Thao final-thesis
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- Wisdom teeth typically erupt between ages 18-25 and often cause problems requiring extraction. There are many complications associated with third molar extraction due to root variants. - The study examined variants in root numbers and morphology of wisdom teeth using panoramic x-rays and CT scans. It found that most patients had 2 roots, with fused roots being the most common variant. - When root variations were present, variations in morphology also occurred in 23% of cases. Panoramic x-rays correctly identified wisdom tooth roots in 77% of cases.
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Thao final-thesis
- 3. • The latest teeth erupt between the ages of 18 and 25 • They often cause many problems therefore need to be extracted • There’re a lot of complications before, during and after 3rd molar extraction one of the reasons was the variant of roots causing confused diagnosis.
- 5. The variants of wisdom teeth Normal Variants 48
- 7. 2-D image ( Panorama X-ray) 3-D image ( CT X-ray)
- 8. Number of root Research 1 2 ≥ 3 Jun-Beom Park(2013) 37,9% 56,5% 1,9% Heinz-Theo Lübbers(2013) 86,7% 13,3 % Maryam Kuzekanani (year) 11.5% 73% 5,5% Reviews of the recent related studies
- 14. The variables Identified index Data collection 1. General variable Age (calendar year) Interviewed Gender (Male/Female) Name of tooth (International regulations) 2. Similar to the roots of 2nd molar 2 separate roots, the roots curved distally Observed 3.Variations by quantity 1 root (single root) Observed More than 3 roots 4. Variations by morphology Equal length roots Observed Fused roots Apical fused roots Straight roots Mesio-angular roots 5. Compare with Panoramic X- ray Conformity Observed Nonconformity Research sheet
- 15. Age Total 11-20 21-30 31-40 41-50 51-60 57 5 31 16 4 1 100% 8.8 54.4 28.1 7.0 1.8 Consistent with the formation and evolution of wisdom tooth Table 1: Ratio distribution of patients by age 1. Status distribution of patients by age
- 16. 14% 86% Similar to the root shape of 2nd molar Variants The variant had a high ratio, consistent with the reviews of Hoang Tu Hung and the other scientists 2. The appreance of the variant lower wisdom teeth
- 17. 0% 20% 40% 60% 80% 100% 1 root 2 roots 3 roots 4 roots 12.30% 77.20% 8.80% 1.80% 3. Variations by quantity The tendency of result is similar to the results of M. Kuzekanani (73% two roots) , J. Park (56.5% two roots), Sarasswati F.K (67% two roots) with highest rate is 77.2% in 2 roots group
- 18. 0% 25% 50% 75% 100% 10.50% 31.60% 3.50% 10.50%15.80% 19.30% 8.80 % Fused roots had the highest proportion of 31.6%, similar to the reviews of Hoang Tu Hung 4. Variations by morphology Figure 3: Proportion of variations by morphology
- 19. 0% 20% 40% 60% 80% 100% Variations by quantity Variations by morphology Combination 22.80% 80.70% 23% Figure 4: Combination of variations by quantity and by morphology 5. Combination of the variations by quantity and morphology The combination were 23 %. when the variations by quantity appeared, the one by morphology appeared too. This result was consistent with Hoang Tu Hung P<0.05
- 20. 77% 23% Conformity Nonconformity 6. Investigation of the concordance of Panoramic X-ray Sarasswati F.K: the ratio of true positives of Panoramic X-ray in supporting diagnosis was notable high (66.6 %- 83.3 %),
- 23. 1 root 2roots 3 roots
Editor's Notes
- Lady and gentlement, my name’s Minh Thao iam final year student of Haiphong university of medicine and pharmacy, Faculty of Dentistry. Today it’s my honor to stand here and present my thesis: under the guidance of professor Pham Van Lieu, and DDS Pham Thanh Hai
- My presentation include 5 parts:
- As you know Wisdom teeth, or third molars, are the latest teeth in the development of permanent dentition. They generally erupt between the ages of 18 and 25 and often cause many problems such as Adjacent second molar caries, pulpitis, cellulitis, malocclusion, therefore need to be extracted. There’re a lot of complications before, during and after 3rd third molar extraction…..
- In the world and in VN there were a lot of study about the wisdom teeth, morphology of wisdom teeth and about the role of Panoramic Xray in diagnosis and prognosis in impacted mandibular third molars.
- In the book dental anatomy of Hoang Tu Hung, he said that, Normally, the root external morphology of wisdom tooth was similar to this one of the 2nd molar: had 2 root: misial root and distal root. The root were curved distally. But.. The majority of their roots was variant. You can see this wisdom tooth had fused roots, and this one had 4 roots, and this one had an accessory root.. ,
- You can see in this panaroma, the root shape of 38 was similar to the root shape of 37 And here in this Panoramic X-ray You can see the Panoramic image was conformity with the real tooth. (38)
- And in this case. You can see clearly that the panorama was not conformity with the real root. we had to use CT scanner to determine exactly the root shape. In this case the root curved bucally.
- Let focus on some review of the recent related studies. All most of these studies showed that the majority of wisdom teeth had 2 roots. And about the role of Panorama le duc lanh said:
- To raise the quality of diagnostic and treatment in impacted mandibular 3rd molars, this study was proposed with 2 objectives….
- Now we move on the next part: The meterial include : Design of the study was
- The next part is my results and discussion. Let’s take a look at the table 1: as you see The ratio of patients in the age group 21-30 and 31-40 had higher percentage (54.4% and 28.1%) more than in the remaining groups. This results was consistent with the form...
- Now take a look at| the F1 we talk about the ratio of variants in mandibular wisdom teeth. In total of 57 lower impacted wisdom teeth were extracted the percentage of lower wisdom teeth which similar to the 2nd molar root was 14%. The ratio of variants was 86%. This results consistent with
- Now I would like to move on to the F2 : as we can see the Proportion of wisdom teeth having 2 roots (normal quantity) was high as 77.2%. Variant root having 1 root had the highest proportion being of 12,3% (accounting to 53.7% of total variations in quantity) Variant root having 3-4 roots had a low rate (8.8% and 1.8%)
- Next, we focus on the F3 : you can see that the Proportions of normal roots made up to 19,3 %, the others had proportion was 8,8% Fused roots had the highest proportion of 31.6%, followed by mesio - angular roots with percentage of 15.8%. Equal length roots, straight roots contributed to 10.5% while apical fused roots made up only 3.5%. The majority of root morphology were fused. similar to previous studies, like the study of Hoang Tu Hung, showed that The majority of wisdom tooth had fused roots.
- Continue with the figure 4. You can see clearly that the ratio of variations by morphology was very high, more than the variations by quantity. And the combination were 23 %. The difference was statistically significant. We find out that when the variations by quantity appear, the variations by morphology appear too. This result was consistent with the review of Hoang Tu Hung. The restriction of this study was the number of studied teeth still small, so have not reflected fully about the variations of impacted lower wisdom teeth, and about the relationship between the variations.
- Finally, look at the F5: you can see Most of Panoramic X- ray assessed correctly the image of impacted wisdom teeth but still had a percentage that nonconformity that because the roots or the root apex were obscured, because of limited of Panoramic X- ray, just reflects two-dimensional space.
- From the results, let me present the conclusions of my study. Firstly
- Finally|I would like to propose|two recommendations
- I’ve come to the end of my presentation, thank you so much for your attention.