Comparison of group function occlusion and canine guided occlusion among partially edentulous patient – A retrospective study

Group function occlusion, as well as Canine guided occlusion, are important in the field of . The study about the occlusion includes not only the static relationship of teeth, but it also includes the functional interrelationship and all the components of the system. The aim of the study is to compare group function occlusion and canine guided occlusion among partially patients. The study was conducted in the outpatient of Dental College and Hospital. The data was reviewed and from the total number of 86000 patients between June 2020. The data includes both group function occlusion and canine guided occlusion patients with a partially condition. Then the data was manually verified by 1-2 reviewers and finally tabulated, and SPSS imported and got the results. 522 Data was included in that males are 55.7% and females are 44% and 0.1% transgender. In that majority of them belong to the age group (31-40) yrs. The group function occlusion is 59.5%, and canine guided occlusion is 40.42%, This shows that Male predominant is seen with group function occlusion. Overall, the results showed that in partially conditions, the canine guided occlusion is more prevalent in male gender when it is compared with group function occlusion.

To Evaluate the Severity, Distribution of Occlusal Tooth Wear and its Correlation with Bite Force in Young North Indian Adults

Aim: To determine the severity and distribution of occlusal tooth wear among young North Indian adults and to evaluate the correlation of occlusal tooth wear with bite force. Materials and Methods: A total of 164 subjects were enrolled in the present study. Inclusion criteria included subjects with age range of 25-40 years having a full complement of natural dentition (excluding third molars), with no history of orthodontic treatment, FPD and trauma. Maxillary and mandibular casts of each subject were taken. Tooth wear score of anterior and posterior teeth of both the arches was calculated using a five-point (0 to 4) ordinal scoring system. The calculated tooth wear scores were then compared with data concerning age, sex, number of daily meals, vegetarian/non-vegetarian diet, Group function/Canine guided occlusion and bite force. Nonparametric (Mann-Whitney) test was used to determine the relationship between various factors and occlusal tooth wear. Spearman’s correlation coefficient was used to determine the correlation between tooth wear and bite force. Results: After applying statistical analysis to the data collected, total tooth wear score of the whole sample was 30.07 ± 6.39. Anterior teeth had significantly higher wear score than posteriors (P < 0.01). Males showed significantly higher (P < 0.001) tooth wear in both arches factors such as bite force and age showed significant correlation with tooth wear (P=0.000), however, the number of meals taken per day did not show any significant correlation. Higher tooth wear loss was seen in non vegetarian dietary pattern but it was statistically insignificant. It was also found that Group function occlusion showed significantly higher mean tooth wear loss 45.76 ± 9.19 as compared to Canine guided occlusion 26.37 ± 10.68 (P=0.000).

Electromyographic Activity Changes of Jaw-Closing Muscles in Patients with Different Occlusion Schemes after Fixed Prosthetic Restoration

SummaryBackground/Aim: To investigate the electromyographic (EMG) activity changes of jaw-closing muscles in patients with different occlusion schemes and posterior edentulous span, after the placement of teeth-supported fixed partial denture (FPD).Material and Methods: The study sample consisted of 20 patients (10 men and 10 women, the mean age being 50 years) with a posterior edentulous area that includes two missing premolars or one premolar and one molar. The participants were divided into two groups with different occlusion schemes: canine-guided occlusion (CGO) and group function occlusion (GFO). The metal-ceramic FPD were fabricated according to the clinic-standardized protocol. EMG activities of masseter and anterior temporalis patients’ muscles were recorded with bipolar surface electrodes during maximal voluntary clenching. EMG evaluation was repeated twice: (T1) before the fabrication of FPD (T2) after eight weeks of FPD cementation and intraoral functioning of restoration. The data were subjected to Analysis of Variance–ANOVA within the methodological framework of the General Linear Models with Repeated Measures. The Bonferroni test was used to compare multiple mean measures. Statistical analysis was conducted with SPSS ver. 11.5. The level of significance was predefined at a=0.05.Results: Group 1 with CGO presented significantly higher levels of masseter (mean maximum EMG average before 79.36μV and 139.68μV after) and temporalis (mean maximum EMG average before 79.07μV and 149.37μV after) EMG activity after FPD placement. Group 2 with GFO also showed significantly higher levels of masseter (mean maximum EMG average before 61.57μV and 165.30μV after) and temporalis (mean maximum EMG average before 56.94μV and 133.08μV after) EMG activity after the prosthetic restoration.Conclusions: It may be concluded that fixed prosthetic restoration, in both patients with canine-guided and group function occlusion, results in increased EMG jaw-muscle activity.

The Relationship between Eccentric Occlusion with Temporomandibular Disorders (TMD) and Para-functional Habits among Dentistry Students of Tabriz University of Medical Sciences in 2017

Aim: The aim of this study is to investigate the relationship between side occlusion with temporomandibular joint problems (TMD) and parafunctional habits among Dentistry Students of Tabriz University of Medical Sciences. Materials and Methods: In this cross - sectional study, 98 students from the School of Dentistry of Tabriz University of Medical Sciences were randomly selected, and the occlusion was also examined. Data from the study were analyzed using descriptive statistics and chi-square test software SPSS 17. Results: In this study, 16.33 % of population had Group function occlusion, 13.23 % had Anterior Group function occlusion and 70.4 % had canine raise occlusion. 3.1% of people had functional Paralympic symptoms of Bruxism and 6.1 % were marked with Parafunctional clenching. The study population consisted, all patients with Group function occlusion that had para-functional habits. However, in patients with canine raised occlusion, 63.3 % para-functional habit parameters, 2 % has Bruxism and 1.5 % had clenching. Conclusions: a significant relationship was not observed between side occlusion with parafunctional habits and TMD problems among students of Tabriz University of Medical Sciences.

Assessment of the Effect of Two Occlusal Concepts for Implant-Supported Fixed Prostheses by Finite Element Analysis in Patients With Bruxism

The aim of this study was to evaluate the effects of bruxing forces on implants configured under 2 different occlusal schemes by dynamic finite element analysis. A main model consisting of a 5-unit fixed partial denture supported by 3 implants was simulated with bone, implants, and superstructures. All calculations were made individually for each component, namely porcelain crowns, abutments, abutment screws, implants, and bone. Maximum stresses were found in the group-function occlusion. Group-function loading may result excess stresses on the components compared with canine-guidance loading. According to the results of this study, use of canine guidance is encouraged in bruxers with implant-supported prostheses.