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Assessment of the bone thickness of the palate on cone-beam computed tomography for placement of miniscrew-assisted rapid palatal expansion appliances. Am J Orthod Dentofacial Orthop 2022; 161:849-857. [DOI: 10.1016/j.ajodo.2021.01.037] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/01/2020] [Revised: 01/01/2021] [Accepted: 01/01/2021] [Indexed: 11/20/2022]
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Uchida Y, Namura Y, Inaba M, Osada A, Charleston-Coad T, Nakamura Y, Motoyoshi M. Influence of pre-drilling diameter on the stability of orthodontic anchoring screws in the mid-palatal area. J Oral Sci 2021; 63:270-274. [PMID: 34193778 DOI: 10.2334/josnusd.21-0012] [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] [Indexed: 11/01/2022]
Abstract
PURPOSE The aim of this study was to investigate the stability of orthodontic anchor screws (OASs) in the mid-palatal area according to pre-drilling diameter. METHODS The success rate of 161 OASs (83 patients, φ2.0 mm, 6.0 mm in length) placed in a corresponding area to the mesial and distal borders of the first molar (mesial zone and distal zone) was assessed according to placement location and pre-drilling diameter (1.2 and 1.5 mm). Placement torque values from 73 OASs with a pre-drilling diameter of 1.2 mm were compared between success and failure groups. RESULTS The success rates of OASs pre-drilled with φ1.2 and 1.5 mm were 94.5% and 83.0%, respectively (P < 0.05); corresponding rates in the mesial zone were 100.0% and 77.3% (P < 0.005), and those in the distal zone were 89.2% and 88.6%, respectively. Placement torques of OASs predrilled with φ1.2 mm in the success and failure groups were 25.9 and 19.2 N·cm, respectively (P < 0.05). CONCLUSION A smaller pre-drilling diameter was associated with a higher success rate of OASs in the mid-palatal area, especially in the mesial zone. When pre-drilling diameter of 1.2 mm was used for φ2.0 mm OAS, greater placement torque was indicative of greater OAS stability.
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Affiliation(s)
- Yasuki Uchida
- Department of Orthodontics, and Division of Clinical Research, Dental Research Center, Nihon University School of Dentistry
| | - Yasuhiro Namura
- Department of Orthodontics, and Division of Clinical Research, Dental Research Center, Nihon University School of Dentistry
| | - Mizuki Inaba
- Department of Orthodontics, and Division of Clinical Research, Dental Research Center, Nihon University School of Dentistry
| | - Ayaka Osada
- Department of Oral Structural and Functional Biology, Nihon University Graduate School of Dentistry
| | - Tasku Charleston-Coad
- Department of Oral Structural and Functional Biology, Nihon University Graduate School of Dentistry
| | - Yoshiki Nakamura
- Department of Oral Structural and Functional Biology, Nihon University Graduate School of Dentistry
| | - Mitsuru Motoyoshi
- Department of Orthodontics, and Division of Clinical Research, Dental Research Center, Nihon University School of Dentistry
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Ko YC, Tsai MT, Fuh LJ, Tsai MJ, Wang XH, Huang HL, Hsu JT. Association between Age of Menopause and Thickness of Crestal Cortical Bone at Dental Implant Site: A Cross-Sectional Observational Study. INTERNATIONAL JOURNAL OF ENVIRONMENTAL RESEARCH AND PUBLIC HEALTH 2020; 17:ijerph17165868. [PMID: 32823531 PMCID: PMC7460029 DOI: 10.3390/ijerph17165868] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/27/2020] [Revised: 08/08/2020] [Accepted: 08/09/2020] [Indexed: 11/16/2022]
Abstract
Satisfactory host bone quality and quantity promote greater primary stability and better osseointegration, leading to a high success rate in the use of dental implants. However, the increase in life expectancy as a result of medical advancements has led to an aging population, suggesting that osteoporosis may become a problem in clinical dental implant surgery. Notably, relative to the general population, bone insufficiency is more common in women with post-menopausal osteoporosis. The objective of this study was to compare the thickness of the crestal cortical bone at prospective dental implant sites between menopausal and non-menopausal women. Prospective dental implant sites in the jawbone were evaluated in two groups of women: a younger group (<50 years old), with 149 sites in 48 women, and an older group (>50 years old) with 191 sites, in 37 women. The thickness of the crestal cortical bone at the dental implant site was measured based on each patient’s dental cone-beam computed tomography images. For both groups, one-way analysis of variance and Tukey’s post-test were used to assess the correlation between cortical bone thickness and the presence of implants in the four jawbone regions. Student’s t-test was further used to compare differences between the older and younger groups. From the retrospective study results, for both groups, thickness of the crestal cortical bone was the highest in the posterior mandible, followed by anterior mandible, anterior maxilla, and posterior maxilla. Compared with the younger group, the older group had a lower mean thickness of the crestal cortical bone. Among the four regions, however, only in the posterior maxilla was the crestal cortical bone significantly thinner in the older group than in the younger group.
