1.Effect of shell thickness on fracture strength of single implant provisional crowns fabricated by indirect-direct technique using 3D printing
The Journal of Korean Academy of Prosthodontics 2024;62(4):253-261
Purpose:
. This study aimed to evaluate the effect of shell thickness on the fracture strength of provisional crowns fabricated by indirect-direct technique. Materials and methods. The study simulated the application of a provisional crown on a maxillary first molar implant abutment. A titanium metal die was milled by replicating a ready-made implant abutment. Using CAD software, shells for provisional crown was designed with varying thicknesses of 0.5 mm, 1.0 mm and 1.5 mm with different internal spaces for relining. These shells were 3D printed using photosensitive liquid resin and relined with PMMA resin to fabricate provisional crown specimens using indirect-direct technique. Ten specimens per each group were prepared. Fracture strength was measured by applying compressive loads vertically to the occlusal center of the specimens at a crosshead speed of 1.0 mm/min using a universal testing machine, and the maximum load value (N) at fracture was recorded. To compare the fracture strength between experimental groups, a one-way ANOVA followed by Tukey’s post hoc test was conducted (α=.05).
Results
. The fracture strength was observed in the following order: Group 1.5(1504.5 ± 141.30 N), Group 1.0 (1420.2 ± 182.05 N), and Group 0.5 (1083.1 ± 178.90 N). Group 1.5 was not significantly different from group 1.0, but was significantly different from group 0.5, and group 1.0 was also significantly different from group 0.5. Conclusion. The fracture strength of provisional crowns fabricated by the indirect-direct techniques were significantly different depending on the thickness of the shell. The fracture strength of the indirect-direct method was significantly lower when the shell thickness was 0.5 mm compared to 1.0 mm and 1.5mm. This finding indicates that the shell should not be too thin when fabricating provisional crowns using the indirect-direct technique.
2.Effect of shell thickness on fracture strength of single implant provisional crowns fabricated by indirect-direct technique using 3D printing
The Journal of Korean Academy of Prosthodontics 2024;62(4):253-261
Purpose:
. This study aimed to evaluate the effect of shell thickness on the fracture strength of provisional crowns fabricated by indirect-direct technique. Materials and methods. The study simulated the application of a provisional crown on a maxillary first molar implant abutment. A titanium metal die was milled by replicating a ready-made implant abutment. Using CAD software, shells for provisional crown was designed with varying thicknesses of 0.5 mm, 1.0 mm and 1.5 mm with different internal spaces for relining. These shells were 3D printed using photosensitive liquid resin and relined with PMMA resin to fabricate provisional crown specimens using indirect-direct technique. Ten specimens per each group were prepared. Fracture strength was measured by applying compressive loads vertically to the occlusal center of the specimens at a crosshead speed of 1.0 mm/min using a universal testing machine, and the maximum load value (N) at fracture was recorded. To compare the fracture strength between experimental groups, a one-way ANOVA followed by Tukey’s post hoc test was conducted (α=.05).
Results
. The fracture strength was observed in the following order: Group 1.5(1504.5 ± 141.30 N), Group 1.0 (1420.2 ± 182.05 N), and Group 0.5 (1083.1 ± 178.90 N). Group 1.5 was not significantly different from group 1.0, but was significantly different from group 0.5, and group 1.0 was also significantly different from group 0.5. Conclusion. The fracture strength of provisional crowns fabricated by the indirect-direct techniques were significantly different depending on the thickness of the shell. The fracture strength of the indirect-direct method was significantly lower when the shell thickness was 0.5 mm compared to 1.0 mm and 1.5mm. This finding indicates that the shell should not be too thin when fabricating provisional crowns using the indirect-direct technique.
