Shear's Cysts of the Oral and Maxillofacial Regions. Paul M. Speight

with impacted teeth from 390 patients. The most common diagnosis was dentigerous cyst (56.5% of lesions; n = 230), followed by odontogenic keratocyst (6.1%) and then paradental cyst (5.7%; n = 23).

It is interesting that these figures contrast starkly with data from other studies that have shown that paradental cysts are exceedingly rare or are not diagnosed at all. Six of the studies shown in Table 4.1 did not record any inflammatory collateral cysts. Costa et al. (2014 ) also reviewed 11 studies that reported histological findings associated with third molars in 8464 patients. The most common finding was of normal dental follicle (76%), but the most common lesions were dentigerous cysts, found in 410 cases (11%). Only one paper (Al‐Khateeb and Bataineb 2006 ) reported finding any paradental cysts and there were only 2, suggesting an overall prevalence of 0.05%. In a systematic review of the prevalence of odontogenic cysts and tumours associated with impacted third molars, Mello et al. (2019 ) reviewed 16 studies reporting histological diagnoses associated with more than 50 000 teeth. There were 1371 cysts, of which 783 (57.1%) were dentigerous cysts, 400 (29.2%) radicular cysts, and 150 (10.9%) odontogenic keratocysts. These authors also found the same single study (Al‐Khateeb and Bataineb 2006 ) that had reported only 2 paradental cysts. These data are similar to other studies that have examined tissues associated with impacted third molars and have not reported a single paradental cyst (e.g. Curran et al. 2002 [USA]; Stathopoulos et al. 2011 [Greece]; Patil et al. 2014 [India]).

Table 4.2 Paradental cysts. Age, sex, and site distribution from selected reports, and from the review of 222 cases by Philipsen et al. (2004 ).

References	n	Mean agea	Age range	Male (%)	% Bilateral
Craig (1976 )	48	3rd decade	NR	83.0	2.1
Ackermann et al. (1987 )	50	3rd decade	17–62	70.0	6.0
Vedtofte and Praetorius (1989 )	15	24.4	18–34	60.0	0.0
de Sousa et al. (2001 )	54b	3rd decade	13–47	39.0	NR
Colgan et al. (2002 )	15	27.4	18–43	46.6	6.6
Jones et al. (2006 )	376	29.6	17–74	57.3	NR
Philipsen et al. (2004 )	11	29.9	18–46	63.6	18.0
Tamiolakis et al. (2019 )	53	29.3	18–56	52.8	NR
Mohammed et al. (2019 )	23	30.2	11–51	69.5	NR
Philipsen et al. (2004 )	222c	27.6	18–47	70.6	4.1

      n, number of patients; NR, not reported.

      ^a In some reports, the mean age is not given, so the peak decade is included.

      ^b Includes three cases on first or second molars.

      ^c Total cases reviewed, n for each parameter varies.

Table 4.3 Mandibular buccal bifurcation cysts. Age, sex, and site distribution from selected reports, and from the review of 110 cases by Philipsen et al. (2004 ) (see text for discussion).

References				First molars	Second molars
	n	% Male	% Bilateral	n	Mean age	Age range	n	Mean age	Age range
Vedtofte and Praetorius (1989 )	12	33.3	16.6	5	8.0	7–9	7	13.3	11–15
Wolf and Hietanen (1990 )	6	16.6	NR	3	7.3	6–9	3	13.0	12–14
Thurnwald et al. (1994 )	10	70.0	40.0	10	7.7	5–9	–	–	–
Pompura et al. (1997 )	32	43.7	37.5	32	7.5	5–11	–	–	–
Philipsen et al. (2004 )	110a	55.2	23.9	36	8.7	Скачать книгу В начало < 36 37 38 39 40 41 42 43 44 45 > В конец