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Affiliation(s)
- Yi-Chun Ko
- School of Dentistry, China Medical University, Taichung 404, Taiwan; (Y.-C.K.); (L.-J.F.)
| | - Ming-Tzu Tsai
- Department of Biomedical Engineering, Hungkuang University, Taichung 433, Taiwan;
| | - Lih-Jyh Fuh
- School of Dentistry, China Medical University, Taichung 404, Taiwan; (Y.-C.K.); (L.-J.F.)
- Department of Dentistry, China Medical University and Hospital, Taichung 404, Taiwan;
| | - Min-Jia Tsai
- Department of Dentistry, China Medical University and Hospital, Taichung 404, Taiwan;
| | - Xuan-Hui Wang
- Master Program for Biomedical Engineering, China Medical University, Taichung 404, Taiwan;
| | - Heng-Li Huang
- School of Dentistry, China Medical University, Taichung 404, Taiwan; (Y.-C.K.); (L.-J.F.)
- Department of Bioinformatics and Medical Engineering, Asia University, Taichung 413, Taiwan
- Correspondence: (H.-L.H.); (J.-T.H.); Tel.: +886-4-22053366 (ext. 2306) (H.-L.H.); +886-4-22053366 (ext. 2308) (J.-T.H.)
| | - Jui-Ting Hsu
- School of Dentistry, China Medical University, Taichung 404, Taiwan; (Y.-C.K.); (L.-J.F.)
- Department of Bioinformatics and Medical Engineering, Asia University, Taichung 413, Taiwan
- Correspondence: (H.-L.H.); (J.-T.H.); Tel.: +886-4-22053366 (ext. 2306) (H.-L.H.); +886-4-22053366 (ext. 2308) (J.-T.H.)
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Lyu X, Guo J, Chen L, Gao Y, Liu L, Pu L, Lai W, Long H. Assessment of available sites for palatal orthodontic mini-implants through cone-beam computed tomography. Angle Orthod 2020; 90:516-523. [PMID: 33378492 PMCID: PMC8028458 DOI: 10.2319/070719-457.1] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/01/2019] [Accepted: 01/01/2020] [Indexed: 11/23/2022] Open
Abstract
OBJECTIVE To measure the palatal thickness of both hard and soft tissues and to determine safe regions for the placement of mini-implants. The influences of sex and age on palatal thickness were also examined. MATERIALS AND METHODS Cone-beam computed tomography images of 30 patients (12 males, 18 females), including 15 adults and 15 adolescents, were used in this study. The thicknesses of palatal hard tissue, soft tissue, and hard+soft tissues were measured at the coronal planes of first premolars, second premolars, first molars, and second molars (P1, P2, M1, and M2 planes, respectively). RESULTS The hard tissue was thickest at the P1 plane, followed by at the P2, M1, and M2 planes, while the thickness of soft tissue was similar among the four planes. The trends in the changes of palatal thickness from midline to the lateral sides (V-pattern) were similar for the four planes. Palatal thickness was influenced by sex, age, and their interaction. Mapping of recommended and optimal sites for palatal mini-implants was accomplished. CONCLUSIONS Sex and age factors could influence palatal thickness. Therefore, the findings might be helpful for clinicians in guiding them to choose the optimal sites for palatal mini-implants.