3.Effect of shell thickness on fracture strength of single implant provisional crowns fabricated by indirect-direct technique using 3D printing
The Journal of Korean Academy of Prosthodontics 2024;62(4):253-261
Purpose:
. This study aimed to evaluate the effect of shell thickness on the fracture strength of provisional crowns fabricated by indirect-direct technique. Materials and methods. The study simulated the application of a provisional crown on a maxillary first molar implant abutment. A titanium metal die was milled by replicating a ready-made implant abutment. Using CAD software, shells for provisional crown was designed with varying thicknesses of 0.5 mm, 1.0 mm and 1.5 mm with different internal spaces for relining. These shells were 3D printed using photosensitive liquid resin and relined with PMMA resin to fabricate provisional crown specimens using indirect-direct technique. Ten specimens per each group were prepared. Fracture strength was measured by applying compressive loads vertically to the occlusal center of the specimens at a crosshead speed of 1.0 mm/min using a universal testing machine, and the maximum load value (N) at fracture was recorded. To compare the fracture strength between experimental groups, a one-way ANOVA followed by Tukey’s post hoc test was conducted (α=.05).
Results
. The fracture strength was observed in the following order: Group 1.5(1504.5 ± 141.30 N), Group 1.0 (1420.2 ± 182.05 N), and Group 0.5 (1083.1 ± 178.90 N). Group 1.5 was not significantly different from group 1.0, but was significantly different from group 0.5, and group 1.0 was also significantly different from group 0.5. Conclusion. The fracture strength of provisional crowns fabricated by the indirect-direct techniques were significantly different depending on the thickness of the shell. The fracture strength of the indirect-direct method was significantly lower when the shell thickness was 0.5 mm compared to 1.0 mm and 1.5mm. This finding indicates that the shell should not be too thin when fabricating provisional crowns using the indirect-direct technique.
4.Effect of shell thickness on fracture strength of single implant provisional crowns fabricated by indirect-direct technique using 3D printing
The Journal of Korean Academy of Prosthodontics 2024;62(4):253-261
Purpose:
. This study aimed to evaluate the effect of shell thickness on the fracture strength of provisional crowns fabricated by indirect-direct technique. Materials and methods. The study simulated the application of a provisional crown on a maxillary first molar implant abutment. A titanium metal die was milled by replicating a ready-made implant abutment. Using CAD software, shells for provisional crown was designed with varying thicknesses of 0.5 mm, 1.0 mm and 1.5 mm with different internal spaces for relining. These shells were 3D printed using photosensitive liquid resin and relined with PMMA resin to fabricate provisional crown specimens using indirect-direct technique. Ten specimens per each group were prepared. Fracture strength was measured by applying compressive loads vertically to the occlusal center of the specimens at a crosshead speed of 1.0 mm/min using a universal testing machine, and the maximum load value (N) at fracture was recorded. To compare the fracture strength between experimental groups, a one-way ANOVA followed by Tukey’s post hoc test was conducted (α=.05).
Results
. The fracture strength was observed in the following order: Group 1.5(1504.5 ± 141.30 N), Group 1.0 (1420.2 ± 182.05 N), and Group 0.5 (1083.1 ± 178.90 N). Group 1.5 was not significantly different from group 1.0, but was significantly different from group 0.5, and group 1.0 was also significantly different from group 0.5. Conclusion. The fracture strength of provisional crowns fabricated by the indirect-direct techniques were significantly different depending on the thickness of the shell. The fracture strength of the indirect-direct method was significantly lower when the shell thickness was 0.5 mm compared to 1.0 mm and 1.5mm. This finding indicates that the shell should not be too thin when fabricating provisional crowns using the indirect-direct technique.
5.Effect of shell thickness on fracture strength of single implant provisional crowns fabricated by indirect-direct technique using 3D printing
The Journal of Korean Academy of Prosthodontics 2024;62(4):253-261
Purpose:
. This study aimed to evaluate the effect of shell thickness on the fracture strength of provisional crowns fabricated by indirect-direct technique. Materials and methods. The study simulated the application of a provisional crown on a maxillary first molar implant abutment. A titanium metal die was milled by replicating a ready-made implant abutment. Using CAD software, shells for provisional crown was designed with varying thicknesses of 0.5 mm, 1.0 mm and 1.5 mm with different internal spaces for relining. These shells were 3D printed using photosensitive liquid resin and relined with PMMA resin to fabricate provisional crown specimens using indirect-direct technique. Ten specimens per each group were prepared. Fracture strength was measured by applying compressive loads vertically to the occlusal center of the specimens at a crosshead speed of 1.0 mm/min using a universal testing machine, and the maximum load value (N) at fracture was recorded. To compare the fracture strength between experimental groups, a one-way ANOVA followed by Tukey’s post hoc test was conducted (α=.05).
