1
|
Sanders-Mello F, Jonkman RE, Atay J, Atay J, Rozema FR, Koolstra JH. Symmetry of the external acoustic meatus: A potential alternative reference plane for three-dimensional imaging in dentistry. Heliyon 2024; 10:e30460. [PMID: 38756604 PMCID: PMC11096971 DOI: 10.1016/j.heliyon.2024.e30460] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/10/2023] [Revised: 04/26/2024] [Accepted: 04/26/2024] [Indexed: 05/18/2024] Open
Abstract
Objective In this study, we thoroughly analyzed how balanced the left and right sides of the external acoustic meatus are. Despite previous research focusing on the consistency of various anatomical features and the shape of the external acoustic meatus, which are important for creating guidelines to assess changes in the skull, there hasn't been enough attention given to how symmetrical it is. Our aim was to fill this gap by providing a comprehensive examination of its bilateral symmetry, which is crucial for accurate evaluations in dentistry and medicine. Study design After importing 26 cone-beam computed tomography scans of patients into the ITK-SNAP 3D imaging software, a midsagittal plane was set up as the plane of symmetry for each patient. With this plane, we compared the positions of the most superior and inferior left and right points of the external acoustic meatus. We also compared the lengths and depths of the lines connecting the two points. Results There were no statistically significant differences in the position, length, or depth of the external acoustic meatus between the right and left halves of the skull. Conclusion Specific points on the skull, such as the highest (most superior MSP) and lowest (most inferior MIP) points, demonstrated a high degree of symmetry in the left and right halves. They demonstrated sufficient symmetry to establish a reliable reference plane. Along with the trajectory connecting them, these points can serve as viable alternatives to the Porion for three-dimensional imaging.
Collapse
Affiliation(s)
| | | | - Josef Atay
- Academic Center for Dentistry Amsterdam (ACTA), the Netherlands
| | - Jasmine Atay
- Academic Center for Dentistry Amsterdam (ACTA), the Netherlands
| | - Frederik R. Rozema
- Academic Center for Dentistry Amsterdam (ACTA), The Netherlands Department of Oral Medicine, University of Amsterdam, the Netherlands
- Department of Oral and Maxillofacial Surgery, Amsterdam UMC, University of Amsterdam, the Netherlands
| | | |
Collapse
|
2
|
Shukla AK, Chaturvedi S, Ahmed AR, Abouzeid HL, Suleman G, Sharif RA, Gurumurthy V, Cicciù M, Minervini G. Analysis of modified palatal surface for better speech in edentulous patients: A clinico-analytical study. Technol Health Care 2024; 32:1055-1065. [PMID: 37483039 DOI: 10.3233/thc-230477] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 07/25/2023]
Abstract
BACKGROUND Phonetics with mechanics and aesthetics are considered cardinal factors contributing to the success of complete dentures. OBJECTIVE The aim of the current study was to evaluate the changes in speech in complete denture patients with and without palatal surface changes. METHODS The data collected for the study involved completely edentulous Patients (n= 80). Patients were divided into two groups. Group A: Up to 50 years (n= 40); Group B: Above 50 years (n= 40) (including male and female). Each group was further divided into four subgroups for speech analysis-without dentures (A1/B1); with conventional dentures (A2/B2); dentures with a palatogram (A3/B3) and dentures with palate sandblasted (A4/B4). The speech sounds of all patients were evaluated for pitch and intensity using a spectrophotogram (Praat software) and Likert scale. The data so obtained from the quantitative and qualitative analysis were statistically analysed through one-way ANOVA, unpaired student's t-test, and Pearson correlation coefficient. Qualitative analysis was done with the Mann-Whitney U test. RESULTS The maximum mean value of the pitch and intensity in Groups A and B was subgroup A3 (Palatogram) 190.37 ± 21.50 and 77.07 ± 7.58, B3 (Palatogram) 190.87 ± 24.36 and 75.33 ± 8.12. When comparing Groups A [A1, A2, A3, A4] and B [B1, B2, B3, B4] on the basis of pitch and intensity, a statistically insignificant value was found. No changes in speech sounds (pitch and intensity) were observed in terms of age. Both quantitative and qualitative analysis results showed that speech sounds in the patients with palatogram, had the highest pitch and intensity and were most clear to the listener and there were statistically significant differences from other groups. CONCLUSION Speech was better in palatogram-based dentures in comparison to a sandblasted denture, conventional denture and without denture in terms of qualitative and quantitative analysis. The physiologic nature of the palatogram fabrication technique produces the palatal part of the denture more compatible with the tongue, thus producing better speech.
