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Cranio : the Journal of... Nov 2021
Topics: Centric Relation; Dental Occlusion, Centric; Humans
PubMed: 34643155
DOI: 10.1080/08869634.2021.1980685 -
International Journal of Paediatric... Nov 2022Placing preformed metal crowns (PMCs) on all eight primary molars at one single clinical visit may disrupt a child's occlusion; the literature regarding the effects on...
BACKGROUND
Placing preformed metal crowns (PMCs) on all eight primary molars at one single clinical visit may disrupt a child's occlusion; the literature regarding the effects on occlusion and temporomandibular joint (TMJ) is scarce.
AIM
This study aimed to quantify the changes in occlusion using T-Scan III and to investigate whether there was TMJ dysfunction after placing eight PMCs at the same time.
DESIGN
In this study, we enrolled children with severe early childhood caries (S-ECC) and dental phobia, who needed eight PMCs to be placed under general anesthesia. The participants underwent occlusal examinations with a computed occlusal analysis system. The vertical dimension of occlusion (VDO) was measured using a dental vertical dimension gauge, TMJ dysfunction signs were recorded by the clinical dysfunction index (Di), and TMJ dysfunction symptoms were recorded using a questionnaire. The data were collected before treatment (T ), 1 week after treatment (T ), and 1 month (T ) and 3 months (T ) after treatment during follow-up visits. Repeated-measures analysis of variance and Friedman's test were used for occlusal data analysis. In addition, the Di and symptoms were compared over time using McNemar's test.
RESULTS
Forty patients (mean age = 4.25 ± 0.63 years, age range = 3-5 years, 21 boys and 19 girls) were followed up for 3 months. The occlusal contact area 3 months after treatment did not return to the pretreatment status (p = .03). The total of force at the 3-month follow-up visit increased significantly (p = .009) compared with that at the pretreatment. The asymmetric ratio of occlusal force at the 1-month follow-up visit was restored to pretreatment. Concerning the occlusion time, no significant changes were observed for any time intervals (p = .069). The VDO was recovered at the 1-month follow-up visit. The statistical analysis of TMJ dysfunction showed no significant differences in the Di and TMJ dysfunction symptoms before and after treatment (p > .05).
CONCLUSION
After undergoing eight PMC restorations under general anesthesia, occlusal re-equilibration was attained approximately after 1 month. There were no significant signs and symptoms of TMJ dysfunction after treatment.
Topics: Child; Child, Preschool; Crowns; Dental Occlusion; Female; Humans; Infant; Male; Molar; Temporomandibular Joint; Tooth, Deciduous
PubMed: 35484864
DOI: 10.1111/ipd.12970 -
Medicina (Kaunas, Lithuania) Sep 2022The excessive use of smartphones for various tasks led to a new adverse postural phenomenon called text neck. The aim of this study was to investigate the effect of the...
The excessive use of smartphones for various tasks led to a new adverse postural phenomenon called text neck. The aim of this study was to investigate the effect of the text neck posture (TNP) on static occlusion by using the T-Scan III occlusal diagnostic system. : Nineteen subjects (aged 20 to 24 years) were considered for this research. They had normal values for anterior overbite and overjet, Angle Class I occlusion, no posterior crossbite, and no signs or symptoms of cervical or temporo-mandibular disorders. Occlusal registrations were performed with the T-Scan III system in a normal, neutral head posture (NHP), as well as in the TNP. The investigated parameters were: occlusion time (OT), asymmetry index of the occlusal force (AOF), percent of the maximum movie force (%MMF), and the time elapsed from the last occlusal contact until the maximum intercuspation (MAT-OTB). The last three parameters were analyzed in the maximum area frame (MA) of the registrations. For the statistical analysis of the recorded data, the Wilcoxon Signed Ranks test and the Spearman's correlation coefficient were used. The following values were obtained in NHP and in TNP: for AOF, 14.88 ± 10.39% and 18.04 ± 12.83%, respectively; for OT, 1.34 ± 1.84 s and 1.32 ± 1.8 s, respectively; for the %MMF, 97.5 ± 2.83% and 96.31 ± 3.17%, respectively; for MAT-OTB, 2.08 ± 1.82 s and 1.45 ± 2.3 s, respectively. There were no statistically significant differences between the static occlusal parameters measured in NHP and those in TNP. However, the high values of the AOF and OT in NHP revealed an imbalance of the occlusal force distribution between the right and left side in maximum intercuspation (MI), as well as a lack of simultaneity of static occlusal contacts. Furthermore, there was a significant, direct, and strong correlation between OT and AOF in NHP. The NHP should not be used as the starting position in TNP simulations in T-Scan studies, so as to avoid statistically insignificant differences between static occlusion in NHP and TNP. The healthy standing subjects, with normal occlusal relationships from the clinical point of view, revealed an occlusal instability in NHP when examined with the T-Scan.
