Is Centric Relation and Centric Occlusion Discrepancy an Enigma? An Orthodontic Perspective (original) (raw)
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International journal of odontostomatology, 2017
The objective of this study was to verify the influence of the use of Class II intermaxillary elastics on centric relation (CR) to centric occlusion (CO) occlusal discrepancy. A total of 30 patients had been at the contention stage for at least three months were divided in two groups: G1-15 had been submitted to intramaxillary orthodontic mechanics only, and G2-15 had used Class II intermaxillary elastics. Distances of horizontal and vertical overlap and the distance or coincidence of the mandibular dental midline in relation to the maxillary midline were measured in CR and CO positions. Intergroup comparisons were performed using the Mann-Whitney test. No statistically significant differences (P>0.05) were found between G1 and G2. Both in the horizontal and vertical directions, these discrepancies were smaller than or equal to 1mm in 96.66 % of the patients. In the transverse plane, there was no discrepancy in 63.33 % of the patients, and in 33.33 % these discrepancies were equal to 0.5 mm. The use of Class II elastic didn't be capable of increasing the occlusal discrepancies between CR and CO.
Journal of Oral and Maxillofacial Surgery, 2009
The purpose of this study was to determine whether there is a consensus among oral and maxillofacial surgeons and orthodontists as to the definition of centric relation. Materials and Methods: A survey constructed from 5 definitions of centric relation as provided from the "Glossary of Prosthodontic Terms" was sent to the chairpersons of every oral and maxillofacial surgery and orthodontic program in the United States. Only full-time faculty members from each program were asked to respond to the survey. The different responses were analyzed statistically by 2 analysis and examined by use of 95% confidence intervals. Results: We received 73 responses from the oral and maxillofacial surgeons and 64 from the orthodontists. There were 69 different programs represented in this survey. Orthodontists and surgeons had a significantly different response regarding the definition of centric relation (2 ϭ 28, df ϭ 4, P Ͻ .0001). There was no difference between the 2 groups on the need for mounting models in centric relation for use in orthognathic surgery (2 ϭ 1, P Ͼ .6). Regarding the definition of centric occlusion, there was a significant difference between orthodontists and surgeons (2 ϭ 9.9, df ϭ 1, P ϭ .0070). The fourth and fifth questions had to do with centric relation/centric occlusion slide and the direction of movement. There was a significant difference between the 2 groups regarding mandibular movement (2 ϭ 28, df ϭ 2, P Ͻ .0001). Surgeons were nearly unanimous in their opinion that the mandible would move anteriorly (88%), whereas there was more discordance among orthodontists. Within the orthodontic group, 50% indicated anterior movement and 47% indicated that either an anterior or posterior movement could occur. The surgeons were asked 1 additional question that the orthodontists were not. Forty-nine percent of the surgeons indicated that during a bilateral sagittal split osteotomy, the proximal segment should be seated vertically and posteriorly before rigid fixation. Conclusions: The results of this study show that there is a statistical lack of consistency among practitioners regarding an absolute definition of centric relation as it relates to orthognathic surgery. The inconsistency exists between specialties and within practitioners in each specialty.
Journal of Clinical Medicine
Background: Available knowledge about malocclusion and cephalometric variables and their connection with an increased risk of condylar displacement (CD) is scarce. This article aims to present current information on the relationship between centric relation-maximum intercuspal position discrepancies and maxillofacial morphology and malocclusion in patients seeking orthodontic treatment as well as to identify those who require expanded diagnostic evaluation for this disorder. Methods: This review analyzed the PubMed, Cochrane Library, Web of Science, and Scopus electronic databases up to February 2022. Keywords and additional manual searches were performed. Literature selection was based the PRISMA-ScR checklist. The JBI Critical Appraisal Tool assessed the methodological quality of included studies. Results: The databases search provided 2321 studies. A total of 10 studies were included in this review after eligibility criteria and JBI assessment. This review was separated into five...
