Association between Pell and Gregory classification and the difficulty of the extraction of the lower third parties

SOUZA JUNIOR, Erasmo Freitas de; SILVA, Janielma Azevedo; BRITO, José Iago Pereira de; LUCENA, Eudes Euler de Souza; MORAIS, Hecio Henrique Araújo de

doi:10.1590/1981-86372021002120190101

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ORIGINAL • Rev Gaúch. Odontol. 69 • 2021 • https://doi.org/10.1590/1981-86372021002120190101 copy

Association between Pell and Gregory classification and the difficulty of the extraction of the lower third parties

Associação entre a classificação de Pell e Gregory e a dificuldade da extração dos terceiros molares inferiores

Authorship SCIMAGO INSTITUTIONS RANKINGS

ABSTRACT

Lower third molar extraction is a common procedure in Oral and Maxillofacial Surgeons routine. However, even though this procedure is frequent, sometimes its course is unexpected. In this scenario, some developed classifications help to predict the difficulty level for such extractions.

Objective

This study aimed to verify the association of Pell and Gregory classifications I and II and surgical difficulty through lower third molar extractions.

Methods

Voluntary patients from the Dentistry Course of the State University of Rio Grande do Norte, between 16 and 45 years of age, who met the inclusion criteria, had their third molars classified according to Pell and Gregory.

Results

A total of 42 elements were extracted. There were no statistically significant differences for the correlation of Pell and Gregory classification with the surgical difficulty considering the variables such as surgery time (p=0.419), osteotomy needs (p=0.428) and number of anesthetic tubes (0.939). As for the need for odontosection, only when comparing the teeth classified as AI and IIA, the difference in favor of AI elements was statistically significant (p=0.008). There were no accidents or complications.

Conclusions

Pell and Gregory classification was not a good predictor of surgical difficulty, and further studies on this subject are recommended.

Indexing terms
Molar, third; Tooth extraction; Mandible

Patient characteristics
Patients gender
			Percentage
	Male			4.8%
	Female			95.2%
	Total			95.2%
Age in years
Age in years	Minimum	Maximum	Mean	Standard Deviation
Age in years	17	39	23,98	± 5,06
Weight
Weight in kilograms	Minimum	Maximum	Mean	Standard Deviation
Weight in kilograms	51	78	60.23	± 6.84
Height in meters
Height in meters/centimeters	Minimum	Maximum	Mean	Standard Deviation
Height in meters/centimeters	1.46	1.70	1.58	± 0.05
Ethnicity/Color
			Percentage
	White			52.4%
	Brown			47.6%
	Total			100%
Embedding degrees of Pell and Gregory
	Frequency		Percentage
IA	17		40.5%
IB	3		7.1%
IIA	12		28.6%
IIB	6		14.3%
IIC	4		9.5%
Total	42		100%

Surgery time
Groups	Mean	Standard deviation	p-value
IA	30.71	18.45	0.419
IB	18.67	0.57
IIA	33.00	19.89
IIB	33.67	3.38
IIC	30.50	0.57

Quantity of used Anesthetic tubes
Groups	Mean	Standard deviation	p-value
IA	1.94	0.52	0.939
IB	1.76	0.40
IIA	2.00	0.60
IIB	1.83	0.68
IIC	2.25	0.86

Need for osteotomy
Groups	Mean	Standard deviation	p-value
IA	1.65	0.78	0.428
IB	1.67	0.57
IIA	1.50	0.79
IIB	2.00	0.00
IIC	2.00	0.00

Need for odontosection
Groups	Need for odontosection	Frequency	p-value
IA IA IB IB	Yes No Yes No	2 15 2 1	0.159^* * p-value was less than 0.05.
IA IA IIA IIA	Yes No Yes No	2 15 8 4	0.008^* * p-value was less than 0.05.
IA IA IIB IIB	Yes No Yes No	2 15 2 4	0.567^* * p-value was less than 0.05.
IA IA IIC IIC	Yes No Yes No	2 15 2 2	0.296^* * p-value was less than 0.05.
IB IB IIA IIA	Yes No Yes No	2 1 8 4	1.000^* * p-value was less than 0.05.
IB IB IIB IIB	Yes No Yes No	2 1 2 4	0.813^* * p-value was less than 0.05.
IB IB IIC IIC	Yes No Yes No	2 1 2 2	1.000^* * p-value was less than 0.05.
IIA IIA IIB IIB	Yes No Yes No	8 4 2 4	0.402^* * p-value was less than 0.05.
IIA IIA IIC IIC	Yes No Yes No	8 4 2 2	1.000^* * p-value was less than 0.05.
IIB IIB IIC IIC	Yes No Yes No	2 4 2 2	1.000^* * p-value was less than 0.05.

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[1] Correspondence to: EF SOUZA JUNIOR. E-mail: erasmo_jn@hotmail.com.