On yоur new pаtient yоu аre using the light, explоrers аnd radiographic images to determine where there are restorations, check the restorations for areas of decay and to determine where there is calculus to remove. On tooth #30 there is an area where there is a gap between the tooth and the amalgam that you can stick the explorer in. On tooth #18, there is excessive amalgam material that extends into the proximal embrasure space. You feel vibrations that indicate that there is calculus on many of proximal surfaces, you estimate about 25% of the surfaces total. One of the patient's chief complaints for today is that his bridge fell out and he brought it with him in hopes it could be re-cemented. QUESTION: According to what is seen in this photo, what teeth make up his fixed partial denture and which tooth/teeth is/are the pontic(s)--(notice the reflection underneath to see inside the crowns)?