Biometric study of the width, length and depth of the root trunk groove of human lower second molars

Abstract

. E.; ROMITO, G. A. Biometric study of the width, length and depth of the root trunk groove of human lower second molars. Pesqui Odontol Bras, v. 16, n. 1, p. 26-30, jan./mar. 2002. One hundred human lower second molars, 51 from the left side and 49 from the right side, extracted due to their poor clinical and radiographic conditions were utilized in this study. Using a Contracer apparatus, the profiles of the buccal and lingual root surfaces of these teeth were traced on a millimeter-scaled paper. The profiles were registered from the cementoenamel junction (CEJ), millimeter by millimeter, up to the entrance of the furcation. The width, length and depth of the root trunk groove, as well as the length of the root trunk, were studied. After statistical analysis (p < 0.05) it was possible to conclude that: a) the mean width of the root trunk groove on the buccal surface was 3.6 mm and, on the lingual surface, 3.3 mm; b) the mean depth of the root trunk groove on the buccal surface was 0.88 mm and, on the lingual surface, 0.77 mm; c) the mean length of the root trunk groove on the buccal surface was 2.93 mm and, on the lingual surface, 3.61 mm. The mean length of the root trunk on the buccal surface was 3.09 mm and, on the lingual surface, 3.91 mm (p < 0.025). There was a coincidence between the length of the root trunk and that of its groove in 90.2% of the buccal surfaces of the samples from the left side, and in 77.5% of the samples from the right side; on the lingual surface, the coincidence occurred in 77.5% of the teeth from the left side, and on 88.3% of the teeth from the right side. This work revealed that there is a concavity on the root trunk region of the lower second molar, whose depth and width were greater on the buccal surface and whose length was greater on the lingual surface. The depth of the root trunk groove increased in the apical direction, with maximum depth in the last millimeter of the root trunk. The root trunk was longer on the lingual surface than it was on the buccal surface.

Mandibular skeletal posterior anatomic limit for molar distalization in patients with Class III malocclusion with different vertical facial patterns

“…Choi et al 13 reported an MPAL distance of 2.7 ± 2.8 mm at 6 mm apical to the furcation. The average length of the root trunk is 3 mm, 28 which is similar to the distance at 8-mm depth apical to the CEJ in this study, i.e., 3.16 ± 2.41 mm.…”

Effect of the use of different periodontal curettes on the topography and roughness of root surface

“…It is known that some tooth types have root concavities and others do not. The concavities make scaling difficult and provide a rougher and irregular surface [12,14], and this aspect was not taken into account in other studies [1,4,11,15].…”

“…The treatment for removing these from the root surface is the scaling and polishing of the root surface by hand, ultrasound, piezoelectric or high level laser instruments [1,3,15]. Although root scaling is the treatment most used, many studies verified that the complete removal of the dental calculus, plaque, and altered cementum from all root surface is not even reached [5,13], mainly in anatomic areas, as the proximal surfaces of the roots and furcal areas that demanding high skills [12,14]. During root decontamination, the instruments used for scaling may leave root surface more irregular and rougher.…”

1.2% Rosuvastatin and 1.2% Atorvastatin Gel Local Drug Delivery and Redelivery in the Treatment of Class II Furcation Defects: A Randomized Controlled Clinical Trial

“…Treatment of furcation lesions is one of the most demanding tasks in periodontal therapy today. Rate of success experienced in treatment of furcation lesions is low owing to incomplete removal of subgingival plaque and calculus in the interradicular area as a result of the complex anatomy of the furcation space 3 , 4 …”