Advanced Dental Technology Center

Pathum Thani, Thailand

Advanced Dental Technology Center

Pathum Thani, Thailand
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Karnasuta P.,Rangsit University | Plianrungsi J.,Rangsit University | Denkongpon I.,Rangsit University | Horsimasathaporn N.,Rangsit University | And 8 more authors.
Oral Radiology | Year: 2017

Objective: The physiology of the mandibular nerve is an important factor relevant to successful implant planning and surgical procedures in the mandible. Variability among ethnicities may influence the particular safety guidelines for each population. In this study, we retrospectively examined the incidences of canal orientations and variations in Thais using cone-beam computed tomography (CBCT) radiography. Methods: CBCT images of 441 mandibular sides of 248 patients aged 20 to 82 years (mean age, 43.7 years) were examined. The incidences of canal courses and variations were assessed by two calibrated observers (Cohen's kappa coefficient >0.8). Descriptive and bivariate statistics were analysed for categorical findings. A p value of <0.05 was considered statistically significant. Results: Two common canal courses were identified: linear curve (Type 1, 39.9%) and elliptic-arc curve (Type 3, 48.1%). In addition, one-fifth of the patients had bifid canals (20.6%). There was a short supplemental canal extending to the second or third molar (Type 2, 53.8%) and a supplemental canal arising in the retromolar pad region (Type 4, 46.2%). An anterior loop was identified in 74.2% of the cases and was frequently bilateral (78.3%). Conclusions: Effective examination of the canal anatomy should be considered prior to surgical procedures because of the shallow curve of the mandibular canal with a high incidence of an anterior loop. In addition, the position of bifid canals was associated with an increased risk of neurovascular alteration in implant placement, sagittal split ramus osteotomy, and retromolar bone harvesting. © 2017 Japanese Society for Oral and Maxillofacial Radiology and Springer Japan


Phannurat P.,Advanced Dental Technology Center | Tharanon W.,Advanced Dental Technology Center | Sinthanayothin C.,National Electronics and Computer Technology Center
Transactions on Electrical Engineering, Electronics, and Communications | Year: 2011

The mass-spring model has been used to describe elastically deformable models such as skin, textiles, and soft tissue in computer graphics. A mass-spring mesh is composed of a network of masses and springs, in which each edge is a spring. We apply the mass-spring system to mesh deformation in 3D orthodontic simulation, the movement of which is evaluated using the numerical integration of the fundamental law of dynamics based on the 4th-order Runge-Kutta method. Computational quantity and accuracy is demonstrated on test and dental cast model examples. The experimental results show that it can simulate the deformation change in real time and display the results vividly.


Inglam S.,Thammasat University | Suebnukarn S.,Thammasat University | Tharanon W.,Advanced Dental Technology Center | Apatananon T.,National Metal and Materials Technology Center | Sitthiseripratip K.,National Metal and Materials Technology Center
Medical and Biological Engineering and Computing | Year: 2010

The purpose of this study was to investigate the biomechanical effects of graft stiffness and progression of marginal bone loss (MBL) in the bone surrounding an implant placed in a maxillary grafted sinus based on the finite element method. The simulating model of graft stiffness as well as depth of MBL was varied to simulate nine different clinical scenarios. The results showed that the high-level strain distributions in peri-implant tissue increased with the increase in MBL depth when the stiffness of the graft was less than that of the cancellous bone (less stiffness graft models). The strain energy density (SED) value showed that a slight MBL depth (1.3 mm) with medium stiffness of grafted bone can reach the optimal load sharing due to the exhibited similar values of SED in the crestal cortical, cancellous, and grafted bone. With progression of MBL and the decrease in graft quality, maximal displacement of the implant increased considerably. Our results demonstrated that the effects of the two investigated factors (progression of MBL and graft stiffness) on the biomechanical adaptation are likely to be interrelated. The results also reveal that for clinical situations with poor grafted bone quality and progression of MBL, it is critical to consider implant stability. © 2010 International Federation for Medical and Biological Engineering.

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