title: Factors influencing pulpal response to cavity restorations.
abstract: OBJECTIVE
  The purposes of this retrospective work were: (1) to determine the relative importance of bacteria on cavity walls, remaining dentin thickness and post-operative time on pulpal inflammation after cavity restoration; (2) to compare the respective influences of bacterial microleakage and the restorative material itself on pulp reaction severity.
  
  
  METHODS
  317 class V cavities, in human bicuspids scheduled for extraction for orthodontic reasons were used for this study. Nine different materials were included. The severity of the pulpal reaction was ranked on hematoxylin/eosin stained sections according to FDI standards. The further parameters recorded were: (1) the presence or absence of bacteria on the cavity walls was noted on Brown and Brenn stained sections; (2) the remaining dentin thickness was measured and the teeth classified into three groups (< 500, 500-1000, > 1000 microns); and (3) the post-operative delay before extraction was recorded and classified as short time (< 5 weeks) or long time (> 5 weeks). Three two-way analyses of variance (ANOVA) followed by Kruskall and Wallis tests evaluated the influence of the three parameters on pulpal reaction severity. The third ANOVA also compared pulpal reactions under the different materials when the teeth were pooled, on bacteria free teeth and on bacteria contaminated teeth.
  
  
  RESULTS
  The first ANOVA ranked by decreasing order of importance: the presence of bacteria (p < 0.0001), the remaining dentin thickness (p = 0.02) and the post-operative delay (p = 0.04). The second ANOVA showed no difference among the restorative materials when bacteria were present on the cavity walls.
  
  
  CONCLUSIONS
  The presence of bacteria on the cavity walls is the main factor influencing pulpal reaction under restorative materials, but does not account for 100% of the cases.
authors.affiliation: Laboratoire IMEB, UFR Odontologie, Marseille, France. jcamps2035@aol.com
authors.forename: J
authors.initials: J
authors.lastname: Camps
authors.forename: J
authors.initials: J
authors.lastname: Déjou
authors.forename: M
authors.initials: M
authors.lastname: Rémusat
authors.forename: I
authors.initials: I
authors.lastname: About
mesh_terms: D000293:Adolescent; D000704:Analysis of Variance; D002648:Child; D003737:Dental Cavity Preparation / Q000009:adverse effects*; D003763:Dental Leakage / Q000150:complications* / Q000382:microbiology; D003764:Dental Materials / Q000009:adverse effects; D003789:Dental Pulp Exposure / Q000150:complications / Q000209:etiology; D003793:Dental Restoration, Permanent / Q000009:adverse effects* / Q000379:methods; D003804:Dentin / Q000033:anatomy & histology; D006801:Humans; D011671:Pulpitis / Q000209:etiology*; D012189:Retrospective Studies; D018709:Statistics, Nonparametric; D013997:Time Factors
chemical_list: D003764:Dental Materials