Collapse
Affiliation(s)
- Anuj K Shukla
- Department of Dentistry, Government Medical College, and Hospital Ratlam, Madhya Pradesh, India
| | - Saurabh Chaturvedi
- Department of Prosthetic Dentistry, College of Dentistry King Khalid University, Abha, Saudi Arabia
| | - Abdul Razzaq Ahmed
- Department of Prosthetic Dentistry, College of Dentistry King Khalid University, Abha, Saudi Arabia
| | - Hoda Lofty Abouzeid
- Department of Prosthetic Dentistry, College of Dentistry King Khalid University, Abha, Saudi Arabia
| | - Ghazala Suleman
- Department of Prosthetic Dentistry, College of Dentistry King Khalid University, Abha, Saudi Arabia
| | - Rania A Sharif
- Department of Prosthetic Dentistry, College of Dentistry King Khalid University, Abha, Saudi Arabia
| | - Vishwanath Gurumurthy
- Department of Dental Technology, College of Applied Medical Sciences, King Khalid University, Abha, Saudi Arabia
| | - Marco Cicciù
- Department of Biomedical and Surgical and Biomedical Sciences, Catania University, Catania, Italy
| | - Giuseppe Minervini
- Multidisciplinary Department of Medical-Surgical and Odontostomatological Specialties, University of Campania "Luigi Vanvitelli", Naples, Italy
- Saveetha Dental College and Hospitals, Saveetha Institute of Medical and Technical Sciences (SIMATS), Saveetha University, Chennai, India
| |
Collapse
|
3
|
Kim DS, Park SH, Ahn JJ, Jeong CM, Yun MJ, Huh JB, Lee SH. In vitro comparison of the accuracy of an occlusal plane transfer method between facebow and POP bow systems in asymmetric ear position. J Adv Prosthodont 2023; 15:271-280. [PMID: 37936837 PMCID: PMC10625888 DOI: 10.4047/jap.2023.15.5.271] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/25/2023] [Revised: 09/25/2023] [Accepted: 10/06/2023] [Indexed: 11/09/2023] Open
Abstract
PURPOSE This in vitro study aimed to compare the accuracy of the conventional facebow system and the newly developed POP (PNUD (Pusan National University Dental School) Occlusal Plane) bow system for occlusal plane transfer in asymmetric ear position. MATERIALS AND METHODS Two dentists participated in this study, one was categorized as Experimenter 1 and the other as Experimenter 2 based on their clinical experience with the facebow (1F, 2F) and POP bow (1P, 2P) systems. The vertical height difference between the two ears of the phantom model was set to 3 mm. Experimenter 1 and Experimenter 2 performed the facebow and POP bow systems on the phantom model 10 times each, and the transfer accuracy was analyzed. The accuracy was evaluated by measuring the angle between the reference virtual plane (RVP) of the phantom model and the experimental virtual plane (EVP) of the upper mounting plate through digital superimposition. All data were statistically analyzed using a paired t-test (P < .05). RESULTS Regardless of clinical experience, the POP bow system (0.53° ± 0.30 (1P) and 0.19° ± 0.18 (2P) for Experimenter 1 and 2, respectively) was significantly more accurate than the facebow system (1.88° ± 0.50 (1F) and 1.34° ± 0.25 (2F), respectively) in the frontal view (P < .05). In the sagittal view, no significant differences were found between the POP bow system (0.92° ± 0.50 (1P) and 0.73° ± 0.42 (2P) for Experimenter 1 and 2, respectively) and the facebow system (0.82° ± 0.49 (1F) and 0.60° ± 0.39 (2F), respectively), regardless of clinical experience (P > .05). CONCLUSION In cases of asymmetric ear position, the POP bow system may transfer occlusal plane information more accurately than the facebow system in the frontal view, regardless of clinical experience.
