Anterior Tooth Relationship in Cuspid Protected and Group Function Occlusion

OBJECTIVE OF INVESTIGATION: The aim of the study was to determine anterior tooth relationship (overbite and overjet) according to the type of occlusion (canine guided, group function). METHODS: A total of 111 test subjects (56 men and 55 women, mean 23.9 years of age) were examined, and it was determined that they have occlusional conception. The relationship of the front teeth in the position of maximum intercuspidation was evaluated by a portable meter. RESULTS: By analysing the obtained results of vertical overjet and horizontal overbite of the front teeth, we concluded that there was significant statistic difference in the amount of the vertical overjet with regard to occlusional conception (t=6.669, p=0.00001). Average value of the vertical overjet in examinees with occlusion lead by the canine was 2.22+0.09 mm, while in examinees with group function it was 1.58+0.26 mm. No significant statistical difference was found by analysing vertical overjet with regard to gender. No significant statistical difference between the groups was found by comparing the results of horizontal overbite of frontal teeth with regard to occlusional concepcion and gender. Average value of horizontal overjet was 1.62+0.29 mm. CONCLUSION: Subjects with canine guided occlusion have significantly and statistically bigger overjet of frontal teeth

An Evaluation of the Quality of Tooth Preparation with Intraoral Parallometer-Axisgraph - Pilot Study

Measuring of the axial angle in practice shows an average angle of 20 degrees. The result of the high taper angles is a nonsatisfactory resistance form in 22.5% cases. The purpose was to examine the efficiency of the Jonjić oral parallelometer, known as the "AXISGRAPH", with respect to basic ergonomic rules, leading to savings in working energy and time and an increase in the quality of the preparation. METHODS: On the basis of clinical cases models were made of the upper and of the lower jaw of acrylic resin. The practitioner, who has 10 years experience, initially prepared each model set in a KAWO-EWL model, conventionally using freehand preparation, and then with an Axisgraph. Both models were in the same condition. Comparison was made between the time required for preparation, working energy used, and the quality of the preparation. The quality of the preparation was determined using the axial angle of the prepared tooth, measured by the method described in Jonjic\u27s dissertation. RESULTS: The freehand preparation took 80 minutes while preparation with the Axisgraph took 50 minutes. The average angle in freehand preparation was 15.03 degrees while, (the average angle of preparation was 10.4 degrees) using Axisgraph, and in 30 minutes less time than the freehand preparation. CONCLUSION: Preparation with the Axisgraph significantly saves time on preparation and allows better quality for the prepared tooth

Influence of the Type of Occlusion on the Occurrence of Noncarious Cervical Lesion

INTRODUCTION: The term \u27noncarious cervical lesions’ (NCCL) stands to indicate the loss of hard tissue at the tooth cervix. This loss can be caused by different physical and/or chemical agents. One of the causes of NCCL can be occlusal stress, which lead to toothflexure and loss of enamel at the cervical area. In different types of occlusion there are numerous lateral eccentric movements that can cause NCCL. The purpose of this study was to determine differences in the frequency of NCCLs between patients with different occlusal conception. METHODS AND RESULTS: The study involved 815 persons over the age of 10 years, chosen at random. The cervical third of the vestibular surface of the upper and lower teeth was clinically examined. NCCLs were measured with plus and minus. The type of occlusal conception was established by clinical examination and classified as canine guidance, group function and combined occlusion. The results showed that the NCCLs were equally participate in both sexes, and in all three types of occlusion (Chi-square values were 1.96, df=2, p>0.05). CONCLUSION: The results of the study indicate that there is no statistically significant difference in the frequency of NCCLs between patients with different occlusal

The Late-Effect Of X-Irradiation on the Mouse Submandibular Gland

INTRODUCTION: Life-long severe xerostomia is a common complication after radiotherapy of head and neck malignancy. It is a clinical entity which causes a great deal of suffering and disability for the patient. Saliva is an important factor for denture retention. Hyposalivation causes reduced retention of full dentures. The aim of the study was to determine late consequences of irradiation in the mouse submandibular gland. MATERIAL AND METHODS : Mouse submandibular glands were locally X-irradiated by single dose irradiation with 15Gy. Day 90 post-irradiation tissues were analyzed by morphology and morphometry. RESULTS: Strong vacuolization of almost all acini was noted. Kariopyknotic nuclei were found in numerous acini and the largest amount of acini was in the lysis. The epithelial cells of the granular convoluted tubule were degenerated and desquamated in the lumen, and some granular convoluted tubules were in the lysis. In the interstitial connective tissue disseminated focal mononuclear infiltrate was found. With respect to the control group a statistically significant decrease in the number of acinar cells (p<0.001) was determined, as well as a significant increase in the number of granular convoluted tubule cells (p<0.001). Whereas the number of intercalated duct cells was not different with respect to the control (p=0.10). CONCLUSION: The results of this study suggest that hypofunction in the late stage is a consequence of morphological changes and loss of acinar cells. The patients should use a saliva substitute to alleviate their symptoms easier