The characteristics of Korean multi-rooted teeth root trunk extracted by periodontal disease / 대한치주과학회지

The purpose of this study was to investigate the characteristiss of korean multi-rooted teeth extracted by periodontal disease. A total of 182 extracted multi-rooted teeth were examined. The distance from the cementoenamel junction(CEJ) to the root groove and from the CEJ to the root division was measured. The frequency of the root grooves were calculated. The results are as follows : 1. Distances from CEJ to the root groove were 1.53, 1.60mm for maxillary first premolars mesial, distal sides, 1.26, 1.38, 1.75mm for maxillary first molars buccal, mesial, distal sides, 1.38, 1.71, 1.41mm for maxillary second molars buccal, mesial, distal sides, 0.98, 0.99mm for mandibular first molars buccal , lingual sides and 1.28, 1.35mm for mandibular second molars buccal, lingual sides. 2. The frequency of the root grooves were 17.4, 30.4% for maxillary first premolars mesial, distal sides, 44.4, 84.1, 67.5% for maxillary first molars buccal, mesial, distal sides, 100, 90.3, 90.3% for maxillary second molars buccal, mesial, distal sides, 42.9, 77.8% for mandibular first molars buccal, lingual sides and 90.6% for mandibular second molars buccal, lingual sides. 3. Distances from CEJ to the root division were 6.8, 7.2mm for maxillary first premolars mesial, distal sides, 3.3, 4.38, 4.34mm for maxillary first molars buccal, mesial, distal sides, 3.67, 4.8, 4.07mm for maxillary second molars buccal, mesial, distal sides, 3.1, 3.89mm for mandibular first molars buccal, lingual sides and 3.2, 4.06mm for mandibular second molars buccal, lingual sides.

The Location of Molar Furcation in Korean / 대한치주과학회지

The objective of the present study was to investigate the vertical and horizontal location of the molar furcations in korean. The samples used in this study included 132 maxillary molars and 120 mandibular molars. Of them, 47 maxillary molars and 34 mandibular molars had the fused roots. So, 85 maxillary molars(54 1st and 31 2nd molars) and 86 mandibular molars(46 1st and 40 2nd molars) were measured. The vertical and horizontal location of molars were measured with divider and digimatic micrometer and their means and standard deviation calculated. The results were summarized as follows: 1. The ratio of fused roots found in this study was the highest in the maxillary second molars with 59%, followed by mandibular second molars(46%) and maxillary first molars(7%) and none were discovered in the mandibular first molars. 2. In the study of the vertical location of molar furcation, the results were as follows : In the maxillary first molars, the length in descending order were distal(5.06mm), mesial(4.52mm) and buccal(4.01mm) and in the maxillary second molar, distal(4.04mm), mesial(4.02mm) and buccal(3.87mm). In the mandibular first molar, the length was 3.69mm on the lingual side and 2.81mm on the buccal side, and in the mandibular second molar, 3.87mm on the lingual and 3.61mm on the buccal side. 3. The location of the mesial and distal furcations in horizontal dimension measured showed following results : buccal and mesial furcations of the maxillary molars and buccal and lingual furcations of the mandibular molars generally found at the center, but the mesial furcation of the maxillary molars were found approximately two thirds toward the palatal aspect.