Collapse
Affiliation(s)
- Dae-Sung Kim
- Department of Prosthodontics, Dental Research Institute, Pusan National University Dental Hospital, Yangsan, Republic of Korea
| | - So-Hyung Park
- Department of Prosthodontics, Dental and Life Sciences Institute, Education and Research Team for Life Science on Dentistry, School of Dentistry, Pusan National University, Yangsan, Republic of Korea
| | - Jong-Ju Ahn
- Department of Prosthodontics, Dental and Life Sciences Institute, Education and Research Team for Life Science on Dentistry, School of Dentistry, Pusan National University, Yangsan, Republic of Korea
| | - Chang-Mo Jeong
- Department of Prosthodontics, Dental Research Institute, Pusan National University Dental Hospital, Yangsan, Republic of Korea
- Department of Prosthodontics, Dental and Life Sciences Institute, Education and Research Team for Life Science on Dentistry, School of Dentistry, Pusan National University, Yangsan, Republic of Korea
| | - Mi-Jung Yun
- Department of Prosthodontics, Dental Research Institute, Pusan National University Dental Hospital, Yangsan, Republic of Korea
- Department of Prosthodontics, Dental and Life Sciences Institute, Education and Research Team for Life Science on Dentistry, School of Dentistry, Pusan National University, Yangsan, Republic of Korea
| | - Jung-Bo Huh
- Department of Prosthodontics, Dental Research Institute, Pusan National University Dental Hospital, Yangsan, Republic of Korea
- Department of Prosthodontics, Dental and Life Sciences Institute, Education and Research Team for Life Science on Dentistry, School of Dentistry, Pusan National University, Yangsan, Republic of Korea
| | - So-Hyoun Lee
- Department of Prosthodontics, Dental Research Institute, Pusan National University Dental Hospital, Yangsan, Republic of Korea
- Department of Prosthodontics, Dental and Life Sciences Institute, Education and Research Team for Life Science on Dentistry, School of Dentistry, Pusan National University, Yangsan, Republic of Korea
| |
Collapse
|
4
|
Sharab L, Jensen D, Hawk G, Kutkut A. A Cephalometric Analysis Assessing the Validity of Camper’s Plane to Establishing the Occlusal Plane in Edentulous Patients. Dent J (Basel) 2023; 11:dj11030081. [PMID: 36975578 PMCID: PMC10047553 DOI: 10.3390/dj11030081] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/09/2023] [Revised: 03/01/2023] [Accepted: 03/07/2023] [Indexed: 03/17/2023] Open
Abstract
Complete denture fabrication requires multiple clinical and laboratory steps. One of the most critical clinical steps is establishing an anatomical occlusal plane based on hard and soft tissue references. The aim of this study was to determine whether age or gender affects the level of the Ala-Tragus plane to establish which reference point on the Tragus should be used when fabricating the occlusal plane in edentulous patients. Clinical photographs and lateral cephalometric radiographs with complete dentitions were taken from 58 volunteers at the DMD clinic at the University of Kentucky. Each photograph was superimposed over its corresponding cephalometric image. An analysis was conducted to establish the angle of the occlusal plane relative to the Ala-Tragus landmarks; this data was then grouped according to age and gender. The analysis shows that age and gender did not significantly affect where the Camper’s plane should be approximated for complete denture treatment. However, it was found that the most parallel line to the occlusal plane was Ala’s inferior border to the ‘Tragus’s inferior border. It should be noted that the volunteers’ skeletal classification was significantly related to a Cl III malocclusion tendency. Still, with this new information, functionality and esthetics can be more adequately addressed for patients undergoing complete denture treatment. Given our results, we suggest redefining the ‘Camper’s plane with a line extending from ‘Ala’s inferior border to the ‘Tragus’s inferior border instead of the superior border. Further consideration should be taken if the patient is a skeletal CL III malocclusion.