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Becker K, Unland J, Wilmes B, Tarraf NE, Drescher D. Is there an ideal insertion angle and position for orthodontic mini-implants in the anterior palate? A CBCT study in humans. Am J Orthod Dentofacial Orthop 2019; 156:345-354. [PMID: 31474264 DOI: 10.1016/j.ajodo.2018.09.019] [Citation(s) in RCA: 29] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/01/2018] [Revised: 09/01/2018] [Accepted: 09/01/2018] [Indexed: 02/06/2023]
Abstract
INTRODUCTION Orthodontic mini-implants are frequently used to provide additional anchorage for orthodontic appliances. The anterior palate is frequently used owing to sufficient bone quality and low risk of iatrogenic trauma to adjacent anatomical structures. Even though the success rates in this site are high, failure of an implant will result in anchorage loss. Therefore, implants should be placed in areas with sufficient bone quality. The aim of the present study was to identify an optimal insertion angle and position for orthodontic mini-implants in the anterior palate. METHODS Maxillary cone-beam computed tomographic (CBCT) scans from 30 patients (8 male, 22 female, age 18.6 ± 12.0 years) were analyzed. To assess the maximum possible length of an implant, a 25-reference-point grid was defined: 5 sagittal slices were extracted along the median plane and bilaterally at 3 mm and 6 mm distances, respectively. Within each slice, 5 dental reference points were projected to the palatal curvature at the contact point between the cuspid (C) and first bicuspid (PM1), midpoint of PM1, between PM1 and PM2, midpoint of PM2, and between PM2 and the first molar (M1). Measurements were conducted at -30°, -20°, -10°, 0°, 10°, 20°, and 30° to a vector placed perpendicular to the local palatal curvature. Statistical analysis was conducted with the use of R using a random-effects mixed linear model and a Tukey post hoc test with Holm correction. RESULTS High interindividual variability was detected. Maximum effective bone heights were detected within a T-shaped area at the midpoint of PM1 and contact point PM1-PM2 (P < 0.01). Within the anterior region a posterior tipping was advantageous, whereas in the posterior regions an anterior tipping was beneficial (P < 0.01). In the middle of the median plane, tipping did not reveal a significant influence. No gender- or age-related differences were observed. CONCLUSIONS Within the limitations of this study, optimal insertion positions were found within a T-shaped area at the height of PM1-PM2 in the anterior palate. In general, a posterior tipping was beneficial at anterior positions, and an anterior tipping appeared beneficial at posterior positions. High interindividual variation was found and should be carefully considered by the clinician.
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Affiliation(s)
- Kathrin Becker
- Department for Orthodontics, University Hospital Düsseldorf, Düsseldorf, Germany.
| | - Justine Unland
- Department for Orthodontics, University Hospital Düsseldorf, Düsseldorf, Germany
| | - Benedict Wilmes
- Department for Orthodontics, University Hospital Düsseldorf, Düsseldorf, Germany
| | | | - Dieter Drescher
- Department for Orthodontics, University Hospital Düsseldorf, Düsseldorf, Germany
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Poluha RL, Eidt JMS, Danieletto-Zanna CF, Ferreira GZ, Takizawa OK, Farah GJ. Use of osseointegrated implants in the intermaxillary suture in a patient with microstomia: Case report with a 2-year follow-up. SPECIAL CARE IN DENTISTRY 2019; 39:533-537. [PMID: 31322283 DOI: 10.1111/scd.12407] [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: 04/30/2019] [Revised: 07/02/2019] [Accepted: 07/05/2019] [Indexed: 11/27/2022]
Abstract
AIM To report the rehabilitation of a female patient, 40 years old, with a microstomia. CASE REPORT The Z-plasty surgery was performed in the region of the labial commissure to increase the mouth opening. In the mandible, two implants were installed in the interforaminal region and an overdenture with bar/clip attachment system was made. The maxilla was atrophic, with the presence of two bone sites in the intermaxillary suture region: the first one anterior to the incisive foramen and the second one in the middle of the hard palate. Two implants were placed without a graft in those sites. The conventional maxillary denture was converted into an overdenture with ball attachments system. CONCLUSION Based on the presented case, with a 2-year follow-up, it can be concluded the validity of the use of the techniques of surgeries to increase the mouth opening, implants in intermaxillary suture and overdentures as rehabilitation therapy for patients with microstomia.
