Evidence Hub

A Case-Control Comparison of Salivary pH, Dental and Periodontal Health, and Bacterial Counts of Porphyromonas gingivalis and Streptococcus mutans in Patients With Systemic Lupus Erythematosus

Hamidreza Bashiri, Fahimeh Rashidi Maybodi, Hamid Heidari, Faezeh Sadeghi Haris, Nazanin Roqani Dehkordi

Special Care in Dentistry: managing special patients, settings, and situations, 2026

20 participants

Abstract

BACKGROUND

Patients with systemic lupus erythematosus (SLE) may exhibit increased oral health vulnerabilities. This study aimed to compare salivary pH, dental and periodontal health, and salivary Streptococcus mutans and Porphyromonas gingivalis counts between SLE patients and healthy controls.

MATERIALS AND METHODS

A case-control study included 20 SLE patients and 20 healthy controls matched for age, sex, socioeconomic status, and geographic region. All SLE patients had at least one year since diagnosis and met the Lupus Low Disease Activity State (LLDAS) definition (SLEDAI ≤4, no major organ activity, PGA ≤1, prednisone ≤7.5 mg/day, and no recent flare). Medication profiles were not systematically recorded, although patients maintained standard-of-care therapies as per their rheumatologists' prescriptions. Participants brushed at least once daily; smokers and individuals with xerostomia were excluded. Dental (DMFT) and periodontal (GBI, CAL) indices and plaque index were assessed. Unstimulated saliva was collected to measure pH and quantify S. mutans and P. gingivalis counts using PCR.

RESULTS

No significant differences were observed in overall DMFT, decayed or filled teeth, GBI, CAL, or P. gingivalis counts (p > 0.05). Within the limits of the sample size, SLE patients had a higher number of missing teeth and significantly increased S. mutans counts (p < 0.05). Salivary pH was significantly lower in the SLE group (p < 0.05).

CONCLUSION

Tooth loss in SLE may be related to…

How strong is the evidence?

Evidence Hub reads this as a case-control, done in people. Its evidence level is 4 of 5 (Low · observational). Observational designs can show an association but not prove cause. Reported size: 20 participants or records.

How the five levels of evidence work. The level is assigned automatically from the abstract and can be wrong, so check the paper.

Read the paper

Related studies

Go deeper in Evidence Hub

Evidence Hub adds a study data sheet (design, sample size, evidence level, key numbers), an AI summary and a chat grounded in the paper's text.

Open this study Sign up free