Collapse
Affiliation(s)
- Lina Sharab
- Division of Orthodontics, College of Dentistry, University of Kentucky, Lexington, KY 40536, USA
| | - David Jensen
- Division of Orthodontics, College of Dentistry, University of Kentucky, Lexington, KY 40536, USA
| | - Gregory Hawk
- Department of Statistics, University of Kentucky, Lexington, KY 40536, USA
| | - Ahmad Kutkut
- Division of Prosthodontics, College of Dentistry, University of Kentucky, Lexington, KY 40536, USA
- Correspondence: ; Tel.: +1-(859)-323-4104; Fax: +1-(859)-257-8878
| |
Collapse
|
5
|
Ghodsi S, Sef Omrani S, Mogharrabi S, Valizadeh S. Evaluating the relation of posterior occlusal plane to ala-tragal line according to age and sex. Folia Med (Plovdiv) 2022; 64:787-792. [PMID: 36876530 DOI: 10.3897/folmed.64.e68631] [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: 05/13/2021] [Accepted: 11/23/2021] [Indexed: 11/07/2022] Open
Abstract
INTRODUCTION Occlusal plane orientation affects the esthetic, function, and success of removable or fixed prostheses. The most prevalent index for determination of this plane is the ala-tragus line while there are controversies in the exact location of tragus reference point.
Collapse
Affiliation(s)
| | | | - Sara Mogharrabi
- Ahvaz Jundishapur University of Medical Sciences, Ahvaz, Iran
| | | |
Collapse
|
6
|
A Study for Determining the Inclination of the Occlusal Plane from the Mandibular Functional Trajectory. Int J Dent 2022; 2022:6713881. [PMID: 35815116 PMCID: PMC9270148 DOI: 10.1155/2022/6713881] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/01/2021] [Accepted: 06/08/2022] [Indexed: 11/29/2022] Open
Abstract
Background During the fabrication of prostheses, the putative occlusal plane is generally determined based on morphological criteria such as Camper's plane. There is a possibility that morphological indexes deviate from their original positions over time. The current study investigated whether functional indexes could be used to determine occlusal planes instead of morphological indexes. Objectives The objectives of the present study were to investigate the relationship between the maxillary occlusal plane and mandibular functional trajectory and to consider a method for reconstructing a lost occlusal plane based on functional trajectories. Methods Thirteen healthy dentulous individuals were recruited for the study. Using a jaw motion tracking device with 6-degrees of freedom, the trajectories of the mandibular first molar and incisor during masticatory movement or tapping movements were measured. Results The closing angle of the mandibular first molar to the maxillary occlusal plane was converged and averaged 74.1° just below the intercuspal position, which is the terminal position of masticatory movement. This angle was positively correlated with the closing angle of the incisal point during tapping movement. The regression equation obtained was y = 0.37x + 45.99, where x was the closing angle of tapping movement and y was the closing angle of masticatory movement. Conclusions It was suggested that when determining lost occlusal plane, the occlusal plane can be derived using the closing angle of the incisal point during tapping movement.
Collapse
|
7
|
Conformity between Pacifier Design and Palate Shape in Preterm and Term Infants Considering Age-Specific Palate Size, Facial Profile and Lip Thickness. CHILDREN (BASEL, SWITZERLAND) 2022; 9:children9060773. [PMID: 35740710 PMCID: PMC9221625 DOI: 10.3390/children9060773] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/22/2022] [Revised: 05/14/2022] [Accepted: 05/17/2022] [Indexed: 11/17/2022]
Abstract
This retrospective case-control study is the first to examine the spatial conformity between pacifiers and palates in 39 preterm infants (12 females, 27 males) and 34 term infants (19 females, 15 males), taking into account the facial-soft-tissue profile and thickness. The shape of 74 available pacifiers was spatially matched to the palate, and conformity was examined using width, height, and length measurements. In summary, the size concept of pacifiers is highly variable and does not follow a growth pattern, like infant palates do. Pacifiers are too undersized in width, length, and height to physiologically fit the palate structures from 0 to 14 months of age. There are two exceptions, but only for premature palates: the palatal depth index at 9−11 months of age, which has no clinical meaning, and the nipple length at <37 weeks of age, which bears a resemblance to the maternal nipple during non-nutritive sucking. It can be concluded that the age-size concept of the studied pacifiers does not correspond to any natural growth pattern. Physiologically aligned, pacifiers do not achieve the age-specific dimensions of the palate. The effects attributed to the products on oral health in term infants cannot be supposed.