Topics: Bite Force; Chest Pain; Dental Occlusion; Humans; Malocclusion; Posture; Temporomandibular Joint Disorders
PubMed: 36143980
DOI: 10.3390/medicina58091303 -
Indian Journal of Dental Research :... 2021To propose a new technique, based on cephalometrics for determining the vertical dimension of occlusion (VDO).
AIM
To propose a new technique, based on cephalometrics for determining the vertical dimension of occlusion (VDO).
METHODS AND MATERIAL
Thirty-five participants in the age range of 20.
–
22 years who met the inclusion criteria were recruited. Lateral cephalograms were obtained and tracing done. Five reference landmarks, Nasion (N), Anterior Nasal Spine (ANS), Porion (P), Gonion (G) and Gnathion (Gn) were marked and joined to form four angles, N-ANS-Gn, N-ANS-G, P-G-Gn and P-G-ANS; distance between ANS and Gn was considered as VDO in cephalogram (VDO-Ceph). The angles N-ANS-Gn and N-ANS-G; P-G-Gn, and P-G-ANS were correlated; two simple linear regression models were developed to predict N-ANS-Gn and P-G-Gn, using N-ANS-G and P-G-ANS, as independent variables. Using the formulae, the predicted angles, N-ANS-Gn and P-G-Gn were drawn and intersection marked as 'reconstructed point Gn'. The predicted VDO-Ceph values (distance between ANS and reconstructed Gn) were measured and correlated with actual values.
RESULTS
The angles N-ANS-Gn and P-G-Gn had a statistically significant positive correlation with N-ANS-G (r = 0.77, P < 0.001) and P-G-ANS (r = 0.83, P < 0.001), respectively. Using simple linear regression analysis, the following formulae were obtained: N-ANS-Gn (in degrees) = 1.271 N-ANS-G (in degrees) + 24.83 and P-G-Gn (in degrees) = 0.987 P-G-ANS (in degrees) + 35.93. The predicted and actual VDO-Ceph values showed no statistical significance difference (P = 0.92).
CONCLUSION
By tracing four cephalometric landmarks, N, ANS, P, G; and using the angular reconstruction, it is possible to predict the location of Gn. Hence, during prosthetic replacement of lost teeth, this can be employed for the estimation of lost dimensions.
Topics: Cephalometry; Head; Humans; Tooth Loss; Vertical Dimension
PubMed: 34269233
DOI: 10.4103/ijdr.IJDR_783_18 -
International Journal of Oral and... Jan 2021This systematic review aimed to compare the Erich arch bars (EABs) with intermaxillary fixation (IMF) screws in maxillofacial fractures involving dental occlusion on... (Meta-Analysis)
Meta-Analysis
This systematic review aimed to compare the Erich arch bars (EABs) with intermaxillary fixation (IMF) screws in maxillofacial fractures involving dental occlusion on perioperative parameters. Four electronic databases were searched: MedLine (Pubmed), Web of Science, VHL, and Cochrane Library. Inclusion criteria comprised clinical trials comparing the two IMF methods, assessing at least one of the outcomes: occlusal stability, oral hygiene, quality of life, time to apply and remove IMF appliances, and complications. Risk of bias was evaluated through the Cochrane risk of bias tool. Fifteen papers were included in the qualitative analysis and 12 of those in the meta-analysis. Times for EABs application (mean difference (MD) 46.83; 95% confidence interval (CI): 30.63-63.02) and removal (MD 22.89; 95% CI 14.61-31.17) were longer compared with IMF screws. There is higher risk of glove perforation (risk ratio (RR) 3.81; 95% CI 2.41-6.04) and lower risk of iatrogenic injuries (RR 0.21; 95% CI 0.09-0.48) when placing EABs compared with IMF screws. No significant differences in plaque index were found (MD 1.07; 95% CI -0.17 to 2.31). The quality of this evidence ranged from very low to low and was mainly compromised by risk of bias assessment. Further studies are necessary to evaluate transurgical IMF stability and postoperative occlusal quality and quality of life when comparing EABs with IMF screws.
