• The Journal of Advanced Prosthodontics
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• v.16 no.1
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• pp.1-11
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• 2024

PURPOSE. The present experiment aimed to evaluate the placement accuracy of fully guided implant surgery using a mucosa-supported surgical guide when the protocol of osteotomy and installation was modified (MP) compared to when the protocol was sequentially and conventionally carried out (CP). MATERIALS AND METHODS. For 24 mandibular dentiform models, 12 dentists (6 experts and 6 beginners) performed fully guided implant placements two times at the right first and second molar sites using a mucosa-supported surgical guide, once by the CP (CP group) and at the other time by the MP (MP group). The presurgical and postsurgical stereolithographic images were superimposed, and the deviations between the virtually planned and actually placed implant positions and the procedure time were compared statistically (P < .05). RESULTS. The accuracies were similar in the CP and MP groups. In the CP group, the mean platform and apex deviations at the second molar site for the beginners were +0.75 mm and +1.14 mm, respectively, which were significantly larger than those for the experts (P < .05). In the MP group, only the mean vertical deviation at the second molar site for the beginners (+0.53 mm) was significantly larger than that for the experts (P < .05). The procedure time was significantly longer for the MP group (+94.0 sec) than for the CP group (P < .05). CONCLUSION. In fully guided implant surgery using a mucosa-supported guide, the MP may improve the placement accuracy when compared to the CP, especially at sites farther from the most-posterior natural tooth.

• Journal of Photoscience
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• v.3 no.1
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• pp.39-42
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• 1996

The photochemical reaction of phenyl(tribromomethyl)mercury with nido-decaborane gives a new boron cluster expanded compound. The two borons at the 6- and 9- positions in decaborane behave as electrophilic centers for the reaction with dibromocarbene. The first step in this reaction is the addition of two molar equivalents of dibromocarbene which is produced from phenyl(tribromomethyl)mercury to nido-decaborane. In the second step the unstable intermediate generates the product, 1,2-$Br_2C_2B_{10}H_{10}$ through loss of H$_2$.

• Journal of Periodontal and Implant Science
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• v.19 no.2
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• pp.134.2-134.2
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• 1989

• Journal of the korean academy of Pediatric Dentistry
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• v.8 no.1
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• pp.21-24
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• 1981

The author observed a case of ectopic erupted maxillary second premolars and impacted mandibular second premolars due to premature loss of the primary second molars. The treatments were done as follows: 1. In the maxilla, the teeth arrangement problem was corrected with removal of the ectopic erupted second premolars. 2. In the mandible, normal dentition was established with surgical removal of the left second premolar and removal of the permanent first molar in right side combined by orthodontic therapy.

• The Journal of the Korean dental association
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• v.4 no.1
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• pp.37-39
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• 1963

The macroscopical and histological findings on a rare of malformed teeth occured in the left first Molar of upper jaw of the sixteen years old boy who is examined at the dental clinic of Soodo medical college are summerized as follows. 1.Occulusal surfare of the malformed teeth formed as circumvallated hard tissue wall and root are hypertrophical type. 2. The tissue of malformed teeth occured dystrophy of calcication distavance.

• The Journal of the Korean dental association
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• v.17 no.1 s.116
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• pp.53-57
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• 1979

This is a case of the patient, a 30-year-old woman, presented a necrotic osteomyelitis due to misusage of the arsenic trioxide for devitalization of the lower left first and second molars. She was obtained good satisfactory results by sequestrectomy of necrotic bone.

• The Journal of the Korean dental association
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• v.13 no.12
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• pp.1135-1139
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• 1975

A boy aged 13 years 5 months, had a Angle's clss I malocclusion characterized by severe anterior crowding. Molar relationship was neutroclusion, incisor overbite was 4mm, incisor overjet was 3mm. The patient underwent extraction of four first premolars and was treated with a multi-banded light force system. On the process of the orthodontic treatment, the teeth, obtained functional occlusion. The result of treatment was very satisfactory; color, vitality and mobility were normal, periodontal condition was good and the cosmetic result was excellent.

• Journal of Periodontal and Implant Science
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• v.22 no.2
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• pp.210.2-210.2
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• 1992

• Journal of Oral Medicine and Pain
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• v.7 no.1
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• pp.41-46
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• 1982

The patient, 11 yeats old male was examined for routine oral health care. He had been hospitalized for treatment of nephritis. Hos physical condition os mental retarded & undergrowth state. In oral examination, notch on cutting edge and screw-driver shaped crown of maxillary central incisors, narrow crown and dwarfed & pinched occlusal surface of lower first molars and scars(rhagades) on the angle of the lip were shown. We diagnosed the above symptoms as dental defects of congenital syphilis; Huchinson's inscisors and mulberry molar.

• Journal of the korean academy of Pediatric Dentistry
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• v.30 no.3
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• pp.502-509
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• 2003

After 800 students of Chonbuk National University was examined, 86 people (male : 43, female : 43, mean age : 22.2 years old) was selected as a group of normal occlusion. From their gypsum cast, this conclusion was obtained. 1. Intra-observer measurement errors in buccolingual diameter, maxillary lateral incisors have somewhat bigger errors. In mesiodistal diameter, maxillary first molars and maxillary second molar have bigger numerical value. Mean errors of measurement are 0.051mm at buccolingual diameter of crown and 0.083mm at mesiodistal diameter. 2. Fluctuating asymmetry is 0.030 average in buccolingual diameter, and 0.037 average in mesiodistal diameter. Statistically there are no big differences. 3. Male has longer buccolingual diameter than female in every permanent teeth. Teeth which have statistical difference in buccolingual diameter are maxillary lateral incisor, maxillary canine, maxillary second molar, mandibular central incisor, mandibular canine, mandibular second premolar, and mandibular first molar. In mesiodistal diameter maxillary central incisor, maxillary canine, and mandibular first molar have statistically difference. 4. Tooth which has the biggest difference depending on gender is maxillary lateral incisor in buccolingual diameter and mandibular canine in mesiodistal diameter. 5. Both sexes have similar crown index. Male has bigger value of crown module measurement and crown area measurement in every tooth. Crown area considered as size of tooth from occlusal surface was bigger in male than in female statistically except some teeth, maxillary first premolar, mandibular lateral incisor, first premolar and second premolar.