Mandibular third molar to the adjacent second molar cariogenic effect
[Keywords:] the second molar; dental caries; Analysis
Wisdom is the last eruption of teeth in the mouth, up and down about the one (there is congenital absence of the case),
the eruption age of about 18 to 25 years old, and often leads to pericoronitis space infection requiring removal, no clinical symptoms of many Wisdom teeth can cause adjacent second molar distal proximal caries situation, particularly in
the lower jaw serious, often eventually leading to the mandibular second molar adjacent to the common wisdom teeth and the absence of wisdom teeth on the adjacent article on the second mandibular molars induced caries is analyzed.
1 Materials and Methods
1.1 Clinical Data for 2006 selected cases from 6 months to June 2007 in our hospital had taken oral panoramic radiographs of patients, a total of 105 patients, aged 19 to 51 years, mean age 32.5 years, male 64 cases, female 41 cases, the number of mandibular third molar eruption was 151, the exclusion of other oral diseases, dental maxillofacial deformities and genetic diseases of bone and other factors that can affect the study.
1.2 Methods of selected cases the type of mandibular impacted wisdom teeth (near the horizontal, vertical and other impaction types) and the situation caused by the adjacent second molar caries classification and tabulation of data collected after statistically analysis and processing.
Cases of mandibular impacted wisdom teeth caused by the adjacent second molar caries situation in Table 1. Table 1, the type of mandibular impacted wisdom teeth on the adjacent
teeth of cariogenic
Mandibular impacted wisdom teeth at the angle classification statistics, the chi-square test, different types of mandibular impacted wisdom teeth were significantly (P <0.05); the adjacent second molar caries situation caused by the Chi-
square test, significant differences (P <0.05), in this group of mandibular wisdom teeth caused by the adjacent second molar
caries was 43.0%.
Wisdom with modern medicine and the gradual degradation of human evolution, often congenital absence or dislocation of eruption. Because of its large variation teeth, eruption time and location are unique, often caused by a variety of complications, which in the eruption process and After the eruption of adjacent teeth caused some decay is more common complication of tooth decay caused by neighbors after the final treatment for most of the wisdom tooth removal are
required will correspond to, or even the same time can cause adjacent teeth need extraction.
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As early as 1971 Laskin  have proposed prophylactic removal of mandibular wisdom teeth should be to avoid a
variety of related complications, according to statistics literature prophylactic removal rate reached 62.2% , and Osborn  such as removal of wisdom teeth conducted after the occurrence of complications, the results show that the
complications (dry socket, infection, nerve damage, etc.) is closely related with age, older persons with high complications, they also proposed to be removed before the age of 20 mandibular wisdom teeth, to reduce the incidence of complications.
Therefore I suggest to persons over the age of wisdom teeth of 18 cases, 1 or 2 times annual health survey, panoramic film for oral examination, clinical examination and patient's age, can be integrated to determine whether the normal eruption, the eruption does not work if the estimate is prophylactic removal should be considered; eruption of wisdom teeth have been exceptions, such as location, easy to cause the adjacent second molar caries, should also be conducted as soon as
possible preventive or therapeutic removal.
[References]  Laskin DM. Evaluation of the third molar problem Jam Dent Assoc [J] .1971,82:824 ~ 828.  Alling CC, Catine GA.Management of impacted teeth [J]. J Oral Maxillofac Surg, 1993,51 (Suppl): 3.  Osborn TP, Frederickson G, Small TA, et al.A prospective study of complications related to mandibular third molar surgery [J]. J Oral Maxillofac Surg, 1985,43:767
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