O.352 Pederson index is an unreliable instrument for predicting the difficulty of mandibular third molars

Akadiri, OA; Ae, Obiechina; Ao, Fasola; Okoje, Victoria N.

doi:10.1016/s1010-5182(06)60377-6

Cited by 10 publications

(12 citation statements)

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“…However, the operator should investigate the relation to the second molar, relation to the mandibular canal, root form, and ankylosis in order to distinguish very difficult cases when the index score is high. This confirms the study of Akadiri et al6, which posited that the Pederson index should not be employed as a sole instrument for preoperative assessment of difficulty in third molar surgery.…”

Section: Discussionsupporting

confidence: 88%

“…The Pederson index predicts surgical extraction difficulty using both Pell-Gregory classification and Winter's classification. Unlike Pell-Gregory classification, the Pederson index4 includes angulation factor, although some studies and analyses have concluded that it is not a reliable test for predicting surgical difficulty of third molar surgery and should not be employed as a sole instrument for preoperative assessment of difficulty456.…”

Section: Introductionmentioning

confidence: 99%

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Which factors are associated with difficult surgical extraction of impacted lower third molars?

Park

2016

J Korean Assoc Oral Maxillofac Surg

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ObjectivesThe aim of this retrospective study was to investigate factors associated with increased difficulty in the surgical extraction of impacted lower third molars and to improve identification of difficult cases.Materials and MethodsA total of 680 patients who required 762 surgical extractions of impacted lower third molars from 2009 to 2014 were enrolled in the study. Demographic factors, clinical factors, radiographic factors, surgical extraction difficulty, and presumed causes of difficulty were collected. Data were statistically analyzed using IBM SPSS Statistics version 23.ResultsAge, sex, depth of impaction, and blurred radiographic image influenced difficulty in surgical extraction. The position of the impacted tooth influenced surgical difficulty, especially when it was accompanied by other factors.ConclusionIt is challenging to design a reliable and practical instrument to predict difficulty in surgical extraction of impacted lower third molars. To identify very difficult cases, root investigation using computed tomography is advised when impacted tooth position suggests difficult extraction.

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Section: Discussionsupporting

confidence: 88%

Section: Introductionmentioning

confidence: 99%

Which factors are associated with difficult surgical extraction of impacted lower third molars?

Park

2016

J Korean Assoc Oral Maxillofac Surg

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“…In the fourth study, Pederson index was used to predict the difficulty of 79 cases of impacted mandibular third molar [14]. The index was found to be highly reproducible (p = 0.00).…”

Section: Resultsmentioning

confidence: 99%

“…Out of remaining 2 studies, one study compared the Pederson index with the Parant index and concluded that Pederson index has very low predictive value [11]. Fourth study evaluated the Pederson index in 79 patients and concluded that Pederson index has low accuracy and was not a reliable index to assess the difficulty of the impacted mandibular third molar surgery [14]. Likelihood ratio was calculated with the help of sensitivity and specificity of the Pederson index.…”

Section: Discussionmentioning

confidence: 99%

Is Pederson Index a True Predictive Difficulty Index for Impacted Mandibular Third Molar Surgery? A Meta-analysis

Bali¹,

Bali

Sharma³

et al. 2012

J. Maxillofac. Oral Surg.

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The aim of this meta-analysis was to find out the clinical reliability of Pederson index in assessing the difficulty of surgery for impacted mandibular 3rd molar. The relevant articles were selected by Hand search and electronic media (Medline, Pubmed, Embase Cochrane library, ISI web of science) from Jan 2000 to Dec 2010. All the relevant articles were properly screened and findings were extracted from the articles. Pederson index had shown low sensitivity and specificity in predicting the difficulty of surgery for impacted mandibular 3rd molar. Positive and negative likelihood ratio had also shown the unreliability of Pederson index. The meta-analysis of the current literature concluded that Pederson index is not a reliable test to predict the surgical difficulty of impacted mandibular 3rd molar.

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“…The Pederson scale is widely cited in oral and maxillofacial surgical texts as a useful way of predicting the difficulty of extraction of impacted lower third. However, this method has recently been found to be inadequate for the determination of surgical difficulty [14]. Edwards et al [8] corroborated this by reporting that it is difficult to estimate actual surgical difficulty by radiologic assessment alone.…”

Section: Discussionmentioning

confidence: 99%

Importance of Clinical and Radiological Parameters in Assessment of Surgical Difficulty in Removal of Impacted Mandibular 3rd Molars: A New Index

Roy

Baliga

Louis

et al. 2014

J. Maxillofac. Oral Surg.

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Objective The aim of the study is to assess the clinical and radiological factors that increase the surgical difficulty in removal of mandibular impacted 3rd molar and design a new difficulty predictive index. Methods The data was collected from 100 patients with impacted mandibular 3rd molar who presented to Department of Oral and Maxillofacial Surgery, K.L.E's Institute of Dental Sciences. Clinical and radiological parameters included in the New Index were noted. The tooth was then removed under local anesthesia and time taken for the removal was noted. The Pederson Index, New Index and time taken were co-related using kappa statistical analysis. Results The kappa agreement between Pederson Index and time taken was 66.50 % (0.2231) whereas between New Index and time was 89 % (0.7177) indicating that New Index is a better predictor of the difficulty. Conclusion The New Index is a reliable tool in predicting the difficulty in the removal of mandibular impacted third molar.

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O.352 Pederson index is an unreliable instrument for predicting the difficulty of mandibular third molars

Cited by 10 publications

References 0 publications

Which factors are associated with difficult surgical extraction of impacted lower third molars?

Which factors are associated with difficult surgical extraction of impacted lower third molars?

Is Pederson Index a True Predictive Difficulty Index for Impacted Mandibular Third Molar Surgery? A Meta-analysis

Importance of Clinical and Radiological Parameters in Assessment of Surgical Difficulty in Removal of Impacted Mandibular 3rd Molars: A New Index

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