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Detection of maxillary second molar with two palatal roots using cone beam computed tomography: a case report.

Journal of Dental Rehabilitation and Applied Science.2016;32(1):87-92. doi:10.14368/jdras.2016.32.1.87

The purpose of this clinical report was to show anatomical variations in permanent maxillary second molar using computed tomography (CT). This case report describes the application of CT to detect the unusual root anatomy of maxillary second molar with 2 separate palatal roots for successful endodontic treatment procedures. The use of cone beam computed tomography (CBCT) can overcome the limitation of the periapical standard radiography caused by the overlap of buccal and secondary palatal roots.
Cone-Beam Computed Tomography* ; Molar* ; Radiography

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A clinical case of hybrid telescopic double crown using friction pin with an isolated few remaining teeth.

Sang Hyuk SOHN ; Jin Hyun CHO ; Sung Am CHO

Journal of Dental Rehabilitation and Applied Science.2016;32(1):80-86. doi:10.14368/jdras.2016.32.1.80

A few authors have reported good clinical results using double crown removable partial denture (RPD) with a few remaining teeth. Hybrid telescopic double crown is a good indication for a patient with poor periodontal condition and/or few remaining teeth after extraction, especially located in cross-arch position. In this case, there was a poor periodontal condition with teeth mobility. Several teeth with poor prognosis were extracted. Remaining anterior teeth was restored with fixed prostheses and edentulism was restored with Kennedy class I removable partial denture in maxilla. In mandible, it was hard to restore with clasp removable partial prostheses because of bilaterally isolated remaining teeth so that hybrid double crown removable partial denture with friction pin was suitable for this case. The objective of this report is to discuss the characteristics and the utility of hybrid double crown prostheses using a few remaining teeth in mandible.
Crowns* ; Denture, Partial, Removable ; Friction* ; Humans ; Mandible ; Maxilla ; Prognosis ; Prostheses and Implants ; Tooth*

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Orthognathic surgery on Skeletal Class III patiens with collapsed vertical dimension: case report.

Youn Kyung CHOI ; Yong Deok KIM ; Soo Byung PARK ; Yong Il KIM ; Seong Sik KIM ; Woo Sung SON

Journal of Dental Rehabilitation and Applied Science.2016;32(1):70-79. doi:10.14368/jdras.2016.32.1.70

Patients who lost posterior teeth due to periodontitis or dental caries have collapsed vertical dimension, unstable occlusion and change of the mandibular position. In particular, patients in orthognathic surgery, clinician should re-establish the pre-operative stable position of mandibular condyle in articular fossa and favorable vertical dimension for high post-operative stability of mandible. Therefore, interdisciplinary approach and co-operation, including prosthetics, orthodontics, oral and maxillofacial surgeon, from diagnosis and treatment plan is important to get a good outcome. This case report was patients who had collapsed occlusal plane due to severe dental caries on maxillary molars with skeletal Class III malocclusion. Before orthognathic surgery, resetting of maxillary occlusal plane with temporary removable denture was performed. Then successful multidisciplinary approach was done and lead to acceptable clinical outcome.
Dental Caries ; Dental Occlusion ; Dentures ; Diagnosis ; Humans ; Malocclusion ; Mandible ; Mandibular Condyle ; Molar ; Orthodontics ; Orthognathic Surgery* ; Periodontitis ; Tooth ; Vertical Dimension*

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Comparison of digital models generated from three-dimensional optical scanner and cone beam computed tomography.

Hyuk Jin KWON ; Kack Kyun KIM ; Won Jin YI

Journal of Dental Rehabilitation and Applied Science.2016;32(1):60-69. doi:10.14368/jdras.2016.32.1.60

PURPOSE: The objective of this study was to compare the accuracy of digital models from 3 dimentional (3D) optical scanner and cone beam computed tomography (CBCT). MATERIALS AND METHODS: We obtained digital models from 11 pairs of stone casts using a 3D optical scanner and a CBCT, and compared the accuracy of the models. RESULTS: The error range of average positive distance was 0.059 - 0.117 mm and negative distance was 0.066 - 0.146 mm. Statistically (P < 0.05), average positive distance was larger than 70 µm and shorter than 100 µm, and that of negative distance was larger than 100 µm and shorter than 120 µm. CONCLUSION: We concluded that the accuracy of digital models generated from CBCT is not appropriate to make final prostheses. However, it may be acceptable for provisional restorations and orthodontic diagnoses with respect to the accuracy of the digitalization.
Cone-Beam Computed Tomography* ; Dental Casting Technique ; Dental Models ; Diagnosis ; Prostheses and Implants ; Radiography, Dental, Digital

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Changes in occlusal force depending on the movement of the adjacent and opposing teeth after loss of lower first molar: comparative study by using a strain gauge.

