A retrospective study on the prognostic factors and success, survival, and failure outcomes of treated endodontic-periodontal lesions

OBJECTIVES

The objective of this retrospective study was to determine possible prognostic factors of endodontic-periodontal lesions and to compare success, survival, and failure outcomes of treated endodontic-periodontal lesions across different treatment modalities, demographic variables, and anatomical tooth variations.

MATERIALS AND METHODS

Data was collected from patient records in the patient management system (Salud, Titanium Solutions) from the Griffith University Dental Clinic between January 2008 and December 2021. The search strategy used the terms "endodontic periodontal lesion," "periodontal endodontic lesion," "endo perio lesion," "perio endo lesion," and "EPL." The 88 cases which met inclusion and exclusion criteria were analyzed.

RESULTS

The overall success rate was 46.6%, with 21.6% of teeth surviving and 31.8% of teeth failing. Bone loss extending to the apical third (OR = 0.3, 95% CI [0.104, 0.866]), and probing depths of 5-7 mm (OR = 0.147, 95% CI [0.034, 0.633]) and 8-10 mm (OR = 0.126, 95% CI [0.029, 0.542]) were associated with a statistically significant lower odds of success (p < .05). A history of no periodontal disease (OR = 7.705, 95% CI [1.603, 37.037]) was associated with a statistically significant higher odds of success (p < .05).

CONCLUSION

Practitioners should be aware of bone loss to the apical third, deep probing depths, and a history of periodontal disease as possible prognostic factors that can affect the success rate when treating endodontic-periodontal lesions. Further research with more stringent control over operator factors should be done to investigate these variables.

Cloning and characterization of a novel human olfactory UDP-glucuronosyltransferase

Xenobiotic metabolizing enzymes in the olfactory epithelium have been suggested to catalyse inactivation and facilitate elimination of odorants. We report here the molecular cloning and functional characterization of a human olfactory UDP-glucuronosyltransferase (UGT). The cloned protein is composed of 527 amino acids with an identity of 87% with a rat olfactory UGT and of 43-62% with other human UGT isoforms. Based on the sequence homology, it has been designated hUGT2A1. The gene was mapped to chromosome 4q13 by fluorescence in situ hybridization. The expression appeared to be specific for the olfactory tissue. The substrate specificity of this isoform was assessed using Chinese hamster V79 cells stably transfected with the isolated cDNA. The expressed enzyme showed a broad substrate spectrum including a range of phenolic compounds as well as aliphatic and monoterpenoid alcohols, among them many odorants. Furthermore, some steroids, especially androgens, some drugs and carcinogens were conjugated. The results support a role of the enzyme in olfactory perception and in protection of the neural system against airborne hazardous chemicals.

Saliva contamination and resin bonding of etched metal retainers

This study was performed to determine how preapplication of unfilled resin and subsequent saliva contamination would affect the shear strength of the etched-metal resin-bonded retainer. There was no significant difference in the shear strength of the metal-resin bond among experimental groups when the metal retainer was bonded in the routine manner, when unfilled resin was applied and allowed to polymerize before bonding of filled resin, or when saliva contamination occurred before the addition of filled resin. Preapplication of unfilled resin to etched metal retainers may serve as a means of protecting the etched metal surface for routine try-in of "Maryland bridges" before final cementation.