Topics: Bone Screws; Dental Occlusion; Fracture Fixation, Internal; Humans; Jaw Fixation Techniques; Mandibular Fractures; Quality of Life
PubMed: 32798159
DOI: 10.1016/j.ijom.2020.07.022 -
Primary Dental Journal Mar 2020The effects of breastfeeding on the occlusion have been much debated, and it is often suggested that breastfeeding facilitates optimal development of the jaws and the...
The effects of breastfeeding on the occlusion have been much debated, and it is often suggested that breastfeeding facilitates optimal development of the jaws and the dentition, thus preventing the development of a malocclusion. Despite these claims, the evidence is equivocal, and the majority of studies are of low quality and only assess the deciduous dentition. Therefore, at present there is currently no high quality evidence to support claims that breastfeeding has a positive effect on the occlusion, thus the method of feeding should be chosen due to the health benefits and personal preference, not due to any claims regarding occlusal benefits that cannot be substantiated.
Topics: Bottle Feeding; Breast Feeding; Dental Occlusion; Female; Humans; Malocclusion; Tooth, Deciduous
PubMed: 32519605
DOI: 10.1177/2050168420911027 -
Orthodontics & Craniofacial Research Aug 2020Abnormal use of muscles of tongue and lips is called orofacial myofunctional disorders (OMD). In this study, we aimed to investigate the interrelation between occlusal...
OBJECTS
Abnormal use of muscles of tongue and lips is called orofacial myofunctional disorders (OMD). In this study, we aimed to investigate the interrelation between occlusal findings and OMD in primary and mixed dentition and to find out the reasons for malocclusions, and the effect modification of these associations by the number of sources that parents used to receive the information on child oral health issues (NSI).
SETTING AND SAMPLE POPULATION
Cross-sectional study was performed in one kindergarten in Latvia (cluster sampling). The study sample comprised 141 children-mothers' pairs of pre-school children aged 4-7 years.
MATERIALS AND METHODS
Children' myofunctional situation, occlusion and speech defects were assessed during an examination. Children's mothers were interviewed on their socio-demographic situation, feeding and habits of the child, history of diseases and NSI. Multiple logistic regression models adjusted for lip power, swallowing, breathing and speech cases of long respiratory diseases, age and gender were built to investigate associations between the types of occlusion and OMD/health characteristics. Effect modification of these associations by NSI was analysed.
RESULTS
Types of occlusion associated with OMD/health characteristics were as follows: normal occlusion with prolonged respiratory diseases (odds ratio, OR = 0.345 [95% confidence interval, CI 0.16; 0.75]); combined type with tongue thrust habits (OR = 3.11 [0.99; 9.90]), lip-closing strength (OR = 0.99 [0.98; 0.99]); and cross-bite with speech (OR = 3.55 [1.07; 11.78]). These associations remained stable when parents used two or less sources of information on children's oral health.
CONCLUSIONS
To facilitate occlusal stability, early interdisciplinary examinations should be performed to prevent time-consuming and cost-consuming treatment.
Topics: Child; Child, Preschool; Cross-Sectional Studies; Dental Occlusion; Dentition, Mixed; Humans; Latvia; Malocclusion
PubMed: 31989782
DOI: 10.1111/ocr.12367 -
The Journal of Prosthetic Dentistry Jun 2021The purpose of this technique report was to describe a fully digital technique to evaluate the mandibular position both in centric relation occlusion (CRO) and maximal...