Myoung Ja SONG ; Ji Man PARK ; Youn Sic CHUN

Journal of Dental Rehabilitation and Applied Science.2016;32(1):47-59. doi:10.14368/jdras.2016.32.1.47

PURPOSE: The aim of this study was to investigate the changes in occlusal force after loss of the lower first molar depending on the inclination and extrusion of the adjacent and opposing teeth by using a strain gauge. MATERIALS AND METHODS: Anatomic teeth were used to reconstruct the normal dental arch with loss of the lower right first molar. A uniformly thick layer of silicone was applied to the root to mimic the periodontal ligament. Four stages of dies with varying degrees of inclination and extrusion of the adjacent and opposing teeth were constructed and attached to master model interchangeably by using a CAD/CAM fabricated customized die system. The strain gauges were attached to teeth and a universal testing machine was used to determine the changes in occlusal force. An independent t-test and one-way ANOVA were performed (α = .05). RESULTS: While simulating chewing food, the upper first, second premolar and lower second molar showed greater occlusal force than before extraction. When the change of adjacent teeth's occlusal force with their progressive movement after molar loss was evaluated, the difference among four die models was significant and was in the decreasing aspect (P < 0.05). CONCLUSION: When the lower first molar was lost and the adjacent teeth did not move yet, the occlusal force in adjacent teeth was higher than that when the lower first molar still existed. In addition, the occlusal force in the upper premolars and lower second molar decreased significantly with the progressive movement of adjacent teeth.
Bicuspid ; Bite Force* ; Dental Arch ; Mastication ; Molar* ; Periodontal Ligament ; Silicon ; Silicones ; Tooth*

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Study for discriminating method of origin side vibration from non-symptomatic clicking group.

Da Un JUNG ; Dong Wan KANG

Journal of Dental Rehabilitation and Applied Science.2016;32(1):38-46. doi:10.14368/jdras.2016.32.1.38

PURPOSE: study for discriminating method of origin side vibration from non-symptomatic clicking group. MATERIALS AND METHODS: 60 joints vibrations of 30 subjects in non-symptomatic clicking group was recorded via subject's awareness, examiner's palpation and JVA analysis. Origin side vibration was discriminated with consideration for frequency spectrum, time delay and phase shift of waveforms, analysis of numeric values. RESULTS: There were all unilateral vibrations with JVA analysis and number of origin vibrations were 42. 11 pairs of vibrations showed time delay and phase shift and transferred side vibrations showed smaller values of total integral and bigger values of > 300 / < 300 ratio than origin side vibrations except one pair of vibrations. Also as the ipsi-lateral joint vibrations with smaller values of total integral showed bigger values of > 300 / < 300 ratio than the contra-lateral joint vibrations and there all ipsi-lateral vibrations were showed small values of total integral below 10 and hard to detect time delay and phase shift. So the features were used in discrimination of origin side vibrations. CONCLUSION: There should be all-around considerations for discrimination of origin side vibrations that is frequency spectrum, phase shift and time delay and analysis of numeric values.
Diagnosis, Differential ; Discrimination (Psychology) ; Joints ; Palpation ; Temporomandibular Joint ; Vibration*

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C-shaped root canal system in mandibular 2nd molars in Korean people evaluated by cone beam computed tomography.

Miyeon KIM ; Jeonghee KIM ; Sunho KIM ; Byungchul SONG ; Wook NAM

Journal of Dental Rehabilitation and Applied Science.2016;32(1):32-37. doi:10.14368/jdras.2016.32.1.32

PURPOSE: To determine the anatomical characteristic of C-shaped canal systems in Korean mandibular 2nd molars by cone beam computed tomography (CBCT). MATERIALS AND METHODS: The 824 CBCT images were evaluated. These patients were taken CBCT for the diagnosis and treatment of dental implantation on 2013. The 711 mandibular 2nd molars were examined. The configuration of root canal systems were classified according to modified Melton's classifications. RESULTS: Of the 711 mandibular 2nd molars, 21.5% had C-shaped canal systems. This prevalence did not differ with tooth position. Most of the C-shaped canals with bilateral molars were symmetrical. Of the C-shaped canal, the most common configuration Type were Melton's Type I (89%) in the orifice level and Melton's III (83.8%) in the apical level. The prevalence of C-shaped canal was higher in female (25%) than male (13.9%) (P < 0.05). CONCLUSION: A high prevalence of C-shaped canals were observed in Korean mandibular 2nd molars. For successful C-shaped root canal treatment, the comprehension of root canal systems was important.
Classification ; Comprehension ; Cone-Beam Computed Tomography* ; Dental Implantation ; Dental Implants ; Dental Pulp Cavity* ; Diagnosis ; Female ; Humans ; Male ; Molar* ; Prevalence ; Tooth

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Influence of airborne-particle abrasion on flexural strength of fiber-reinforced composite post.