Collapse
|
8
|
Aesthetic Preference in the Transverse Orientation of the Occlusal Plane in Rehabilitation: Perspective of Laypeople and Dentists. INTERNATIONAL JOURNAL OF ENVIRONMENTAL RESEARCH AND PUBLIC HEALTH 2021; 18:ijerph182212258. [PMID: 34832013 PMCID: PMC8623891 DOI: 10.3390/ijerph182212258] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/11/2021] [Revised: 11/10/2021] [Accepted: 11/20/2021] [Indexed: 11/21/2022]
Abstract
The present study had a convenience sample with 236 laypeople and 242 dentists who completed an online questionnaire to choose the most attractive image among six pairs for comparison. Control image: symmetric (parallelism between occlusal plane (OP), commissural line (CL), and interpupillary line (IL)). Change of Control, obtaining three images with a 3-degree inclination of the labial commissures. Image A: OP parallel to IL; Image B: OP parallel to CL; Image C: OP at 1.5 degree mean angulation between IL and CL. Non-parametric comparison (IBM© SPSS Statistics vs. 27.0, p < 0.05). The “Dentists” group’s decreasing order of preference (attractiveness) of the images is: Control > A > C > B (p < 0.05). In the “Lay” group, it is: Control > A > (C not ≠ B). Dentists significantly prefer more the Control and Image A than laypeople (p < 0.001). Sex (single exception in laypeople), age, and dentist’s area of activity did not interfere in the perception of attractiveness. Dentists and laypeople preferred the Control when compared to images with CL canted. In the existence of CL inclination, the preference of the groups was the IL as a reference for OP orientation, with the mean angulation or coincident with the CL being considered less aesthetic.
Collapse
|
9
|
Li Y, Zhou W, Wu Y, Dai H, Zhou J. The relation between incisal guidance angle and the growth and development of temporomandibular joint: a multi-cross-sectional retrospective study. BMC Oral Health 2021; 21:380. [PMID: 34320973 PMCID: PMC8317419 DOI: 10.1186/s12903-021-01716-8] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/08/2021] [Accepted: 07/07/2021] [Indexed: 05/31/2023] Open
Abstract
Background The incisal guidance angle (IGA) is related to temporomandibular joint (TMJ), and changes to the IGA are often involved in the prosthetic and orthodontic treatment of anterior teeth. However, the influence of incisal guidance on the growth, development and remodelling of the TMJ is not yet clear. The aim of this study was to investigate age-related morphological differences in the TMJ in subjects with different IGAs. Methods Cone-beam computed tomography (CBCT) images of 274 patients were included (group 1, IGA < 45°; group 2, 45° ≤ IGA ≤ 60°; group 3, IGA > 60°). Each group was then divided into 4 age groups (group a, 6–12 years; group b, 13–16 years; group c, 17–25 years; group d, 26–33 years). TMJ morphology was assessed by linear measurements, angular measurements, and subjective evaluations. The IGA and occlusal plane angle were also measured. Results Anterior inclination of condyle (AIC) increased with age in the three IGA groups but decreased from 17 years onward in group 2 (P < 0.05). In the age groups analysis, the AIC in group 1 was smaller than that in group 3 but larger than that in group 2 (P > 0.05). Articular eminence inclination (AEI) decreased with age in group 1 (P = 0.027) but increased with age in group 3 (P = 0.053). The AEI in group 2 was larger than that in group 1 at 17–25 years (P = 0.046), and it was larger in group 3 than in group 1 at 26–33 years (P = 0.047). The IGA had a weak correlation with AEI (P < 0.05). Conclusion The articular fossa of patients with shallower incisal guidance changed to a flatter shape with age, whereas the condylar anterior slope and articular eminence of patients with steeper incisal guidance changed towards a steeper alignment. There was a correlation between IGA and TMJ shape.
