The Relationship between Root-Crown Ratio of First Molar's Teeth with Trauma from Occlusion
Root-crown ratio is an important feature in the prognosis of teeth. The unbalanced root-crown ratio can be a factor of trauma from occlusion, which diagnosed subjectively through the radiographic examination. This study was conducted to confirm the subjective assessment into objective assessment. Th...
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Published in | Journal of International Dental & Medical Research Vol. 10; no. 2; pp. 265 - 269 |
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Main Authors | , , |
Format | Journal Article |
Language | English |
Published |
Diyarbakir
Ectodermal Dysplasia Group-Turkey
01.07.2017
Ectodermal Dysplasia Group - Turkey |
Subjects | |
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Abstract | Root-crown ratio is an important feature in the prognosis of teeth. The unbalanced root-crown ratio can be a factor of trauma from occlusion, which diagnosed subjectively through the radiographic examination. This study was conducted to confirm the subjective assessment into objective assessment. The aim of this study was to determine the clinical root-crown ratio of first molar which cause trauma from occlusion. Measurement root-crown ratio using method of Lind and its modifications to measure the decrease in alveolar bone height. The mean of clinical root-crown ratio for maxillary first molar is 0.814±0.308, and for mandibular first molar is 0.741±0.295. There are four categories of clinical root-crown ratio based on ROC curve test, which are: ratio >1.51=good; 1-≤1.50= pretty good; 0.51- 0.99= poor; ≤0.50= very bad. Significant result of the correlation between clinical root-crown ratio with: gingival recession (rs:- 0.221 on mesial, -0.266 on buccal and -0.179 on lingual/palatal); loss of attachment (rs:-0.340 on mesial, -0.427 on buccal, -0.295 on distal and -0.382 on lingual/palatal); tooth mobility (rs:-0.358) and the thickening of lamina dura (-0.252). There is a relationship between clinical root-crown ratio of maxillary and mandibular first molar with trauma from occlusion that aggravated periodontitis. |
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AbstractList | Root-crown ratio is an important feature in the prognosis of teeth. The unbalanced root-crown ratio can be a factor of trauma from occlusion, which diagnosed subjectively through the radiographic examination. This study was conducted to confirm the subjective assessment into objective assessment. The aim of this study was to determine the clinical root-crown ratio of first molar which cause trauma from occlusion. Measurement root-crown ratio using method of Lind and its modifications to measure the decrease in alveolar bone height. The mean of clinical root-crown ratio for maxillary first molar is 0.814±0.308, and for mandibular first molar is 0.741±0.295. There are four categories of clinical root-crown ratio based on ROC curve test, which are: ratio >1.51=good; 1-≤1.50= pretty good; 0.51- 0.99= poor; ≤0.50= very bad. Significant result of the correlation between clinical root-crown ratio with: gingival recession (rs:- 0.221 on mesial, -0.266 on buccal and -0.179 on lingual/palatal); loss of attachment (rs:-0.340 on mesial, -0.427 on buccal, -0.295 on distal and -0.382 on lingual/palatal); tooth mobility (rs:-0.358) and the thickening of lamina dura (-0.252). There is a relationship between clinical root-crown ratio of maxillary and mandibular first molar with trauma from occlusion that aggravated periodontitis. Received date: 28 September 2016_Accept date: 29 October 2016 Introduction Periodontitis can be aggravated by trauma from occlusion caused by poor root-crown ratio and it's included in secondary trauma from occlusion.1 The periodontal tissue adaptive capacity to withstand occlusal forces becomes less, and led to a decrease of attachment areas so it will increase the vulnerability of the remaining tissue to get injure.2,3 Traumatic occlusion can cause damage to the bone, periodontal ligament, and the root. Measurement of bone loss and the root-crown ratio with panoramic radiograph cannot accurate as periapical radiographs.8 Othman et al.7 in his research, wrote that according to Asgarifar (2001) determination of cement-enamel junction (CEJ) to distinguish the root and the crown of the tooth, on the panoramic radiographs are not so clear. Besides the difficulties of using the panoramic radiograph is on identify the reference points of the occlusal plane and the tip of root, it will increase the misidentification landmark. [...]the radiographic evaluation of the root-crown ratio should be use the periapical radiographs.8 Prosthodontic view of root-crown ratio has been always associated with the ability of the tooth to be an abutment, which ideally the ratio between crown and root is 1:2. Increasing the width of the periodontal space, often accompanied with a thickening of the lamina dura.10 Widening of the periodontal space can also be seen on mobile teeth, although not accompanied with vertical or angular bone resorption and without an increase in pocket depth.3,15 Conclusions The poor or unfavorable relationship between root-crown ratio of first molar's teeth can cause trauma from occlusion that aggravate periodontal disease. |
Author | Robert Lessang Sri Lelyati C Masulili Wita Anggraini |
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Snippet | Root-crown ratio is an important feature in the prognosis of teeth. The unbalanced root-crown ratio can be a factor of trauma from occlusion, which diagnosed... Received date: 28 September 2016_Accept date: 29 October 2016 Introduction Periodontitis can be aggravated by trauma from occlusion caused by poor root-crown... |
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SubjectTerms | Dental cement Dental crowns Dental enamel Dentistry Ligaments Medical prognosis Medical records Occlusion Orthodontics Periodontics Root resorption Teeth Trauma |
Title | The Relationship between Root-Crown Ratio of First Molar's Teeth with Trauma from Occlusion |
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