Medical Statistics, Informatics and Intelligent Systems; Medical University of Vienna; Vienna Austria
| | - Josef Freudenthaler
- Department of Orthodontics; University Clinic of Dentistry; Medical University of Vienna; Vienna Austria
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Franz F, Potapov S, Petschelt A, Berthold C. Influence of adhesive point dimension and splint type on splint rigidity - Evaluation by the dynamic Periotest method. Dent Traumatol 2012; 29:203-11. [DOI: 10.1111/j.1600-9657.2012.01164.x] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 06/03/2012] [Indexed: 01/07/2023]
Affiliation(s)
- Florian Franz
- Clinic Dr. Petschelt & Colleagues; Lauf a. d. Pegnitz; Germany
| | - Sergej Potapov
- Institute for Medical Informatics, Biometry and Epidemiology; Friedrich-Alexander-University; Erlangen; Germany
| | - Anselm Petschelt
- Dental Clinic 1 - Operative Dentistry and Periodontology; Friedrich-Alexander-University; Erlangen; Germany
| | - Christine Berthold
- Dental Clinic 1 - Operative Dentistry and Periodontology; Friedrich-Alexander-University; Erlangen; Germany
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Relation between insertion torque and bone-implant contact percentage: an artificial bone study. Clin Oral Investig 2012; 16:1679-84. [PMID: 22228023 DOI: 10.1007/s00784-011-0658-0] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/22/2011] [Accepted: 12/08/2011] [Indexed: 10/14/2022]
Abstract
OBJECTIVES The purpose of this study was to determine the correlation between the peak insertion torque value (ITV) of a dental implant and the bone-implant contact percentage (BIC%). MATERIAL AND METHODS Dental implants were inserted into specimens comprising a 2-mm-thick artificial cortical shell representing cortical bone and artificial foam bone representing cancellous bone with four densities (groups 1 to 4--0.32, 0.20, 0.16, and 0.12 g/cm(3)). Each specimen with an inserted implant was subjected to micro-computed tomography (micro-CT) scanning, from which the 3D BIC% values were calculated. Pearson's correlation coefficients (r) between the ITV and BIC% were calculated. RESULTS The ITVs in groups 1 to 4 were 56.2 ± 4.6 (mean±standard deviation), 45.6 ± 0.9, 43.3 ± 4.3, and 38.5 ± 3.4 N cm, respectively, and the corresponding BIC% values were 41.5 ± 0.5%, 39.0 ± 1.0%, 30.8 ± 1.1%, and 26.2 ± 1.6%. Pearson's correlation coefficient between the ITV and BIC% was r = 0.797 (P < 0.0001). CONCLUSION The initial implant stability, quantified as the ITV, was strongly positively correlated with the 3D BIC% obtained from micro-CT images. CLINICAL RELEVANCE The ITV of a dental implant can be used to predict the initial BIC%; this information may provide the clinician with important information on the optimal loading time.
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Goellner M, Berthold C, Holst S, Wichmann M, Schmitt J. Correlations between photogrammetric measurements of tooth mobility and the Periotest method. Acta Odontol Scand 2012; 70:27-35. [PMID: 21504267 DOI: 10.3109/00016357.2011.575080] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
OBJECTIVE The purpose of the present study was to investigate whether or not the quantitative Periotest values of anterior teeth correlate with quantitative metric values of tooth mobility under vertical (VL) and horizontal load (HL) in periodontally healthy subjects. MATERIALS AND METHODS Thirty-one subjects with good periodontal conditions were included and subjected to two different tooth mobility measurement techniques. Periotest values were measured at reproducible measurement points in the vertical (vPT) and horizontal (hPT) dimensions of upper central and lateral incisors and canine teeth. Using the optical measurement technique (photogrammetry), tooth mobility was measured under load in the horizontal (HL) and vertical loading directions (VL) at different load forces. Pearson's correlation coefficients were used to determine exploratory associations. RESULTS The comparison between hPT and HL showed no correlations between the two measurements except for 'weak' and 'moderate' correlations for teeth 21 and 23. The analysis of correlations between vPT and VL data showed statistically significant correlations for both the left and right canine teeth that ranged from 'weak' to 'high'. Comparisons between hPT values and VL and between vPT and HL showed significant correlations at a few loading forces only. CONCLUSION Quantitative Periotest values cannot be used to draw conclusions about the metric assessment of tooth mobility. For this purpose, the photogrammetric technique could be an additional tool for scientific questions.
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Affiliation(s)
- Matthias Goellner
- Dental Clinic 2, Department of Prosthodontics, University Clinic Erlangen, Germany.
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Kobayashi C, Hayashi M, Yamaoka M, Hashimoto K, Kato T, Komori N, Ogiso B. Assessing qualitative changes in simulated periodontal ligament and alveolar bone using a non-contact electromagnetic vibration device. Clin Oral Investig 2011; 16:1161-9. [PMID: 21809012 DOI: 10.1007/s00784-011-0597-9] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/14/2011] [Accepted: 07/19/2011] [Indexed: 11/26/2022]
Abstract
The objective of this study is to investigate the ability of a non-contact electromagnetic vibration device to assess a simulated periodontal ligament and alveolar bone conditions in experimental tooth models by applying mechanical parameters (resonant frequency, elastic modulus, and coefficient of viscosity). The non-contact electromagnetic vibration device was made up of three components: vibrator, detector, and analyzer. The experimental tooth model consisted of a cylindrical rod made of polyacetal, a tissue conditioner for soft lining material, and urethane or urethane foam to simulate the tooth, periodontal ligament, and alveolar bone, respectively. The tissue conditioner was prepared by mixing various volumes of liquid with powder. Periotest values (PTVs) were also measured under the same conditions as those of the non-contact electromagnetic vibration device. All of the mechanical parameters derived from the non-contact electromagnetic vibration device significantly decreased as the proportion of liquid increased. Values for the three parameters of the urethane models were significantly larger than those of the urethane foam models. In contrast, PTVs increased significantly as the proportion of liquid increased; however, no significant difference was observed between the urethane and urethane foam models. The non-contact electromagnetic vibration device may be capable of evaluating not only periodontal ligament conditions but also bone quality. Mechanical parameters may be useful for assessing qualitative changes in the periodontal ligament and alveolar bone.
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Affiliation(s)
- Chiaki Kobayashi
- Department of Endodontics, Nihon University School of Dentistry, 1-8-13 Kanda-Surugadai, Chiyoda-ku, Tokyo 101-8310, Japan
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Berthold C, Auer FJ, Potapov S, Petschelt A. Influence of wire extension and type on splint rigidity - evaluation by a dynamic and a static measuring method. Dent Traumatol 2011; 27:422-31. [DOI: 10.1111/j.1600-9657.2011.01033.x] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Berthold C, Auer FJ, Potapov S, Petschelt A. Rigidity evaluation of quartz-fiber splints compared with wire-composite splints. Dent Traumatol 2011; 28:65-74. [DOI: 10.1111/j.1600-9657.2011.01031.x] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Berthold C, Auer FJ, Potapov S, Petschelt A. In vitro splint rigidity evaluation - comparison of a dynamic and a static measuring method. Dent Traumatol 2011; 27:414-21. [DOI: 10.1111/j.1600-9657.2011.01034.x] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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Berthold C, Auer FJ, Potapov S, Petschelt A. Development of new artificial models for splint rigidity evaluation. Dent Traumatol 2011; 27:356-67. [DOI: 10.1111/j.1600-9657.2011.01010.x] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
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