Collapse
Affiliation(s)
- Ying Li
- Stomatological Hospital of Chongqing Medical University, No. 426 Songshi North Road, Chongqing, China.,Chongqing Key Laboratory of Oral Diseases and Biomedical Sciences, Chongqing, China
| | - Wenwen Zhou
- Stomatological Hospital of Chongqing Medical University, No. 426 Songshi North Road, Chongqing, China
| | - Yan Wu
- Stomatological Hospital of Chongqing Medical University, No. 426 Songshi North Road, Chongqing, China
| | - Hongwei Dai
- Stomatological Hospital of Chongqing Medical University, No. 426 Songshi North Road, Chongqing, China.,Chongqing Key Laboratory of Oral Diseases and Biomedical Sciences, Chongqing, China.,Chongqing Municipal Key Laboratory of Oral Biomedical Engineering of Higher Education, Chongqing, China
| | - Jianping Zhou
- Stomatological Hospital of Chongqing Medical University, No. 426 Songshi North Road, Chongqing, China. .,Chongqing Key Laboratory of Oral Diseases and Biomedical Sciences, Chongqing, China. .,Chongqing Municipal Key Laboratory of Oral Biomedical Engineering of Higher Education, Chongqing, China.
| |
Collapse
|
10
|
A Novel Approach to Determine the Prevalence of Type of Soft Palate Using Digital Intraoral Impression. Int J Dent 2017; 2017:3268064. [PMID: 28951740 PMCID: PMC5603334 DOI: 10.1155/2017/3268064] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2016] [Revised: 04/25/2017] [Accepted: 07/06/2017] [Indexed: 11/17/2022] Open
Abstract
Aim To determine the prevalence of type of soft palate in targeted population. Materials and Methods Using computer technology in dentistry, intraoral digital scanner, and 3D analysis software tool, study was conducted. 100 patients selected from the outpatient clinics were divided into two groups based on the ages of 20–40 years and 41–60 years with equal ratio of males and females. Each selected patient's maxillary arch was scanned with intraoral scanner; images so obtained were sectioned in anteroposterior cross section and with the 3D analysis software; the angulation between hard and soft palate was determined. Results The prevalence of type II soft palate (angulation between hard and soft palate is between 10 and 45 degrees) was highest, 60% in group 1 and 44% in group 2. The difference between genders was statistically significant with p value <0.05 in both the groups, although females had higher angulation compared to the males in all classes of both groups. Conclusions In targeted population of Aseer Province, Saudi Arabia, the prevalence of type II soft palate was more common, with higher soft palate angulation among females. The advanced age had no effect in the type of soft palate in the region.
Collapse
|
11
|
Nayar S, Bhuminathan S, Bhat WM, Mahadevan R. Relationship between occlusal plane and ala-tragus line in dentate individuals: A Clinical pilot study. J Pharm Bioallied Sci 2015; 7:S95-7. [PMID: 26015765 PMCID: PMC4439725 DOI: 10.4103/0975-7406.155822] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/31/2014] [Revised: 10/31/2014] [Accepted: 11/09/2014] [Indexed: 11/06/2022] Open
Abstract
Many methods have been used to establish the occlusal plane in complete denture prosthodontics. However, no single method seems to be fully accepted. Anteriorly, esthetic considerations help define the occlusal plane, and posteriorly the tongue, retromolar pad, and Stenson's duct are considered. Some dentists bisect the space between the residual ridges. The technique of using the ala-tragus line (Camper's line) to establish the occlusal plane is well documented. However, definitions of the ala-tragus line cause confusion, because the exact points of reference do not agree. For example, the glossary of prosthodontic terms states that the ala-tragus line runs from the inferior border of the ala of the nose to the superior border of the tragus of the ear while Spratley’ describes it as running from the center of the ala to the center of the tragus. This article concerns us the exact relationship between the occlusal plane and ala-tragus line in dentate individuals.