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Tirado Núñez AP, Castrejón Jaime S, Silva Zatarain AN, Gutiérrez Rojo JF. Comparación del grosor óseo palatino bilateral para inserción de miniimplantes. ACTA ODONTOLÓGICA COLOMBIANA 2019. [DOI: 10.15446/aoc.v9n2.78843] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022] Open
Abstract
Objetivo: comparar el grosor óseo palatino bilateral e identificar zonas seguras para inserción de miniimplantes. Métodos: se llevó a cabo un estudio transversal que incluyó 100 tomografías de haz cónico (CBCT) pretratamiento de pacientes que asistieron a la Especialidad de Ortodoncia en la Universidad Autónoma de Nayarit (UAN). Las imágenes fueron orientadas utilizando el mismo protocolo. En el corte sagital, las mediciones se realizaron de los 0 a los 24mm, con intervalos de 3mm entre cada una, con la primera medición en el borde posterior del foramen incisivo. Las mediciones del grosor palatino se realizaron en el corte coronal a los 2, 4, 6 y 8mm de la sutura media palatina hacia ambos lados. Resultados: se encontró mayor grosor en la zona anterior en las medidas sagitales de 0 mm y 3 mm, a diferencia del resto del paladar. Se hallaron diferencias estadísticamente significativas al comparar los valores tanto sagitales como transversales. Con la prueba Post Hoc de Tukey no se encontraron diferencias estadísticamente significativas al comparar el lado derecho con el izquierdo en cada una de las medidas transversales. Conclusiones: no se encontraron diferencias significativas entre los dos lados, se determinó como zona segura la región anterior del paladar de 0mm a 6mm y es primordial la CBCT en todos los pacientes con indicación de miniimplantes en paladar.
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Chhatwani S, Rose-Zierau V, Haddad B, Almuzian M, Kirschneck C, Danesh G. Three-dimensional quantitative assessment of palatal bone height for insertion of orthodontic implants - a retrospective CBCT study. Head Face Med 2019; 15:9. [PMID: 30935392 PMCID: PMC6442434 DOI: 10.1186/s13005-019-0193-9] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/12/2018] [Accepted: 03/13/2019] [Indexed: 11/23/2022] Open
Abstract
Background Orthodontic implants have found widespread use as means of maximum skeletal anchorage in fixed orthodontic treatment, their optimal insertion location in the hard palate, however, is still controversial. The aim of this study was therefore to assess mean bone height across the hard palate and possible age- and sex related differences to identify the most favourable location according to maximum bone height, optimizing primary stability and survival of inserted orthodontic implants. Methods In this retrospective cross-sectional study, maxillary pretreatment CBCT scans of 180 healthy orthodontic patients (95♀, 85♂, age 8–40 years) were analysed with regard to vertical palatal bone height in the midpalatal area at 88 validated points distanced 2 mm from each other forming a grid of 0–14 mm posterior to the incisive foramen and 10 mm lateral of the midpalatal suture. Differences in bone height regarding sex and topographical location were assessed by three-way ANOVA. Results In general, the midpalatal suture as well as the anterior-lateral palatal region showed distinctly higher mean palatal bone height with its maximum 4 mm posterior of the incisive foramen, whereas bone height was limited at the posterior region of the midpalatal suture. Women generally had significantly decreased palatal bone height compared to men at all measurement points. Higher age was associated with a decrease of bone height in the anterior and posterior lateral palatal region and the median palatal raphe with significant age differences. Conclusions The midpalatal suture as well as the anterior lateral palate seem to be most suitable for the insertion of orthodontic implants. Palatal bone height, however, was found to be sex- and age-specific, thus sex- and age-related differences should be taken into account, particularly regarding implant length. The ideal insertion site in the palate with sufficient bone height for orthodontic implants is 0-8 mm (men) or 0-6 mm (women) posterior to the incisive foramen and 10 mm lateral to the midpalatal suture. Trial registraion This study has been registered and approved by the Ethics Committee of the University of Witten/Herdecke, Germany (12/2016). Electronic supplementary material The online version of this article (10.1186/s13005-019-0193-9) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- Sachin Chhatwani
- Department of Orthodontics, University of Witten/Herdecke, Dental Clinic, Alfred-Herrhausen Str. 45, 58455, Witten, Germany.
