Radiographic Eevaluation of Gonial Angle Size and Its Correlation with Cortical Thickness and Height of Mandibular Residual Body
Document Type : مقالههای پژوهشی
Authors
1 Postgraduate Student of Periodontics, School of Dentistry, Islamic Azad University, Isfahan (Khorasgan) Branch, Isfahan, Iran
2 Postgraduate Student of Oral and Maxillofacial Radiology, Islamic Azad University, Isfahan (Khorasgan) Branch, Isfahan, Iran
3 Oral and Maxillofacial Radiologist, Sari, Iran
10.48305/v0i0.1676
Abstract
Introduction: Bone remodeling is a continuous and complex process and it seems that the morphologic changes in mandible is under the influence of age and dental status of the patient. The Gonial angle is a region of mandible that affects from these changes. The aim of this study is the evaluation of Gonial angle size and its correlation with cortical thickness and height of mandibular residual body in various dental status by means of panoramic radiography.
Materials and Methods: In this cross sectional study 252 panoramic radiographs of patients who went to Sari Dental School Clinic were examined. Dental status of patients was recorded in the form of relevant information and the patients were categorized in three different groups: Dentate, Partially Dentate and Edentulous group. Panoramic measurement was performed by using software DFW v2.8. All the data were analyzed by software SPSS v16 and descriptive statistics and methods of inferential statistics (p value < 0.001).
Results: The mean size of gonial angle in dentate, partially dentate and edentulous was 119.92 ± 3.79, 123.48 ± 3.43 and 127.14 ± 5.20 degrees. The mean height of cortical thickness in dentate, partially dentate and edentulous was 3.52 ± 0.73, 3.12 ± 0.54 and 2.86 ± 0.71 mm. The mean height of mandibular residual body in dentate, partially dentate and edentulous was 25.62 ± 2.50, 19.95 ± 3.07 and 14.75 ± 4.67 mm.
Conclusion: Gonial angle size has an inverse ratio with cortical thickness and height of residual mandibular body
Keywords: Cortical bone, Mandible, Radiograph
Materials and Methods: In this cross sectional study 252 panoramic radiographs of patients who went to Sari Dental School Clinic were examined. Dental status of patients was recorded in the form of relevant information and the patients were categorized in three different groups: Dentate, Partially Dentate and Edentulous group. Panoramic measurement was performed by using software DFW v2.8. All the data were analyzed by software SPSS v16 and descriptive statistics and methods of inferential statistics (p value < 0.001).
Results: The mean size of gonial angle in dentate, partially dentate and edentulous was 119.92 ± 3.79, 123.48 ± 3.43 and 127.14 ± 5.20 degrees. The mean height of cortical thickness in dentate, partially dentate and edentulous was 3.52 ± 0.73, 3.12 ± 0.54 and 2.86 ± 0.71 mm. The mean height of mandibular residual body in dentate, partially dentate and edentulous was 25.62 ± 2.50, 19.95 ± 3.07 and 14.75 ± 4.67 mm.
Conclusion: Gonial angle size has an inverse ratio with cortical thickness and height of residual mandibular body
Keywords: Cortical bone, Mandible, Radiograph
1-Jensen E, Palling M. The gonial angle: A survey. American Journal of Orthodontics 1954; 40(2): 120-33.
2-Weinmann JP, Sicher H. Bone and bones: Fundamentals of bone biology. St Louis: Mosby; 1947. p. 178-80.
3-Buikstra JE, Ubelaker DH. Standards for data collection from human skeletal remains: proceedings of a seminar at the field museum of natural history (Arkansas Archeological Survey Research Report). American Journal of Human Biology 1994; 7(5): 672.
4-Dutra V, Yang J, Devlin H, Susin C. Mandibular bone remodeling in adults: evaluation of the panoramic radiographs. Detomaxillfac Radiol 2004; 33(5): 323-8.
5-Huumonen S, Sipila K, Haikola B, Tapio M, Soderholm AL, Remes-lyly T, et al. M. Influences of edentulousness on gonial angle, ramus and condylar height. Journal of Oral Rehabilitation 2009; 37(1): 34-8.
6-Tallgren A. The continuing reduction of the residual alveolar ridges in complete denture wearers: a mixed-longitudinal study covering 25 years. J Prosthet Dent 1972: 27(2): 120-32.
7-Xie QF, Ainamo A. Correlation of gonial angle size with cortical thickness, height of the mandibular residual body, and duration of edentulism. J Prosthet Dent 2004; 91(5): 477-82.
8-Rogers WM, Applebaum E. Changes in the mandible following closure of the bite with particular reference to edentulous patients. J American Dental Assoc 1941; 28(10): 1573-86.
9-Yanikoglu N, Yilmaz B. Radiological evaluation of changes in the gonial angle after teeth extraction and wearing of dentures: a 3-year longitudinal study. Oral Surg Oral Med Oral Pathol Oral Radiol Endod 2008; 105(6): e55-60.
10-Hutchinson EF, Farella M, Kramer B. Importance of teeth in maintaining the morphology of the adult mandible in humans. Eur J Oral Sci 2015; 10(5); 22-30.
11-Raustia AM, Salonen MA. Gonial angle and condylar and ramus height of the mandible in complete denture wearers- a panoramic radiograph study. J Oral Rehabil 1997; 24(7): 512-6.
12-Upadhyay RB, Upadhyay J, Agrawal P, Rao NN. Analysis of gonial angle in relation to age, gender, and dentition status by radiological and anthropometric methods. J Forensic Dent Sci 2012; 4(1): 29-33.
13-Ceylan G, Yanikoglu N, Yilmaz AB, Ceylan Y. Changes in the mandibular angle in the dentulous and edentulous states. J Prosthet Dent 1998; 80(6): 680-4.
14-Xie Q, Wolf J, Tilvis R, Ainamo A. Resorption of mandibular canal wall in the edentulous aged population. J Prosthet Dent 1997; 77(6): 596-600.
15-von Wowern N, Stoltze K. Pattern of age related bone loss in mandibles. Scand J Dent Res 1980; 88(2): 134-46.
16-Yüzügüllü B, Gulsahi A, Imirzalioglu P. Radiomorphometric indices and their relation to alveolar bone loss in completely edentulous Turkish patients: a retrospective study. J Prosthet Dent 2009; 101(3): 160-5.
17-Karaagaçlioglu L, Ozkan P. Changes in mandibular ridge height in relation to aging and length of edentulism period. Int J Prosthodont 1994; 7(4): 368-71.
18-Osatoa S, Kuroyama I, Nakajima S, Ogawa T, Misakib K. Differences in 5 anatomic parameters of mandibular body morphology by gonial angle size in dentulous Japanese subjects. J Annals of Anatomy. 2012; 194(5): 446-51.
19-Yazdani J, Taheritaleshand K, Ghavimi M. Comparison of changes of the Gonial angle in 2 methods: IVRO and BSSO. Research Journal of Biological Sciences 2009; 4(2): 148-51.
20-Mattila K, Altonen M, Haavikko K. Determination of the gonial angle from the orthopantomgram. Angle Orthod 1977; 47(2): 107-10.
21-Updegrave WJ. The role of panoramic radiography in diagnosis. Oral Surg Oral Med Oral Pathol 1966; 22(1): 49-57.
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