Eun Ju SIM ; Jin Woo KIM ; Kyung Mo CHO ; Se Hee PARK

Journal of Dental Rehabilitation and Applied Science.2016;32(1):24-31. doi:10.14368/jdras.2016.32.1.24

PURPOSE: Many studies have shown that airborne-particle abrasion of fiber post can improve the bonding strength to resin cement. But, airborne-particle abrasion may influence the property of fiber post. The purpose of this study is to evaluate the influence of airborne-particle abrasion on flexural strength of fiber post. MATERIALS AND METHODS: Two fiber-reinforced posts; DT Light Post Size 2 (1.8 mm diameter, Bisco Inc) and RelyX Fiber Post Size 3 (1.9 mm diameter, 3M ESPE); were used in this study. Each group was divided into 3 subgroups according to different surface treatments; without pretreatment: 50 µm aluminum oxide (Cobra®, Renfert): and 30 µm aluminum oxide modified with silica (Rocatec Soft®, 3M ESPE). After airborne-particle abrasion procedure, three-point bending test was done to determine the flexural strength and flexural modulus. The diameter of each posts was measured to an accuracy of 0.01 mm using a digital micrometer. There was no diameter change before and after airborneparticle abrasion. The mean flexural moduli and flexural strengths calculated using the appropriate equations. The results were statistically analyzed using One-way ANOVA and Scheffe's post-hoc test at 95% confidencial level. RESULTS: There was no significant difference on flexural strength between groups. CONCLUSION: In the limitation of this study, flexural strength and flexural modulus of fiber post are not affected by airborne-particle abrasion.
Aluminum Oxide ; Resin Cements ; Silicon Dioxide

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Effect of fluoride-containing gel on the roughness of a titanium surface and the promotion of bacterial growth.

Sun Jin KIM ; Jae Kwan LEE ; Beom Seok CHANG ; Si Young LEE ; Heung Sik UM

Journal of Dental Rehabilitation and Applied Science.2016;32(1):16-23. doi:10.14368/jdras.2016.32.1.16

PURPOSE: The aim of this study was to evaluate whether fluorides at various pH cause changes in the surface roughness of titanium implants that alter the adherence of bacterial biofilms. MATERIALS AND METHODS: The titanium disks were assigned randomly to the following seven groups according to the fluoride agents and application time (1 minute or 30 minute) used: control (no treatment); group 1 (1.23% acidulated phosphate fluoride [APF] at pH 3.5 for 1 minute); group 2 (1.23% APF at pH 3.5 for 30 minute); group 3 (1.23% APF at pH 4.0 for 1 minute); group 4 (1.23% APF at pH 4.0 for 30 minute); group 5 (2% NaF gel at pH 7.0 for 1 minute); group 6 (2% NaF gel at pH 7.0 for 30 minute). The surface roughness of the titanium disks and the amount of adherent bacteria were measured. RESULTS: Group 2 showed a significantly greater surface roughness than the control group (P < 0.0001). No significant differences in the amount of surface bacteria were observed between the treated samples and the controls. In addition, there were no significant differences in bacterial adherence relative to the incubation period between the treated samples and the controls. CONCLUSION: The surface roughness of the titanium disks was significantly greater after treatment with APF at pH 3.5 for 30 min compared with that of the controls. In addition, we found that the amount of Porphyromonas gingivalis, Fusobacterium nucleatum, and Aggregatibactor actinomycetemcomitans was similar among all groups.
Acidulated Phosphate Fluoride ; Bacteria ; Bacterial Adhesion ; Biofilms ; Fluorides ; Fusobacterium nucleatum ; Hydrogen-Ion Concentration ; Porphyromonas gingivalis ; Titanium*

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A study on the difference analysis between an ideal and a clinical shape in case of manufacturing a metal-ceramic pontic substructure.

Wook Tae KIM ; Su Yeon IM

Journal of Dental Rehabilitation and Applied Science.2016;32(1):8-15. doi:10.14368/jdras.2016.32.1.8

PURPOSE: The purpose of this research is to determine whether pontic metal substructures, which are currently used in clinical surgeries, are designed appropriately and identify the problems that can occur due to their shape, size, and position. Then it aimed to emphasize the importance of making and designing pontic metal substructures based on basic principles. MATERIALS AND METHODS: This research measured pontic basal surface (P1) used sample metal substructures in this study, gingiva margin (P2), and the porcelain thickness of maximum infrabulge of labial surface around 1/3 of cervix dentis (P3). One-way ANOVA analysis was carried out to test the differences among groups, Tukey Honestly Significant Difference Test was conducted for statistical analysis among groups. RESULTS: For porcelain thickness and SD value, the P1 part was 1.2 - 1.8 (±0.17) mm for experimental group 1, 1.2 - 1.7 (±0.17) mm for experimental group 2, and 0.4 - 2.8 (±0.92) mm for experimental group 3. Next, the P2 part was 1.4 - 1.6 (±0.07) mm for experimental group 1, 1.3 - 1.8 (±0.07) mm for experimental group 2, and 0.5 - 2.7 (±0.67) mm for experimental group 3. The P3 part was 1.4 - 1.7 (±0.10) mm for experimental group 1, 1.5 - 2 (±0.10) mm for experimental group 2, and 0.9 - 3.1 mm (±0.90) for experimental group 3. There was no significance when One-way ANOVA analysis/Tukey Honestly Significant Difference Test was conducted for statistical analysis among groups (P > 0.05). CONCLUSION: The suggested metal substructures can be used clinically as they meet the requirements that pontic must have.
Dental Porcelain ; Denture, Partial, Fixed* ; Gingiva ; Tooth Cervix

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