Results
. The fracture strength was observed in the following order: Group 1.5(1504.5 ± 141.30 N), Group 1.0 (1420.2 ± 182.05 N), and Group 0.5 (1083.1 ± 178.90 N). Group 1.5 was not significantly different from group 1.0, but was significantly different from group 0.5, and group 1.0 was also significantly different from group 0.5. Conclusion. The fracture strength of provisional crowns fabricated by the indirect-direct techniques were significantly different depending on the thickness of the shell. The fracture strength of the indirect-direct method was significantly lower when the shell thickness was 0.5 mm compared to 1.0 mm and 1.5mm. This finding indicates that the shell should not be too thin when fabricating provisional crowns using the indirect-direct technique.
6.A Family of Hereditary Olivopontocerebellar Atrophy (Menzel type OPCA, OPCA III with retinal degeneration).
Seung Kil LIM ; Il Nam SEONWOO ; Ki Hwan KIM ; Oh Woong KWON ; Jung HO SEO
Journal of the Korean Neurological Association 1984;2(1):77-83
This is a case report of the familial olivo-ponto-cerebellar atrophy (Menzel type OPCA, OPCA III with retinal degeneration). The patient is a 37 year-old male with 5 years history of slowly progressive cerebellar ataxia, dysarthria, visual change, horizontal nystagmus and signs of pyramidal dysfunction. The CT brain scan shows significant atrophy of brain stem and cerebellum with dilatation of cisterns. His younger sister, also, has similar clinical manifestations and radiological abnormalities, but mild. By history, his mother who died at 47 years of her age looked like to have same kind of chronic disease.
Adult
;
Atrophy
;
Brain
;
Brain Stem
;
Cerebellar Ataxia
;
Cerebellum
;
Chronic Disease
;
Dilatation
;
Dysarthria
;
Humans
;
Male
;
Mothers
;
Nystagmus, Pathologic
;
Olivopontocerebellar Atrophies*
;
Retinaldehyde*
;
Siblings
7.Korean Acne Grading System.
Kyung Jeh SUNG ; Young Suck RHO ; Eung Ho CHOI ; Jeong Joon OH ; Joo Heung LEE ; Seonwoo KIM ; Nack In KIM
Korean Journal of Dermatology 2004;42(10):1241-1247
BACKGROUND: A good acne grading system should reflect epidemiological and clinical features of a particular patient group. Current Korean acne grading systems are mostly based on the skin colors, epidemiology, and clinical features of Western countries, which make them less than being ideal for Korean acne patients. OBJECTIVE: We tried to devise an acne grading system based on clinical and epidemiological characteristics of Korean acne patients. This system is intended for use in primary care setting as well as in research purposes. METHODS: In the formulation of a new acne grading system, a panel of 5 dermatologists from 5 referral centers took into account the degree of complexity of the system, criteria for severity as well as skin colors through the review of clinical photographs of 250 acne patients. The new grading system then underwent inter-rater and intra-rater discrepancy assessment and simulation with 149 patient photos to find out an optimal epidemiological representation. RESULTS: We developed 6-scale grading system with both standard pictures and ranges of number of lesions as criteria. Intra-rater and inter-rater reproducibility turned out to be moderate to strong, suggesting clear instruction and easy performance. Simulation with 4 different models yielded best parameter ranges for the optimal criteria. CONCLUSIONS: With the feedback from the large-scale field applications, this new acne grading system will serve as a multipurpose acne grading system for Korean patients.
Acne Vulgaris*
;
Epidemiology
;
Humans
;
Primary Health Care
;
Referral and Consultation
;
Skin
8.The Effect of Hippotherapy and Medication on Children with Attention Deficit Hyperactivity Disorder: A Pilot Study.