| | - Viola Rose-Zierau
- Viola Rose-Zierau, Private Practice, Nelkenstr. 2, 44289, Dortmund, Germany
| | - Bassel Haddad
- Department of Orthodontics, University of Witten/Herdecke, Dental Clinic, Alfred-Herrhausen Str. 45, 58455, Witten, Germany
| | - Mohammed Almuzian
- Glasgow Dental Academy, Edinburgh, UK, Department of Orthodontics, University of Sydney, Sydney, NSW, Australia
| | - Christian Kirschneck
- Department of Orthodontics, University Medical Centre of Regensburg, Franz-Josef-Strauss-Allee 11, 93053, Regensburg, Germany
| | - Gholamreza Danesh
- Department of Orthodontics, University of Witten/Herdecke, Dental Clinic, Alfred-Herrhausen Str. 45, 58455, Witten, Germany
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Ichinohe M, Motoyoshi M, Inaba M, Uchida Y, Kaneko M, Matsuike R, Shimizu N. Risk factors for failure of orthodontic mini-screws placed in the median palate. J Oral Sci 2019; 61:13-18. [DOI: 10.2334/josnusd.17-0377] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/01/2022]
Affiliation(s)
- Michiko Ichinohe
- Department of Orthodontics, Nihon University School of Dentistry
| | - Mitsuru Motoyoshi
- Department of Orthodontics, Nihon University School of Dentistry
- Division of Clinical Research, Dental Research Center, Nihon University School of Dentistry
| | - Mizuki Inaba
- Department of Orthodontics, Nihon University School of Dentistry
| | - Yasuki Uchida
- Department of Orthodontics, Nihon University School of Dentistry
| | - Mari Kaneko
- Department of Orthodontics, Nihon University School of Dentistry
| | - Reiko Matsuike
- Department of Orthodontics, Nihon University School of Dentistry
| | - Noriyoshi Shimizu
- Department of Orthodontics, Nihon University School of Dentistry
- Division of Clinical Research, Dental Research Center, Nihon University School of Dentistry
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Utility of CBCT for the measurement of palatal bone thickness. JOURNAL OF STOMATOLOGY, ORAL AND MAXILLOFACIAL SURGERY 2018; 119:196-198. [DOI: 10.1016/j.jormas.2018.02.009] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/19/2017] [Accepted: 02/14/2018] [Indexed: 11/24/2022]
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Hsu JT, Wu AYJ, Fuh LJ, Huang HL. Effects of implant length and 3D bone-to-implant contact on initial stabilities of dental implant: a microcomputed tomography study. BMC Oral Health 2017; 17:132. [PMID: 29157247 PMCID: PMC5697107 DOI: 10.1186/s12903-017-0422-1] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/19/2017] [Accepted: 11/12/2017] [Indexed: 12/03/2022] Open
Abstract
Background The influences of potential bone-to-implant contact (BIC) area (pBICA), BIC area (BICA), and three dimensional (3D) BIC percentage (3D BIC%; defined as BICA divided by pBICA) in relation to the implant length on initial implant stability were studied. Correlations between these parameters were also evaluated. Methods Implants with lengths of 8.5, 10, 11.5, and 13 mm were placed in artificial bone specimens to measure three indexes of the initial implant stability: insertion torque value (ITV), Periotest value (PTV), and implant stability quotient (ISQ). The implants and bone specimens were also scanned by microcomputed tomography, and the obtained images were imported into Mimics software to reconstruct the 3D models and calculate the parameters of 3D bone-to-implant contact including pBICA, BICA, and 3D BIC%. The Kruskal-Wallis test, Wilcoxon rank-sum test with Bonferroni adjustment, and Spearman correlations were applied for statistical and correlation analyses. Results The implant length affected ITV more than PTV and ISQ, and significantly affected pBICA, BICA, and 3D BIC%. A longer implant increased pBICA and BICA but decreased 3D BIC%. The Spearman coefficients were high (>0.78) for the correlations between the three 3D BIC parameters and the three indexes of the initial implant stability. Conclusions pBICA, BICA, and 3D BIC% are useful when deciding on treatment plans related to various implant lengths, since these 3D BIC parameters are predictive of the initial implant stability.