Collapse
Affiliation(s)
- Sanjna Nayar
- Department of Prosthodontics, Sree Balaji Dental College and Hospital, Bharath University, Chennai, Tamil Nadu, India
| | - S Bhuminathan
- Department of Prosthodontics, Sree Balaji Dental College and Hospital, Bharath University, Chennai, Tamil Nadu, India
| | - Wasim Manzoor Bhat
- Department of Prosthodontics, Sree Balaji Dental College and Hospital, Bharath University, Chennai, Tamil Nadu, India
| | - R Mahadevan
- Department of Prosthodontics, Sree Balaji Dental College and Hospital, Bharath University, Chennai, Tamil Nadu, India
| |
Collapse
|
12
|
Shetty S, Zargar NM, Shenoy K, D'Souza N. Position of Occlusal Plane in Dentate Patients with Reference to the Ala-Tragal Line Using a Custom-Made Occlusal Plane Analyzer. J Prosthodont 2015; 24:469-74. [PMID: 25556977 DOI: 10.1111/jopr.12250] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 06/03/2014] [Indexed: 11/27/2022] Open
Abstract
PURPOSE The purpose of this study was to determine which of the three positions on the tragus, (superior, middle, inferior) when joined with the ala of the nose for the ala-tragal line was most parallel to the natural occlusal plane in dentate patients. MATERIAL AND METHODS This study was carried out on 500 individuals, selected randomly and who agreed to participate in the study. A custom-made occlusal plane analyzer was used to check the parallelism between the ala-tragal line and the occlusal plane. The tragus was divided into three parts: superior, middle, and inferior. The instrument was placed in the participant's mouth, and the posterior points on the tragus were determined. RESULTS For the 500 dentate participants in this study, the most common location of the posterior point on the tragus was the inferior part of the tragus (50.8%). The second most common location of the tragus was the middle part (24.7%), followed by the superior location (12.1%). CONCLUSION The results of this study indicated that the occlusal plane was found parallel to a line joining the ala of the nose and the inferior part of the tragus in a slight majority of the participants.
Collapse
Affiliation(s)
- Sanath Shetty
- Department of Prosthodontics, Yenepoya Dental College, Mangalore, India
| | | | | | - Neevan D'Souza
- Department of Community Medicine, Yenepoya Dental College, Mangalore, India
| |
Collapse
|
13
|
Shetty S, Zargar NM, Shenoy K, Rekha V. Occlusal plane location in edentulous patients: a review. J Indian Prosthodont Soc 2013; 13:142-8. [PMID: 24431727 PMCID: PMC3732734 DOI: 10.1007/s13191-013-0288-0] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/06/2013] [Accepted: 04/17/2013] [Indexed: 11/29/2022] Open
Abstract
Occlusal plane orientation is an important factor in the construction of a complete denture. Occlusal plane could be oriented using landmarks in the mandibular arch as well as in the maxillary arch. In the mandibular arch there are few landmarks which could be used to orient the occlusal plane like the retromolar pad, corner of the lips (lower lip length) whereas the maxillary arch has a number of landmarks, of which the ala-tragal line is the most commonly used and the same being the most controversial. In the following article different landmarks and its accuracy for orientating the occlusal plane in an edentulous subject as studied by various authors has been discussed.
Collapse
Affiliation(s)
- Sanath Shetty
- />Department of Prosthodontics, Yenepoya Dental College, Mangalore, India
| | | | - Kamalakanth Shenoy
- />Department of Prosthodontics, Yenepoya Dental College, Mangalore, India
| | - V. Rekha
- />Department of Prosthodontics, Yenepoya Dental College, Mangalore, India
| |
Collapse
|