Jihye SONG ; Byongsu JANG ; Jiwon KIM ; Jiyoung LEE ; Hye Yeon SHIN ; Yunhye OH ; Kounseok LEE ; Seonwoo KIM ; Yun Hee KIM ; Jeong Yi KWON ; Yoo Sook JOUNG
Journal of Korean Neuropsychiatric Association 2015;54(1):112-118
OBJECTIVES: This study researched the clinical effects of hippotherapy and medication in attention deficit hyperactivity disorder (ADHD) children. METHODS: The study employed an open label randomized controlled trial. Participants were 10 children of ages between 6 and 12 years. These subjects were placed in 2 groups : the hippotherapy group and the medication group. Evaluation tools used in this study include Affective Disorders and Schizophrenia-Present and Lifetime Version- Korean Version, the Wechsler Intelligence Scale for Children-IV, Korean Child Behavior Check List (K-CBCL), ADHD rating scale (ARS), Clinical Global Impression (CGI), and Quantitative electroencephalography (QEEG). RESULTS: Grossly scores of investigator-administered ADHD rating scale (ARS-I), K-CBCL, and CGI-Severity of Illness scale were improved in both the hippotherapy and the medication group. The ARS-I scores of the Hippotherapy group were not significantly different from baseline after 12 weeks. In the QEEG, theta/beta ratio of Pz area in the hippotherapy group was significantly different from baseline. Children treated with medication showed significant difference from baseline in ARS-I, K-CBCL subscales, and QEEG. CONCLUSION: The use of hippotherapy could be a viable treatment strategy as a part of a multimodal therapy for children with ADHD. This pilot study provides good prospects for future studies to document these positive trends on larger samples.
Attention Deficit Disorder with Hyperactivity*
;
Child Behavior
;
Child*
;
Electroencephalography
;
Equine-Assisted Therapy*
;
Humans
;
Intelligence
;
Mood Disorders
;
Pilot Projects*
9.Psychopathologic Profiles and Clusters in Tertiary Clinic Referred Patients with Adult Attention Deficit Hyperactivity Disorder: A Person-Centered Analysis
Yunhye OH ; Hyewon PARK ; Seonwoo KIM ; Hye Seung KIM ; Yoo-Sook JOUNG ; Kyung Sue HONG ; Ji Hyun BAEK
Psychiatry Investigation 2021;18(4):304-311
Objective:
Adult attention deficit hyperactivity disorder (ADHD) has a heterogeneous clinical presentation with patients showing very frequent emotional problems. In the present study, patients with adult ADHD were subtyped based on their psychopathology using a person-centered approach.
Methods:
In the present chart review study, detailed findings of psychological evaluation conducted as part of routine care were utilized. A total of 77 subjects with adult ADHD were included in the analysis. Detailed ADHD symptoms, psychiatric comorbid Diagnostic and Statistical Manual of Mental Disorders (DSM) diagnoses, and severity of mood and anxiety symptoms were evaluated in the person-centered analysis.
Results:
Three clusters were generated using clustering analysis. DSM comorbid conditions did not significantly impact the clustering. Cluster 1 consisted of ADHD combined presentation (ADHD-C) with less mood symptoms, cluster 2 of ADHD predominantly inattentive presentation and cluster 3 of ADHD-C with significant mood symptoms. Patients in cluster 3 had adulthood functional impairment more frequently compared with patients in cluster 1. Patients in cluster 3 showed recurrent thoughts of death and suicidal ideation more frequently compared with patients in cluster 1.
Conclusion
Further studies are needed to confirm the relationships observed in the present study.
10.Psychopathologic Profiles and Clusters in Tertiary Clinic Referred Patients with Adult Attention Deficit Hyperactivity Disorder: A Person-Centered Analysis
Yunhye OH ; Hyewon PARK ; Seonwoo KIM ; Hye Seung KIM ; Yoo-Sook JOUNG ; Kyung Sue HONG ; Ji Hyun BAEK
Psychiatry Investigation 2021;18(6):591-591