The purpose of this technique report was to describe a fully digital technique to evaluate the mandibular position both in centric relation occlusion (CRO) and maximal intercuspation position (MIP). The procedure transfers data relative to the position of the maxillary and mandibular dentition to a virtual articulator based on a single cone beam computed tomography (CBCT) image. A CBCT scan of the patient was obtained in CRO, and the maxillary and mandibular casts were scanned both in CRO and MIP with an intraoral scanner. The model CRO scan data were registered on the dental part of the CBCT image by using a virtual articulator program, and a virtual facebow transfer process and mounting was performed. The virtual articulator was positioned in the right and left condyle medial pole and right orbitale. The mandibular position was evaluated in CRO and MIP by superimposing the data of the mandible position in both CRO and MIP. A quantitative 3D measurement was obtained by using the grid function. Based on this protocol, it is possible to use a fully digital approach to transfer the position of a patient's maxillary dentition to a virtual articulator based on the data from a single CBCT scan and intraoral scans. This technique eliminates the traditional facebow transfer and mounting process and complicated laboratory procedures for evaluating mandibular positional changes in CRO and MIP.
Topics: Cone-Beam Computed Tomography; Dental Articulators; Dental Occlusion; Humans; Jaw Relation Record; Mandible; Models, Dental
PubMed: 32624222
DOI: 10.1016/j.prosdent.2020.04.002 -
International Journal of Environmental... Mar 2023This study evaluated the occlusal relationships in students with bruxism, using the T-Scan III system, and their correlation with the activity of the masticatory muscles...
This study evaluated the occlusal relationships in students with bruxism, using the T-Scan III system, and their correlation with the activity of the masticatory muscles assessed through surface electromyography (sEMG). The study group was divided into two subgroups (based on self-reporting): 20 participants with possible bruxism and 20 participants without possible bruxism; all participants underwent the following evaluations: sEMG recordings using the dia-BRUXO device for masticatory muscles assessment, as well as static and dynamic occlusion using the T-SCAN III system. The analysis of the maximum intercuspidal (MI) position revealed a positive moderate association between the values of the occlusal forces in MI distributed along the two hemiarches, and the number of grinding events during daytime, which was statistically significant ( < 0.05). The analysis of protrusion movements reflected statistically significant differences between the non-working interferences and sEMG parameters specific to bruxism ( < 0.05). The analysis of laterotrusion movements indicated that participants with anterolateral guidance presented higher values of awake bruxism indexes and higher values of clenching events during nighttime. For all three mandibular movements, their duration was higher for the study group compared to the control group. Therefore, this study confirmed the utility of sEMG recordings in the bruxism diagnosis process, as well as the association between dental occlusion and bruxism.
Topics: Humans; Bruxism; Cross-Sectional Studies; Dental Occlusion; Romania; Students, Dental; Electromyography
PubMed: 36981784
DOI: 10.3390/ijerph20064877 -
Sensors (Basel, Switzerland) Mar 2024Body biomechanics and dental occlusion are related, but this interaction is not fully elucidated. The aim of this study was to investigate the association between body...
Body biomechanics and dental occlusion are related, but this interaction is not fully elucidated. The aim of this study was to investigate the association between body posture and occlusion in patients with and without dental pathology. A cross-sectional study was carried out with 29 patients divided into a control group and a group with pathology (malocclusions). Body posture was evaluated by dynamic baropodometry, analyzing parameters such as the line of gait and the anteroposterior and lateral position of the center of pressure (CoP). Occlusion was classified radiographically according to the sagittal skeletal relationship. Results showed significant differences in mean position phase line between groups ( = 0.01-0.02), with means of 115.85 ± 16.98 mm vs. 95.74 ± 24.47 mm (left side) and 109.03 ± 18.03 mm vs. 91.23 ± 20.80 mm (right side) for controls and pathologies, respectively. The effect size was large (Cohen's d 0.97 and 0.92). There were no differences in the anteroposterior ( = 0.38) or lateral ( = 0.78) position of the CoP. In gait analysis, significant differences were observed in left (548.89 ± 127.50 N vs. 360.15 ± 125.78 N, < 0.001) and right (535.71 ± 131.57 N vs. 342.70 ± 108.40 N, < 0.001) maximum heel strength between groups. The results suggest an association between body posture and occlusion, although further studies are needed to confirm this relationship. An integrated postural and occlusal approach could optimize the diagnosis and treatment of dental patients.
Topics: Humans; Cross-Sectional Studies; Dental Occlusion; Posture; Malocclusion; Gait
PubMed: 38544184
DOI: 10.3390/s24061921