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Residual periodontal defects distal to the mandibular second molar 6-36 months after impacted third molar extraction.
J Clin Periodontol 2002; 29(11):1004-11JC

Abstract

AIM

This retrospective study investigated the periodontal conditions distal to mandibular second molars 6-36 months after routine surgical extraction of adjacent impacted third molars.

METHOD

Subjects were randomly selected by systematic sampling from computer records of 3211 surgical mandibular third molar extractions in the Hong Kong dental teaching hospital. Records and pre-extraction radiographs of the selected cases were retrieved. Selected subjects (n = 283) were invited for an interview followed by a clinical examination. Community Periodontal Index (CPI) protocol was used for the assessment of the general periodontal status (excluding the mandibular second molar of interest, i.e. the subject tooth) followed by a detailed periodontal examination of the subject tooth.

RESULTS

In all, 158 subjects, aged 29 +/- 7 years, were examined with only 6% (nine subjects) having a highest CPI score of 4 (excluding the subject tooth), but local periodontal defects were prevalent at the distal surface of subject mandibular second molars: mean probing pocket depth (PPD) was 5.4 +/- 1.9 mm with 67% (106 subjects) exhibiting PPD >or= 5 mm and 23% (36 subjects) exhibiting PPD >or= 7 mm; mean recession was 0.8 +/- 1.0 mm; bleeding on probing 96% and suppuration on probing 5%. Multiple linear regression analysis was used to analyse the effects of 12 independent variables on the PPD at the distal surface of the involved mandibular second molar. Three possible risk indicators (P < 0.001, R2 = 0.27) associated with localised increased PPD at the distal surface of the mandibular second molars were identified: 1) third molar 'mesio-angular' impaction; 2) pre-extraction crestal radiolucency and 3) inadequate post-extraction local plaque control.

CONCLUSION

The results suggest that periodontal breakdown initiated and established on the distal surface of a mandibular second molar in the vicinity of a 'mesio-angular' impacted third molar evidenced by pre-extraction crestal radiolucency in association with inadequate plaque control after extraction can predispose to a persistent localised periodontal problem.

Authors+Show Affiliations

Faculty of Dentistry, The University of Hong Kong, Hong Kong SAR, China.No affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article

Language

eng

PubMed ID

12472993

Citation

Kan, Kwok Wing, et al. "Residual Periodontal Defects Distal to the Mandibular Second Molar 6-36 Months After Impacted Third Molar Extraction." Journal of Clinical Periodontology, vol. 29, no. 11, 2002, pp. 1004-11.
Kan KW, Liu JK, Lo EC, et al. Residual periodontal defects distal to the mandibular second molar 6-36 months after impacted third molar extraction. J Clin Periodontol. 2002;29(11):1004-11.
Kan, K. W., Liu, J. K., Lo, E. C., Corbet, E. F., & Leung, W. K. (2002). Residual periodontal defects distal to the mandibular second molar 6-36 months after impacted third molar extraction. Journal of Clinical Periodontology, 29(11), pp. 1004-11.
Kan KW, et al. Residual Periodontal Defects Distal to the Mandibular Second Molar 6-36 Months After Impacted Third Molar Extraction. J Clin Periodontol. 2002;29(11):1004-11. PubMed PMID: 12472993.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Residual periodontal defects distal to the mandibular second molar 6-36 months after impacted third molar extraction. AU - Kan,Kwok Wing, AU - Liu,Jerry K S, AU - Lo,Edward C M, AU - Corbet,Esmonde F, AU - Leung,W Keung, PY - 2002/12/11/pubmed PY - 2003/3/22/medline PY - 2002/12/11/entrez SP - 1004 EP - 11 JF - Journal of clinical periodontology JO - J. Clin. Periodontol. VL - 29 IS - 11 N2 - AIM: This retrospective study investigated the periodontal conditions distal to mandibular second molars 6-36 months after routine surgical extraction of adjacent impacted third molars. METHOD: Subjects were randomly selected by systematic sampling from computer records of 3211 surgical mandibular third molar extractions in the Hong Kong dental teaching hospital. Records and pre-extraction radiographs of the selected cases were retrieved. Selected subjects (n = 283) were invited for an interview followed by a clinical examination. Community Periodontal Index (CPI) protocol was used for the assessment of the general periodontal status (excluding the mandibular second molar of interest, i.e. the subject tooth) followed by a detailed periodontal examination of the subject tooth. RESULTS: In all, 158 subjects, aged 29 +/- 7 years, were examined with only 6% (nine subjects) having a highest CPI score of 4 (excluding the subject tooth), but local periodontal defects were prevalent at the distal surface of subject mandibular second molars: mean probing pocket depth (PPD) was 5.4 +/- 1.9 mm with 67% (106 subjects) exhibiting PPD >or= 5 mm and 23% (36 subjects) exhibiting PPD >or= 7 mm; mean recession was 0.8 +/- 1.0 mm; bleeding on probing 96% and suppuration on probing 5%. Multiple linear regression analysis was used to analyse the effects of 12 independent variables on the PPD at the distal surface of the involved mandibular second molar. Three possible risk indicators (P < 0.001, R2 = 0.27) associated with localised increased PPD at the distal surface of the mandibular second molars were identified: 1) third molar 'mesio-angular' impaction; 2) pre-extraction crestal radiolucency and 3) inadequate post-extraction local plaque control. CONCLUSION: The results suggest that periodontal breakdown initiated and established on the distal surface of a mandibular second molar in the vicinity of a 'mesio-angular' impacted third molar evidenced by pre-extraction crestal radiolucency in association with inadequate plaque control after extraction can predispose to a persistent localised periodontal problem. SN - 0303-6979 UR - https://www.unboundmedicine.com/medline/citation/12472993/Residual_periodontal_defects_distal_to_the_mandibular_second_molar_6_36_months_after_impacted_third_molar_extraction_ L2 - https://onlinelibrary.wiley.com/resolve/openurl?genre=article&amp;sid=nlm:pubmed&amp;issn=0303-6979&amp;date=2002&amp;volume=29&amp;issue=11&amp;spage=1004 DB - PRIME DP - Unbound Medicine ER -