The Pattern of Occlusal Contact in Lateral Mandibular Jaw Position
Journal of Pharmaceutical Research International, 2022
Objective: To determine the pattern of occlusal contacts in lateral jaw position of the mandibles in different of molar classification. Study Design: Observational study. Setting: Study carried out at Department of Prosthodontics; Institute of Dentistry, LUMHS, Jamshoro, Pakistan from June 2020 to December 2020. Materials and Methods: Subjects having normal Angle’s class 1 occlusal alignment, both male and females aged between 20-30 years old and subjects having full dentition with the exception for third molars were included the study. While Subjects with severe attrition problems, Subjects were placed in a dental chair with the Frankfurt level parallel to the floor. The interocclusal contacts were recorded with 12μ thick shim stock in four lateral positions on both sides; 0.5, 1, 2, and 3 mm measured with Vernier caliper from the maximum intercuspation point. The shim stock was placed on the occlusal surface on the right side, and the subject was asked to close his/her mandible...
Meta-Analysis of Various Methods of Recording Centric Jaw Relation-A Literature Review
https://www.ijhsr.org/IJHSR\_Vol.7\_Issue.3\_March2017/IJHSR\_Abstract.047.html, 2017
Centric relation is the most difficult, yet, most important step in fabrication of a successful prosthesis. It is a complex relationship which exists in 3 dimensions and variations may occur in any direction-vertical, anteroposterior or mediolateral. Thus, it is essential to record this relationship with the least possible error to obtain a successful prosthesis. However when relating the maxillary and mandibular dental casts, the ultimate accuracy depends on the technique used to record the maxillomandibular relationship and accuracy and dimensional stability of the material
American Journal of Orthodontics and Dentofacial Orthopedics, 1987
This article investigates the influence of occlusion on condylar position as seen on TMJ nomograms in a group of 44 young adults with no histories of orthodontic or occiusal therapy and no ~bje~~iv~ signs of masticatory dysfunction; the sample was screened from a population of 253 students. Nonconcentric condylar position at ICP was a feature of Class II malocclusion with significantly more anterior positions in Class II, Division 1 than in Class I. Condylar position was unrelated to the amount of sagittal RCP-ICP slide, although most slides were ~0.5 mm. The frequency of lateral slides was low, but was mildly related to bilaterally asymmetric condylar positions. Position was unrelated to the degree of overbite, which ranged from 0 to 10 mm. Bilateral condylar ~~sit~o~ asymmetry was not related to the direction of dental midline discrepancy, which range to No open bites or mandibular overjets were seen in this asymptomatic normal sample. (AM 4 b DENTOFAC ORTHOP 1987;91:200-6.
Pattern of occlusal contacts in eccentric position of mandible in dental students
Journal of Nepalese Prosthodontic Society
Introduction: Canine protection and group function are the two stand out occlusal schemes observed during laterotrusive movement of the mandible. The study aims to evaluate the frequency of these occlusal schemes in Nepalese dental students. Materials and methods: A cross-sectional study was conducted among dental students in People’s Dental College and Hospital, Kathmandu, Nepal after the ethical approval from PDCH-IRC. Sixty four undergraduate students aged 21-30 years, were examined for the occlusal contact patterns in lateral mandibular movements using 12μm shim stock. The data were analyzed using SPSS software (version 21) Result: On 1mm laterotrusive position on mandible, 43 subjects (67%) showed group function, 15 subjects (24%) canine guided and 6 subjects (9%) non specified occlusion. On 3mm laterotrusive movement, 31(48%) subjects showed group function and 27 subjects (42%) showed canine guided occlusal scheme. The most frequent mediotrusive contact was the second molar fo...
Relationship between craniocervical orientation and center of force of occlusion in adults
CRANIO®, 2016
Objective: Clinical observation and anecdotal reports suggest changes can occur to dental occlusion following intervention with the National Upper Cervical Chiropractic Association (NUCCA) procedure. This case controlled study discerned if occlusion changes are measurable using a dental force plate (T-Scan®) following an adjustment to the craniocervical junction (CCJ). Methods: A degree of case control was established by active patients being assessed twice prior to and following intervention. Before-after intervention assessment included posture evaluation and dental occlusion (T-Scan®). Results: Findings suggest that changes in posture and occlusion can be observed after the NUCCA chiropractic procedure. Not all patients demonstrated a more balanced contact pattern following the adjustment, indicating a need for further investigation. Discussion: These findings may suggest interconnectivity between the CCJ and an individual's occlusal contacts and support the need for further integration between chiropractors and dentists seeking to co-manage temporomandibular joint disorders.