Reliability of Pederson Scale in Surgical Extraction of Impacted Lower Third Molars: Proposal of New Scale

Kharma, Mohamed Yaser; Sakka, Salah; Aws, Ghassan; Tarakji, Basel; Nassani, Mohammed Zakaria

doi:10.1155/2014/157523

Cited by 15 publications

(15 citation statements)

References 8 publications

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“…The evaluation of the difficulty of surgical removal of an impacted third molar in the mandible was performed using the Pederson index [ 22 , 23 ]. Based on the impaction according to Winter, the spatial position of the impacted teeth was defined as mesial-angular alignment, horizontal/reversed alignment, vertical alignment, and distal-angular alignment.…”

Section: Methodsmentioning

confidence: 99%

The Pattern of Mandibular Third Molar Impaction and Assessment of Surgery Difficulty: A Retrospective Study of Radiographs in East Baltic Population

Jaroń

Trybek

2021

IJERPH

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Classifications of impacted teeth allow defining the type and degree of retention, as well as assessing the degree of difficulty of the procedure. The aim of this study was to conduct retrospective analysis of the degree of retention and difficulty in the surgical removal of impacted mandibular third molars in the clinical material of the Department of Oral Surgery in 2013–2018. This study included 1585 dental panoramic radiographs of patients of the Department of Oral Surgery, who reported in 2013–2018, in order to perform surgical removal of the impacted mandibular third molar. Based on dental panoramic radiographs, the degree of retention was determined based on classifications according to Winter, according to Pell and Gregory, according to Tetsch and Wagner, and according to Asanami and Kasazaki. The difficulty of the procedure was also assessed based on the Pederson index. The most common types of lower wisdom tooth impaction are as follows: in Winter’s classification, mesial-angular impaction; in Tetsch and Wagner’s classification, oblique medial-angular impaction; in Pell and Gregory’s classification, impaction grade 2A; and in Asanami and Kasazaki’s classification, 3A and anterior inclination. In most cases of surgical removal of an impacted tooth, the anticipated difficulty of the procedure was rated as very difficult.

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Section: Methodsmentioning

confidence: 99%

The Pattern of Mandibular Third Molar Impaction and Assessment of Surgery Difficulty: A Retrospective Study of Radiographs in East Baltic Population

Jaroń

Trybek

2021

IJERPH

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“…In this study, the MPS was considered as a reference standard index of surgical difficulty as it found reliable and consistent with operative difficulty by researchers ( 1 , 7 , 8 , 12 ). The results of this study was in agreement with previous studies where the MPS was found significantly correlated with surgical time ( P =0.007).…”

Section: Discussionmentioning

confidence: 66%

“…Kharma scale proposed a new difficulty prediction index based on 4 factors: tooth angulation, the depth of the third molar in the mandible, the relationship with the ramus/space available, and root form ( 7 ). It is similar to Pederson index in that it measures the same parameters in addition to root forms, and close to Yuasa scale ( 3 ) as the former assess the same parameters in addition to tooth angulation.…”

Section: Discussionmentioning

confidence: 99%

“…Recently, Kharma et al ( 7 ) proposed a new scale; which is a modification of Pederson scale; that took into account the anatomical form of the tooth roots. They claimed that this new estimating index is more reliable and accurate than Pederson scale, and significantly correlated with postoperative difficulty rated by modified Parant scale ( 7 ).…”

Section: Introductionmentioning

confidence: 99%

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Evaluation of Kharma scale as a predictor of lower third molar extraction difficulty

Al-Samman¹

2017

Med Oral

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BackgroundThe Evaluation of the degree of lower third molar (L3M) extraction difficulty is extremely important for both clinicians and patients. This study aimed to evaluate the validity of a new index (Kharma scale) as a preoperative predictor index of the difficulty of surgical removal of impacted L3M.Material and MethodsExtraction difficulty of a series of 49-impacted L3M was predicted preoperatively by Kharma scale, and postoperative difficulty was assessed with a modified Parant scale.ResultsThe sensitivity of Kharma scale, as a predictor of difficulty, was 18.2% and the specificity was 68.4%. Likelihood ratios for the Kharma categories also indicated that the scale is of little value for predicting a difficult extraction. There was no significant association between the Kharma score and duration of operation, but high-modified Parant scores were significantly associated with longer operations.ConclusionsThe proposed Kharma scale was unreliable as preoperative predictor of the L3M extraction difficulty, and both radiological and clinical information must be taken into account. Key words:Kharma scale, prediction scale, lower third molar, extraction difficulty.

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“…Third molar surgery is one of the treatments most performed by dentists in daily practice (5,6,11,21). Therefore, various authors agree that this type of surgery should be carried out by qualified professionals, should be evaluated prior upon execution, in order to experience minimal pre-, intra-, and post-operative complications (11,14,18,26,27). This has generated the need to evaluate scales that allow predicting the difficulty that a third molar extraction may have due to the proximity to important anatomical structures (9,10).…”

Section: Discussionmentioning

confidence: 99%

Predictive Factors to Assess the Difficulty to Extract Retained Lower Third Molars

2020

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Background: Third molar eruption occurs in a very limited space. Several difficulty scales have been used to determine the complexity when extracting retained molars, which are key for surgical planning and prediction. A scale including indicators such as quality of mucosa and bone, as well as shape and number of roots is introduced. Purpose: Evaluate the difficulty in extracting retained lower third molars, using the scale proposed by Romero-Ruiz, and thus estimate the presence of intraoperative complications and surgical time. Methods: An observational descriptive cross-sectional study was carried out, with a sample of 100 extractions of retained lower third molars in patients between 16 and 40 years of age. The following variables were evaluated: spatial relationship, depth, relationship with mandible ramus/space, integrity of bone and mucosa, roots, dental follicle, and surgical time. The data were summarized in absolute frequency tables and analyzed with Pearson's Chi2 test (p < 0.05). Results: 71 % of third molars were classified as “difficult” on the scale. There were significant differences in terms of surgical time-age (p = 0.002), presence of complications-location of the third molar (p = 0.015), presence of complications-follicle size (p = 0.022), difficulty-sex (p = 0.011 ), difficulty-age (p = 0.068). Conclusions: This scale can be used to plan extraction treatments for retained lower third molars to reduce surgical times and anticipate complications.

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Reliability of Pederson Scale in Surgical Extraction of Impacted Lower Third Molars: Proposal of New Scale

Cited by 15 publications

References 8 publications

The Pattern of Mandibular Third Molar Impaction and Assessment of Surgery Difficulty: A Retrospective Study of Radiographs in East Baltic Population

The Pattern of Mandibular Third Molar Impaction and Assessment of Surgery Difficulty: A Retrospective Study of Radiographs in East Baltic Population

Evaluation of Kharma scale as a predictor of lower third molar extraction difficulty

Predictive Factors to Assess the Difficulty to Extract Retained Lower Third Molars

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