title: Evidence summary: which dental liners under amalgam restorations are more effective in reducing postoperative sensitivity?
abstract: Since August 2009, members of the Primary Care Dentistry Research Forum (www.dentistryresearch.org) have taken part in an online vote to identify questions in day-to-day practice that they felt most needed to be answered with conclusive research. The question that receives the most votes each month forms the subject of a critical appraisal of the relevant literature. Each month a new round of voting takes place to decide which further questions will be reviewed. Dental practitioners and dental care professionals are encouraged to take part in the voting and submit their own questions to be included in the vote by joining the website. The paper below details a summary of the findings of the ninth critical appraisal. In order to address the question raised by dentistry research forum, first a search was conducted for systematic reviews on the topic. There was one systematic review retrieved comparing bonded amalgam restorations versus non-bonded amalgam restorations. However, there was no other systematic review identified assessing the effectiveness of dental liners under amalgam restorations in general. Therefore, a search was conducted for any randomised controlled trial (RCT) comparing use of a lining under amalgam restorations versus no lining or RCTs comparing differing lining materials under amalgam against each other. There were eight relevant RCTs identified. Due to the low quality, small sample sizes or lack of adequate reporting of the outcome data, the evidence is inadequate to claim or refute a difference in postoperative sensitivity between different dental liners. Further well-conducted RCTs are needed to answer this question. These RCTs would be preferably included and synthesised in a systematic review.
authors.affiliation: Evidence Based Dentistry, Peninsula Dental School. zelma.powell@bda.org
authors.forename: Mona
authors.initials: M
authors.lastname: Nasser
mesh_terms: D002126:Calcium Hydroxide; D003188:Composite Resins; D003723:Dental Amalgam / Q000009:adverse effects*; D001840:Dental Bonding; D003736:Dental Cavity Lining; D003793:Dental Restoration, Permanent / Q000379:methods*; D057133:Dentin Desensitizing Agents; D003807:Dentin Sensitivity / Q000139:chemically induced / Q000517:prevention & control*; D055094:Evidence-Based Dentistry; D005899:Glass Ionomer Cements; D006801:Humans; D016032:Randomized Controlled Trials as Topic; D012116:Resins, Plant; D012196:Review Literature as Topic
chemical_list: D003188:Composite Resins; D057133:Dentin Desensitizing Agents; D005899:Glass Ionomer Cements; D012116:Resins, Plant; C470434:copaliner dentin varnish and sealant; D003723:Dental Amalgam; D002126:Calcium Hydroxide