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Affiliation(s)
- Jui-Ting Hsu
- School of Dentistry, China Medical University, 91 Hsueh-Shih Road, Taichung, 40402, Taiwan.,Department of Bioinformatics and Medical Engineering, Asia University, 500 Lioufeng Rd, Wufeng, Taichung, 41354, Taiwan
| | - Aaron Yu-Jen Wu
- Department of Dentistry, Chang Gung Memorial Hospital & College of Medicine, Chang Gung University, 123 Ta-Pei Road, Niao-Sung, Kaohsiung, 83305, Taiwan
| | - Lih-Jyh Fuh
- School of Dentistry, China Medical University, 91 Hsueh-Shih Road, Taichung, 40402, Taiwan
| | - Heng-Li Huang
- School of Dentistry, China Medical University, 91 Hsueh-Shih Road, Taichung, 40402, Taiwan. .,Department of Bioinformatics and Medical Engineering, Asia University, 500 Lioufeng Rd, Wufeng, Taichung, 41354, Taiwan.
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Gupta A, Rathee S, Agarwal J, Pachar RB. Measurement of Crestal Cortical Bone Thickness at Implant Site: A Cone Beam Computed Tomography Study. J Contemp Dent Pract 2017; 18:785-789. [PMID: 28874642 DOI: 10.5005/jp-journals-10024-2127] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
AIM Dental implants have emerged as a new treatment modality for the majority of patients complaining of missing teeth. Bone quantity and bone quality are among various factors which ensure the longevity of dental implant in the patient's mouth. The assessment of cortical bone thickness of the outer layer and the cancellous bone density by cone beam computed tomography (CBCT) has proved beneficial for the patient. This study aimed at presurgical measurement of crestal bone thickness at various implant sites using CBCT images. MATERIALS AND METHODS This study was conducted in the Department of Prosthodontics in the year 2015. It included 218 patients who wanted to replace missing teeth. Patients were subjected to CBCT scan using NewTom CBCT machine operating at 120 kVp and 5 mA with a resolution of 0.1 × 0.1 × 0.1 mm3. New Net Technologies (NNT) software with a slice thickness of 0.1 mm was used in this study. A total of 780 implant sites were identified on images of 218 patients. In all patients, the measurement of crestal bone thickness in the region of implant site was performed with NNT software. The buccolingual measurement of crestal bone was done in cross sections obtained after CBCT Results: Out of 218 patients, males were 110 and females were 108. The difference between gender was nonsignificant (p > 0.05). Out of 780 implant sites, 370 were in the maxilla and 410 were in mandible. The difference was nonsignificant (p > 0.05). Out of 780 implant sites, 210 were in anterior maxilla and 160 were in the posterior maxilla. Totally, 235 sites were in anterior mandible and 175 were in the posterior mandible. The distribution was nonsignificant (p = 0.15). The mean crestal bone thickness in anterior maxilla was 0.82 mm, in posterior maxilla was 0.76 mm, in anterior mandible was 1.08 mm, and in posterior mandible was 1.18 mm. The difference among regions was significant (p = 0.01). CONCLUSION The highest thickness of cortical bone was observed in posterior mandible followed by anterior mandible, anterior maxilla, and posterior maxilla. Thus, considering the less cortical thickness in the posterior maxillary region, the implant placement should be done with proper attention. CLINICAL SIGNIFICANCE Dental implant is the need of the hour. It is beneficial to patients in terms of longer survival rates. With CBCT, all measurements, such as bone quality and quantity have become easy because of three-dimensional nature. This has proved to be beneficial in the analysis of cortical bone thickness as well as measuring the distance from anatomical structures.
