1、Preventive resin restorationPreventive resin restorationDefinition remove caries lesions in the pit and fissures only, use acid-etch technique and resin to repair early caries in the pits and seal the occlusal surface; a combination of sealant and restoration. Indications of PRRProbe get stuck with

2、caries lesions in pit and fissures Deep pit and fissures likely to have dental cariesEarly caries in pit and fissures, muddy or chalky enamelNo proximal caries lesionClassificationsA: the smallest round bur to remove demineralized enamel, restoration with sealant B:small or medium sized round bur to

3、 remove caries lesions, restoration with dilute resinC:medium or big round bur to remove caries lesions extending into dentine, use bases to protect pulp, enamel or dentine bonding, fill with composite resin for posterior teethProcedures Remove caries lesions in pit and fissures with hand piece, the

4、 size of the round bur is decided by the caries lesion and no extention needed.Procedures Cleaning teeth surfaces thoroughly, drying and moisture controlProcedures calcium hydroxide liner on exposed dentine for type CProcedures Acid etch of occlusal surfaces and cavitiesProcedures Type C: Composite

5、resin for posterior teeth after enamel bonding ；Type B: dilute resin or sealant with fillers；Type A: sealant on the occlusal surfaces and cavities only.Procedures Checking the restorationsProcedures Checking the restorationsOpinions about PRRDent Clin North Am. 2005 Oct;49(4):815-23, vii.Preventive

6、resin restorations and sealants in light of current evidence.Pit and fissure sealant should be treatment option provided to all children, particularly at the age immediately after eruption of the posterior teeth and especially, but not exclusively, the permanent teeth. Opinions about PRROpinions abo

7、ut PRRPreventive resin restoration is minimally invasive procedure that should be the treatment of choice for small carious lesions in the posterior teeth. The Class I amalgam should not be placed as a first-time restorative material to treat incipient or small carious lesions under any circumstance

8、s. The amount of tooth structure removal necessary for Class I Black preparation, which requires sufficient depth of amalgam and extension for prevention, is an unacceptable treatment when minimally-invasive options are available.Opinions about PRRJ Investig Clin Dent. 2012 Feb 8. Minimal interventi

9、on concept: a new paradigm for operative dentistry.The current treatment philosophy is to prevent and detect dental disease at the earliest stage in order to avoid invasive treatment. With the current understanding of the nature of dental disease and its process, the treatment philosophy is now chan

10、ging to a more conservative approach and the concept of minimal intervention is gaining popularity in modern dentistry throughout the world. Opinions about PRR It is now established that demineralized but non-cavitated enamel and dentine can be healed and traditional surgical approach of drilling an

11、d filling may no longer be necessary as this only treats the symptoms of the disease and not the cause. However, when surgical intervention is indicated, the least invasive techniques such as preventive resin restoration and minimal cavity preparation are utilized. Evidence-based Update of Pediatric

12、 Dental Restorative Procedures: Preventive Strategies.J Clin Pediatr Dent. 2015 ;39(3):193-7. There has been significant advances in the understanding of preventive restorative procedures regarding the advantages and disadvantages for restorative procedures; the evidence for conservative techniques for deep carious lesions; the effectiveness of pit and fissure sealants; and the evidence for use of resin infiltration techn