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Affiliation(s)
- Ajai Gupta
- Department of Prosthodontics, Crown and Bridge, Inderprastha Dental College & Hospital, Ghaziabad, Uttar Pradesh, India, Phone: +919811514226, e-mail:
| | - Suprabha Rathee
- Department of Prosthodontics, Crown and Bridge, Inderprastha Dental College & Hospital, Ghaziabad, Uttar Pradesh, India
| | - Jaihans Agarwal
- Department of Conservative Dentistry and Endodontics, Shree Bankey Bihari Dental College and Research Centre, Ghaziabad Uttar Pradesh, India
| | - Renu B Pachar
- Department of Prosthodontics, Maharaja Ganga Singh Dental College & Research Centre, Sri Ganganagar, Rajasthan, India
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Ko YC, Huang HL, Shen YW, Cai JY, Fuh LJ, Hsu JT. Variations in crestal cortical bone thickness at dental implant sites in different regions of the jawbone. Clin Implant Dent Relat Res 2017; 19:440-446. [PMID: 28074591 DOI: 10.1111/cid.12468] [Citation(s) in RCA: 38] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/30/2016] [Revised: 10/20/2016] [Accepted: 11/19/2016] [Indexed: 01/06/2023]
Abstract
BACKGROUND Dental implants have become reliable and predictable tools for treating missing teeth. The survival rate of dental implants is markedly influenced by the host bone quality and quantity of the jawbone. A better host bone provides higher initial stability of the dental implant, resulting in better osseointegration and a higher success rate. Host bone quality and quantity are determined by the crestal cortical bone thickness and inner cancellous bone density. OBJECTIVE The purpose of this study was to determine the crestal cortical bone thickness at dental implant sites in different regions of the jawbone through the use of dental cone-beam computed tomographic (CBCT) images. MATERIALS AND METHODS A total of 661 dental implant sites (81 in the anterior mandible, 122 in the anterior maxilla, 224 in the posterior mandible, and 234 in the posterior maxilla) were obtained from the jawbones of 173 humans. The data were subjected to statistical analysis to determine any correlation between crestal cortical bone thicknesses and jawbone regions using one-way analysis of variance with Tukey's post-test. RESULTS The crestal cortical bone thicknesses at dental implant sites in the four regions decreased in the following order: posterior mandible (1.07 ± 0.47 mm, mean ± SD) >anterior mandible (0.99 ± 0.36 mm) >anterior maxilla (0.82 ± 0.30 mm) >posterior maxilla (0.75 ± 0.35 mm). CONCLUSION The dental CBCT data demonstrate that crestal cortical bone thickness varies markedly between dental implant sites in the four regions of the jawbone.
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Affiliation(s)
- Yi-Chun Ko
- School of Dentistry, College of Medicine, China Medical University, Taichung, 404, Taiwan
| | - Heng-Li Huang
- School of Dentistry, College of Medicine, China Medical University, Taichung, 404, Taiwan.,Department of Bioinformatics and Medical Engineering, Asia University, Taichung, 413, Taiwan
| | - Yen-Wen Shen
- School of Dentistry, College of Medicine, China Medical University, Taichung, 404, Taiwan.,Department of Dentistry, China Medical University and Hospital, Taichung, 404, Taiwan
| | - Jyun-Yi Cai
- School of Dentistry, College of Medicine, China Medical University, Taichung, 404, Taiwan.,Department of Dentistry, China Medical University and Hospital, Taichung, 404, Taiwan
| | - Lih-Jyh Fuh
- School of Dentistry, College of Medicine, China Medical University, Taichung, 404, Taiwan.,Department of Dentistry, China Medical University and Hospital, Taichung, 404, Taiwan
| | - Jui-Ting Hsu
- School of Dentistry, College of Medicine, China Medical University, Taichung, 404, Taiwan.,Department of Bioinformatics and Medical Engineering, Asia University, Taichung, 413, Taiwan
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